Attributes of the host element in Angular 1.5 components

I am seeking a way to customize attributes on the host element for Angular 1.5 components.

What is the purpose?

  • I would like to assign a class to a component in order to apply specific styles. For example, if the parent component has display: flex set, I may need to set the flex property on the component as well.
  • It can be beneficial to conditionally add a class based on the component's state.
  • In certain scenarios, utilizing ARIA attributes can enhance the accessibility of a component.

Below is a basic example illustrating what I aim to achieve (though it does not function properly, I am searching for a similar solution):

angular.module("app").component('hello', {

  attributes() {
    return {
      class: "hello " + (this.greeting ? "hello--visibile" : ""),
      data-greeting: this.greeting
    }
  },

  bindings: {
    greeting: "<",
  }
})

Angular 2.0 appears to support this functionality, however, I haven't found any documentation suggesting its availability in version 1.5. Is there a workaround for achieving this within the constraints of .component for those of us still using it?

In the past, I might have used replace: true to address this issue, but that option has been deprecated and is not even supported with .component.

Answer №1

It is worth noting that the direct possibility you mention does not currently exist as described. While an attributes property would be helpful, it has not been implemented thus far.

One potential solution could involve utilizing $element within your controller. This allows for the passing of a jQuery element as a dependency, enabling you to add attributes as required.

angular
    .module('myComponent', [])
    .component('myComponent', {
        bindings: {
                greeting: '<'
        },
        controller: function($element) {
                $element.addClass('hello-world');
                $element.attr('aria-hidden', true);
                $element.data('my-greeting', this.greeting);
        },
        template: 'Define your template here.'
    });

The <myComponent> element will now possess both a hello-world class and an aria-hidden attribute. Furthermore, it is possible to utilize bindings, such as the aforementioned greeting.

It is essential to recognize that the angular component definition essentially serves as a wrapper around standard directives.

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