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POAngular directive with default options
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  1. POAngular directive with default options
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    copied!<p>I'm just starting with angularjs, and am working on converting a few old JQuery plugins to Angular directives. I'd like to define a set of default options for my (element) directive, which can be overridden by specifying the option value in an attribute.</p> <p>I've had a look around for the way others have done this, and in the <a href="http://angular-ui.github.io">angular-ui</a> library the <a href="https://github.com/angular-ui/bootstrap/blob/master/src/pagination/pagination.js">ui.bootstrap.pagination</a> seems to do something similar.</p> <p>First all default options are defined in a constant object:</p> <pre><code>.constant('paginationConfig', { itemsPerPage: 10, boundaryLinks: false, ... }) </code></pre> <p>Then a <code>getAttributeValue</code> utility function is attached to the directive controller:</p> <pre><code>this.getAttributeValue = function(attribute, defaultValue, interpolate) { return (angular.isDefined(attribute) ? (interpolate ? $interpolate(attribute)($scope.$parent) : $scope.$parent.$eval(attribute)) : defaultValue); }; </code></pre> <p>Finally, this is used in the linking function to read in attributes as</p> <pre><code>.directive('pagination', ['$parse', 'paginationConfig', function($parse, config) { ... controller: 'PaginationController', link: function(scope, element, attrs, paginationCtrl) { var boundaryLinks = paginationCtrl.getAttributeValue(attrs.boundaryLinks, config.boundaryLinks); var firstText = paginationCtrl.getAttributeValue(attrs.firstText, config.firstText, true); ... } }); </code></pre> <p>This seems like a rather complicated setup for something as standard as wanting to replace a set of default values. Are there any other ways to do this that are common? Or is it normal to always define a utility function such as <code>getAttributeValue</code> and parse options in this way? I'm interested to find out what different strategies people have for this common task.</p> <p>Also, as a bonus, I'm not clear why the <code>interpolate</code> parameter is required.</p>
 

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