drupal/misc/drupal.js

// $Id$

var Drupal = Drupal || { 'settings': {}, 'behaviors': {}, 'locale': {} };

// Allow other JavaScript libraries to use $.
jQuery.noConflict();

// Indicate when other scripts use $ with out wrapping their code.
if ($ === undefined) {
  $ = function () {
    alert('Please wrap your JavaScript code in (function ($) { ... })(jQuery); to be compatible. See http://docs.jquery.com/Using_jQuery_with_Other_Libraries.');
  };
}


(function ($) {

/**
 * Attach all registered behaviors to a page element.
 *
 * Behaviors are event-triggered actions that attach to page elements, enhancing
 * default non-Javascript UIs. Behaviors are registered in the Drupal.behaviors
 * object using the method 'attach' and optionally also 'detach' as follows:
 * @code
 *    Drupal.behaviors.behaviorName = {
 *      attach: function (context) {
 *        ...
 *      },
 *      detach: function (context) {
 *        ...
 *      }
 *    };
 * @endcode
 *
 * Drupal.attachBehaviors is added below to the jQuery ready event and so
 * runs on initial page load. Developers implementing AHAH/AJAX in their
 * solutions should also call this function after new page content has been
 * loaded, feeding in an element to be processed, in order to attach all
 * behaviors to the new content.
 *
 * Behaviors should use a class in the form behaviorName-processed to ensure
 * the behavior is attached only once to a given element. (Doing so enables
 * the reprocessing of given elements, which may be needed on occasion despite
 * the ability to limit behavior attachment to a particular element.)
 *
 * @param context
 *   An element to attach behaviors to. If none is given, the document element
 *   is used.
 * @param settings
 *   An object containing settings for the current context. If none given, the
 *   global Drupal.settings object is used.
 */
Drupal.attachBehaviors = function (context, settings) {
  context = context || document;
  settings = settings || Drupal.settings;
  // Execute all of them.
  $.each(Drupal.behaviors, function () {
    if ($.isFunction(this.attach)) {
      this.attach(context, settings);
    }
  });
};

/**
 * Detach registered behaviors from a page element.
 *
 * Developers implementing AHAH/AJAX in their solutions should call this
 * function before page content is about to be removed, feeding in an element
 * to be processed, in order to allow special behaviors to detach from the
 * content.
 *
 * Such implementations should look for the class name that was added in their
 * corresponding Drupal.behaviors.behaviorName.attach implementation, i.e.
 * behaviorName-processed, to ensure the behavior is detached only from
 * previously processed elements.
 *
 * @param context
 *   An element to detach behaviors from. If none is given, the document element
 *   is used.
 *
 * @see Drupal.attachBehaviors
 */
Drupal.detachBehaviors = function (context, settings) {
  context = context || document;
  settings = settings || Drupal.settings;
  // Execute all of them.
  $.each(Drupal.behaviors, function () {
    if ($.isFunction(this.detach)) {
      this.detach(context, settings);
    }
  });
};

/**
 * Encode special characters in a plain-text string for display as HTML.
 */
Drupal.checkPlain = function (str) {
  str = String(str);
  var replace = { '&': '&amp;', '"': '&quot;', '<': '&lt;', '>': '&gt;' };
  for (var character in replace) {
    var regex = new RegExp(character, 'g');
    str = str.replace(regex, replace[character]);
  }
  return str;
};

/**
 * Translate strings to the page language or a given language.
 *
 * See the documentation of the server-side t() function for further details.
 *
 * @param str
 *   A string containing the English string to translate.
 * @param args
 *   An object of replacements pairs to make after translation. Incidences
 *   of any key in this array are replaced with the corresponding value.
 *   Based on the first character of the key, the value is escaped and/or themed:
 *    - !variable: inserted as is
 *    - @variable: escape plain text to HTML (Drupal.checkPlain)
 *    - %variable: escape text and theme as a placeholder for user-submitted
 *      content (checkPlain + Drupal.theme('placeholder'))
 * @return
 *   The translated string.
 */
Drupal.t = function (str, args) {
  // Fetch the localized version of the string.
  if (Drupal.locale.strings && Drupal.locale.strings[str]) {
    str = Drupal.locale.strings[str];
  }

  if (args) {
    // Transform arguments before inserting them.
    for (var key in args) {
      switch (key.charAt(0)) {
        // Escaped only.
        case '@':
          args[key] = Drupal.checkPlain(args[key]);
        break;
        // Pass-through.
        case '!':
          break;
        // Escaped and placeholder.
        case '%':
        default:
          args[key] = Drupal.theme('placeholder', args[key]);
          break;
      }
      str = str.replace(key, args[key]);
    }
  }
  return str;
};

