557 lines
17 KiB
JavaScript
557 lines
17 KiB
JavaScript
(function ($) {
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/**
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* The base States namespace.
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*
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* Having the local states variable allows us to use the States namespace
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* without having to always declare "Drupal.states".
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*/
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var states = Drupal.states = {
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// An array of functions that should be postponed.
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postponed: []
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};
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/**
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* Attaches the states.
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*/
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Drupal.behaviors.states = {
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attach: function (context, settings) {
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for (var selector in settings.states) {
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for (var state in settings.states[selector]) {
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new states.Dependent({
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element: $(selector),
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state: states.State.sanitize(state),
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constraints: settings.states[selector][state]
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});
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}
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}
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// Execute all postponed functions now.
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while (states.postponed.length) {
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(states.postponed.shift())();
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}
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}
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};
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/**
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* Object representing an element that depends on other elements.
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*
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* @param args
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* Object with the following keys (all of which are required):
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* - element: A jQuery object of the dependent element
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* - state: A State object describing the state that is dependent
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* - constraints: An object with dependency specifications. Lists all elements
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* that this element depends on. It can be nested and can contain arbitrary
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* AND and OR clauses.
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*/
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states.Dependent = function (args) {
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$.extend(this, { values: {}, oldValue: null }, args);
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this.dependees = this.getDependees();
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for (var selector in this.dependees) {
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this.initializeDependee(selector, this.dependees[selector]);
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}
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};
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/**
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* Comparison functions for comparing the value of an element with the
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* specification from the dependency settings. If the object type can't be
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* found in this list, the === operator is used by default.
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*/
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states.Dependent.comparisons = {
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'RegExp': function (reference, value) {
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return reference.test(value);
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},
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'Function': function (reference, value) {
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// The "reference" variable is a comparison function.
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return reference(value);
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},
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'Number': function (reference, value) {
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// If "reference" is a number and "value" is a string, then cast reference
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// as a string before applying the strict comparison in compare(). Otherwise
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// numeric keys in the form's #states array fail to match string values
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// returned from jQuery's val().
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return (typeof value === 'string') ? compare(reference.toString(), value) : compare(reference, value);
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}
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};
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states.Dependent.prototype = {
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/**
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* Initializes one of the elements this dependent depends on.
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*
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* @param selector
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* The CSS selector describing the dependee.
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* @param dependeeStates
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* The list of states that have to be monitored for tracking the
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* dependee's compliance status.
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*/
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initializeDependee: function (selector, dependeeStates) {
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var state;
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// Cache for the states of this dependee.
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this.values[selector] = {};
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for (var i in dependeeStates) {
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if (dependeeStates.hasOwnProperty(i)) {
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state = dependeeStates[i];
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// Make sure we're not initializing this selector/state combination twice.
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if ($.inArray(state, dependeeStates) === -1) {
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continue;
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}
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state = states.State.sanitize(state);
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// Initialize the value of this state.
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this.values[selector][state.name] = null;
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// Monitor state changes of the specified state for this dependee.
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$(selector).bind('state:' + state, $.proxy(function (e) {
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this.update(selector, state, e.value);
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}, this));
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// Make sure the event we just bound ourselves to is actually fired.
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new states.Trigger({ selector: selector, state: state });
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}
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}
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},
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/**
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* Compares a value with a reference value.
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*
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* @param reference
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* The value used for reference.
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* @param selector
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* CSS selector describing the dependee.
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* @param state
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* A State object describing the dependee's updated state.
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*
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* @return
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* true or false.
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*/
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compare: function (reference, selector, state) {
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var value = this.values[selector][state.name];
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if (reference.constructor.name in states.Dependent.comparisons) {
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// Use a custom compare function for certain reference value types.
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return states.Dependent.comparisons[reference.constructor.name](reference, value);
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}
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else {
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// Do a plain comparison otherwise.
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return compare(reference, value);
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}
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},
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/**
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* Update the value of a dependee's state.
