javascript - 文件名一直显示未定义

Question

我尝试在用户上传文件后显示文件的名称。文件上传成功，但在 javascript 中它不断显示以下消息:

The file (undefined) was uploaded successfully!

当它应该显示文件名时，它却一直显示未定义。为什么是这样？目前发生的情况是，当用户上传文件时，文件被上传到“ImageFiles”文件夹中，当上传完成时，下面的 JavaScript 函数会显示消息以说明已成功上传的文件的名称。

下面是上传后显示文件名和消息的代码:

function stopImageUpload(success){

    function handleFileSelect(evt) {
    var files = evt.target.files;
    localStorage["fname"] = files[0].name; //save the name for future use
}

$('.fileImage').bind('change', handleFileSelect, false);


      var result = '';
      if (success == 1){
  result = '<span class="msg">The file ('+localStorage["fname"]+') was uploaded successfully!</span><br/><br/>';
    localStorage["fname"] = undefined; //remove the temporary variable

      }
      else {
         result = '<span class="emsg">There was an error during file upload!</span><br/><br/>';
      }

      return true;   
}

以下是表格:

  <form action='imageupload.php' method='post' enctype='multipart/form-data' target='upload_target' onsubmit='stopImageUpload(this);' class='imageuploadform' >
    <p>Image File: <input name='fileImage' type='file' class='fileImage' />
    <input type='submit' name='submitImageBtn' class='sbtnimage' value='Upload' />
    </p> 
    </form>

Answer 1

试试这个:

var fileName;
function stopImageUpload(success){

    function handleFileSelect(evt) {
    var files = evt.target.files;
    fileName = files[0].name; //save the name for future use
}

$('.fileImage').bind('change', handleFileSelect, false);


      var result = '';
      if (success == 1){
  result = '<span class="msg">The file ('+fileName+') was uploaded successfully!</span><br/><br/>';
    fileName = ""; //remove the temporary variable

      }
      else {
         result = '<span class="emsg">There was an error during file upload!</span><br/><br/>';
      }

      return true;   
}