/**
 * Format a string containing a count of items.
 *
 * This function ensures that the string is pluralized correctly. Since Drupal.t() is
 * called by this function, make sure not to pass already-localized strings to it.
 *
 * See the documentation of the server-side format_plural() function for further details.
 *
 * @param count
 *   The item count to display.
 * @param singular
 *   The string for the singular case. Please make sure it is clear this is
 *   singular, to ease translation (e.g. use "1 new comment" instead of "1 new").
 *   Do not use @count in the singular string.
 * @param plural
 *   The string for the plural case. Please make sure it is clear this is plural,
 *   to ease translation. Use @count in place of the item count, as in "@count
 *   new comments".
 * @param args
 *   An object of replacements pairs to make after translation. Incidences
 *   of any key in this array are replaced with the corresponding value.
 *   Based on the first character of the key, the value is escaped and/or themed:
 *    - !variable: inserted as is
 *    - @variable: escape plain text to HTML (Drupal.checkPlain)
 *    - %variable: escape text and theme as a placeholder for user-submitted
 *      content (checkPlain + Drupal.theme('placeholder'))
 *   Note that you do not need to include @count in this array.
 *   This replacement is done automatically for the plural case.
 * @return
 *   A translated string.
 */
Drupal.formatPlural = function (count, singular, plural, args) {
  var args = args || {};
  args['@count'] = count;
  // Determine the index of the plural form.
  var index = Drupal.locale.pluralFormula ? Drupal.locale.pluralFormula(args['@count']) : ((args['@count'] == 1) ? 0 : 1);

  if (index == 0) {
    return Drupal.t(singular, args);
  }
  else if (index == 1) {
    return Drupal.t(plural, args);
  }
  else {
    args['@count[' + index + ']'] = args['@count'];
    delete args['@count'];
    return Drupal.t(plural.replace('@count', '@count[' + index + ']'));
  }
};

/**
 * Generate the themed representation of a Drupal object.
 *
 * All requests for themed output must go through this function. It examines
 * the request and routes it to the appropriate theme function. If the current
 * theme does not provide an override function, the generic theme function is
 * called.
 *
 * For example, to retrieve the HTML that is output by theme_placeholder(text),
 * call Drupal.theme('placeholder', text).
 *
 * @param func
 *   The name of the theme function to call.
 * @param ...
 *   Additional arguments to pass along to the theme function.
 * @return
 *   Any data the theme function returns. This could be a plain HTML string,
 *   but also a complex object.
 */
Drupal.theme = function (func) {
  for (var i = 1, args = []; i < arguments.length; i++) {
    args.push(arguments[i]);
  }

  return (Drupal.theme[func] || Drupal.theme.prototype[func]).apply(this, args);
};

/**
 * Parse a JSON response.
 *
 * The result is either the JSON object, or an object with 'status' 0 and 'data' an error message.
 */
Drupal.parseJson = function (data) {
  if ((data.substring(0, 1) != '{') && (data.substring(0, 1) != '[')) {
    return { status: 0, data: data.length ? data : Drupal.t('Unspecified error') };
  }
  return eval('(' + data + ');');
};

/**
 * Freeze the current body height (as minimum height). Used to prevent
 * unnecessary upwards scrolling when doing DOM manipulations.
 */
Drupal.freezeHeight = function () {
  Drupal.unfreezeHeight();
  $('<div id="freeze-height"></div>').css({
    position: 'absolute',
    top: '0px',
    left: '0px',
    width: '1px',
    height: $('body').css('height')
  }).appendTo('body');
};

/**
 * Unfreeze the body height.
 */
Drupal.unfreezeHeight = function () {
  $('#freeze-height').remove();
};

/**
 * Wrapper around encodeURIComponent() which avoids Apache quirks (equivalent of
 * drupal_encode_path() in PHP). This function should only be used on paths, not
 * on query string arguments.
 */
Drupal.encodePath = function (item, uri) {
  uri = uri || location.href;
  item = encodeURIComponent(item).replace(/%2F/g, '/');
  return (uri.indexOf('?q=') != -1) ? item : item.replace(/%26/g, '%2526').replace(/%23/g, '%2523').replace(/\/\//g, '/%252F');
};

/**
 * Get the text selection in a textarea.
 */
Drupal.getSelection = function (element) {
  if (typeof element.selectionStart != 'number' && document.selection) {
    // The current selection.
    var range1 = document.selection.createRange();
    var range2 = range1.duplicate();
    // Select all text.
    range2.moveToElementText(element);
    // Now move 'dummy' end point to end point of original range.
    range2.setEndPoint('EndToEnd', range1);
    // Now we can calculate start and end points.
    var start = range2.text.length - range1.text.length;
    var end = start + range1.text.length;
    return { 'start': start, 'end': end };
  }
  return { 'start': element.selectionStart, 'end': element.selectionEnd };
};

/**
 * Build an error message from ahah response.
 */
Drupal.ahahError = function (xmlhttp, uri) {
  if (xmlhttp.status == 200 || (xmlhttp.status == 500 && xmlhttp.statusText == 'Service unavailable (with message)')) {
    if ($.trim(xmlhttp.responseText)) {
      var message = Drupal.t("An error occurred. \nPath: @uri\nMessage: !text", { '@uri': uri, '!text': xmlhttp.responseText });
    }
    else {
      var message = Drupal.t("An error occurred. \nPath: @uri\n(no information available).", {'@uri': uri });
    }
  }
  else {
    var message = Drupal.t("An HTTP error @status occurred. \nPath: @uri", { '@uri': uri, '@status': xmlhttp.status });
  }
  return message.replace(/\n/g, '<br />');
};

// Class indicating that JS is enabled; used for styling purpose.
$('html').addClass('js');

// 'js enabled' cookie.
document.cookie = 'has_js=1; path=/';

// Attach all behaviors.
$(function () {
  Drupal.attachBehaviors(document, Drupal.settings);
});

/**
 * The default themes.
 */
Drupal.theme.prototype = {

  /**
   * Formats text for emphasized display in a placeholder inside a sentence.
   *
   * @param str
   *   The text to format (plain-text).
   * @return
   *   The formatted text (html).
   */
  placeholder: function (str) {
    return '<em>' + Drupal.checkPlain(str) + '</em>';
  }
};

})(jQuery);