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Mauricio Dinarte 2024-12-04 10:11:27 -06:00
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drupal7/web/misc/states.js Normal file
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(function ($) {
/**
* The base States namespace.
*
* Having the local states variable allows us to use the States namespace
* without having to always declare "Drupal.states".
*/
var states = Drupal.states = {
// An array of functions that should be postponed.
postponed: []
};
/**
* Attaches the states.
*/
Drupal.behaviors.states = {
attach: function (context, settings) {
var $context = $(context);
for (var selector in settings.states) {
for (var state in settings.states[selector]) {
new states.Dependent({
element: $context.find(selector),
state: states.State.sanitize(state),
constraints: settings.states[selector][state]
});
}
}
// Execute all postponed functions now.
while (states.postponed.length) {
(states.postponed.shift())();
}
}
};
/**
* Object representing an element that depends on other elements.
*
* @param args
* Object with the following keys (all of which are required):
* - element: A jQuery object of the dependent element
* - state: A State object describing the state that is dependent
* - constraints: An object with dependency specifications. Lists all elements
* that this element depends on. It can be nested and can contain arbitrary
* AND and OR clauses.
*/
states.Dependent = function (args) {
$.extend(this, { values: {}, oldValue: null }, args);
this.dependees = this.getDependees();
for (var selector in this.dependees) {
this.initializeDependee(selector, this.dependees[selector]);
}
};
/**
* Comparison functions for comparing the value of an element with the
* specification from the dependency settings. If the object type can't be
* found in this list, the === operator is used by default.
*/
states.Dependent.comparisons = {
'RegExp': function (reference, value) {
return reference.test(value);
},
'Function': function (reference, value) {
// The "reference" variable is a comparison function.
return reference(value);
},
'Number': function (reference, value) {
// If "reference" is a number and "value" is a string, then cast reference
// as a string before applying the strict comparison in compare(). Otherwise
// numeric keys in the form's #states array fail to match string values
// returned from jQuery's val().
return (typeof value === 'string') ? compare(reference.toString(), value) : compare(reference, value);
}
};
states.Dependent.prototype = {
/**
* Initializes one of the elements this dependent depends on.
*
* @param selector
* The CSS selector describing the dependee.
* @param dependeeStates
* The list of states that have to be monitored for tracking the
* dependee's compliance status.
*/
initializeDependee: function (selector, dependeeStates) {
var state;
// Cache for the states of this dependee.
this.values[selector] = {};
for (var i in dependeeStates) {
if (dependeeStates.hasOwnProperty(i)) {
state = dependeeStates[i];
// Make sure we're not initializing this selector/state combination twice.
if ($.inArray(state, dependeeStates) === -1) {
continue;
}
state = states.State.sanitize(state);
// Initialize the value of this state.
this.values[selector][state.name] = null;
// Monitor state changes of the specified state for this dependee.
$(selector).bind('state:' + state, $.proxy(function (e) {
this.update(selector, state, e.value);
}, this));
// Make sure the event we just bound ourselves to is actually fired.
new states.Trigger({ selector: selector, state: state });
}
}
},
/**
* Compares a value with a reference value.
*
* @param reference
* The value used for reference.
* @param selector
* CSS selector describing the dependee.
* @param state
* A State object describing the dependee's updated state.
*
* @return
* true or false.
*/
compare: function (reference, selector, state) {
var value = this.values[selector][state.name];
if (reference.constructor.name in states.Dependent.comparisons) {
// Use a custom compare function for certain reference value types.
return states.Dependent.comparisons[reference.constructor.name](reference, value);
}
else {
// Do a plain comparison otherwise.
return compare(reference, value);
}
},
/**
* Update the value of a dependee's state.
*
* @param selector
* CSS selector describing the dependee.
* @param state
* A State object describing the dependee's updated state.
* @param value
* The new value for the dependee's updated state.
*/
update: function (selector, state, value) {
// Only act when the 'new' value is actually new.
if (value !== this.values[selector][state.name]) {
this.values[selector][state.name] = value;
this.reevaluate();
}
},
/**
* Triggers change events in case a state changed.
*/
reevaluate: function () {
// Check whether any constraint for this dependent state is satisifed.
var value = this.verifyConstraints(this.constraints);
// Only invoke a state change event when the value actually changed.
if (value !== this.oldValue) {
// Store the new value so that we can compare later whether the value
// actually changed.
this.oldValue = value;
// Normalize the value to match the normalized state name.
value = invert(value, this.state.invert);
// By adding "trigger: true", we ensure that state changes don't go into
// infinite loops.
this.element.trigger({ type: 'state:' + this.state, value: value, trigger: true });
}
},
/**
* Evaluates child constraints to determine if a constraint is satisfied.
*
* @param constraints
* A constraint object or an array of constraints.
