720 lines
25 KiB
PHP
720 lines
25 KiB
PHP
<?php
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// $Id$
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/**
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* @file
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* Functions for use with Drupal's AJAX framework.
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*/
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/**
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* @defgroup ajax AJAX framework
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* @{
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* Drupal's AJAX framework is used to dynamically update parts of a page's HTML
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* based on data from the server. Upon a specified event, such as a button
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* click, a callback function is triggered which performs server-side logic and
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* may return updated markup, which is then replaced on-the-fly with no page
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* refresh necessary.
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*
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* This framework creates a PHP macro language that allows the server to
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* instruct JavaScript to perform actions on the client browser. When using
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* forms, it can be used with the #ajax property.
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* The #ajax property can be used to bind events to the AJAX framework. By
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* default, #ajax uses 'system/ajax' as path, along with its defined page
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* callback. However, you may optionally specify a different path to request or
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* a different callback function to invoke, which can return updated HTML or can
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* also return a richer set of AJAX framework commands.
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*
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* @see @link ajax_commands AJAX framework commands @endlink
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*
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* To implement AJAX handling in a normal form, just add '#ajax' to the form
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* definition of a field. That field will trigger an AJAX event when it is
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* clicked (or changed, depending on the kind of field). #ajax supports
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* the following parameters (either 'path' or 'callback' is required at least):
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* - #ajax['path']: The menu path to use for the request. This path should map
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* to a menu page callback that returns data using ajax_render(). By default,
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* this is 'system/ajax'. Be warned that the default path currently only works
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* for buttons. It will not work for selects, textfields, or textareas.
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* - #ajax['callback']: The callback to invoke, which will receive a $form and
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* $form_state as arguments, and should return the HTML to replace. By
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* default, the page callback defined for the menu path 'system/ajax' is
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* triggered to handle the server side of the #ajax event.
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* - #ajax['wrapper']: The CSS ID of the AJAX area. The HTML returned from the
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* callback will replace whatever is currently in this wrapper. It is
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* important to ensure that this wrapper exists in the form. The wrapper is
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* usually created using #prefix and #suffix properties in the form.
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* - #ajax['effect']: The jQuery effect to use when placing the new HTML.
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* Defaults to no effect. Valid options are 'none', 'slide', or 'fade'.
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* - #ajax['speed']: The effect speed to use. Defaults to 'slow'. May be
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* 'slow', 'fast' or a number in milliseconds which represents the length
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* of time the effect should run.
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* - #ajax['event']: The JavaScript event to respond to. This is normally
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* selected automatically for the type of form widget being used, and
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* is only needed if you need to override the default behavior.
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* - #ajax['method']: The jQuery method to use to place the new HTML.
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* Defaults to 'replace'. May be: 'replace', 'append', 'prepend',
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* 'before', 'after', or 'html'. See the jQuery documentation for more
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* information on these methods.
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*
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* In addition to using Form API for doing in-form modification, AJAX may be
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* enabled by adding classes to buttons and links. By adding the 'use-ajax'
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* class to a link, the link will be loaded via an AJAX call. When using this
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* method, the href of the link can contain '/nojs/' as part of the path. When
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* the AJAX framework makes the request, it will convert this to '/ajax/'.
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* The server is then able to easily tell if this request was made through an
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* actual AJAX request or in a degraded state, and respond appropriately.
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*
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* Similarly, submit buttons can be given the class 'use-ajax-submit'. The
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* form will then be submitted via AJAX to the path specified in the #action.
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* Like the ajax-submit class above, this path will have '/nojs/' replaced with
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* '/ajax/' so that the submit handler can tell if the form was submitted
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* in a degraded state or not.
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*
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* When responding to AJAX requests, the server should do what it needs to do
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* for that request, then create a commands array. This commands array will
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* be converted to a JSON object and returned to the client, which will then
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* iterate over the array and process it like a macro language.
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*
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* @see @link ajax_commands AJAX framework commands @endlink
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*
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* Each command is an object. $object->command is the type of command and will
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* be used to find the method (it will correlate directly to a method in
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* the Drupal.ajax[command] space). The object may contain any other data that
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* the command needs to process.
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*
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* Commands are usually created with a couple of helper functions, so they
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* look like this:
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*
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* @code
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* $commands = array();
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* // Replace the content of '#object-1' on the page with 'some html here'.
