php ajax实现文件上传进度条

本实例是关于php 文件上传时进度条的实现，主要采用ajax技术，另外还运用了html5，有需要的朋友可以研究一下。
本实例有两个文件：

upload_form.html：

									<!DOCTYPE html>

									<html>

									<head>

									<script>

									function _(el){

									  return document.getElementById(el);

									}

									function uploadFile(){

									  var file = _("file1").files[0];

									  // alert(file.name+" | "+file.size+" | "+file.type);

									  var formdata = new FormData();

									  formdata.append("file1", file);

									  var ajax = new XMLHttpRequest();

									  ajax.upload.addEventListener("progress", progressHandler, false);

									  ajax.addEventListener("load", completeHandler, false);

									  ajax.addEventListener("error", errorHandler, false);

									  ajax.addEventListener("abort", abortHandler, false);

									  ajax.open("POST", "file_upload_parser.php");

									  ajax.send(formdata);

									}

									function progressHandler(event){

									  _("loaded_n_total").innerHTML = "Uploaded "+event.loaded+" bytes of "+event.total;

									  var percent = (event.loaded / event.total) * 100;

									  _("progressBar").value = Math.round(percent);

									  _("status").innerHTML = Math.round(percent)+"% uploaded... please wait";

									}

									function completeHandler(event){

									  _("status").innerHTML = event.target.responseText;

									  _("progressBar").value = 0;

									}

									function errorHandler(event){

									  _("status").innerHTML = "Upload Failed";

									}

									function abortHandler(event){

									  _("status").innerHTML = "Upload Aborted";

									}

									</script>

									</head>

									<body>

									<h2>HTML5 File Upload Progress Bar Tutorial</h2>

									<form id="upload_form" enctype="multipart/form-data" method="post">

									 <input type="file" name="file1" id="file1"><br>

									 <input type="button" value="Upload File" onclick="uploadFile()">

									 <progress id="progressBar" value="0" max="100" style="width:300px;"></progress>

									 <h3 id="status"></h3>

									 <p id="loaded_n_total"></p>

									</form>

									</body>

									</html>

file_upload_parser.php：

									<?php

									$fileName = $_FILES["file1"]["name"]; // The file name

									$fileTmpLoc = $_FILES["file1"]["tmp_name"]; // File in the PHP tmp folder

									$fileType = $_FILES["file1"]["type"]; // The type of file it is

									$fileSize = $_FILES["file1"]["size"]; // File size in bytes

									$fileErrorMsg = $_FILES["file1"]["error"]; // 0 for false... and 1 for true

									if (!$fileTmpLoc) { // if file not chosen

									  echo "ERROR: Please browse for a file before clicking the upload button.";

									  exit();

									}

									if(move_uploaded_file($fileTmpLoc, "test_uploads/$fileName")){

									  echo "$fileName upload is complete";

									} else {

									  echo "move_uploaded_file function failed";

									}

									?>

以上就是本文的全部内容，希望对大家的学习有所帮助。

php ajax实现文件上传进度条

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