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AngularJS animate image on src change

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一整个雨季
一整个雨季 2020-12-30 09:26

I have an AnuglarJS app, where I load/change some images from a webservice...

Controller

.controller(\'PlayerCtrl\', function($scope, programService
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8条回答
  • 忘掉有多难
    2020-12-30 10:05

    Update 1.5.x - with Angular 1.5.x you can use ngAnimateSwap to achieve this effect.

    0 讨论(0)
  • 不知归路
    2020-12-30 10:07

    I know its late but according to @Aides answer i am posting here an working example that how can you achieve animation with change in ng-src using ngAnimateSwap (with Angular 1.5.x). I hope this helps someone in future:

    HTML Markup:

    <!doctype html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <title>Example - example-ngAnimateSwap-directive-production</title>
  <link href="animations.css" rel="stylesheet" type="text/css">


  <script src="//code.angularjs.org/snapshot/angular.min.js"></script>
  <script src="//code.angularjs.org/snapshot/angular-animate.js"></script>
  <script src="script.js"></script>


  <script type="text/javascript">
    angular.element(document.getElementsByTagName('head')).append(angular.element('<base href="' + window.location.pathname + '" />'));
  </script>
</head>

<body ng-app="ngAnimateSwapExample" ng-controller="AppCtrl">
  <div class="container">
    <img ng-animate-swap="activeImage" class="cell swap-animation" ng-src="{{activeImage}}" alt="My Active Image" />
  </div>
  <div>
    Current Image: {{activeImage}}
    <br />
    <button ng-click="previous()">Previous</button>
    <button ng-click="next()">Next</button>
  </div>
</body>

</html>

    JS (script.js):

    (function(angular) {
  'use strict';
  angular.module('ngAnimateSwapExample', ['ngAnimate'])
    .controller('AppCtrl', ['$scope', '$timeout', function($scope, $timeout) {

      var baseUrl = "http://lorempixel.com/400/200/sports";
      $scope.images = [];
      $scope.startIndex = 0;
      for (var i = 0; i < 5; i++) {
        $scope.images.push(baseUrl + "/" + i);
      }

      $scope.activeImage = $scope.images[$scope.startIndex];
      /*
            $interval(function() {
              $scope.startIndex++;
              if($scope.images[$scope.startIndex] && $scope.images[$scope.startIndex] != undefined){
                  $scope.activeImage = $scope.images[$scope.startIndex];  
              }

            }, 2000);
        */
      $scope.previous = function() {

        $scope.startIndex--;
        $timeout(function() {
          if ($scope.images[$scope.startIndex] && $scope.images[$scope.startIndex] !== undefined) {
            $scope.activeImage = $scope.images[$scope.startIndex];
          }
        }, 500);

      };

      $scope.next = function() {
        $scope.startIndex++;
        $timeout(function() {
          if ($scope.images[$scope.startIndex] && $scope.images[$scope.startIndex] !== undefined) {
            $scope.activeImage = $scope.images[$scope.startIndex];
          }
        }, 500);
      };
    }]);
})(window.angular);

    Working plunker here.

    0 讨论(0)
  • 粉色の甜心
    2020-12-30 10:08

    You can't animate an img src change. You can, however, have multiple images and animate their opacity.

    HTML/angular template

    <div class="image-container">
    <img src="image-one.jpg" ng-show="showImageOne">
    <img src="image-two.jpg" ng-show="showImageTwo">
</div>

    CSS

    .image-container {
    position: relative;
}

.image-container img {
    position: absolute;
    transition: 1s opacity linear;
}

.image-container img.ng-hide {
    display: block!important;
    opacity: 0;
}
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  • 情话喂你
    2020-12-30 10:12

    In case others end up here wanting to perform animations on change of a background image, I'll post what I ended up using.

    This directive assumes it's attached to a template like this:

    <!-- Full screen background image and scarecrow for onload event-->
<div class="full-screen-image" data-background-image="{{backgroundImageUrl}}"></div>
<img class="hidden-full-screen-image hidden" data-ng-src="{{backgroundImageUrl}}"></div>

    We want to set the background image source for the <div>, but attach an onload event so we know when the new image has arrived. To do that, we use an <img> with a .hidden class that has .hidden {display: none;}. Then we use the following directive to dynamically set the div's background image source and perform a fade to white then back from white on image change:

    /***
*
* Directive to dynamically set background images when 
* controllers update their backgroundImageUrl scope
* variables
*
* Template: <div data-background-image="{{backgroundImageUrl}}" />
*   AND     <img data-background-image="{{backgroundImageUrl}}" class="image-onload-target hidden" />
*
***/

var angular = require('angular');

angular.module('BackgroundImage', [])
  .directive('backgroundImage', [
    "$timeout",
  function ($timeout) {
  return function(scope, element, attrs){
    attrs.$observe('backgroundImage', function(value) {

      /***
      *
      * Define a callback to trigger once the image loads.
      * The value provided to this callback = the value
      * passed to attrs.$observe() above
      *
      ***/

      var imageLoadedCallback = function(value) {
        // once the image load event triggers, remove the event
        // listener to ensure the event is called only once
        fadeOut();
        target.removeEventListener('load', imageLoadedCallback);
        $timeout(function() {
          fadeIn(value);
        }, 700);
      }

      /***
      *
      * Define fade in / out events to be called once a new image
      * is passed to the attrs.backgroundImage in the directive
      *
      ***/

      var fadeOut = function() {
        element.css({'opacity': '0'})
      };

      var fadeIn = function(value) {
        element.css({
          'background': 'url(' + value +') no-repeat center center fixed',
          'background-size' : 'cover',
          'opacity': '1'
        });
      };

      // add an onload event to the hidden-full-screen-image
      var target = document.querySelector('.image-onload-target');
      target.addEventListener('load', imageLoadedCallback(value));

    });
  };
}]);

    Working with Angular makes me love React all the more...

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  • 误落风尘
    2020-12-30 10:12

    My solution to this problem is to watch for changes on ng-src and using a timeout function to add a class which does the fadeIn effect.

    HTML

    <img ng-src="your-logic-will-go-here" class="animate-show ng-hide-add" fade-in>

    Angular Code

    .directive('fadeIn', function($timeout){
    return {
        restrict: 'A',
        link: function($scope, $element, attrs){
            $scope.$watch('selectedFormat.name', function(newValue, oldValue) {
                if(newValue!=oldValue) {
                    $element.removeClass("ng-hide-add");
                    $element.addClass("ng-hide-remove");
                    $timeout(function () {
                        $element.addClass("ng-hide-add");
                    }, 100);
                }
            })
        }
    };
})

    CSS

    .animate-show.ng-hide-add, .animate-show.ng-hide-remove {
        display: inline-block !important;
    }
    .animate-show.ng-hide-add.ng-hide-add-active, .animate-show.ng-hide-remove {
        opacity: 0;
    }
    .animate-show.ng-hide-add{
      transition: all linear 0.7s;
    }
    .animate-show.ng-hide-add, .animate-show.ng-hide-remove.ng-hide-remove-active {
        opacity: 1;
    }
    0 讨论(0)
  • 予麋鹿
    2020-12-30 10:18

    As christoph has mentioned, you should watch using $watch on the image source change. But first make sure you use the ng-src rather than the src for the image tag. 

    <image id="new" ng-src="program.image" />

$scope.$watch('program.image', function(newValue, oldValue) {
    if(newValue===oldValue) return;
    $('img#new').hide();
    $('img#new').fadeIn("slow", function() {});
})
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