394 lines
14 KiB
JavaScript
394 lines
14 KiB
JavaScript
/**
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* @license AngularJS v1.4.4
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* (c) 2010-2015 Google, Inc. http://angularjs.org
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* License: MIT
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*/
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(function(window, angular, undefined) {'use strict';
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/**
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* @ngdoc module
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* @name ngAria
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* @description
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*
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* The `ngAria` module provides support for common
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* [<abbr title="Accessible Rich Internet Applications">ARIA</abbr>](http://www.w3.org/TR/wai-aria/)
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* attributes that convey state or semantic information about the application for users
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* of assistive technologies, such as screen readers.
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*
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* <div doc-module-components="ngAria"></div>
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*
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* ## Usage
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*
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* For ngAria to do its magic, simply include the module `ngAria` as a dependency. The following
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* directives are supported:
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* `ngModel`, `ngDisabled`, `ngShow`, `ngHide`, `ngClick`, `ngDblClick`, and `ngMessages`.
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*
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* Below is a more detailed breakdown of the attributes handled by ngAria:
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*
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* | Directive | Supported Attributes |
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* |---------------------------------------------|----------------------------------------------------------------------------------------|
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* | {@link ng.directive:ngDisabled ngDisabled} | aria-disabled |
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* | {@link ng.directive:ngShow ngShow} | aria-hidden |
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* | {@link ng.directive:ngHide ngHide} | aria-hidden |
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* | {@link ng.directive:ngDblclick ngDblclick} | tabindex |
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* | {@link module:ngMessages ngMessages} | aria-live |
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* | {@link ng.directive:ngModel ngModel} | aria-checked, aria-valuemin, aria-valuemax, aria-valuenow, aria-invalid, aria-required, input roles |
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* | {@link ng.directive:ngClick ngClick} | tabindex, keypress event, button role |
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*
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* Find out more information about each directive by reading the
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* {@link guide/accessibility ngAria Developer Guide}.
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*
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* ##Example
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* Using ngDisabled with ngAria:
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* ```html
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* <md-checkbox ng-disabled="disabled">
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* ```
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* Becomes:
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* ```html
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* <md-checkbox ng-disabled="disabled" aria-disabled="true">
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* ```
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*
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* ##Disabling Attributes
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* It's possible to disable individual attributes added by ngAria with the
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* {@link ngAria.$ariaProvider#config config} method. For more details, see the
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* {@link guide/accessibility Developer Guide}.
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*/
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/* global -ngAriaModule */
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var ngAriaModule = angular.module('ngAria', ['ng']).
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provider('$aria', $AriaProvider);
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/**
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* @ngdoc provider
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* @name $ariaProvider
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*
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* @description
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*
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* Used for configuring the ARIA attributes injected and managed by ngAria.
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*
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* ```js
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* angular.module('myApp', ['ngAria'], function config($ariaProvider) {
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* $ariaProvider.config({
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* ariaValue: true,
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* tabindex: false
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* });
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* });
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*```
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*
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* ## Dependencies
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* Requires the {@link ngAria} module to be installed.
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*
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*/
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function $AriaProvider() {
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var config = {
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ariaHidden: true,
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ariaChecked: true,
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ariaDisabled: true,
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ariaRequired: true,
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ariaInvalid: true,
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ariaMultiline: true,
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ariaValue: true,
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tabindex: true,
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bindKeypress: true,
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bindRoleForClick: true
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};
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/**
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* @ngdoc method
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* @name $ariaProvider#config
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*
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* @param {object} config object to enable/disable specific ARIA attributes
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*
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* - **ariaHidden** – `{boolean}` – Enables/disables aria-hidden tags
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* - **ariaChecked** – `{boolean}` – Enables/disables aria-checked tags
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* - **ariaDisabled** – `{boolean}` – Enables/disables aria-disabled tags
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* - **ariaRequired** – `{boolean}` – Enables/disables aria-required tags
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* - **ariaInvalid** – `{boolean}` – Enables/disables aria-invalid tags
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* - **ariaMultiline** – `{boolean}` – Enables/disables aria-multiline tags
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* - **ariaValue** – `{boolean}` – Enables/disables aria-valuemin, aria-valuemax and aria-valuenow tags
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* - **tabindex** – `{boolean}` – Enables/disables tabindex tags
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* - **bindKeypress** – `{boolean}` – Enables/disables keypress event binding on `<div>` and
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* `<li>` elements with ng-click
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* - **bindRoleForClick** – `{boolean}` – Adds role=button to non-interactive elements like `div`
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* using ng-click, making them more accessible to users of assistive technologies
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*
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* @description
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* Enables/disables various ARIA attributes
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*/
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this.config = function(newConfig) {
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config = angular.extend(config, newConfig);
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};
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function watchExpr(attrName, ariaAttr, negate) {
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return function(scope, elem, attr) {
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var ariaCamelName = attr.$normalize(ariaAttr);
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if (config[ariaCamelName] && !attr[ariaCamelName]) {
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scope.$watch(attr[attrName], function(boolVal) {
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// ensure boolean value
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boolVal = negate ? !boolVal : !!boolVal;
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elem.attr(ariaAttr, boolVal);
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});
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}
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};
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}
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/**
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* @ngdoc service
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* @name $aria
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*
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* @description
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* @priority 200
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*
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* The $aria service contains helper methods for applying common
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* [ARIA](http://www.w3.org/TR/wai-aria/) attributes to HTML directives.
