无法在Angular的控制器内获取元素

Question

I am trying to get an element inside an AngularJS controller like this:

var imageInput = document.getElementById("myImage");

It doesn't work, the element is null. However if I move the statement to a function that I bound with ng-click it works. Why? and how do I fix it?

Answer 1

Because it's not rendered for that time. If you write all code, we'll suggest better alternative than working with dom in controller (it's no good for you :) )

Answer 2

Like Karaxuna said, it has not been rendered yet.

Depending on what you are trying to do, you could use a directive to add behavior to your element : http://docs.angularjs.org/guide/directive .

Add some code so we can give you a better answer.

Answer 3

Not only it may have not been rendered in your dom, but also you should inject the $window in your controller and then access the document like this:

    var myCtrl = function($scope,$window) {
       Var document = $window.document
       ...
    }

But you should seek a better way to manipulate your DOM instead of doing so in your controller (eg Writing a directive)