Exploring Angular's ng-transclude directive within a repeat loop

Question

Exploring Angular's ng-transclude directive within a repeat loop

Recently, I began delving into AngularJS and attempted to create a custom table directive with multiple slots for transclusion. However, I encountered an issue where the scope was not being passed to the transclude. Although there are various solutions available on StackOverflow, none of them seem to work in my specific case where an ng-repeat is not present for the top element in the directive template. I am struggling to adapt these solutions to fit my requirements.

Here is a simplified version of the directive:

<span>
  <div>Some pagination</div>
  <div style="display: inline"><input type="text" placeholder="Search"/></div>
  <div style="display: inline">Some filters</div>

  <table>
    <tbody>
      <tr ng-repeat="line in lines" ng-transclude="row">
      </tr>
    </tbody>
  </table>

  <div>Some pagination again</div>
</span>

Usage of the directive:

<my-table>
     <row>
          <td>{{line.col1}}</td>
          <td>{{line.col2}}</td>
      </row>
</my-table>

View the full example and script on Plunkr: https://plnkr.co/edit/rg43ZdPMGHLBJCTLOoLC

Any guidance would be greatly appreciated.

javascript angularjs

Answer 1

Answer №1

If you want to access the $scope object created by the ng-repeat directly in a transcluded template, one way to do so is by using the $parent property:

<my-table>
  <td>{{$parent.line.col1}}</td>
  <td>{{$parent.line.col2}}</td>
</my-table>

The $parent property of the $scope created for a transcluded template refers to the $scope of the target template where the transcluded template is ultimately placed (in this case, the ng-repeat), even if the transcluded $scope is not a direct child of the target $scope due to transclusion. For more information on this topic, you can read this informative blog post.

You can see this concept in action in this working Plunkr example: https://plnkr.co/edit/LoqIMiQVZKlTt5epDnZF?p=preview.

Answer 2

If you want to access the $scope object created by the ng-repeat directly in a transcluded template, one way to do so is by using the $parent property:

<my-table>
  <td>{{$parent.line.col1}}</td>
  <td>{{$parent.line.col2}}</td>
</my-table>

The $parent property of the $scope created for a transcluded template refers to the $scope of the target template where the transcluded template is ultimately placed (in this case, the ng-repeat), even if the transcluded $scope is not a direct child of the target $scope due to transclusion. For more information on this topic, you can read this informative blog post.

You can see this concept in action in this working Plunkr example: https://plnkr.co/edit/LoqIMiQVZKlTt5epDnZF?p=preview.

Answer 3

Answer №2

To properly utilize the $transclude function and establish a new child scope for each line, it is imperative to manually handle these functions in your directive implementation. Additionally, when working with an isolated scope, make sure to pass lines as needed. The linking function should be structured similar to the following example:

link: function($scope, $element, $attrs, controller, $transclude) {
      var tbody = $element.find('tbody');

      $scope.$watch('lines', function (lines) {
        tbody.empty();

        lines.forEach(function (line) {
          var childScope = $scope.$new();
          childScope.line = line;

          $transclude(childScope, function (content) {
            tbody.append('<tr>');
            tbody.append(content);
            tbody.append('</tr>');
          }, null,  'row');
        });
      });
    }

Check out this Plunker for a live demo: https://plnkr.co/edit/MLNZOmoQyMazgIpluMqO?p=preview

However, this approach can be cumbersome as creating tables using this method involves intricate DOM manipulation. The structure may not easily align with the desired table layout due to limitations imposed by the transclusion process.

Answer 4

To properly utilize the $transclude function and establish a new child scope for each line, it is imperative to manually handle these functions in your directive implementation. Additionally, when working with an isolated scope, make sure to pass lines as needed. The linking function should be structured similar to the following example:

link: function($scope, $element, $attrs, controller, $transclude) {
      var tbody = $element.find('tbody');

      $scope.$watch('lines', function (lines) {
        tbody.empty();

        lines.forEach(function (line) {
          var childScope = $scope.$new();
          childScope.line = line;

          $transclude(childScope, function (content) {
            tbody.append('<tr>');
            tbody.append(content);
            tbody.append('</tr>');
          }, null,  'row');
        });
      });
    }

Check out this Plunker for a live demo: https://plnkr.co/edit/MLNZOmoQyMazgIpluMqO?p=preview

However, this approach can be cumbersome as creating tables using this method involves intricate DOM manipulation. The structure may not easily align with the desired table layout due to limitations imposed by the transclusion process.

Answer 5

Answer №3

It's not necessary to use attributes to simplify and clean up the code:

<body ng-controller="tableCtrl">
   <h1>Table test</h1>
   <my-table lines="lines"></my-table>
 </body>

Your template:

<span>
      <div>Some pagination</div>
      <div style="display: inline"><input type="text" placeholder="Search"/></div>
      <div style="display: inline">Some filters</div>

      <table>
        <tbody>
          <tr ng-repeat="line in lines">
               <td>{{line.col1}}</td>
               <td>{{line.col2}}</td>
          </tr>
        </tbody>
      </table>

      <div>Some pagination again</div>
    </span>

Angular directive:

angular.module('myApp', [])
.directive("myTable", function() {
  return {
    restrict: 'E',
    transclude: true,
    scope: {
      lines:'=lines',
      api: '@'
    },
    templateUrl: "template.html",
  };
})
.controller("tableCtrl", ['$scope', function($scope) {
  $scope.lines = [
    {col1: "testCol1", col2: "testCol2"},
    {col1: "testCol11", col2: "testCol21"}
    ];
}]);

Check out a working example on Plunkr: https://plnkr.co/edit/iMxRoD0N3sUXqmViHAQh?p=preview

Answer 6

It's not necessary to use attributes to simplify and clean up the code:

<body ng-controller="tableCtrl">
   <h1>Table test</h1>
   <my-table lines="lines"></my-table>
 </body>

Your template:

<span>
      <div>Some pagination</div>
      <div style="display: inline"><input type="text" placeholder="Search"/></div>
      <div style="display: inline">Some filters</div>

      <table>
        <tbody>
          <tr ng-repeat="line in lines">
               <td>{{line.col1}}</td>
               <td>{{line.col2}}</td>
          </tr>
        </tbody>
      </table>

      <div>Some pagination again</div>
    </span>

Angular directive:

angular.module('myApp', [])
.directive("myTable", function() {
  return {
    restrict: 'E',
    transclude: true,
    scope: {
      lines:'=lines',
      api: '@'
    },
    templateUrl: "template.html",
  };
})
.controller("tableCtrl", ['$scope', function($scope) {
  $scope.lines = [
    {col1: "testCol1", col2: "testCol2"},
    {col1: "testCol11", col2: "testCol21"}
    ];
}]);

Check out a working example on Plunkr: https://plnkr.co/edit/iMxRoD0N3sUXqmViHAQh?p=preview

Exploring Angular's ng-transclude directive within a repeat loop

Answer №1

Answer №2

Answer №3

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