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*
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* ngAria injects common accessibility attributes that tell assistive technologies when HTML
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* elements are enabled, selected, hidden, and more. To see how this is performed with ngAria,
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* let's review a code snippet from ngAria itself:
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*
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*```js
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* ngAriaModule.directive('ngDisabled', ['$aria', function($aria) {
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* return $aria.$$watchExpr('ngDisabled', 'aria-disabled');
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* }])
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*```
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* Shown above, the ngAria module creates a directive with the same signature as the
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* traditional `ng-disabled` directive. But this ngAria version is dedicated to
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* solely managing accessibility attributes. The internal `$aria` service is used to watch the
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* boolean attribute `ngDisabled`. If it has not been explicitly set by the developer,
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* `aria-disabled` is injected as an attribute with its value synchronized to the value in
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* `ngDisabled`.
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*
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* Because ngAria hooks into the `ng-disabled` directive, developers do not have to do
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* anything to enable this feature. The `aria-disabled` attribute is automatically managed
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* simply as a silent side-effect of using `ng-disabled` with the ngAria module.
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*
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* The full list of directives that interface with ngAria:
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* * **ngModel**
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* * **ngShow**
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* * **ngHide**
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* * **ngClick**
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* * **ngDblclick**
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* * **ngMessages**
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* * **ngDisabled**
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*
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* Read the {@link guide/accessibility ngAria Developer Guide} for a thorough explanation of each
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* directive.
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*
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*
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* ## Dependencies
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* Requires the {@link ngAria} module to be installed.
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*/
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this.$get = function() {
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return {
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config: function(key) {
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return config[key];
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},
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$$watchExpr: watchExpr
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};
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};
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}
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ngAriaModule.directive('ngShow', ['$aria', function($aria) {
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return $aria.$$watchExpr('ngShow', 'aria-hidden', true);
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}])
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.directive('ngHide', ['$aria', function($aria) {
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return $aria.$$watchExpr('ngHide', 'aria-hidden', false);
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}])
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.directive('ngModel', ['$aria', function($aria) {
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function shouldAttachAttr(attr, normalizedAttr, elem) {
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return $aria.config(normalizedAttr) && !elem.attr(attr);
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}
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function shouldAttachRole(role, elem) {
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return !elem.attr('role') && (elem.attr('type') === role) && (elem[0].nodeName !== 'INPUT');
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}
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function getShape(attr, elem) {
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var type = attr.type,
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role = attr.role;
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return ((type || role) === 'checkbox' || role === 'menuitemcheckbox') ? 'checkbox' :
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((type || role) === 'radio' || role === 'menuitemradio') ? 'radio' :
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(type === 'range' || role === 'progressbar' || role === 'slider') ? 'range' :
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(type || role) === 'textbox' || elem[0].nodeName === 'TEXTAREA' ? 'multiline' : '';
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}
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return {
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restrict: 'A',
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require: '?ngModel',
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priority: 200, //Make sure watches are fired after any other directives that affect the ngModel value
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compile: function(elem, attr) {
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var shape = getShape(attr, elem);
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return {
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pre: function(scope, elem, attr, ngModel) {
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if (shape === 'checkbox' && attr.type !== 'checkbox') {
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//Use the input[checkbox] $isEmpty implementation for elements with checkbox roles
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ngModel.$isEmpty = function(value) {
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return value === false;
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};
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}
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},
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post: function(scope, elem, attr, ngModel) {
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var needsTabIndex = shouldAttachAttr('tabindex', 'tabindex', elem);
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function ngAriaWatchModelValue() {
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return ngModel.$modelValue;
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}
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function getRadioReaction() {
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if (needsTabIndex) {
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needsTabIndex = false;
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return function ngAriaRadioReaction(newVal) {
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var boolVal = (attr.value == ngModel.$viewValue);
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elem.attr('aria-checked', boolVal);
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elem.attr('tabindex', 0 - !boolVal);
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};
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} else {
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return function ngAriaRadioReaction(newVal) {
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elem.attr('aria-checked', (attr.value == ngModel.$viewValue));
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};
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}
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}
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function ngAriaCheckboxReaction() {
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elem.attr('aria-checked', !ngModel.$isEmpty(ngModel.$viewValue));
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}
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switch (shape) {
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case 'radio':
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case 'checkbox':
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if (shouldAttachRole(shape, elem)) {
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elem.attr('role', shape);
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}
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if (shouldAttachAttr('aria-checked', 'ariaChecked', elem)) {
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scope.$watch(ngAriaWatchModelValue, shape === 'radio' ?
