angularjs – using {{}} binding inside ng-src but ng-src doesn't load

All we need is an easy explanation of the problem, so here it is.

I have been trying to bind a value to the ng-src of an img HTML element to no avail.

HTML code:

<div ng-controller='footerCtrl'>
<a href="#" rel="nofollow noreferrer noopener"><img ng-src="{{avatar_url}}"/></a>
</div>

AngularJS code:

app.controller('footerCtrl',function($scope, userServices)
{
$scope.avatar_url='';
$scope.$on('updateAvatar', function()
{$scope.avatar_url = userServices.getAvatar_url();}
);
}

app.factory('userServices', function($rootScope){ 
var avatar_url='';
return{  setAvatar_url: function(newAvatar_url)
{ avatar_url = newAvatar_url; $rootScope.$broadcast('updateAvatar');}}
);

I would like to update the avatar_url variable in the ng-src every-time its respective variable(avatar_url) in the user Service is updated. The variable in the user Service is updated through a http.POST request to the server. I have checked that the response from the server does update the variable in the user Service which is then broadcast to the avatar_url variable in the footerCtrl.

However, the image element HTML does not reflect the changes at all. In fact, I have also tried to preset the avatar_url variable to a relative path to one of the pictures in my page, the image still shows nothing(the ng-src value is empty). T

How to solve :

I know you bored from this bug, So we are here to help you! Take a deep breath and look at the explanation of your problem. We have many solutions to this problem, But we recommend you to use the first method because it is tested & true method that will 100% work for you.

Method 1

Changing the ng-src value is actually very simple. Like this:

<html ng-app>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.0.6/angular.min.js"></script>
</head>
<body>
<img ng-src="{{img_url}}">
<button ng-click="img_url = 'https://farm4.staticflickr.com/3261/2801924702_ffbdeda927_d.jpg'">Click</button>
</body>
</html>

Here is a jsFiddle of a working example: http://jsfiddle.net/Hx7B9/2/

Method 2

We can use ng-src but when ng-src's value became null, '' or undefined, ng-src will not work.
So just use ng-if for this case:

http://jsfiddle.net/Hx7B9/299/

<div ng-app>
    <div ng-controller="AppCtrl"> 
        <a href='#'><img ng-src="{{link}}" ng-if="!!link"/></a>
        <button ng-click="changeLink()">Change Image</button>
    </div>
</div>

Note: Use and implement method 1 because this method fully tested our system.
Thank you 🙂

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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