How to call a function in “ng-src”

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I need to be able to call a function in order to run code to dynamically retrieve the source of an image. The following code snippet shows an example of what I want:

JavaScript:

 angular.module('MyApp', [])
    .controller('Ctrl2', function($scope) {
    })
    .directive('mySrc', function() {
        return {
        restrict: 'A',
        link: function ( scope, elem, attrs ) {
             //replace test with whatever myFunction() does
             elem.attr('src', 'test1');
        }
      };
    });

HTML:

<div ng-app="MyApp">
  <div ng-controller="Ctrl2">
      <img my-src />
  </div>
</div>

Fiddle

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盖世英雄少女心

2020-12-24 01:19

Wouldn't it be better to pass myFunction as an argument to the custom directive? That way, we decouple the two, and can easily change which function to pass in in the future.

HTML

<body ng-app='testApp'>
    <div ng-controller='TestCtrl'>
        <img my-src callback='myFunction()' />
    </div>
</body>

JS:

angular.module('testApp', [])
.controller('TestCtrl', function($scope) {
    $scope.myFunction = function() {
        return 'http://nodejs.org/images/roadshow-promo.png';
    }
})
.directive('mySrc', function() {
    return {
        restrict: 'A',
        scope: {
            callback: '&'
        },
        link: function ( scope, elem, attrs ) {
            elem.attr('src', scope.callback());
        }
    };
})

http://jsfiddle.net/GLS2a/

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