Is it possible for a custom directive to swap out its element with a template that includes ng-show functionality?

Question

Is it possible for a custom directive to swap out its element with a template that includes ng-show functionality?

I am looking to create a custom hello directive that can be utilized in the following manner:

<hello foo="bar"></hello>

When the foo attribute is set to "bar", I want to substitute the element with

<div ng-show="true"></div>"

; if not, replace it with

<div ng-show="false"></div>"

. However, only the hello element should be replaced, not any of its nested children!

For instance:

<hello foo="bar">
  <h1>Hi everyone!</h1>
</hello>

Should result in:

<div ng-show="true">
  <h1>Hi everyone!</h1>
</div>

Do you think this can be achieved?

javascript angularjs angularjs-directive ng-show

Answer 1

Answer №1

If you want to accomplish this task, consider using transclusion:

JavaScript

app.directive('myDirective', function() {
  return {
    restrict: 'E',
    transclude: true,
    replace: true,
    scope: { data: '@' },
    template: '<div ng-show="data == \'bar\'" ng-transclude></div>',
  };
});

HTML

<myDirective data="bar">
  <h1>Hello everyone!</h1>
</myDirective>

<myDirective data="baz">
  <h1>Hello everybody!</h1>
</myDirective>

Working example on Plunker here.

Answer 2

If you want to accomplish this task, consider using transclusion:

JavaScript

app.directive('myDirective', function() {
  return {
    restrict: 'E',
    transclude: true,
    replace: true,
    scope: { data: '@' },
    template: '<div ng-show="data == \'bar\'" ng-transclude></div>',
  };
});

HTML

<myDirective data="bar">
  <h1>Hello everyone!</h1>
</myDirective>

<myDirective data="baz">
  <h1>Hello everybody!</h1>
</myDirective>

Working example on Plunker here.

Answer 3

Answer №2

Embedding a directive dynamically while compiling or linking another one can be quite tricky. You can't simply set the attribute as Angular may not recognize it. Manual compilation is also not recommended, as it could lead to an infinite loop. However, if you are determined to proceed with this approach, here's how you can do it:

app.directive('hello', function($injector) {
  return {
    transclude: true,
    replace: true,
    restrict: "E",
    template: "<div ng-transclude></div>",
    compile: function(tele, tattrs) {
      var ngShow = $injector.get("ngShowDirective")[0];
      return function(scope, ele, attrs) {
        attrs.$set("ngShow", (attrs.foo === "bar").toString());
        ngShow.link(scope, ele, attrs);
      }
    }
  }
});

The concept here is to manually link the ngShow directive instead of relying on AngularJS to handle it automatically. This code assumes that ngShow has a link function, which might not always be the case. It should be used cautiously as it deviates from the usual Angular behavior.

Check out the demo here

Answer 4

Embedding a directive dynamically while compiling or linking another one can be quite tricky. You can't simply set the attribute as Angular may not recognize it. Manual compilation is also not recommended, as it could lead to an infinite loop. However, if you are determined to proceed with this approach, here's how you can do it:

app.directive('hello', function($injector) {
  return {
    transclude: true,
    replace: true,
    restrict: "E",
    template: "<div ng-transclude></div>",
    compile: function(tele, tattrs) {
      var ngShow = $injector.get("ngShowDirective")[0];
      return function(scope, ele, attrs) {
        attrs.$set("ngShow", (attrs.foo === "bar").toString());
        ngShow.link(scope, ele, attrs);
      }
    }
  }
});

The concept here is to manually link the ngShow directive instead of relying on AngularJS to handle it automatically. This code assumes that ngShow has a link function, which might not always be the case. It should be used cautiously as it deviates from the usual Angular behavior.

Check out the demo here

Answer 5

Answer №3

To hide the hello element based on a model property, you can simply use the ng-show attribute and check the condition in the foo variable.

<hello ng-show="foo == 'bar'">
    <h1>Hi everyone!</h1>
</hello>

Make sure that the foo property is accessible in the scope of this view.

$scope.foo = 'bar';

Answer 6

To hide the hello element based on a model property, you can simply use the ng-show attribute and check the condition in the foo variable.

<hello ng-show="foo == 'bar'">
    <h1>Hi everyone!</h1>
</hello>

Make sure that the foo property is accessible in the scope of this view.

$scope.foo = 'bar';

Is it possible for a custom directive to swap out its element with a template that includes ng-show functionality?

Answer №1

Answer №2

Answer №3

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