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* $commands[] = ajax_command_replace('#object-1', 'some html here');
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* // Add a visual "changed" marker to the '#object-1' element.
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* $commands[] = ajax_command_changed('#object-1');
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* // Output new markup to the browser and end the request.
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* ajax_render($commands);
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* @endcode
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*/
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/**
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* Render a commands array into JSON and exit.
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*
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* Commands are immediately handed back to the AJAX requester. This function
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* will render and immediately exit.
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*
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* @param $commands
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* A list of macro commands generated by the use of ajax_command_*()
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* functions.
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* @param $header
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* If set to FALSE the 'text/javascript' header used by drupal_json() will
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* not be used, which is necessary when using an IFRAME. If set to
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* 'multipart' the output will be wrapped in a textarea, which can also be
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* used as an alternative method when uploading files.
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*/
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function ajax_render($commands = array(), $header = TRUE) {
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// Automatically extract any 'settings' added via drupal_add_js() and make
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// them the first command.
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$scripts = drupal_add_js(NULL, NULL);
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if (!empty($scripts['settings'])) {
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array_unshift($commands, ajax_command_settings($scripts['settings']['data']));
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}
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// Allow modules to alter any AJAX response.
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drupal_alter('ajax_render', $commands);
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// Use === here so that bool TRUE doesn't match 'multipart'.
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if ($header === 'multipart') {
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// We do not use drupal_json() here because the header is not true. We are
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// not really returning JSON, strictly-speaking, but rather JSON content
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// wrapped in a textarea as per the "file uploads" example here:
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// http://malsup.com/jquery/form/#code-samples
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print '<textarea>' . drupal_to_js($commands) . '</textarea>';
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}
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else if ($header) {
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drupal_json($commands);
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}
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else {
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print drupal_to_js($commands);
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}
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exit;
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}
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/**
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* Send an error response back via AJAX and immediately exit.
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*
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* This function can be used to quickly create a command array with an error
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* string and send it, short-circuiting the error handling process.
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*
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* @param $error
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* A string to display in an alert.
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*/
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function ajax_render_error($error = '') {
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$commands = array();
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$commands[] = ajax_command_error(empty($error) ? t('An error occurred while handling the request: The server received invalid input.') : $error);
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ajax_render($commands);
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}
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/**
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* Get a form submitted via #ajax during an AJAX callback.
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*
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* This will load a form from the form cache used during AJAX operations. It
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* pulls the form info from $_POST.
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*
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* @return
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* An array containing the $form and $form_state. Use the list() function
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* to break these apart:
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* @code
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* list($form, $form_state, $form_id, $form_build_id) = ajax_get_form();
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* @endcode
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*/
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function ajax_get_form() {
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$form_state = form_state_defaults();
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$form_build_id = $_POST['form_build_id'];
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// Get the form from the cache.
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$form = form_get_cache($form_build_id, $form_state);
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if (!$form) {
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// If $form cannot be loaded from the cache, the form_build_id in $_POST
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// must be invalid, which means that someone performed a POST request onto
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// system/ajax without actually viewing the concerned form in the browser.
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// This is likely a hacking attempt as it never happens under normal
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// circumstances, so we just do nothing.
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watchdog('ajax', 'Invalid form POST data.', array(), WATCHDOG_WARNING);
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exit;
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}
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// Since some of the submit handlers are run, redirects need to be disabled.
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$form['#redirect'] = FALSE;
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// The form needs to be processed; prepare for that by setting a few internal
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// variables.
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$form_state['input'] = $_POST;
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$form_state['args'] = $form['#args'];
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$form_id = $form['#form_id'];
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return array($form, $form_state, $form_id, $form_build_id);
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}
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/**
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* Menu callback for AJAX callbacks through the #ajax['callback'] Form API property.
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*/
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function ajax_form_callback() {
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list($form, $form_state, $form_id, $form_build_id) = ajax_get_form();
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// Build, validate and if possible, submit the form.
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drupal_process_form($form_id, $form, $form_state);
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// This call recreates the form relying solely on the $form_state that
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// drupal_process_form() set up.
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$form = drupal_rebuild_form($form_id, $form_state, $form_build_id);
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// Get the callback function from the clicked button.
