src/ngMessages/messages.js
'use strict';
var forEach;
var isArray;
var isString;
var jqLite;
/**
* @ngdoc module
* @name ngMessages
* @description
*
* The `ngMessages` module provides enhanced support for displaying messages within templates
* (typically within forms or when rendering message objects that return key/value data).
* Instead of relying on JavaScript code and/or complex ng-if statements within your form template to
* show and hide error messages specific to the state of an input field, the `ngMessages` and
* `ngMessage` directives are designed to handle the complexity, inheritance and priority
* sequencing based on the order of how the messages are defined in the template.
*
* Currently, the ngMessages module only contains the code for the `ngMessages`, `ngMessagesInclude`
* `ngMessage`, `ngMessageExp` and `ngMessageDefault` directives.
*
* ## Usage
* The `ngMessages` directive allows keys in a key/value collection to be associated with a child element
* (or 'message') that will show or hide based on the truthiness of that key's value in the collection. A common use
* case for `ngMessages` is to display error messages for inputs using the `$error` object exposed by the
* {@link ngModel ngModel} directive.
*
* The child elements of the `ngMessages` directive are matched to the collection keys by a `ngMessage` or
* `ngMessageExp` directive. The value of these attributes must match a key in the collection that is provided by
* the `ngMessages` directive.
*
* Consider the following example, which illustrates a typical use case of `ngMessages`. Within the form `myForm` we
* have a text input named `myField` which is bound to the scope variable `field` using the {@link ngModel ngModel}
* directive.
*
* The `myField` field is a required input of type `email` with a maximum length of 15 characters.
*
* ```html
* <form name="myForm">
* <label>
* Enter text:
* <input type="email" ng-model="field" name="myField" required maxlength="15" />
* </label>
* <div ng-messages="myForm.myField.$error" role="alert">
* <div ng-message="required">Please enter a value for this field.</div>
* <div ng-message="email">This field must be a valid email address.</div>
* <div ng-message="maxlength">This field can be at most 15 characters long.</div>
* </div>
* </form>
* ```
*
* In order to show error messages corresponding to `myField` we first create an element with an `ngMessages` attribute
* set to the `$error` object owned by the `myField` input in our `myForm` form.
*
* Within this element we then create separate elements for each of the possible errors that `myField` could have.
* The `ngMessage` attribute is used to declare which element(s) will appear for which error - for example,
* setting `ng-message="required"` specifies that this particular element should be displayed when there
* is no value present for the required field `myField` (because the key `required` will be `true` in the object
* `myForm.myField.$error`).
*
* ### Message order
*
* By default, `ngMessages` will only display one message for a particular key/value collection at any time. If more
* than one message (or error) key is currently true, then which message is shown is determined by the order of messages
* in the HTML template code (messages declared first are prioritised). This mechanism means the developer does not have
* to prioritize messages using custom JavaScript code.
*
* Given the following error object for our example (which informs us that the field `myField` currently has both the
* `required` and `email` errors):
*
* ```javascript
* <!-- keep in mind that ngModel automatically sets these error flags -->
* myField.$error = { required : true, email: true, maxlength: false };
* ```
* The `required` message will be displayed to the user since it appears before the `email` message in the DOM.
* Once the user types a single character, the `required` message will disappear (since the field now has a value)
* but the `email` message will be visible because it is still applicable.
*
* ### Displaying multiple messages at the same time
*
* While `ngMessages` will by default only display one error element at a time, the `ng-messages-multiple` attribute can
* be applied to the `ngMessages` container element to cause it to display all applicable error messages at once:
*
* ```html
* <!-- attribute-style usage -->
* <div ng-messages="myForm.myField.$error" ng-messages-multiple>...</div>
*
* <!-- element-style usage -->
* <ng-messages for="myForm.myField.$error" multiple>...</ng-messages>
* ```
*
* ## Reusing and Overriding Messages
* In addition to prioritization, ngMessages also allows for including messages from a remote or an inline
* template. This allows for generic collection of messages to be reused across multiple parts of an
* application.
*
* ```html
* <script type="text/ng-template" id="error-messages">
* <div ng-message="required">This field is required</div>
* <div ng-message="minlength">This field is too short</div>
* </script>
*
* <div ng-messages="myForm.myField.$error" role="alert">
* <div ng-messages-include="error-messages"></div>
* </div>
* ```
*
* However, including generic messages may not be useful enough to match all input fields, therefore,
* `ngMessages` provides the ability to override messages defined in the remote template by redefining
* them within the directive container.
