我正试图从AngularJS $http POST请求获取文件上传的“进度”事件.
在查看了$http upload file progress in AngularJS之后,我遇到了一个最近的angular.js git commit,它假设要解决问题Add XHR progress event handling to $http and $httpBackend.
有没有人实现这个工作？如果是这样,可以展示这个例子吗？
PS.我宁愿继续使用$http而不是创建自己的XMLHttpRequest.原因是我的后端希望将json对象与多部分文件数据结合起来.并且尝试通过XMLHttpRequest失败,并显示错误消息,即后端未看到请求的json对象部分“必需字符串参数’objData’不存在.客户端发送的请求在语法上是不正确的.”在POST消息中,我在Firebug中看到“Content-Disposition：form-data; name =”objData“”.
$scope.uploadFile = function() {
var url = buildUrl('/upload');
var data = {objData: $scope.data,fileData: $scope.file};
var formData = new FormData();
formData.append("objData",angular.toJson(data.objData));
formData.append("fileData",data.fileData);
var xhr = new window.XMLHttpRequest();
xhr.upload.addEventListener("progress",uploadProgress,false);
xhr.open("POST",url);
xhr.setRequestHeader("Content-Type","application/json;charset=utf-8");
xhr.setRequestHeader("X-Requested-With","XMLHttpRequest");
xhr.send(formData);
};
在撰写本文时,$http不支持新1.2 $q的通知方法.所以你必须使用jquery xhr.它设置起来相当简单：
请注意,我们返回一个promise,因此uploadFile的使用者将执行uploadFile(..).然后(成功,失败,进度)
$scope.uploadFile = function() {
var deferred = $q.defer();
var getProgressListener = function(deferred) {
return function(event) {
//do some magic
deferred.notify(magic);
};
};
var formData = new FormData();
formData.append("objData",angular.toJson(data.objData));
formData.append("fileData",data.fileData);
$.ajax({
type: 'POST',url: buildUrl('/upload'),data: formData,cache: false,// Force this to be read from FormData
contentType: false,processData: false,success: function(response,textStatus,jqXHR) {
deferred.resolve(response);
},error: function(jqXHR,errorThrown) {
deferred.reject(errorThrown);
},xhr: function() {
var myXhr = $.ajaxSettings.xhr();
if (myXhr.upload) {
myXhr.upload.addEventListener(
'progress',getProgressListener(deferred),false);
} else {
$log.log('Upload progress is not supported.');
}
return myXhr;
}
});
return deferred.promise;
};
