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'use strict';
/**
* @ngdoc directive
* @name angular.module.ng.$compileProvider.directive.ngStyle
*
* @description
* The `ngStyle` directive allows you to set CSS style on an HTML element conditionally.
*
* @element ANY
* @param {expression} ngStyle {@link guide/dev_guide.expressions Expression} which evals to an
* object whose keys are CSS style names and values are corresponding values for those CSS
* keys.
*
* @example
<example>
<file name="index.html">
<input type="button" value="set" ng-click="myStyle={color:'red'}">
<input type="button" value="clear" ng-click="myStyle={}">
<br/>
<span ng-style="myStyle">Sample Text</span>
<pre>myStyle={{myStyle}}</pre>
</file>
<file name="style.css">
span {
color: black;
}
</file>
<file name="scenario.js">
it('should check ng-style', function() {
expect(element('.doc-example-live span').css('color')).toBe('rgb(0, 0, 0)');
element('.doc-example-live :button[value=set]').click();
expect(element('.doc-example-live span').css('color')).toBe('rgb(255, 0, 0)');
element('.doc-example-live :button[value=clear]').click();
expect(element('.doc-example-live span').css('color')).toBe('rgb(0, 0, 0)');
});
</file>
</example>
*/
var ngStyleDirective = ngDirective(function(scope, element, attr) {
scope.$watch(attr.ngStyle, function(newStyles, oldStyles) {
if (oldStyles && (newStyles !== oldStyles)) {
forEach(oldStyles, function(val, style) { element.css(style, '');});
}
if (newStyles) element.css(newStyles);
}, true);
});
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