JS+html5實(shí)現(xiàn)異步上傳圖片顯示上傳文件進(jìn)度條功能示例

發(fā)布時(shí)間：2020-08-31 08:43:07 來源：腳本之家閱讀：358 作者：yo胡yo 欄目：web開發(fā)

本文實(shí)例講述了JS+html5實(shí)現(xiàn)異步上傳圖片顯示上傳文件進(jìn)度條功能。分享給大家供大家參考，具體如下：

<html>
  <head>
  </head>
  <body>
      <p>
  emo_album_id:<input type="text" name="emo_album_id" id="emo_album_id" value='1'>
</p>
<p>
  name:<input type="text" name="title" id="title">
</p>
      <div class="row">
        <label for="file">
          Upload Image:</label>
        <input type="file" name="fileToUpload" id="fileToUpload" multiple="multiple" onchange="fileSelected();" />
      </div>
SentenceMovie[photo]
      <div id="fileName">
      </div>
      <div id="fileSize">
      </div>
      <div id="fileType">
      </div> 
      <div id="progressNumber">
      </div>
    <script>
          function fileSelected() {
            var file = document.getElementById('fileToUpload').files[0];
            if (file) {
              var fileSize = 0;
              if (file.size > 1024 * 1024)
                fileSize = (Math.round(file.size * 100 / (1024 * 1024)) / 100).toString() + 'MB';
              else
                fileSize = (Math.round(file.size * 100 / 1024) / 100).toString() + 'KB';
              document.getElementById('fileName').innerHTML = 'Name: ' + file.name;
              document.getElementById('fileSize').innerHTML = 'Size: ' + fileSize;
              document.getElementById('fileType').innerHTML = 'Type: ' + file.type;
              uploadFile();
            }
          }
          function uploadFile() {
            var fd = new FormData();
            fd.append("upload_file", document.getElementById('fileToUpload').files[0]);
            fd.append("emo_album_id", document.getElementById('emo_album_id').value);
            fd.append("title", document.getElementById('title').value);
            var xhr = new XMLHttpRequest();
            xhr.upload.addEventListener("progress", uploadProgress, false);
            xhr.addEventListener("load", uploadComplete, false);
            xhr.addEventListener("error", uploadFailed, false);
            xhr.addEventListener("abort", uploadCanceled, false);
            xhr.open("POST", "http://mysae.com/emotions/1/api/index.php/emo/upload");
            xhr.send(fd);
          }
          function uploadProgress(evt) {
            if (evt.lengthComputable) {
              var percentComplete = Math.round(evt.loaded * 100 / evt.total);
              document.getElementById('progressNumber').innerHTML = percentComplete.toString() + '%';
            }
            else {
              document.getElementById('progressNumber').innerHTML = 'unable to compute';
            }
          }
          function uploadComplete(evt) {
            /* This event is raised when the server send back a response */
            alert(evt.target.responseText);
          }
          function uploadFailed(evt) {
            alert("There was an error attempting to upload the file.");
          }
          function uploadCanceled(evt) {
            alert("The upload has been canceled by the user or the browser dropped the connection.");
          }
    </script>
  </body>
</html>

更多關(guān)于JavaScript相關(guān)內(nèi)容感興趣的讀者可查看本站專題：《JavaScript+HTML5特效與技巧匯總》、《JavaScript圖片操作技巧大全》、《JavaScript圖形繪制技巧總結(jié)》、《JavaScript錯(cuò)誤與調(diào)試技巧總結(jié)》、《JavaScript數(shù)據(jù)結(jié)構(gòu)與算法技巧總結(jié)》、《JavaScript遍歷算法與技巧總結(jié)》及《JavaScript數(shù)學(xué)運(yùn)算用法總結(jié)》

希望本文所述對(duì)大家JavaScript程序設(shè)計(jì)有所幫助。

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JS+html5實(shí)現(xiàn)異步上傳圖片顯示上傳文件進(jìn)度條功能示例

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