当图像的网址没有改变但是其内容有吗?
时,如何强制angularjs重新加载具有ng-src属性的图像?<div ng-controller='ctrl'>
<img ng-src="{{urlprofilephoto}}">
</div>
执行文件上传的uploadReplace服务正在替换图片的内容,而不是网址。
app.factory('R4aFact', ['$http', '$q', '$route', '$window', '$rootScope',
function($http, $q, $route, $window, $rootScope) {
return {
uploadReplace: function(imgfile, profileid) {
var xhr = new XMLHttpRequest(),
fd = new FormData(),
d = $q.defer();
fd.append('profileid', profileid);
fd.append('filedata', imgfile);
xhr.onload = function(ev) {
var data = JSON.parse(this.responseText);
$rootScope.$apply(function(){
if (data.status == 'OK') {
d.resolve(data);
} else {
d.reject(data);
}
});
}
xhr.open('post', '/profile/replacePhoto', true)
xhr.send(fd)
return d.promise;
}
}
}]);
当uploadReplace返回时,我不知道如何强制图像重新加载
app.controller('ctrl', ['$scope', 'R4aFact', function($scope, R4aFact){
$scope.clickReplace = function() {
R4aFact.uploadReplace($scope.imgfile, $scope.pid).then(function(){
// ?? here I need to force to reload the imgsrc
})
}
}])
答案 0 :(得分:76)
一个简单的解决方法是在ng-src中附加一个唯一的时间戳,以强制重新加载图像,如下所示:
$scope.$apply(function () {
$scope.imageUrl = $scope.imageUrl + '?' + new Date().getTime();
});
或
angular.module('ngSrcDemo', [])
.controller('AppCtrl', ['$scope', function ($scope) {
$scope.app = {
imageUrl: "http://example.com/img.png"
};
var random = (new Date()).toString();
$scope.imageSource = $scope.app.imageUrl + "?cb=" + random;
}]);
答案 1 :(得分:27)
也许它可以像在图像URL中添加decache查询字符串一样简单?即
var imageUrl = 'http://i.imgur.com/SVFyXFX.jpg';
$scope.decachedImageUrl = imageUrl + '?decache=' + Math.random();
这应该强制它重新加载。
答案 2 :(得分:16)
&#34;角度方法&#34;可以创建自己的过滤器,将随机查询字符串参数添加到图像URL。
这样的事情:
.filter("randomSrc", function () {
return function (input) {
if (input) {
var sep = input.indexOf("?") != -1 ? "&" : "?";
return input + sep + "r=" + Math.round(Math.random() * 999999);
}
}
})
&#13;
然后你可以像这样使用它:
<img ng-src="{{yourImageUrl | randomSrc}}" />
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答案 3 :(得分:6)
试试这个
app.controller('ctrl', ['$scope', 'R4aFact', function($scope, R4aFact){
$scope.clickReplace = function() {
R4aFact.uploadReplace($scope.imgfile, $scope.pid).then(function(response){
$scope.urlprofilephoto = response + "?" + new Date().getTime(); //here response is ur image name with path.
});
}
}])
答案 4 :(得分:0)
我使用了一个指令将随机参数放在src中,但是只有当图像发生变化时,我才不会因为缓存而搞得那么多。
我用它来更新用户在导航栏中的个人资料图片,当他们通过AJAX更新时,这种情况并不经常发生。
(function() {
"use strict";
angular
.module("exampleApp", [])
.directive("eaImgSrc", directiveConstructor);
function directiveConstructor() {
return { link: link };
function link(scope, element, attrs) {
scope.$watch(attrs.eaImgSrc, function(currentSrc, oldSrc) {
if (currentSrc) {
// check currentSrc is not a data url,
// since you can't append a param to that
if (oldSrc && !currentSrc.match(/^data/)) {
setSrc(currentSrc + "?=" + new Date().getTime());
} else {
setSrc(currentSrc);
}
} else {
setSrc(null);
}
})
function setSrc(src) { element[0].src = src; }
}
}
})();
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<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="exampleApp">
<div>
<img ea-img-src="src"></img>
</div>
<button ng-click="src = 'http://placehold.it/100x100/FF0000'">IMG 1</button>
<button ng-click="src = 'http://placehold.it/100x100/0000FF'">IMG 2</button>
<button ng-click="src = 'http://placehold.it/100x100/00FF00'">IMG 3</button>
</div>
&#13;