DownloadTask.onProgressUpdate(function listener)

Introduction

Listen to download progress change events.

Parameters

function listener

The listener function for download progress change events.

Parameters

Object res

Attribute	Type	Description
progress	number	Download progress in percentage.
totalBytesWritten	number	The length of data that has been downloaded, in Bytes.
totalBytesExpectedToWrite	number	The total length of data expected to be downloaded, in Bytes.

Sample Code

// pages/index/index.js

Page({
  downloadFile() {
    const downloadFileTask = dlt.downloadFile({
      url: "xxx",
      success(res) {
        console.log(res);
      },
      fail(res) {
        console.error(res);
      },
    });

    downloadFileTask.onProgressUpdate((res) => {
      console.log("Download Progress:", res.progress);
      console.log("Data length already downloaded:", res.totalBytesWritten);
      console.log("Total expected data length to download:", res.totalBytesExpectedToWrite);
    });
  },
});