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2013-09-12T05:33:46.697
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2017-05-23T12:12:38.813
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UPDATE I've thought of a better way to answer the question. The old answer is below the new one. <hr> You can get a reference to AngularJS' required directive and apply it to your own. Heres a code sample that will do this: <pre><code>var myApp = angular.module('myApp', []).directive('valRequired', function(requiredDirective) { var newDirective = {}, angularDirective = requiredDirective[0]; //This assumes angular's required directive is the first one //Copy over all other properties of the angular directive angular.extend(newDirective, angularDirective); //Change the name of our directive back to valRequired newDirective.name = 'valRequired'; //Provide our own logic in the linking function newDirective.link = function(scope, element, attr, ctrl){ //Super call angularDirective.link.apply(this, arguments); if(attr.valRequired === 'required'){ attr.$set('ngRequired', 'true'); } else { attr.$set('ngRequired', 'false'); } } return newDirective; }); <input data-val-required="required" ng-model="foo" /> </code></pre> <hr> OLD ANSWER Using jQuery's or jQLite's <code>attr()</code> method does not change <a href="http://docs.angularjs.org/api/ng.$compile.directive.Attributes" rel="nofollow noreferrer">AngularJs' Attributes object</a>. The Attributes object is what directives use as values for their logic. You will also need to include the ng-required attribute, although you will not need to bind any angular expressions to it. This question will help you out there: <a href="https://stackoverflow.com/questions/4844001/html5-data-with-asp-net-mvc-textboxfor-html-attributes">Html5 data-* with asp.net mvc TextboxFor html attributes</a> The reason for this is we need to force angular to apply the directive to this node. Updating the attribute after the compile phase of a template will not notify angular to apply new directives to the node. This should work: <pre><code>var myApp = angular.module('myApp', []).directive('valRequired', function() { return { priority : 101, //The priority needs to run higher than 100 to get around angularjs' default priority for ngRequired link: function (scope, element, attr) { if(attr.valRequired === 'true'){ attr.$set('ngRequired', 'true'); } else { attr.$set('ngRequired', 'false'); } } }; }); <input ng-required data-val-required="true" ng-model="foo" /> </code></pre>
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