问题描述
我正在编写一个例程，将图像从iPhone（4S，iOS 6.1）上传到服务器。
I am writing a routine to upload images from my iPhone (4S, iOS 6.1) to a server.
var ft = undefined;
var e = document.getElementById('stopper');
e.addEventListener('click', onStopUploadBtn, false);
function uploadPhoto(imageURI) {
console.log('Preparing to upload' + imageURI);
...
ft = new FileTransfer();
ft.onprogress = onProgress;
ft.upload(imageURI, url, onUploadSuccess, onUploadError, uploadOptions);
console.log('upload started');
}
function onStopUploadBtn() {
if(ft) {
console.log('Aborting');
ft.abort(onUploadSuccess, onUploadError);
}
}
function onProgress(progressEvent) {
if (progressEvent.lengthComputable) {
console.log(progressEvent.loaded / progressEvent.total);
}
function onUploadSuccess(response) {
console.log("Code = " + response.responseCode);
console.log("Response = " + response.response);
console.log("Sent = " + response.bytesSent);
}
function onUploadError(error) {
alert("An error has occurred: Code = " = error.code);
}
上传的过程很吸引人，但我无法停止.abort（）。
The upload works like a charm, but I am not able to stop it with .abort().
实际上，当我按下停止按钮时，我看到ft.abort（）被调用了，但是传输一直进行到编译完成
In fact, when a I press the stopper button, I see that ft.abort() is invoked, but the transfer keep going, till comp
以下是日志：
2013-02-09 12:29:18.422 HelloWorld[855:907] Multi-tasking -> Device: YES, App: YES
2013-02-09 12:29:22.496 HelloWorld[855:907] [LOG] opening camera
2013-02-09 12:29:30.728 HelloWorld[855:907] [LOG] Preparing to uploadfile://localhost/var/mobile/Applications/C82E5A93-D276-4380-8420-39165C9644C4/tmp/cdv_photo_014.jpg
2013-02-09 12:29:30.729 HelloWorld[855:907] [LOG] upload ready to go
2013-02-09 12:29:30.732 HelloWorld[855:907] -[CDVFileTransfer requestForUploadCommand:fileData:][Line 207] fileData length: 1016478
2013-02-09 12:29:30.734 HelloWorld[855:907] [LOG] upload started
2013-02-09 12:29:31.208 HelloWorld[855:907] [LOG] 0.03223007996537784
2013-02-09 12:29:31.210 HelloWorld[855:907] [LOG] 0.06446015993075568
2013-02-09 12:29:31.213 HelloWorld[855:907] [LOG] 0.09669023989613353
...
2013-02-09 12:29:32.057 HelloWorld[855:907] [LOG] 0.16511030894372916
2013-02-09 12:29:32.113 HelloWorld[855:907] [LOG] 0.167868278432954
2013-02-09 12:29:32.172 HelloWorld[855:907] [LOG] 0.17062624792217884
2013-02-09 12:29:32.188 HelloWorld[855:907] [LOG] Aborting
2013-02-09 12:29:32.191 HelloWorld[855:907] FileTransferError {
code = 4;
source = "file://localhost/var/mobile/Applications/C82E5A93-D276-4380-8420-39165C9644C4/tmp/cdv_photo_014.jpg";
target = "...";
}
2013-02-09 12:29:32.229 HelloWorld[855:907] [LOG] 0.17338421741140367
...
2013-02-09 12:29:45.641 HelloWorld[855:907] [LOG] 0.9939470241666585
2013-02-09 12:29:45.698 HelloWorld[855:907] [LOG] 0.9967049936558833
2013-02-09 12:29:45.757 HelloWorld[855:907] [LOG] 0.9991324789267132
2013-02-09 12:29:45.813 HelloWorld[855:907] [LOG] 1
2013-02-09 12:30:17.200 HelloWorld[855:907] File Transfer Finished with response code 200
2013-02-09 12:30:17.203 HelloWorld[855:907] [LOG] Code = 200
2013-02-09 12:30:17.204 HelloWorld[855:907] [LOG] Response = 17
2013-02-09 12:30:17.205 HelloWorld[855:907] [LOG] Sent = 1016692
.abort（）被正确调用，因为我收到API 。
The .abort() is called properly, as I receive the error stated in the API's http://docs.phonegap.com/en/2.3.0/cordova_file_file.md.html#FileTransfer .
即时消息
您是否知道发生了什么？
Do you have any idea on what is going on?
推荐答案
如果（progressEvent.lengthComputable）{
没有匹配的结束括号。
"if (progressEvent.lengthComputable) {"has no matching closing bracket.
是那会破坏后续方法onUploadSuccess和onUploadError。
It could be that's broken subsequent methods onUploadSuccess and onUploadError. Or perhaps that's just a typo in your question.
顺便说一句，最好为每个imageURI保存一个FileTransfer引用，而不是对单个图像使用全局引用。文件传输。然后，您可以一次上传多张照片，并且仍然保留分别取消每次上传的功能，例如
Incidentally, it might be good practice to save a FileTransfer reference for each imageURI, rather than using a global reference to a single FileTransfer. Then you could upload multiple photos at once, and still retain the ability to cancel each upload separately, e.g.
// basic implementation of hash map of FileTransfer objects
// so that given a key, an abort function can find the right FileTransfer to abort
function SimpleHashMap()
{
this.items = {};
this.setItem = function(key, value) { this.items[key] = value; }
this.getItem = function(key)
{
if (this.hasItem(key)) { return this.items[key]; }
return undefined;
}
this.hasItem = function(key) { return this.items.hasOwnProperty(key); }
this.removeItem = function(key)
{
if (this.hasItem(key)) { delete this.items[key]; }
}
}
var fileTransferMap = new SimpleHashMap();
...然后在创建新的FileTransfer之后在uploadPhoto中：
...then in uploadPhoto after creating a new FileTransfer:
// register this object so that abort can find it
fileTransferMap.setItem(imageURI, ft);
...然后在取消按钮中传递imageURI：
...then pass the imageURI in your cancel button:
function onStopUploadBtn(imageURI)
{
var ft = fileTransferMap.getItem(imageURI);
if (ft)
{
console.log('Aborting');
ft.abort(onUploadSuccess, onUploadError);
}
}
...并记得从下载完成或出现错误时进行映射：
...and remember to remove the ft from the map when download is complete, or upon error:
fileTransferMap.removeItem(imageURI);
这篇关于PhoneGap / Cordova FileTransfer.abort无法正常工作的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！