Unique text: "Enhancing User Interaction: Using a custom directive to dynamically evaluate

Question

Unique text: "Enhancing User Interaction: Using a custom directive to dynamically evaluate

Introduction:

A simple demonstration of HTML structure:

<td ng-repeat="col in cols">
    <div ng-bind-html="col.safeHTML"></div>
</td>

JavaScript controller code snippet:

$scope.cols = [
    {
      field       : 'logo',
      displayName : 'Logo',
      cellTemplate: '<div style="color:red">{{col}}</div>'
    },
    {
      field       : 'color',
      displayName : 'Color',
      cellTemplate: '<div style="color:green">{{col}}</div>
    }
  ];

Linking the directive with JavaScript using link function:

        for (var i = 0, j = $scope.cols.length;
               i < j;
               i++) {

            if ($scope.cols[i].hasOwnProperty('cellTemplate')) {
              $scope.cols[i].safeHTML = $sce.trustAsHtml($scope.cols[i].cellTemplate);
            }
          }

Although the HTML is being properly escaped, the dynamic bindings like {{some_var}} are not getting processed. How can we ensure Angular evaluates the bindings within the safe HTML content? I've attempted to utilize different binding methods such as ngBindTemplate without success :(

javascript angularjs angularjs-directive eval

Answer 1

Answer №1

If you are looking to dynamically compile Angular components and manually add them to the DOM, it is recommended to utilize the $compile service.

By incorporating some custom directive work, achieving this functionality can be quite straightforward.

function dynamicCompile($compile) {

  return {
    restrict: 'A',
    link: function(scope, elem, attrs) {
      // Monitor changes in expression
      scope.$watch(attrs.dynamicCompile, function(newVal) {

        // Compile generates a linking function
        // that can be used with any scope
        var link = $compile(newVal);

        // Executing the linking function
        // creates a new element
        var newElem = link(scope);

        // We can then append this new element to our existing DOM element
        elem.append(newElem);
      });
    }
  };

}


function columnsCtrl() {
  this.columns = [{
    name: "Heading with H1 tag",
    template: "<h1>{{column.name}}</h1>"
  }, {
    name: "Text in red span",
    template: "<span style=\"color:red\">{{column.name}}</span>"
  }];
}

angular.module('sample', [])
  .directive('dynamicCompile', dynamicCompile)
  .controller('columnsController', columnsCtrl);

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.0-beta.4/angular.min.js"></script>
<div ng-app="sample">

  <ul ng-controller="columnsController as ctrl">
    <li ng-repeat="column in ctrl.columns">
      <!-- The "dynamic-compile" attribute is our custom directive -->
      <div dynamic-compile="column.template"></div>
    </li>
  </ul>

</div>

Answer 2

If you are looking to dynamically compile Angular components and manually add them to the DOM, it is recommended to utilize the $compile service.

By incorporating some custom directive work, achieving this functionality can be quite straightforward.

function dynamicCompile($compile) {

  return {
    restrict: 'A',
    link: function(scope, elem, attrs) {
      // Monitor changes in expression
      scope.$watch(attrs.dynamicCompile, function(newVal) {

        // Compile generates a linking function
        // that can be used with any scope
        var link = $compile(newVal);

        // Executing the linking function
        // creates a new element
        var newElem = link(scope);

        // We can then append this new element to our existing DOM element
        elem.append(newElem);
      });
    }
  };

}


function columnsCtrl() {
  this.columns = [{
    name: "Heading with H1 tag",
    template: "<h1>{{column.name}}</h1>"
  }, {
    name: "Text in red span",
    template: "<span style=\"color:red\">{{column.name}}</span>"
  }];
}

angular.module('sample', [])
  .directive('dynamicCompile', dynamicCompile)
  .controller('columnsController', columnsCtrl);

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.0-beta.4/angular.min.js"></script>
<div ng-app="sample">

  <ul ng-controller="columnsController as ctrl">
    <li ng-repeat="column in ctrl.columns">
      <!-- The "dynamic-compile" attribute is our custom directive -->
      <div dynamic-compile="column.template"></div>
    </li>
  </ul>

</div>

Unique text: "Enhancing User Interaction: Using a custom directive to dynamically evaluate

Answer №1

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