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  1. PO
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    <p>Those are all examples of services that aid in AngularJS view rendering (although <code>$parse</code> and <code>$interpolate</code> could be used outside of this domain). To illustrate what is the role of each service let's take example of this piece of HTML:</p> <pre><code>var imgHtml = '&lt;img ng-src="/path/{{name}}.{{extension}}"&gt;' </code></pre> <p>and values on the scope:</p> <pre><code>$scope.name = 'image'; $scope.extension = 'jpg'; </code></pre> <p>Given this markup here is what each service brings to the table:</p> <ul> <li><code>$compile</code> - it can take the whole markup and turn it into a linking function that, when executed against a certain scope will turn a piece of HTML text into dynamic, live DOM with all the directives (here: <code>ng-src</code>) reacting to model changes. One would invoke it as follows: $compile(imgHtml)($scope) and would get a DOM element with all the DOM event bounds as a result. <code>$compile</code> is making use of <code>$interpolate</code> (among other things) to do its job.</li> <li><code>$interpolate</code> knows how to process a string with embedded interpolation expressions, ex.: <code>/path/{{name}}.{{extension}}</code>. In other words it can take a string with interpolation expressions, a scope and turn it into the resulting text. One can think of the <code>$interpolation</code> service as a very simple, string-based template language. Given the above example one would use this service like: <code>$interpolate("/path/{{name}}.{{extension}}")($scope)</code> to get the <code>path/image.jpg</code> string as a result.</li> <li><code>$parse</code> is used by <code>$interpolate</code> to evaluate individual expressions (<code>name</code>, <code>extension</code>) against a scope. It can be used to both <em>read</em> and <em>set</em> values for a given expression. For example, to evaluate the <code>name</code> expression one would do: <code>$parse('name')($scope)</code> to get the "image" value. To set the value one would do: <code>$parse('name').assign($scope, 'image2')</code></li> </ul> <p>All those services are working together to provide a live UI in AngularJS. But they operate on different levels:</p> <ul> <li><code>$parse</code> is concerned with individual expressions only (<code>name</code>, <code>extension</code>). It is a read-write service.</li> <li><code>$interpolate</code> is read only and is concerned with strings containing multiple expressions (<code>/path/{{name}}.{{extension}}</code>)</li> <li><code>$compile</code> is at the heart of AngularJS machinery and can turn HTML strings (with directives and interpolation expressions) into live DOM.</li> </ul>
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    1. POWhat is the difference between the $parse, $interpolate and $compile services?
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    1. USghickman
    1. USpkozlowski.opensource
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    1. POWhat is the difference between the $parse, $interpolate and $compile services?
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    1. VO
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    1. CONicely explained. Voted Up! :)
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      1. USAlwaysALearner
    2. COVery nice indeed!
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      1. USThalis K.
 

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