*
* ```html
* <!-- a generic template of error messages known as "my-custom-messages" -->
* <script type="text/ng-template" id="my-custom-messages">
* <div ng-message="required">This field is required</div>
* <div ng-message="minlength">This field is too short</div>
* </script>
*
* <form name="myForm">
* <label>
* Email address
* <input type="email"
* id="email"
* name="myEmail"
* ng-model="email"
* minlength="5"
* required />
* </label>
* <!-- any ng-message elements that appear BEFORE the ng-messages-include will
* override the messages present in the ng-messages-include template -->
* <div ng-messages="myForm.myEmail.$error" role="alert">
* <!-- this required message has overridden the template message -->
* <div ng-message="required">You did not enter your email address</div>
*
* <!-- this is a brand new message and will appear last in the prioritization -->
* <div ng-message="email">Your email address is invalid</div>
*
* <!-- and here are the generic error messages -->
* <div ng-messages-include="my-custom-messages"></div>
* </div>
* </form>
* ```
*
* In the example HTML code above the message that is set on required will override the corresponding
* required message defined within the remote template. Therefore, with particular input fields (such
* email addresses, date fields, autocomplete inputs, etc...), specialized error messages can be applied
* while more generic messages can be used to handle other, more general input errors.
*
* ## Dynamic Messaging
* ngMessages also supports using expressions to dynamically change key values. Using arrays and
* repeaters to list messages is also supported. This means that the code below will be able to
* fully adapt itself and display the appropriate message when any of the expression data changes:
*
* ```html
* <form name="myForm">
* <label>
* Email address
* <input type="email"
* name="myEmail"
* ng-model="email"
* minlength="5"
* required />
* </label>
* <div ng-messages="myForm.myEmail.$error" role="alert">
* <div ng-message="required">You did not enter your email address</div>
* <div ng-repeat="errorMessage in errorMessages">
* <!-- use ng-message-exp for a message whose key is given by an expression -->
* <div ng-message-exp="errorMessage.type">{{ errorMessage.text }}</div>
* </div>
* </div>
* </form>
* ```
*
* The `errorMessage.type` expression can be a string value or it can be an array so
* that multiple errors can be associated with a single error message:
*
* ```html
* <label>
* Email address
* <input type="email"
* ng-model="data.email"
* name="myEmail"
* ng-minlength="5"
* ng-maxlength="100"
* required />
* </label>
* <div ng-messages="myForm.myEmail.$error" role="alert">
* <div ng-message-exp="'required'">You did not enter your email address</div>
* <div ng-message-exp="['minlength', 'maxlength']">
* Your email must be between 5 and 100 characters long
* </div>
* </div>
* ```
*
* Feel free to use other structural directives such as ng-if and ng-switch to further control
* what messages are active and when. Be careful, if you place ng-message on the same element
* as these structural directives, AngularJS may not be able to determine if a message is active
* or not. Therefore it is best to place the ng-message on a child element of the structural
* directive.
*
* ```html
* <div ng-messages="myForm.myEmail.$error" role="alert">
* <div ng-if="showRequiredError">
* <div ng-message="required">Please enter something</div>
* </div>
* </div>
* ```
*
* ## Animations
* If the `ngAnimate` module is active within the application then the `ngMessages`, `ngMessage` and
* `ngMessageExp` directives will trigger animations whenever any messages are added and removed from
* the DOM by the `ngMessages` directive.
*
* Whenever the `ngMessages` directive contains one or more visible messages then the `.ng-active` CSS
* class will be added to the element. The `.ng-inactive` CSS class will be applied when there are no
* messages present. Therefore, CSS transitions and keyframes as well as JavaScript animations can
* hook into the animations whenever these classes are added/removed.
*
* Let's say that our HTML code for our messages container looks like so:
*
* ```html
* <div ng-messages="myMessages" class="my-messages" role="alert">
* <div ng-message="alert" class="some-message">...</div>
* <div ng-message="fail" class="some-message">...</div>
* </div>
* ```
*
* Then the CSS animation code for the message container looks like so:
*
* ```css
* .my-messages {
* transition:1s linear all;
* }
* .my-messages.ng-active {
* // messages are visible
* }
* .my-messages.ng-inactive {
* // messages are hidden
* }
* ```
*
* Whenever an inner message is attached (becomes visible) or removed (becomes hidden) then the enter
* and leave animation is triggered for each particular element bound to the `ngMessage` directive.
