Different techniques for structuring the template of an AngularJS directive

I am currently exploring different ways to structure templates within AngularJS directives. Two of the most common methods include:

Inline Formatting:

// Directive.js
app.directive('flipCard', [
  function() {
    return {
      template:
        "<div class='cardslot' ng-class='{\"switch\":shouldFlip}'> \
          <card-side candidate-model='currentCandidate' class='card-a-side'></card-side> \
          <card-side candidate-model='nextCandidate' class='card-b-side'></card-side> \
        </div>"
    };
  }
]);

Advantages:

  • Consolidates all directive code into one file for a cleaner look
  • Avoids the need to load an additional file at runtime

Disadvantages:

  • Difficult to format and tends to be less visually appealing
  • Lacks code completion and tag highlighting features
  • Nesting double and single quotes can lead to complications

External Formatting:

// Directive.js
app.directive('directive', [
  function() {
    return {
      templateUrl: '/views/partials/directive.html'
    };
  }
]);

// Directive.html
<div class="cardslot" ng-class="{'switch':shouldFlip}">
  <card-side candidate-model="currentCandidate" class="card-a-side"></card-side>
  <card-side candidate-model="nextCandidate" class="card-b-side"></card-side>
</div>

Advantages:

  • Cleaner formatting with improved code highlighting and completion
  • Separates HTML template from JavaScript, resulting in cleaner directive code

Disadvantages:

  • Requires an additional file per directive, both during coding and at runtime
  • Might feel excessive for smaller template codes

With pros and cons on both sides, how do we decide between inline and external formatting? And are there alternative methods worth considering?

Answer №1

In my project, I like to mix things up a bit and do both methods simultaneously ;) :

  • During development : I find it beneficial to have individual files for each template (and even organize them in module subfolders if necessary) as it makes maintenance and readability much easier.

  • During runtime/packaging-build : I rely on html2js to dynamically replace the templateUrl string with the actual template content.

This approach leads to more verbose code, optimized generated code, reduces HTTP requests, allows for cached templates, and so much more...

Answer №2

One alternative approach, which I personally find more appealing, is to utilize templateUrl in order to reference the id of a specific element within your existing code. In my humble opinion, this method aligns better with Angular's declarative style.

<div ng-app="pageModule"
    ng-controller="parentCtrl">
    <script type="text/ng-template" id="myTemplate">
        <span ng-click="remove()">{{label}}</span>
    </script>
    <div my-directive></div>
</div>



var pageModule = angular.module('pageModule',[])
.controller('parentCtrl',function($scope) {
})
.directive('myDirective',function() {
    return {
        restrict : 'A',
        templateUrl : 'myTemplate'

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