Iphone PhoneGap/Cordova FileTransfer.abort未按预期工作

我正在编写一个例程，将图像从iPhone（4S，iOS 6.1）上传到服务器

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);
}

上传就像一个符咒，但我无法用.abort（）阻止它

事实上，当我按下stopper按钮时，我看到调用了ft.abort（），但传输继续进行，直到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，因为我收到了API中声明的错误

如日志所示，映像已正确传输到服务器

你知道发生了什么吗？

“如果（progressEvent.lengthComputeable）{” 没有匹配的结束括号

它可能是破坏了后续的方法onUploadSuccess和onUploadError，或者这只是你问题中的一个输入错误

顺便说一句，最好为每个imageURI保存一个FileTransfer引用，而不是使用单个FileTransfer的全局引用。这样，您就可以一次上载多张照片，并且仍然可以分别取消每次上载，例如

// 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();            

…然后在创建新文件传输后的上载照片中：

// register this object so that abort can find it
fileTransferMap.setItem(imageURI, ft);

…然后在“取消”按钮中传递imageURI：

function onStopUploadBtn(imageURI)
{
    var ft = fileTransferMap.getItem(imageURI);
    if (ft)
    {
        console.log('Aborting');
        ft.abort(onUploadSuccess, onUploadError);
    }
}

…下载完成或出现错误时，请记住从地图中删除ft：

fileTransferMap.removeItem(imageURI);