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 = $_FILES["file1"]["error"]; // 0 for false... and 1 for trueif （！$fileTmpLoc） { // if file not chosenecho "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。