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*
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* @param selector
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* CSS selector describing the dependee.
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* @param state
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* A State object describing the dependee's updated state.
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* @param value
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* The new value for the dependee's updated state.
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*/
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update: function (selector, state, value) {
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// Only act when the 'new' value is actually new.
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if (value !== this.values[selector][state.name]) {
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this.values[selector][state.name] = value;
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this.reevaluate();
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}
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},
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/**
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* Triggers change events in case a state changed.
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*/
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reevaluate: function () {
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// Check whether any constraint for this dependent state is satisifed.
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var value = this.verifyConstraints(this.constraints);
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// Only invoke a state change event when the value actually changed.
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if (value !== this.oldValue) {
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// Store the new value so that we can compare later whether the value
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// actually changed.
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this.oldValue = value;
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// Normalize the value to match the normalized state name.
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value = invert(value, this.state.invert);
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// By adding "trigger: true", we ensure that state changes don't go into
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// infinite loops.
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this.element.trigger({ type: 'state:' + this.state, value: value, trigger: true });
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}
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},
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/**
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* Evaluates child constraints to determine if a constraint is satisfied.
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*
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* @param constraints
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* A constraint object or an array of constraints.
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* @param selector
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* The selector for these constraints. If undefined, there isn't yet a
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* selector that these constraints apply to. In that case, the keys of the
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* object are interpreted as the selector if encountered.
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*
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* @return
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* true or false, depending on whether these constraints are satisfied.
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*/
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verifyConstraints: function(constraints, selector) {
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var result;
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if ($.isArray(constraints)) {
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// This constraint is an array (OR or XOR).
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var hasXor = $.inArray('xor', constraints) === -1;
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for (var i = 0, len = constraints.length; i < len; i++) {
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if (constraints[i] != 'xor') {
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var constraint = this.checkConstraints(constraints[i], selector, i);
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// Return if this is OR and we have a satisfied constraint or if this
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// is XOR and we have a second satisfied constraint.
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if (constraint && (hasXor || result)) {
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return hasXor;
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}
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result = result || constraint;
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}
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}
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}
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// Make sure we don't try to iterate over things other than objects. This
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// shouldn't normally occur, but in case the condition definition is bogus,
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// we don't want to end up with an infinite loop.
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else if ($.isPlainObject(constraints)) {
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// This constraint is an object (AND).
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for (var n in constraints) {
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if (constraints.hasOwnProperty(n)) {
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result = ternary(result, this.checkConstraints(constraints[n], selector, n));
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// False and anything else will evaluate to false, so return when any
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// false condition is found.
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if (result === false) { return false; }
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}
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}
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}
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return result;
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},
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/**
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* Checks whether the value matches the requirements for this constraint.
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*
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* @param value
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* Either the value of a state or an array/object of constraints. In the
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* latter case, resolving the constraint continues.
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* @param selector
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* The selector for this constraint. If undefined, there isn't yet a
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* selector that this constraint applies to. In that case, the state key is
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* propagates to a selector and resolving continues.
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* @param state
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* The state to check for this constraint. If undefined, resolving
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* continues.
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* If both selector and state aren't undefined and valid non-numeric
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* strings, a lookup for the actual value of that selector's state is
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* performed. This parameter is not a State object but a pristine state
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* string.
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*
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* @return
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* true or false, depending on whether this constraint is satisfied.
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*/
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checkConstraints: function(value, selector, state) {
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// Normalize the last parameter. If it's non-numeric, we treat it either as
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// a selector (in case there isn't one yet) or as a trigger/state.
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if (typeof state !== 'string' || (/[0-9]/).test(state[0])) {
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state = null;
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}
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else if (typeof selector === 'undefined') {
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// Propagate the state to the selector when there isn't one yet.
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selector = state;
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state = null;
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}
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if (state !== null) {
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// constraints is the actual constraints of an element to check for.
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state = states.State.sanitize(state);
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return invert(this.compare(value, selector, state), state.invert);
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}
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else {
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// Resolve this constraint as an AND/OR operator.
