php ajax实现文件上传进度条

5年以前 | 阅读数：1165 次 | 编程语言：PHP

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。