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$ajax = $form_state['clicked_button']['#ajax'];
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$callback = $ajax['callback'];
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if (drupal_function_exists($callback)) {
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$html = $callback($form, $form_state);
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// If the returned value is a string, assume it is HTML and create
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// a command object to return automatically.
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if (is_string($html)) {
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$commands = array();
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$commands[] = ajax_command_replace(NULL, $html);
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}
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// Otherwise, $html is supposed to be an array of commands, suitable for
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// Drupal.ajax, so we pass it on as is.
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else {
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$commands = $html;
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}
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ajax_render($commands);
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}
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// Return a 'do nothing' command if there was no callback.
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ajax_render(array());
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}
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/**
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* Add AJAX information about a form element to the page to communicate with JavaScript.
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*
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* If #ajax['path'] is set on an element, this additional JavaScript is added
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* to the page header to attach the AJAX behaviors. See ajax.js for more
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* information.
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*
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* @param $element
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* An associative array containing the properties of the element.
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* Properties used:
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* - #ajax['event']
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* - #ajax['path']
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* - #ajax['wrapper']
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* - #ajax['parameters']
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* - #ajax['effect']
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*
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* @return
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* None. Additional code is added to the header of the page using
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* drupal_add_js().
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*/
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function ajax_process_form($element) {
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$js_added = &drupal_static(__FUNCTION__, array());
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// Add a reasonable default event handler if none was specified.
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if (isset($element['#ajax']) && !isset($element['#ajax']['event'])) {
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switch ($element['#type']) {
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case 'submit':
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case 'button':
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case 'image_button':
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// Use the mousedown instead of the click event because form
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// submission via pressing the enter key triggers a click event on
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// submit inputs, inappropriately triggering AJAX behaviors.
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$element['#ajax']['event'] = 'mousedown';
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// Attach an additional event handler so that AJAX behaviors
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// can be triggered still via keyboard input.
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$element['#ajax']['keypress'] = TRUE;
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break;
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case 'password':
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case 'textfield':
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case 'textarea':
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$element['#ajax']['event'] = 'blur';
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break;
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case 'radio':
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case 'checkbox':
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case 'select':
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$element['#ajax']['event'] = 'change';
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break;
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default:
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return $element;
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}
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}
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// Adding the same JavaScript settings twice will cause a recursion error,
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// we avoid the problem by checking if the JavaScript has already been added.
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if (!isset($js_added[$element['#id']]) && (isset($element['#ajax']['callback']) || isset($element['#ajax']['path'])) && isset($element['#ajax']['event'])) {
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drupal_add_library('system', 'form');
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$element['#attached_js'] = array('misc/ajax.js');
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$ajax_binding = array(
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'url' => isset($element['#ajax']['callback']) ? url('system/ajax') : url($element['#ajax']['path']),
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'event' => $element['#ajax']['event'],
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'keypress' => empty($element['#ajax']['keypress']) ? NULL : $element['#ajax']['keypress'],
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'wrapper' => empty($element['#ajax']['wrapper']) ? NULL : $element['#ajax']['wrapper'],
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'selector' => empty($element['#ajax']['selector']) ? '#' . $element['#id'] : $element['#ajax']['selector'],
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'effect' => empty($element['#ajax']['effect']) ? 'none' : $element['#ajax']['effect'],
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'speed ' => empty($element['#ajax']['effect']) ? 'none' : $element['#ajax']['effect'],
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'method' => empty($element['#ajax']['method']) ? 'replace' : $element['#ajax']['method'],
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'progress' => empty($element['#ajax']['progress']) ? array('type' => 'throbber') : $element['#ajax']['progress'],
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'button' => isset($element['#executes_submit_callback']) ? array($element['#name'] => $element['#value']) : FALSE,
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);
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// Convert a simple #ajax['progress'] type string into an array.
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if (is_string($ajax_binding['progress'])) {
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$ajax_binding['progress'] = array('type' => $ajax_binding['progress']);
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}
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// Change progress path to a full URL.
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if (isset($ajax_binding['progress']['path'])) {
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$ajax_binding['progress']['url'] = url($ajax_binding['progress']['path']);
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}
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// Add progress.js if we're doing a bar display.