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return this.verifyConstraints(value, selector);
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}
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},
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/**
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* Gathers information about all required triggers.
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*/
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getDependees: function() {
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var cache = {};
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// Swivel the lookup function so that we can record all available selector-
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// state combinations for initialization.
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var _compare = this.compare;
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this.compare = function(reference, selector, state) {
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(cache[selector] || (cache[selector] = [])).push(state.name);
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// Return nothing (=== undefined) so that the constraint loops are not
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// broken.
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};
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// This call doesn't actually verify anything but uses the resolving
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// mechanism to go through the constraints array, trying to look up each
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// value. Since we swivelled the compare function, this comparison returns
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// undefined and lookup continues until the very end. Instead of lookup up
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// the value, we record that combination of selector and state so that we
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// can initialize all triggers.
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this.verifyConstraints(this.constraints);
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// Restore the original function.
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this.compare = _compare;
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return cache;
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}
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};
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states.Trigger = function (args) {
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$.extend(this, args);
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if (this.state in states.Trigger.states) {
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this.element = $(this.selector);
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// Only call the trigger initializer when it wasn't yet attached to this
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// element. Otherwise we'd end up with duplicate events.
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if (!this.element.data('trigger:' + this.state)) {
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this.initialize();
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}
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}
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};
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states.Trigger.prototype = {
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initialize: function () {
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var trigger = states.Trigger.states[this.state];
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if (typeof trigger == 'function') {
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// We have a custom trigger initialization function.
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trigger.call(window, this.element);
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}
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else {
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for (var event in trigger) {
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if (trigger.hasOwnProperty(event)) {
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this.defaultTrigger(event, trigger[event]);
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}
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}
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}
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// Mark this trigger as initialized for this element.
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this.element.data('trigger:' + this.state, true);
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},
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defaultTrigger: function (event, valueFn) {
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var oldValue = valueFn.call(this.element);
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// Attach the event callback.
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this.element.bind(event, $.proxy(function (e) {
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var value = valueFn.call(this.element, e);
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// Only trigger the event if the value has actually changed.
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if (oldValue !== value) {
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this.element.trigger({ type: 'state:' + this.state, value: value, oldValue: oldValue });
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oldValue = value;
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}
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}, this));
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states.postponed.push($.proxy(function () {
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// Trigger the event once for initialization purposes.
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this.element.trigger({ type: 'state:' + this.state, value: oldValue, oldValue: null });
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}, this));
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}
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};
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/**
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* This list of states contains functions that are used to monitor the state
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* of an element. Whenever an element depends on the state of another element,
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* one of these trigger functions is added to the dependee so that the
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* dependent element can be updated.
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*/
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states.Trigger.states = {
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// 'empty' describes the state to be monitored
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empty: {
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// 'keyup' is the (native DOM) event that we watch for.
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'keyup': function () {
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// The function associated to that trigger returns the new value for the
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// state.
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return this.val() == '';
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}
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},
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checked: {
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'change': function () {
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// prop() and attr() only takes the first element into account. To support
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// selectors matching multiple checkboxes, iterate over all and return
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// whether any is checked.
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var checked = false;
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this.each(function () {
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// Use prop() here as we want a boolean of the checkbox state.
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// @see http://api.jquery.com/prop/
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checked = $(this).prop('checked');
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// Break the each() loop if this is checked.
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return !checked;
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});
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return checked;
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}
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},
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// For radio buttons, only return the value if the radio button is selected.
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value: {
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'keyup': function () {
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// Radio buttons share the same :input[name="key"] selector.
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if (this.length > 1) {
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// Initial checked value of radios is undefined, so we return false.
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return this.filter(':checked').val() || false;
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}
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return this.val();
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},
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'change': function () {
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// Radio buttons share the same :input[name="key"] selector.
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if (this.length > 1) {
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// Initial checked value of radios is undefined, so we return false.
