AngularJS document object model selector

My custom directives use jQuery for animation effects because I find angular's built-in ngShow/ngHide to be functional but not visually appealing. I vaguely remember reading in the documentation that Angular has its own DOM selector, something like angular.export() or angular.select(), which is recommended over using $(SELECTOR). However, I am struggling to locate this information now.

This is how I have implemented it:

//view
<div scroll-to="element"> //`element` is set via ng-click
  …
</div>

//directive
link: function(scope, elm, attrs)
{

  scope.$watch(attrs.scrollTo, function scrollToAction(newValue,oldValue)
  {
    if ( newValue !== oldValue )
    {
      elm.animate({
        scrollTop:
          $('#'+newValue).offset().top //replace jquery selector with angular's
          - elm.offset().top
          + elm.scrollTop()
      });
    }
  });

}

I believe that by only retrieving information about $('#'+newValue) and not manipulating it directly, I am not violating any Angular principles.

Answer №1

According to the official documentation for AngularJs

The documentation emphasizes that all element references in Angular are consistently wrapped with either jQuery or jqLite, and are never presented as raw DOM references within the framework.

To elaborate further: if you have included jQuery before referencing Angular, the angular.element() function will essentially be interchangeable with jQuery (otherwise defaulting to jqLite as per Mark Rajcok's explanation).


You can ascertain whether your environment is leveraging jQuery or jqLite by setting a breakpoint at the line where angular.element() is called in the Dev Tool debugger. Upon hovering over it, the relevant library information will be displayed (as shown in the screenshot below; in my case, jQuery is utilized).

https://i.sstatic.net/mHdZt.png


As reiterated in the official AngularJs documentation

Instead of using tag name lookups directly, consider utilizing

angular.element(document).find(...)
or $document.find()

In simpler terms: if angular.element() returns jQuery, constructions like angular.element('#foo > bar') are valid mechanisms for action.


If you're contemplating how to adopt this selector functionality without relying on jQuery, you might want to explore Sizzlejs. Sizzle serves as the underlying selector library employed by jQuery.

Answer №2

The "jqLite" library, which can be found on the angular.element page, offers various DOM traversal methods such as children(), parent(), contents(), find(), and next() (excluding previous()). However, it does not include a selector-like method.

If you are looking for a selector-like method, consider using JavaScript's querySelector.

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