*
* Therefore, the CSS code for the inner messages looks like so:
*
* ```css
* .some-message {
* transition:1s linear all;
* }
*
* .some-message.ng-enter {}
* .some-message.ng-enter.ng-enter-active {}
*
* .some-message.ng-leave {}
* .some-message.ng-leave.ng-leave-active {}
* ```
*
* {@link ngAnimate See the ngAnimate docs} to learn how to use JavaScript animations or to learn
* more about ngAnimate.
*
* ## Displaying a default message
* If the ngMessages renders no inner ngMessage directive (i.e. when none of the truthy
* keys are matched by a defined message), then it will render a default message
* using the {@link ngMessageDefault} directive.
* Note that matched messages will always take precedence over unmatched messages. That means
* the default message will not be displayed when another message is matched. This is also
* true for `ng-messages-multiple`.
*
* ```html
* <div ng-messages="myForm.myField.$error" role="alert">
* <div ng-message="required">This field is required</div>
* <div ng-message="minlength">This field is too short</div>
* <div ng-message-default>This field has an input error</div>
* </div>
* ```
*
*/
angular.module('ngMessages', [], function initAngularHelpers() {
// Access helpers from AngularJS core.
// Do it inside a `config` block to ensure `window.angular` is available.
forEach = angular.forEach;
isArray = angular.isArray;
isString = angular.isString;
jqLite = angular.element;
})
.info({ angularVersion: '"NG_VERSION_FULL"' })
/**
* @ngdoc directive
* @module ngMessages
* @name ngMessages
* @restrict AE
*
* @description
* `ngMessages` is a directive that is designed to show and hide messages based on the state
* of a key/value object that it listens on. The directive itself complements error message
* reporting with the `ngModel` $error object (which stores a key/value state of validation errors).
*
* `ngMessages` manages the state of internal messages within its container element. The internal
* messages use the `ngMessage` directive and will be inserted/removed from the page depending
* on if they're present within the key/value object. By default, only one message will be displayed
* at a time and this depends on the prioritization of the messages within the template. (This can
* be changed by using the `ng-messages-multiple` or `multiple` attribute on the directive container.)
*
* A remote template can also be used (With {@link ngMessagesInclude}) to promote message
* reusability and messages can also be overridden.
*
* A default message can also be displayed when no `ngMessage` directive is inserted, using the
* {@link ngMessageDefault} directive.
*
* {@link module:ngMessages Click here} to learn more about `ngMessages` and `ngMessage`.
*
* @usage
* ```html
* <!-- using attribute directives -->
* <ANY ng-messages="expression" role="alert">
* <ANY ng-message="stringValue">...</ANY>
* <ANY ng-message="stringValue1, stringValue2, ...">...</ANY>
* <ANY ng-message-exp="expressionValue">...</ANY>
* <ANY ng-message-default>...</ANY>
* </ANY>
*
* <!-- or by using element directives -->
* <ng-messages for="expression" role="alert">
* <ng-message when="stringValue">...</ng-message>
* <ng-message when="stringValue1, stringValue2, ...">...</ng-message>
* <ng-message when-exp="expressionValue">...</ng-message>
* <ng-message-default>...</ng-message-default>
* </ng-messages>
* ```
*
* @param {string} ngMessages an AngularJS expression evaluating to a key/value object
* (this is typically the $error object on an ngModel instance).