* @param selector
* The selector for these constraints. If undefined, there isn't yet a
* selector that these constraints apply to. In that case, the keys of the
* object are interpreted as the selector if encountered.
*
* @return
* true or false, depending on whether these constraints are satisfied.
*/
verifyConstraints: function(constraints, selector) {
var result;
if ($.isArray(constraints)) {
// This constraint is an array (OR or XOR).
var hasXor = $.inArray('xor', constraints) === -1;
for (var i = 0, len = constraints.length; i < len; i++) {
if (constraints[i] != 'xor') {
var constraint = this.checkConstraints(constraints[i], selector, i);
// Return if this is OR and we have a satisfied constraint or if this
// is XOR and we have a second satisfied constraint.
if (constraint && (hasXor || result)) {
return hasXor;
}
result = result || constraint;
}
}
}
// Make sure we don't try to iterate over things other than objects. This
// shouldn't normally occur, but in case the condition definition is bogus,
// we don't want to end up with an infinite loop.
else if ($.isPlainObject(constraints)) {
// This constraint is an object (AND).
for (var n in constraints) {
if (constraints.hasOwnProperty(n)) {
result = ternary(result, this.checkConstraints(constraints[n], selector, n));
// False and anything else will evaluate to false, so return when any
// false condition is found.
if (result === false) { return false; }
}
}
}
return result;
},
/**
* Checks whether the value matches the requirements for this constraint.
*
* @param value
* Either the value of a state or an array/object of constraints. In the
* latter case, resolving the constraint continues.
* @param selector
* The selector for this constraint. If undefined, there isn't yet a
* selector that this constraint applies to. In that case, the state key is
* propagates to a selector and resolving continues.
* @param state
* The state to check for this constraint. If undefined, resolving
* continues.
* If both selector and state aren't undefined and valid non-numeric
* strings, a lookup for the actual value of that selector's state is
* performed. This parameter is not a State object but a pristine state
* string.
*
* @return
* true or false, depending on whether this constraint is satisfied.
*/
checkConstraints: function(value, selector, state) {
// Normalize the last parameter. If it's non-numeric, we treat it either as
// a selector (in case there isn't one yet) or as a trigger/state.
if (typeof state !== 'string' || (/[0-9]/).test(state[0])) {
state = null;
}
else if (typeof selector === 'undefined') {
// Propagate the state to the selector when there isn't one yet.
selector = state;
state = null;
}
if (state !== null) {
// constraints is the actual constraints of an element to check for.
state = states.State.sanitize(state);
return invert(this.compare(value, selector, state), state.invert);
}
else {
// Resolve this constraint as an AND/OR operator.
return this.verifyConstraints(value, selector);
}
},
/**
* Gathers information about all required triggers.
*/
getDependees: function() {
var cache = {};
// Swivel the lookup function so that we can record all available selector-
// state combinations for initialization.
var _compare = this.compare;
this.compare = function(reference, selector, state) {
(cache[selector] || (cache[selector] = [])).push(state.name);
// Return nothing (=== undefined) so that the constraint loops are not
// broken.
};
// This call doesn't actually verify anything but uses the resolving
// mechanism to go through the constraints array, trying to look up each
// value. Since we swivelled the compare function, this comparison returns
// undefined and lookup continues until the very end. Instead of lookup up
// the value, we record that combination of selector and state so that we
// can initialize all triggers.
this.verifyConstraints(this.constraints);
// Restore the original function.
this.compare = _compare;
return cache;
}
};
states.Trigger = function (args) {
$.extend(this, args);
if (this.state in states.Trigger.states) {
this.element = $(this.selector);
// Only call the trigger initializer when it wasn't yet attached to this
// element. Otherwise we'd end up with duplicate events.
if (!this.element.data('trigger:' + this.state)) {
this.initialize();
}
}
};
states.Trigger.prototype = {
initialize: function () {
var trigger = states.Trigger.states[this.state];
if (typeof trigger == 'function') {
// We have a custom trigger initialization function.
trigger.call(window, this.element);
}
else {
for (var event in trigger) {
if (trigger.hasOwnProperty(event)) {
this.defaultTrigger(event, trigger[event]);
}
}
}
// Mark this trigger as initialized for this element.
this.element.data('trigger:' + this.state, true);
},
defaultTrigger: function (event, valueFn) {
var oldValue = valueFn.call(this.element);
// Attach the event callback.
this.element.bind(event, $.proxy(function (e) {
var value = valueFn.call(this.element, e);
// Only trigger the event if the value has actually changed.
if (oldValue !== value) {
this.element.trigger({ type: 'state:' + this.state, value: value, oldValue: oldValue });
oldValue = value;
}
}, this));
states.postponed.push($.proxy(function () {
// Trigger the event once for initialization purposes.
this.element.trigger({ type: 'state:' + this.state, value: oldValue, oldValue: null });
}, this));
}
};
/**
* This list of states contains functions that are used to monitor the state
* of an element. Whenever an element depends on the state of another element,
* one of these trigger functions is added to the dependee so that the
* dependent element can be updated.
