1

why in this script:

<html>
    <head>
        <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
        <script>
        var app = angular.module( "test", [] );  

        app.run(
            angular.element.prototype.test = function ( ) {
                alert ( "da" );
            }
        );

        app.directive('cacat', function() {
            return {
                restrict: 'E',
                link: function (scope, element, attrs) {
                }
            };
        });
        </script>
    </head>
    <body ng-app="test">
        <cacat></cacat>
    </body>
</html>

function test is called? I want this function called only when I want.

Answer

        app.run(
            function () {
                angular.element.prototype.test = function ( ) {
                    alert ( "da" );
                }
            }
        );
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7
  • why I haven't other details. mentioned 7 times?
    – Pankaj Parkar
    Commented Jan 8, 2016 at 21:42
  • is angular.element.prototype a common way to interact with angular?
    – dandavis
    Commented Jan 8, 2016 at 21:43
  • @PankajParkar , stackoverflow says: You have more code than information, what more information?
    – user3032469
    Commented Jan 8, 2016 at 21:44
  • @dandavis Yes, angular.element -> JQLite
    – user3032469
    Commented Jan 8, 2016 at 21:44
  • @PankajParkar Maybe to meet the minimum length requirement for a post.
    – micah
    Commented Jan 8, 2016 at 21:46

1 Answer 1

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4

Assignment statements can be evaluated to their values. If you do something like

var x = false;
if(x = true) { /*Some code here*/ }

x is assigned, then evaluated, in the if statement.

In your sample,

app.run(angular.element.prototype.test = function ( ) {
            alert ( "da" );
        })

evaluates the function that you assigned to angular.element.prototype.test, effectively passing that function to app.run(). app.run() takes it and, as one would expect, runs it.

If you simply wanted it to make the assignment in the run() execution, you need to instead pass it a function that does that, like this:

app.run(function(){
    angular.element.prototype.test = function ( ) {
        alert ( "da" );
    });
});
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2
  • I just putted that function in another function, and it works
    – user3032469
    Commented Jan 8, 2016 at 22:01
  • Great, that's exactly how it should be. If this answered your question, you should mark it as the answer so people will know it's resolved.
    – Harris
    Commented Jan 8, 2016 at 22:02

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