* @param {string=} ngMessagesMultiple|multiple when set, all messages will be displayed with true
*
* @example
* <example name="ngMessages-directive" module="ngMessagesExample"
* deps="angular-messages.js"
* animations="true" fixBase="true">
* <file name="index.html">
* <form name="myForm">
* <label>
* Enter your name:
* <input type="text"
* name="myName"
* ng-model="name"
* ng-minlength="5"
* ng-maxlength="20"
* required />
* </label>
* <pre>myForm.myName.$error = {{ myForm.myName.$error | json }}</pre>
*
* <div ng-messages="myForm.myName.$error" style="color:maroon" role="alert">
* <div ng-message="required">You did not enter a field</div>
* <div ng-message="minlength">Your field is too short</div>
* <div ng-message="maxlength">Your field is too long</div>
* <div ng-message-default>This field has an input error</div>
* </div>
* </form>
* </file>
* <file name="script.js">
* angular.module('ngMessagesExample', ['ngMessages']);
* </file>
* </example>
*/
.directive('ngMessages', ['$animate', function($animate) {
var ACTIVE_CLASS = 'ng-active';
var INACTIVE_CLASS = 'ng-inactive';
return {
require: 'ngMessages',
restrict: 'AE',
controller: ['$element', '$scope', '$attrs', function NgMessagesCtrl($element, $scope, $attrs) {
var ctrl = this;
var latestKey = 0;
var nextAttachId = 0;
this.getAttachId = function getAttachId() { return nextAttachId++; };
var messages = this.messages = {};
var renderLater, cachedCollection;
this.render = function(collection) {
collection = collection || {};
renderLater = false;
cachedCollection = collection;
// this is true if the attribute is empty or if the attribute value is truthy
var multiple = isAttrTruthy($scope, $attrs.ngMessagesMultiple) ||
isAttrTruthy($scope, $attrs.multiple);
var unmatchedMessages = [];
var matchedKeys = {};
var truthyKeys = 0;
var messageItem = ctrl.head;
var messageFound = false;
var totalMessages = 0;
// we use != instead of !== to allow for both undefined and null values
while (messageItem != null) {
totalMessages++;
var messageCtrl = messageItem.message;
var messageUsed = false;
if (!messageFound) {
forEach(collection, function(value, key) {
if (truthy(value) && !messageUsed) {
truthyKeys++;
if (messageCtrl.test(key)) {
// this is to prevent the same error name from showing up twice
if (matchedKeys[key]) return;
matchedKeys[key] = true;
messageUsed = true;
messageCtrl.attach();
}
}
});
}
if (messageUsed) {
// unless we want to display multiple messages then we should
// set a flag here to avoid displaying the next message in the list
messageFound = !multiple;
} else {
unmatchedMessages.push(messageCtrl);
}
messageItem = messageItem.next;
}
forEach(unmatchedMessages, function(messageCtrl) {
messageCtrl.detach();
});
var messageMatched = unmatchedMessages.length !== totalMessages;
var attachDefault = ctrl.default && !messageMatched && truthyKeys > 0;
if (attachDefault) {
ctrl.default.attach();
} else if (ctrl.default) {
ctrl.default.detach();
}
if (messageMatched || attachDefault) {
$animate.setClass($element, ACTIVE_CLASS, INACTIVE_CLASS);
} else {
$animate.setClass($element, INACTIVE_CLASS, ACTIVE_CLASS);
}
};
$scope.$watchCollection($attrs.ngMessages || $attrs['for'], ctrl.render);
this.reRender = function() {
if (!renderLater) {
renderLater = true;
$scope.$evalAsync(function() {
if (renderLater && cachedCollection) {
ctrl.render(cachedCollection);
}
});
}
};
this.register = function(comment, messageCtrl, isDefault) {
if (isDefault) {
ctrl.default = messageCtrl;
} else {
var nextKey = latestKey.toString();
messages[nextKey] = {
message: messageCtrl
};
insertMessageNode($element[0], comment, nextKey);
comment.$$ngMessageNode = nextKey;
latestKey++;
}
ctrl.reRender();
};
this.deregister = function(comment, isDefault) {
if (isDefault) {
delete ctrl.default;
} else {
var key = comment.$$ngMessageNode;
delete comment.$$ngMessageNode;
removeMessageNode($element[0], comment, key);
delete messages[key];
}
ctrl.reRender();
};
function findPreviousMessage(parent, comment) {
var prevNode = comment;
var parentLookup = [];
while (prevNode && prevNode !== parent) {
var prevKey = prevNode.$$ngMessageNode;
if (prevKey && prevKey.length) {
return messages[prevKey];
}
// dive deeper into the DOM and examine its children for any ngMessage
// comments that may be in an element that appears deeper in the list
if (prevNode.childNodes.length && parentLookup.indexOf(prevNode) === -1) {
parentLookup.push(prevNode);
prevNode = prevNode.childNodes[prevNode.childNodes.length - 1];
} else if (prevNode.previousSibling) {