*/
states.Trigger.states = {
// 'empty' describes the state to be monitored
empty: {
// 'keyup' is the (native DOM) event that we watch for.
'keyup': function () {
// The function associated to that trigger returns the new value for the
// state.
return this.val() == '';
}
},
checked: {
'change': function () {
return this.is(':checked');
}
},
// For radio buttons, only return the value if the radio button is selected.
value: {
'keyup': function () {
// Radio buttons share the same :input[name="key"] selector.
if (this.length > 1) {
// Initial checked value of radios is undefined, so we return false.
return this.filter(':checked').val() || false;
}
return this.val();
},
'change': function () {
// Radio buttons share the same :input[name="key"] selector.
if (this.length > 1) {
// Initial checked value of radios is undefined, so we return false.
return this.filter(':checked').val() || false;
}
return this.val();
}
},
collapsed: {
'collapsed': function(e) {
return (typeof e !== 'undefined' && 'value' in e) ? e.value : this.is('.collapsed');
}
}
};
/**
* A state object is used for describing the state and performing aliasing.
*/
states.State = function(state) {
// We may need the original unresolved name later.
this.pristine = this.name = state;
// Normalize the state name.
while (true) {
// Iteratively remove exclamation marks and invert the value.
while (this.name.charAt(0) == '!') {
this.name = this.name.substring(1);
this.invert = !this.invert;
}
// Replace the state with its normalized name.
if (this.name in states.State.aliases) {
this.name = states.State.aliases[this.name];
}
else {
break;
}
}
};
/**
* Creates a new State object by sanitizing the passed value.
*/
states.State.sanitize = function (state) {
if (state instanceof states.State) {
return state;
}
else {
return new states.State(state);
}
};
/**
* This list of aliases is used to normalize states and associates negated names
* with their respective inverse state.
*/
states.State.aliases = {
'enabled': '!disabled',
'invisible': '!visible',
'invalid': '!valid',
'untouched': '!touched',
'optional': '!required',
'filled': '!empty',
'unchecked': '!checked',
'irrelevant': '!relevant',
'expanded': '!collapsed',
'readwrite': '!readonly'
};
states.State.prototype = {
invert: false,
/**
* Ensures that just using the state object returns the name.
*/
toString: function() {
return this.name;
}
};
/**
* Global state change handlers. These are bound to "document" to cover all
* elements whose state changes. Events sent to elements within the page
* bubble up to these handlers. We use this system so that themes and modules
* can override these state change handlers for particular parts of a page.
*/
$(document).bind('state:disabled', function(e) {
// Only act when this change was triggered by a dependency and not by the
// element monitoring itself.
if (e.trigger) {
$(e.target)
.attr('disabled', e.value)
.closest('.form-item, .form-submit, .form-wrapper').toggleClass('form-disabled', e.value)
.find('select, input, textarea').attr('disabled', e.value);
// Note: WebKit nightlies don't reflect that change correctly.
// See https://bugs.webkit.org/show_bug.cgi?id=23789
}
});
$(document).bind('state:required', function(e) {
if (e.trigger) {
if (e.value) {
var $label = $(e.target).closest('.form-item, .form-wrapper').find('label');
// Avoids duplicate required markers on initialization.
if (!$label.find('.form-required').length) {
$label.append('<span class="form-required">*</span>');
}
}
else {
$(e.target).closest('.form-item, .form-wrapper').find('label .form-required').remove();
}
}
});
$(document).bind('state:visible', function(e) {
if (e.trigger) {
$(e.target).closest('.form-item, .form-submit, .form-wrapper').toggle(e.value);
}
});
$(document).bind('state:checked', function(e) {
if (e.trigger) {
$(e.target).attr('checked', e.value);
}
});
$(document).bind('state:collapsed', function(e) {
if (e.trigger) {
if ($(e.target).is('.collapsed') !== e.value) {
$('> legend a', e.target).click();
}
}
});
/**
* These are helper functions implementing addition "operators" and don't
* implement any logic that is particular to states.
*/
// Bitwise AND with a third undefined state.
function ternary (a, b) {
return typeof a === 'undefined' ? b : (typeof b === 'undefined' ? a : a && b);
}
// Inverts a (if it's not undefined) when invert is true.
function invert (a, invert) {
return (invert && typeof a !== 'undefined') ? !a : a;
}
// Compares two values while ignoring undefined values.
function compare (a, b) {
return (a === b) ? (typeof a === 'undefined' ? a : true) : (typeof a === 'undefined' || typeof b === 'undefined');
}
})(jQuery);