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if ($ajax_binding['progress']['type'] == 'bar') {
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drupal_add_js('misc/progress.js', array('cache' => FALSE));
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}
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drupal_add_js(array('ajax' => array($element['#id'] => $ajax_binding)), 'setting');
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$js_added[$element['#id']] = TRUE;
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$element['#cache'] = TRUE;
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}
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return $element;
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}
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/**
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* @} End of "defgroup ajax".
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*/
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/**
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* @defgroup ajax_commands AJAX framework commands
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* @{
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* @ingroup ajax
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*/
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/**
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* Creates a Drupal AJAX 'alert' command.
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*
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* The 'alert' command instructs the client to display a JavaScript alert
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* dialog box.
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*
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* This command is implemented by Drupal.ajax.prototype.commands.alert()
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* defined in misc/ajax.js.
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*
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* @param $text
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* The message string to dipslay to the user.
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*
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* @return
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* An array suitable for use with the ajax_render() function.
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*/
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function ajax_command_alert($text) {
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return array(
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'command' => 'alert',
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'text' => $text,
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);
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}
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/**
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* Creates a Drupal AJAX 'insert/replaceWith' command.
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*
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* The 'insert/replaceWith' command instructs the client to use jQuery's
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* replaceWith() method to replace each element matched matched by the given
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* selector with the given HTML.
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*
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* This command is implemented by Drupal.ajax.prototype.commands.insert()
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* defined in misc/ajax.js.
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*
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* @param $selector
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* A jQuery selector string. If the command is a response to a request from
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* an #ajax form element then this value can be NULL.
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* @param $html
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* The data to use with the jQuery replaceWith() method.
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* @param $settings
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* An optional array of settings that will be used for this command only.
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*
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* @return
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* An array suitable for use with the ajax_render() function.
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*
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* @see http://docs.jquery.com/Manipulation/replaceWith#content
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*/
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function ajax_command_replace($selector, $html, $settings = NULL) {
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return array(
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'command' => 'insert',
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'method' => 'replaceWith',
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'selector' => $selector,
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'data' => $html,
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'settings' => $settings,
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);
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}
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/**
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* Creates a Drupal AJAX 'insert/html' command.
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*
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* The 'insert/html' command instructs the client to use jQuery's html()
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* method to set the HTML content of each element matched by the given
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* selector while leaving the outer tags intact.
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*
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* This command is implemented by Drupal.ajax.prototype.commands.insert()
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* defined in misc/ajax.js.
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*
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* @param $selector
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* A jQuery selector string. If the command is a response to a request from
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* an #ajax form element then this value can be NULL.
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* @param $html
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* The data to use with the jQuery html() method.
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* @param $settings
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* An optional array of settings that will be used for this command only.
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*
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* @return
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* An array suitable for use with the ajax_render() function.
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*
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* @see http://docs.jquery.com/Attributes/html#val
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*/
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function ajax_command_html($selector, $html, $settings = NULL) {
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return array(
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'command' => 'insert',
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'method' => 'html',
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'selector' => $selector,
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'data' => $html,
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'settings' => $settings,
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);
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}
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/**
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* Creates a Drupal AJAX 'insert/prepend' command.
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*
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* The 'insert/prepend' command instructs the client to use jQuery's prepend()
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* method to prepend the given HTML content to the inside each element matched
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* by the given selector.
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*
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* This command is implemented by Drupal.ajax.prototype.commands.insert()
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* defined in misc/ajax.js.
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*
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* @param $selector
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* A jQuery selector string. If the command is a response to a request from
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* an #ajax form element then this value can be NULL.
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* @param $html
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* The data to use with the jQuery prepend() method.
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* @param $settings
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* An optional array of settings that will be used for this command only.
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*
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* @return
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* An array suitable for use with the ajax_render() function.
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*
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* @see http://docs.jquery.com/Manipulation/prepend#content
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*/
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function ajax_command_prepend($selector, $html, $settings = NULL) {
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return array(
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'command' => 'insert',
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'method' => 'prepend',
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'selector' => $selector,
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'data' => $html,
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'settings' => $settings,
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);
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}
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/**
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* Creates a Drupal AJAX 'insert/append' command.
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*
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* The 'insert/append' command instructs the client to use jQuery's append()
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* method to append the given HTML content to the inside each element matched
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* by the given selector.