prevNode = prevNode.previousSibling;
} else {
prevNode = prevNode.parentNode;
parentLookup.push(prevNode);
}
}
}
function insertMessageNode(parent, comment, key) {
var messageNode = messages[key];
if (!ctrl.head) {
ctrl.head = messageNode;
} else {
var match = findPreviousMessage(parent, comment);
if (match) {
messageNode.next = match.next;
match.next = messageNode;
} else {
messageNode.next = ctrl.head;
ctrl.head = messageNode;
}
}
}
function removeMessageNode(parent, comment, key) {
var messageNode = messages[key];
// This message node may have already been removed by a call to deregister()
if (!messageNode) return;
var match = findPreviousMessage(parent, comment);
if (match) {
match.next = messageNode.next;
} else {
ctrl.head = messageNode.next;
}
}
}]
};
function isAttrTruthy(scope, attr) {
return (isString(attr) && attr.length === 0) || //empty attribute
truthy(scope.$eval(attr));
}
function truthy(val) {
return isString(val) ? val.length : !!val;
}
}])
/**
* @ngdoc directive
* @name ngMessagesInclude
* @restrict AE
* @scope
*
* @description
* `ngMessagesInclude` is a directive with the purpose to import existing ngMessage template
* code from a remote template and place the downloaded template code into the exact spot
* that the ngMessagesInclude directive is placed within the ngMessages container. This allows
* for a series of pre-defined messages to be reused and also allows for the developer to
* determine what messages are overridden due to the placement of the ngMessagesInclude directive.
*
* @usage
* ```html
* <!-- using attribute directives -->
* <ANY ng-messages="expression" role="alert">
* <ANY ng-messages-include="remoteTplString">...</ANY>
* </ANY>
*
* <!-- or by using element directives -->
* <ng-messages for="expression" role="alert">
* <ng-messages-include src="expressionValue1">...</ng-messages-include>
* </ng-messages>
* ```
*
* {@link module:ngMessages Click here} to learn more about `ngMessages` and `ngMessage`.
*
* @param {string} ngMessagesInclude|src a string value corresponding to the remote template.
*/
.directive('ngMessagesInclude',
['$templateRequest', '$document', '$compile', function($templateRequest, $document, $compile) {
return {
restrict: 'AE',
require: '^^ngMessages', // we only require this for validation sake
link: function($scope, element, attrs) {
var src = attrs.ngMessagesInclude || attrs.src;
$templateRequest(src).then(function(html) {
if ($scope.$$destroyed) return;
if (isString(html) && !html.trim()) {
// Empty template - nothing to compile
replaceElementWithMarker(element, src);
} else {
// Non-empty template - compile and link
$compile(html)($scope, function(contents) {
element.after(contents);
replaceElementWithMarker(element, src);
});
}
});
}
};
// Helpers
function replaceElementWithMarker(element, src) {
// A comment marker is placed for debugging purposes
var comment = $compile.$$createComment ?
$compile.$$createComment('ngMessagesInclude', src) :
$document[0].createComment(' ngMessagesInclude: ' + src + ' ');
var marker = jqLite(comment);
element.after(marker);
// Don't pollute the DOM anymore by keeping an empty directive element
element.remove();
}
}])
/**
* @ngdoc directive
* @name ngMessage
* @restrict AE
* @scope
* @priority 1
*
* @description
* `ngMessage` is a directive with the purpose to show and hide a particular message.
* For `ngMessage` to operate, a parent `ngMessages` directive on a parent DOM element
* must be situated since it determines which messages are visible based on the state
* of the provided key/value map that `ngMessages` listens on.
*
* More information about using `ngMessage` can be found in the
* {@link module:ngMessages `ngMessages` module documentation}.
*
* @usage
* ```html
* <!-- using attribute directives -->
* <ANY ng-messages="expression" role="alert">
* <ANY ng-message="stringValue">...</ANY>
* <ANY ng-message="stringValue1, stringValue2, ...">...</ANY>
* </ANY>
*
* <!-- or by using element directives -->
* <ng-messages for="expression" role="alert">
* <ng-message when="stringValue">...</ng-message>
* <ng-message when="stringValue1, stringValue2, ...">...</ng-message>
* </ng-messages>
* ```
*
* @param {expression} ngMessage|when a string value corresponding to the message key.
*/
.directive('ngMessage', ngMessageDirectiveFactory())
/**
* @ngdoc directive
* @name ngMessageExp
* @restrict AE
* @priority 1
* @scope
*
* @description
* `ngMessageExp` is the same as {@link directive:ngMessage `ngMessage`}, but instead of a static
* value, it accepts an expression to be evaluated for the message key.
