AngularJS Directive for ElevateZoom jQuery Plugin

问题

I'm trying to use the ElevateZoom jQuery plugin inside an angular app.

Essentially, to use ElevateZoom normally, you create an image as follows:

<img id="my-img" src="small.jpg" data-zoom-image="big.jpg" />

Then in your application JS:

$('#my-img').elevateZoom(options);

This works fine in a standard app. But when I try and do it in my AngularJS app using a directive (I followed some SO answers for getting jquery plugins into angular with directives) I just can't make it work.

Live editable demo on Plunkr: http://plnkr.co/edit/Mu4EOcGtGs7XVDDUvnnB?p=preview

My directive looks like:

app.directive('ngElevateZoom', function() {
  return {
    restrict: 'A',
    scope: true,
    compile: function(scope, element, attrs) {
      $(element).elevateZoom(scope.$eval(attrs.elevateZoom));
    }
  };
});

And my HTML looks like this:

<img ng-elevate-zoom ng-src="{{small_image}}" data-zoom-image="{{large_image}}" />

What am I doing wrong? I've only been experimenting with Angular a few days so go easy on me ;)

回答1:

Your directive:

app.directive('ngElevateZoom', function() {
  return {
    restrict: 'A',
    scope: true,
    compile: function(scope, element, attrs) {
      $(element).elevateZoom(scope.$eval(attrs.elevateZoom));
    }
  };
});

Keep in mind that compile function (tElement, tAttrs, transclude) { ... } dont have access to scope, so I guess you were trying to use the link function.

Check here

I did some changes:

HTML

<img ng-elevate-zoom
     ng-src="{{small_image}}"
     zoom-image="{{large_image}}" />

app.directive('ngElevateZoom', function() {
  return {
    restrict: 'A',
    link: function(scope, element, attrs) {
      element.attr('data-zoom-image',attrs.zoomImage);
      $(element).elevateZoom();
    }
  };
});

When using directly data-zoom-image='{{large_image}}', was causing that elevateZoom to try to get the value from that attribute and it was '{{large_image}}' at the time of running the plugin $(element).elevateZoom();

Check the updated Plunker

UPDATED

Since there could be cases when the attrs need for the plugin are delayed, you'll need to $observe the attr and only when its actually ready you call the plugin.

app.directive('ngElevateZoom', function() {
  return {
    restrict: 'A',
    link: function(scope, element, attrs) {

      // Watch for changes on the attribute before
      // calling the function.
      attrs.$observe('zoomImage', function() {
        linkElevateZoom();
      });

      function linkElevateZoom() {
        // Check that it's not empty.
        if (!attrs.zoomImage) return;
        element.attr('data-zoom-image',attrs.zoomImage);
        $(element).elevateZoom();
      }

      linkElevateZoom();
    }
  };
});

Check the updated plunker

Optional When using this in conjunction with views, the plugin leaves behind a div layered on top of the view. Here's a directive to solve that issue.

app.directive('zoomContainer', function() {
    return {
        restrict: 'A',
        link: function(scope, element, attrs) {
            scope.$on('$routeChangeSuccess', function() {
                var target = element.children('div.zoomContainer').remove();
            });
        }
    };
});

This directive needs to be applied to the body element.

<body zoom-container>

来源：https://stackoverflow.com/questions/21353124/angularjs-directive-for-elevatezoom-jquery-plugin

标签

javascript

jquery

angularjs

angularjs-directive