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*
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* This command is implemented by Drupal.ajax.prototype.commands.insert()
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* defined in misc/ajax.js.
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*
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* @param $selector
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* A jQuery selector string. If the command is a response to a request from
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* an #ajax form element then this value can be NULL.
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* @param $html
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* The data to use with the jQuery append() method.
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* @param $settings
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* An optional array of settings that will be used for this command only.
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*
|
|
* @return
|
|
* An array suitable for use with the ajax_render() function.
|
|
*
|
|
* @see http://docs.jquery.com/Manipulation/append#content
|
|
*/
|
|
function ajax_command_append($selector, $html, $settings = NULL) {
|
|
return array(
|
|
'command' => 'insert',
|
|
'method' => 'append',
|
|
'selector' => $selector,
|
|
'data' => $html,
|
|
'settings' => $settings,
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Creates a Drupal AJAX 'insert/after' command.
|
|
*
|
|
* The 'insert/after' command instructs the client to use jQuery's after()
|
|
* method to insert the given HTML content after each element matched by
|
|
* the given selector.
|
|
*
|
|
* This command is implemented by Drupal.ajax.prototype.commands.insert()
|
|
* defined in misc/ajax.js.
|
|
*
|
|
* @param $selector
|
|
* A jQuery selector string. If the command is a response to a request from
|
|
* an #ajax form element then this value can be NULL.
|
|
* @param $html
|
|
* The data to use with the jQuery after() method.
|
|
* @param $settings
|
|
* An optional array of settings that will be used for this command only.
|
|
*
|
|
* @return
|
|
* An array suitable for use with the ajax_render() function.
|
|
*
|
|
* @see http://docs.jquery.com/Manipulation/after#content
|
|
*/
|
|
function ajax_command_after($selector, $html, $settings = NULL) {
|
|
return array(
|
|
'command' => 'insert',
|
|
'method' => 'after',
|
|
'selector' => $selector,
|
|
'data' => $html,
|
|
'settings' => $settings,
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Creates a Drupal AJAX 'insert/before' command.
|
|
*
|
|
* The 'insert/before' command instructs the client to use jQuery's before()
|
|
* method to insert the given HTML content before each of elements matched by
|
|
* the given selector.
|
|
*
|
|
* This command is implemented by Drupal.ajax.prototype.commands.insert()
|
|
* defined in misc/ajax.js.
|
|
*
|
|
* @param $selector
|
|
* A jQuery selector string. If the command is a response to a request from
|
|
* an #ajax form element then this value can be NULL.
|
|
* @param $html
|
|
* The data to use with the jQuery before() method.
|
|
* @param $settings
|
|
* An optional array of settings that will be used for this command only.
|
|
*
|
|
* @return
|
|
* An array suitable for use with the ajax_render() function.
|
|
*
|
|
* @see http://docs.jquery.com/Manipulation/before#content
|
|
*/
|
|
function ajax_command_before($selector, $html, $settings = NULL) {
|
|
return array(
|
|
'command' => 'insert',
|
|
'method' => 'before',
|
|
'selector' => $selector,
|
|
'data' => $html,
|
|
'settings' => $settings,
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Creates a Drupal AJAX 'remove' command.
|
|
*
|
|
* The 'remove' command instructs the client to use jQuery's remove() method
|
|
* to remove each of elements matched by the given selector, and everything
|
|
* within them.
|
|
*
|
|
* This command is implemented by Drupal.ajax.prototype.commands.remove()
|
|
* defined in misc/ajax.js.
|
|
*
|
|
* @param $selector
|
|
* A jQuery selector string. If the command is a response to a request from
|
|
* an #ajax form element then this value can be NULL.
|
|
*
|
|
* @return
|
|
* An array suitable for use with the ajax_render() function.
|
|
*
|
|
* @see http://docs.jquery.com/Manipulation/remove#expr
|
|
*/
|
|
function ajax_command_remove($selector) {
|
|
return array(
|
|
'command' => 'remove',
|
|
'selector' => $selector,
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Creates a Drupal AJAX 'changed' command.
|
|
*
|
|
* This command instructs the client to mark each of the elements matched by the
|
|
* given selector as 'ajax-changed'.
