如何在上传文件时添加进度条 [英] how to add a progress bar on uploading a file

问题描述

我正在将文件传输到网址，我可以成功完成但我不知道如何获取已上传文件的进度，我需要在某些数字上取得进展

i am transferring file to a url, i could do it successfully but i dont know how to get the progress of the file that is been uploaded, i need to get progress in some numbers

 fileTransfer.upload(file_path, api_endpoint, options, data)
                                .then((data) => {
                                    // success 
                                     console.log("success", JSON.parse(data['response']));

                                    this.upload_success();

                                }, (err) => {
                                    // error 
                                    this.failed_upload();
                                    console.log('File failed uploaded.', err);
                                })

我发现onProgress（听众） c在ionic2文档中哎呀我不知道如何使用可能有人给我一些例子

i found onProgress(Listener) check in ionic2 documentation i dont know how to use could some one give me some examples

更新
完成文档后 https： //github.com/apache/cordova-plugin-file-transfer#example-with-upload-headers-and-progress-events-android-and-ios-only

fileTransfer.onProgress = function(progressEvent) {
    if (progressEvent) {
        console.log("progress success =====")
    } else {
        console.log("progress error =====")
    }
};     

如果我运行我看不到任何这些控制台我在文件传输代码下面添加了这个新代码。可能有人帮助我

if i run i could not see any of those console i added this new code below the file transfer code. could some one help me

推荐答案

你可以通过使用像这样的onProgress函数来显示progressBar

You can show progressBar by using onProgress function like this

public   fileTransfer: TransferObject = this.transfer.create();
public upload(path,folder) 
{
  url="http://www.axmag.com/download/pdfurl-guide.pdf";
  var trustHosts = true;
  this.presentLoading("Loading");
  //**Progress Bar**
  this.fileTransfer.onProgress((e)=>
  {
    let prg=(e.lengthComputable) ?  Math.round(e.loaded / e.total * 100) : -1;  
    console.log("progress:"+prg);
  });

  this.fileTransfer.upload(file_path, api_endpoint, options, data).then((entry) => {
//handle success        
console.log('upload complete: ' );
  },
  (error) => {
    this.loader.dismiss();
    alert('uploading faild: ');
    console.log(error);
  //handle error
  });
}

现在你可以调用upload（）函数来上传文件

Now you can call upload() function to upload a file

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