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    <p><strong>Warning</strong>: This is just an <em>idea</em> that works in a trivial example. I'm not saying it's wrong (this is open to discussion, though) but I have NOT used it in a more complicated context.</p> <p>So... you can actually create a second <code>input</code> directive and have it applied only when another directive (let's say <code>myDirective</code>) has been applied to the enclosing form.</p> <p>Suppose you have 2 forms:</p> <pre><code>&lt;body&gt; &lt;form name="myForm1" ng-controller="MainCtrl"&gt; Name: &lt;input id="name1" type="text" ng-model="data.name" /&gt;&lt;br/&gt; Surname: &lt;input id="surname1" type="text" ng-model="data.surname" /&gt; &lt;pre&gt;{{data}}&lt;/pre&gt; &lt;/form&gt; &lt;br/&gt; &lt;form name="myForm2" ng-controller="MainCtrl" my-directive&gt; Name: &lt;input id="name2" type="text" ng-model="data.name" /&gt;&lt;br/&gt; Surname: &lt;input id="surname2" type="text" ng-model="data.surname" /&gt; &lt;pre&gt;{{data}}&lt;/pre&gt; &lt;/form&gt; &lt;/body&gt; </code></pre> <p>Only the second form is <em>tagged</em> with <code>my-directive</code>. Now, your directives could look like:</p> <pre><code>app.directive("myDirective", function(){ return { restrict: 'A', require: ['form'], controller: function() { // nothing here }, link: function(scope, ele, attrs, controllers){ var formCtrl = controllers[0]; console.log("myDirective applied to form:", formCtrl.$name); } }; }); app.directive("input", function(){ return { restrict: 'E', priority: -1000, require: '^?myDirective', link: function(scope, ele, attrs, ctrl){ if (ctrl) { console.log("applying custom behaviour to input: ", ele.attr('id')); // ... awesomeness here } } }; }); </code></pre> <p>See it <a href="http://plnkr.co/edit/Jv74RPmh5BlALWA6Jz0T?p=preview" rel="nofollow">live</a> and check out the logs. The original <code>input</code> directive lives side-by-side with your own. The proof for that is that the form still works (as you type, the model is updated: that's <code>input</code>'s and then, <code>ngModel</code>'s job).</p> <p>Your <code>input</code> directive could also use ngModel to manipulate the input value:</p> <pre><code>app.directive("input", function(){ return { restrict: 'E', priority: -1000, require: ['?ngModel', '^?myDirective'], link: function(scope, ele, attrs, ctrls){ var ngModel = ctrls[0]; var myDirective = ctrls[1]; if (myDirective) { console.log("applying custom behaviour to input: ", ele.attr('id')); // ... awesomeness here } } }; }); </code></pre>
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