"Exploring the functionality of Angular directives' link function

Just starting out with Angular and delving into directives. While working on my directive's link function, I noticed that when I log my element, it shows up as an array. This raised the question in my mind - why is it an array?

<mouse-enter>HI</mouse-enter>

JS:

angular.module('custom.directive').directive('mouseEnter', function () {
    return {
        restrict: 'E',
        link: function (scope, element) {
            console.log(element);// It's logging as an array here!
            element[0].onmouseover = function () {
                console.log('Mouse Entered!');
            };
        }
    }
});

When could this array potentially have a length greater than 1? The mystery deepens!

Answer №1

When jQuery is available, Angular's jQlite selectors serve as an alias for the jQuery function. However, when jQuery is not present, jQlite functions as a smaller subset of jQuery built into Angular.

Both jQlite and jQuery selectors will always return arrays.

https://docs.angularjs.org/api/ng/function/angular.element

Imagine the following DOM structure:

<div id="test">
    <div class="foo bar" id="dom-element-1">Hello</div>
    <p>ignore me</p>
</div>

<span class="foo" id="dom-element-2">Hello again</div>

Now, if you use either $(".foo") or

angular.element(document.querySelectAll(".foo"))
, you will receive a jQlite or jQuery instance containing an array of two DOM elements with IDs dom-element-1 and dom-element-2.

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