*
* @usage
* ```html
* <!-- using attribute directives -->
* <ANY ng-messages="expression">
* <ANY ng-message-exp="expressionValue">...</ANY>
* </ANY>
*
* <!-- or by using element directives -->
* <ng-messages for="expression">
* <ng-message when-exp="expressionValue">...</ng-message>
* </ng-messages>
* ```
*
* {@link module:ngMessages Click here} to learn more about `ngMessages` and `ngMessage`.
*
* @param {expression} ngMessageExp|whenExp an expression value corresponding to the message key.
*/
.directive('ngMessageExp', ngMessageDirectiveFactory())
/**
* @ngdoc directive
* @name ngMessageDefault
* @restrict AE
* @scope
*
* @description
* `ngMessageDefault` is a directive with the purpose to show and hide a default message for
* {@link directive:ngMessages}, when none of provided messages matches.
*
* More information about using `ngMessageDefault` can be found in the
* {@link module:ngMessages `ngMessages` module documentation}.
*
* @usage
* ```html
* <!-- using attribute directives -->
* <ANY ng-messages="expression" role="alert">
* <ANY ng-message="stringValue">...</ANY>
* <ANY ng-message="stringValue1, stringValue2, ...">...</ANY>
* <ANY ng-message-default>...</ANY>
* </ANY>
*
* <!-- or by using element directives -->
* <ng-messages for="expression" role="alert">
* <ng-message when="stringValue">...</ng-message>
* <ng-message when="stringValue1, stringValue2, ...">...</ng-message>
* <ng-message-default>...</ng-message-default>
* </ng-messages>
*
*/
.directive('ngMessageDefault', ngMessageDirectiveFactory(true));
function ngMessageDirectiveFactory(isDefault) {
return ['$animate', function($animate) {
return {
restrict: 'AE',
transclude: 'element',
priority: 1, // must run before ngBind, otherwise the text is set on the comment
terminal: true,
require: '^^ngMessages',
link: function(scope, element, attrs, ngMessagesCtrl, $transclude) {
var commentNode, records, staticExp, dynamicExp;
if (!isDefault) {
commentNode = element[0];
staticExp = attrs.ngMessage || attrs.when;
dynamicExp = attrs.ngMessageExp || attrs.whenExp;
var assignRecords = function(items) {
records = items
? (isArray(items)
? items
: items.split(/[\s,]+/))
: null;
ngMessagesCtrl.reRender();
};
if (dynamicExp) {
assignRecords(scope.$eval(dynamicExp));
scope.$watchCollection(dynamicExp, assignRecords);
} else {
assignRecords(staticExp);
}
}
var currentElement, messageCtrl;
ngMessagesCtrl.register(commentNode, messageCtrl = {
test: function(name) {
return contains(records, name);
},
attach: function() {
if (!currentElement) {
$transclude(function(elm, newScope) {
$animate.enter(elm, null, element);
currentElement = elm;
// Each time we attach this node to a message we get a new id that we can match
// when we are destroying the node later.
var $$attachId = currentElement.$$attachId = ngMessagesCtrl.getAttachId();
// in the event that the element or a parent element is destroyed
// by another structural directive then it's time
// to deregister the message from the controller
currentElement.on('$destroy', function() {
// If the message element was removed via a call to `detach` then `currentElement` will be null
// So this handler only handles cases where something else removed the message element.
if (currentElement && currentElement.$$attachId === $$attachId) {
ngMessagesCtrl.deregister(commentNode, isDefault);
messageCtrl.detach();
}
newScope.$destroy();
});
});
}
},
detach: function() {
if (currentElement) {
var elm = currentElement;
currentElement = null;
$animate.leave(elm);
}
}
}, isDefault);
// We need to ensure that this directive deregisters itself when it no longer exists
// Normally this is done when the attached element is destroyed; but if this directive
// gets removed before we attach the message to the DOM there is nothing to watch
// in which case we must deregister when the containing scope is destroyed.
scope.$on('$destroy', function() {
ngMessagesCtrl.deregister(commentNode, isDefault);
});
}
};
}];
function contains(collection, key) {
if (collection) {
return isArray(collection)
? collection.indexOf(key) >= 0
: collection.hasOwnProperty(key);
}
}
}