Navigating the world of CSS and custom directives in AngularJS can be overwhelming at first, but

Exploring a custom directive in angularjs:

.directive('myDir', function() {
  return {
    restrict: 'E',
    template: "..."
  }
})

When considering the <my-dir></myDir> tag, it appears to lack any default styling (or is not a block tag). My goal is to style it and position it correctly on my page. I have two options:

1) Utilize this template:

.directive('myDir', function() {
  return {
    restrict: 'E',
    template: "<div class="layout">...</div>",
  }
})

And apply css:

.layout {
    /* styles */
}

However, this adds an unnecessary level in the DOM tree. If I were to use

<my-dir class="layout"></my-dir>
with the proper css, it would work but I'd need to remember to add the same class each time I use <my-dir> in my code (not DRY).

2) This led me to consider adding style within the post-link function:

.directive('myDir', function() {
  return {
    restrict: 'E',
    template: "...",
    link: function(scope, element, attrs) {
      element.addClass('layout');
    }
  }
})

Which approach is preferable? Are there any advantages or disadvantages that may not be immediately apparent?

UPDATE:

Using replace: true in the directive definition is no longer recommended. When working with bootstrap, scenarios like

<my-dir class="visible-xs"></my-dir>
can be beneficial.

Answer №1

To address this issue, consider implementing the replace: true option within your directive. This will essentially swap out your directive's DOM with the template specified in the directive.

Your Directive Definition

.directive('myDir', function() {
  return {
    restrict: 'E',
    template: "<div class='layout'>...</div>",
    replace: true //include replace true property
  }
})

Updated HTML Output

<div class="layout">..Content..</div>

As illustrated above, you can eliminate unnecessary HTML tags by utilizing the replace option in your directive implementation.

Check Out Demo on Plunkr

Please Note

While Angular Docs state that the replace option is deprecated in Angular2, you can still make use of it in your scenario.

If you prefer to avoid using the replace option in your directive, another approach is to define your directive as an attribute instead of an element. In this case, move the <div class="layout"> outside and apply your directive like

<div class="layout" my-dir>
. However, keep in mind that transitioning to this method may revert your component structure back to the older Angular style using attribute/class.

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