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copied!<p>This first one is a directive that evaluates whether something should be in the DOM only once and adds no watch listeners to the page:</p> <pre><code>angular.module('setIf',[]).directive('setIf',function () { return { transclude: 'element', priority: 1000, terminal: true, restrict: 'A', compile: function (element, attr, linker) { return function (scope, iterStartElement, attr) { if(attr.waitFor) { var wait = scope.$watch(attr.waitFor,function(nv,ov){ if(nv) { build(); wait(); } }); } else { build(); } function build() { iterStartElement[0].doNotMove = true; var expression = attr.setIf; var value = scope.$eval(expression); if (value) { linker(scope, function (clone) { iterStartElement.after(clone); clone.removeAttr('set-if'); clone.removeAttr('wait-for'); }); } } }; } }; }); </code></pre> <p>This second one is a directive that conditionally applies attributes to elements only once without watch listeners:</p> <p>i.e.</p> <pre><code><div set-attr="{ data-id : post.id, data-name : { value : post.name, condition : post.name != 'FOO' } }"></div> angular.module('setAttr',[]).directive('setAttr', function() { return { restrict: 'A', priority: 100, link: function(scope,elem,attrs) { if(attrs.setAttr.indexOf('{') != -1 && attrs.setAttr.indexOf('}') != -1) { //you could just angular.isObject(scope.$eval(attrs.setAttr)) for the above but I needed it this way var data = scope.$eval(attrs.setAttr); angular.forEach(data, function(v,k){ if(angular.isObject(v)) { if(v.value && v.condition) { elem.attr(k,v.value); elem.removeAttr('set-attr'); } } else { elem.attr(k,v); elem.removeAttr('set-attr'); } }); } } } }); </code></pre> <p>Of course your can use dynamic versions built into angular:</p> <pre><code><div ng-class="{ 'myclass' : item.iscool }"></div> </code></pre> <p>You can also use the new ng-if added by angularjs which basically replaces ui-if created by the angularui team these will conditionally add and remove things from the DOM and add watch listeners to keep evaluating:</p> <pre><code><div ng-if="item.iscool"></div> </code></pre>

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