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POAngularJS: What's the best practice to add ngIf to a directive programmatically?
 

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  1. POAngularJS: What's the best practice to add ngIf to a directive programmatically?
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    <p>I want to create a directive that checks if an element should be present in the dom based on a value coming from a service (e.g. check for a user role).</p> <p>The corresponding directive looks like this:</p> <pre><code>angular.module('app', []).directive('addCondition', function($rootScope) { return { restrict: 'A', compile: function (element, attr) { var ngIf = attr.ngIf, value = $rootScope.$eval(attr.addCondition); /** * Make sure to combine with existing ngIf! * I want to modify the expression to be evalued by ngIf here based on a role * check for example */ if (ngIf) { value += ' &amp;&amp; ' + ngIf; } attr.$set('ng-if', value); } }; }); </code></pre> <p>At the end the element has the ng-if attribute attached but somehow it doesn't apply to the element and it is still existing in the dom. So this is obviously a wrong approach. </p> <p>This fiddle shows the problem: <a href="http://jsfiddle.net/L37tZ/2/">http://jsfiddle.net/L37tZ/2/</a></p> <p>Who can explain why this happens? Is there any other way a similar behaviour could be achieved? Existing ngIfs should be considered.</p> <h1>SOLUTION:</h1> <p>Usage: <code>&lt;div rln-require-roles="['ADMIN', 'USER']"&gt;I'm hidden when theses role requirements are not satifisfied!&lt;/div&gt;</code></p> <pre><code>.directive('rlnRequireRoles', function ($animate, Session) { return { transclude: 'element', priority: 600, terminal: true, restrict: 'A', link: function ($scope, $element, $attr, ctrl, $transclude) { var block, childScope, roles; $attr.$observe('rlnRequireRoles', function (value) { roles = $scope.$eval(value); if (Session.hasRoles(roles)) { if (!childScope) { childScope = $scope.$new(); $transclude(childScope, function (clone) { block = { startNode: clone[0], endNode: clone[clone.length++] = document.createComment(' end rlnRequireRoles: ' + $attr.rlnRequireRoles + ' ') }; $animate.enter(clone, $element.parent(), $element); }); } } else { if (childScope) { childScope.$destroy(); childScope = null; } if (block) { $animate.leave(getBlockElements(block)); block = null; } } }); } }; }); </code></pre> <p>It is very important to add the priority in the directive, otherwise other directives attached to that element are not evaluated!</p>
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