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getRadioReaction() : ngAriaCheckboxReaction);
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}
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break;
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case 'range':
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if (shouldAttachRole(shape, elem)) {
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elem.attr('role', 'slider');
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}
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if ($aria.config('ariaValue')) {
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var needsAriaValuemin = !elem.attr('aria-valuemin') &&
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(attr.hasOwnProperty('min') || attr.hasOwnProperty('ngMin'));
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var needsAriaValuemax = !elem.attr('aria-valuemax') &&
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(attr.hasOwnProperty('max') || attr.hasOwnProperty('ngMax'));
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var needsAriaValuenow = !elem.attr('aria-valuenow');
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if (needsAriaValuemin) {
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attr.$observe('min', function ngAriaValueMinReaction(newVal) {
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elem.attr('aria-valuemin', newVal);
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});
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}
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if (needsAriaValuemax) {
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attr.$observe('max', function ngAriaValueMinReaction(newVal) {
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elem.attr('aria-valuemax', newVal);
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});
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}
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if (needsAriaValuenow) {
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scope.$watch(ngAriaWatchModelValue, function ngAriaValueNowReaction(newVal) {
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elem.attr('aria-valuenow', newVal);
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});
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}
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}
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break;
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case 'multiline':
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if (shouldAttachAttr('aria-multiline', 'ariaMultiline', elem)) {
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elem.attr('aria-multiline', true);
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}
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break;
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}
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if (needsTabIndex) {
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elem.attr('tabindex', 0);
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}
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if (ngModel.$validators.required && shouldAttachAttr('aria-required', 'ariaRequired', elem)) {
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scope.$watch(function ngAriaRequiredWatch() {
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return ngModel.$error.required;
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}, function ngAriaRequiredReaction(newVal) {
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elem.attr('aria-required', !!newVal);
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});
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}
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if (shouldAttachAttr('aria-invalid', 'ariaInvalid', elem)) {
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scope.$watch(function ngAriaInvalidWatch() {
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return ngModel.$invalid;
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}, function ngAriaInvalidReaction(newVal) {
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elem.attr('aria-invalid', !!newVal);
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});
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}
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}
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};
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}
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};
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}])
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.directive('ngDisabled', ['$aria', function($aria) {
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return $aria.$$watchExpr('ngDisabled', 'aria-disabled');
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}])
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.directive('ngMessages', function() {
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return {
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restrict: 'A',
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require: '?ngMessages',
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link: function(scope, elem, attr, ngMessages) {
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if (!elem.attr('aria-live')) {
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elem.attr('aria-live', 'assertive');
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}
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}
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};
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})
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.directive('ngClick',['$aria', '$parse', function($aria, $parse) {
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return {
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restrict: 'A',
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compile: function(elem, attr) {
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var fn = $parse(attr.ngClick, /* interceptorFn */ null, /* expensiveChecks */ true);
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return function(scope, elem, attr) {
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var nodeBlackList = ['BUTTON', 'A', 'INPUT', 'TEXTAREA'];
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function isNodeOneOf(elem, nodeTypeArray) {
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if (nodeTypeArray.indexOf(elem[0].nodeName) !== -1) {
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return true;
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}
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}
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if ($aria.config('bindRoleForClick')
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&& !elem.attr('role')
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&& !isNodeOneOf(elem, nodeBlackList)) {
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elem.attr('role', 'button');
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}
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if ($aria.config('tabindex') && !elem.attr('tabindex')) {
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elem.attr('tabindex', 0);
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}
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if ($aria.config('bindKeypress') && !attr.ngKeypress && !isNodeOneOf(elem, nodeBlackList)) {
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elem.on('keypress', function(event) {
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var keyCode = event.which || event.keyCode;
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if (keyCode === 32 || keyCode === 13) {
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scope.$apply(callback);
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}
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function callback() {
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fn(scope, { $event: event });
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}
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});
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}
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};
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}
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};
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}])
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.directive('ngDblclick', ['$aria', function($aria) {
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return function(scope, elem, attr) {
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if ($aria.config('tabindex') && !elem.attr('tabindex')) {
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elem.attr('tabindex', 0);
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}
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};
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}]);
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})(window, window.angular);
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