|
|
*
|
|
* This command is implemented by Drupal.ajax.prototype.commands.changed()
|
|
* defined in misc/ajax.js.
|
|
*
|
|
* @param $selector
|
|
* A jQuery selector string. If the command is a response to a request from
|
|
* an #ajax form element then this value can be NULL.
|
|
* @param $asterisk
|
|
* An optional CSS selector which must be inside $selector. If specified,
|
|
* an asterisk will be appended to the HTML inside the $asterisk selector.
|
|
*
|
|
* @return
|
|
* An array suitable for use with the ajax_render() function.
|
|
*/
|
|
function ajax_command_changed($selector, $asterisk = '') {
|
|
return array(
|
|
'command' => 'changed',
|
|
'selector' => $selector,
|
|
'star' => $asterisk,
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Creates a Drupal AJAX 'css' command.
|
|
*
|
|
* The 'css' command will instruct the client to use the jQuery css() method
|
|
* to apply the CSS arguments to elements matched by the given selector.
|
|
*
|
|
* This command is implemented by Drupal.ajax.prototype.commands.insert()
|
|
* defined in misc/ajax.js.
|
|
*
|
|
* @param $selector
|
|
* A jQuery selector string. If the command is a response to a request from
|
|
* an #ajax form element then this value can be NULL.
|
|
* @param $argument
|
|
* An array of key/value pairs to set in the CSS for the selector.
|
|
*
|
|
* @return
|
|
* An array suitable for use with the ajax_render() function.
|
|
*
|
|
* @see http://docs.jquery.com/CSS/css#properties
|
|
*/
|
|
function ajax_command_css($selector, $argument) {
|
|
return array(
|
|
'command' => 'css',
|
|
'selector' => $selector,
|
|
'argument' => $argument,
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Creates a Drupal AJAX 'settings' command.
|
|
*
|
|
* The 'settings' command instructs the client to extend Drupal.settings with
|
|
* the given array.
|
|
*
|
|
* This command is implemented by Drupal.ajax.prototype.commands.settings()
|
|
* defined in misc/ajax.js.
|
|
*
|
|
* @param $argument
|
|
* An array of key/value pairs to add to the settings. This will be utilized
|
|
* for all commands after this if they do not include their own settings
|
|
* array.
|
|
*
|
|
* @return
|
|
* An array suitable for use with the ajax_render() function.
|
|
*/
|
|
function ajax_command_settings($argument) {
|
|
return array(
|
|
'command' => 'settings',
|
|
'argument' => $argument,
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Creates a Drupal AJAX 'data' command.
|
|
*
|
|
* The 'data' command instructs the client to attach the name=value pair of
|
|
* data to the selector via jQuery's data cache.
|
|
*
|
|
* This command is implemented by Drupal.ajax.prototype.commands.data()
|
|
* defined in misc/ajax.js.
|
|
*
|
|
* @param $selector
|
|
* A jQuery selector string. If the command is a response to a request from
|
|
* an #ajax form element then this value can be NULL.
|
|
* @param $name
|
|
* The name or key (in the key value pair) of the data attached to this
|
|
* selector.
|
|
* @param $value
|
|
* The value of the data. Not just limited to strings can be any format.
|
|
*
|
|
* @return
|
|
* An array suitable for use with the ajax_render() function.
|
|
*
|
|
* @see http://docs.jquery.com/Core/data#namevalue
|
|
*/
|
|
function ajax_command_data($selector, $name, $value) {
|
|
return array(
|
|
'command' => 'data',
|
|
'selector' => $selector,
|
|
'name' => $name,
|
|
'value' => $value,
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Creates a Drupal AJAX 'restripe' command.
|
|
*
|
|
* The 'restripe' command instructs the client to restripe a table. This is
|
|
* usually used after a table has been modifed by a replace or append command.
|
|
*
|
|
* This command is implemented by Drupal.ajax.prototype.commands.restripe()
|
|
* defined in misc/ajax.js.
|
|
*
|
|
* @param $selector
|
|
* A jQuery selector string.
|
|
*
|
|
* @return
|
|
* An array suitable for use with the ajax_render() function.
|
|
*/
|
|
function ajax_command_restripe($selector) {
|
|
return array(
|
|
'command' => 'restripe',
|
|
'selector' => $selector,
|
|
);
|
|
}
|
|
|