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return this.filter(':checked').val() || false;
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}
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return this.val();
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}
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},
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collapsed: {
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'collapsed': function(e) {
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return (typeof e !== 'undefined' && 'value' in e) ? e.value : this.is('.collapsed');
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}
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}
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};
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/**
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* A state object is used for describing the state and performing aliasing.
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*/
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states.State = function(state) {
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// We may need the original unresolved name later.
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this.pristine = this.name = state;
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// Normalize the state name.
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while (true) {
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// Iteratively remove exclamation marks and invert the value.
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while (this.name.charAt(0) == '!') {
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this.name = this.name.substring(1);
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this.invert = !this.invert;
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}
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// Replace the state with its normalized name.
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if (this.name in states.State.aliases) {
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this.name = states.State.aliases[this.name];
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}
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else {
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break;
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}
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}
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};
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/**
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* Creates a new State object by sanitizing the passed value.
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*/
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states.State.sanitize = function (state) {
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if (state instanceof states.State) {
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return state;
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}
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else {
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return new states.State(state);
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}
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};
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/**
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* This list of aliases is used to normalize states and associates negated names
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* with their respective inverse state.
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*/
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states.State.aliases = {
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'enabled': '!disabled',
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'invisible': '!visible',
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'invalid': '!valid',
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'untouched': '!touched',
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'optional': '!required',
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'filled': '!empty',
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'unchecked': '!checked',
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'irrelevant': '!relevant',
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'expanded': '!collapsed',
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'readwrite': '!readonly'
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};
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states.State.prototype = {
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invert: false,
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/**
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* Ensures that just using the state object returns the name.
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*/
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toString: function() {
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return this.name;
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}
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};
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/**
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* Global state change handlers. These are bound to "document" to cover all
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* elements whose state changes. Events sent to elements within the page
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* bubble up to these handlers. We use this system so that themes and modules
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* can override these state change handlers for particular parts of a page.
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*/
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$(document).bind('state:disabled', function(e) {
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// Only act when this change was triggered by a dependency and not by the
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// element monitoring itself.
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if (e.trigger) {
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$(e.target)
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.attr('disabled', e.value)
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.filter('.form-element')
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.closest('.form-item, .form-submit, .form-wrapper').toggleClass('form-disabled', e.value);
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// Note: WebKit nightlies don't reflect that change correctly.
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// See https://bugs.webkit.org/show_bug.cgi?id=23789
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}
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});
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$(document).bind('state:required', function(e) {
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if (e.trigger) {
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if (e.value) {
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$(e.target).closest('.form-item, .form-wrapper').find('label').append('<abbr class="form-required" title="' + Drupal.t('This field is required.') + '">*</abbr>');
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}
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else {
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$(e.target).closest('.form-item, .form-wrapper').find('label .form-required').remove();
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}
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}
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});
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$(document).bind('state:visible', function(e) {
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if (e.trigger) {
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$(e.target).closest('.form-item, .form-submit, .form-wrapper').toggle(e.value);
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}
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});
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$(document).bind('state:checked', function(e) {
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if (e.trigger) {
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$(e.target).attr('checked', e.value);
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}
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});
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$(document).bind('state:collapsed', function(e) {
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if (e.trigger) {
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if ($(e.target).is('.collapsed') !== e.value) {
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$('> legend a', e.target).click();
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}
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}
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});
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/**
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* These are helper functions implementing addition "operators" and don't
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* implement any logic that is particular to states.
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*/
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// Bitwise AND with a third undefined state.
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function ternary (a, b) {
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return typeof a === 'undefined' ? b : (typeof b === 'undefined' ? a : a && b);
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}
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// Inverts a (if it's not undefined) when invert is true.
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function invert (a, invert) {
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return (invert && typeof a !== 'undefined') ? !a : a;
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}
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// Compares two values while ignoring undefined values.
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function compare (a, b) {
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return (a === b) ? (typeof a === 'undefined' ? a : true) : (typeof a === 'undefined' || typeof b === 'undefined');
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}
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})(jQuery);
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