我遇到了jQuery File Uploader (blueimp)的问题：
我的实现是完全定制的。我使用图像预览和验证。
我的问题是，即使我在我的fileuploadadd事件中定义 data.context，它在fileuploadprogress被触发时也是空的。
$('fileinput-element').fileupload({
url: '/__module/uploadModule/receive',
type: 'post',
acceptFileTypes: acceptedFileRegEx,
dataType: 'json',
'dropZone': $(dropZone),
paramName: 'files',
autoUpload: false,
}).on('fileuploadadd', function (e, data) {
$.each(data.files, function (index, file) {
// NOTE: This function call returns a clone of an element that i use as template for upload list items. Works fine.
var component=uploadModule.getDynamicComponent('listItemContainer');
// Filling the template (code omitted due to better readabilty)
// Appending the component to my #uploadList and assigning that to data.context
data.context = component.appendTo('#uploadList');
});
// For manual submittion later on, i fill an array with the data objects from each event call
dataList.push(data);
}).on('fileuploadprocessalways', function(e,data){
var index = data.index,
file = data.files[index],
node = $(data.context.children()[index]);
// Further code ommitted due to readability. Here i apply file.preview and (potential) file.error to my list item that is now stored in the variable node. This works fine. My list renders perfectly well.
}).on('fileuploadprogress', function(e, data){
// PROBLEM: data.context is EMPTY ! Why???
console.log(data.context);
});
这就是我在单击开始上传按钮后提交所有内容的方式：
$(dataList).each(function(){
this.submit();
});
// This works well - the uploads are being submitted and sent to the server.
我已经进行了广泛的解决方案搜索、测试、试验和错误、调试 1.5 天。我只是无法解决这个问题。
我究竟做错了什么？
请注意：如果我data.submit()在add事件回调中执行正确操作，则data.context在进度事件触发时会正确填充，但我不再可以选择手动启动整个上传队列。