What is AngularJs's preference: URL or ID for templateUrl?

When looking at the AngularJS documentation, you will come across an example using the templateUrl property:

In the HTML:

  //ngApp...
 <div ng-controller="Ctrl">
      <div my-customer></div>
    </div>

And in the controller:

....directive('myCustomer', function() {
    return {
      templateUrl: 'my-customer.html'
    };
  })

The file my-customer.html is an external file:

Everything seems to be working fine, but there is also an option to edit it using jsfiddle:

However, in the example provided, it is treated as a template tag:

<div ng-app="docsTemplateUrlDirective">
  <div ng-controller="Ctrl">
    <div my-customer></div>
  </div>



      <!-- my-customer.html -->
      <script type="text/ng-template" id="my-customer.html">
        Name: {{customer.name}} Address: {{customer.address}}
      </script>
    </div>

Question:

How does Angular know whether it's dealing with an external file or an element ID? And is there a way to specify the type?

(p.s. - This information wasn't found in the docs).

Answer №1

Expanding on @QuarK's initial points, I'll delve a bit deeper into the topic.

The $templateCache serves as a storage space for templates that have been resolved, whether they were loaded inline or from an external file.

To provide some context, the source code for the script tag with text/ng-templates appears as follows:

var scriptDirective = ['$templateCache', function($templateCache) {
  return {
    restrict: 'E',
    terminal: true,
    compile: function(element, attr) {
      if (attr.type == 'text/ng-template') {
        var templateUrl = attr.id,
            // Inconsistent handling in IE, requiring different approaches for scripts and other nodes
            text = element[0].text;

        $templateCache.put(templateUrl, text);
      }
    }
  };
}];

If a script tag is located and its attr.type matches text/ng-template, Angular adds the content to the $templateCache under the templateUrl reference.

It's worth noting that the utilization of script tags in this manner is a recent addition to Angular. This approach provides an alternative for defining templates without the need for external files. Nonetheless, at its core, once processed, both methods rely on the same underlying mechanism for reading and compiling ($templateCache).

Trust this sheds light on the matter.

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