php ajax实现文件上传进度条

时间：2021-05-26

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 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";}?>

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