来自 xmlhttprequest 的空响应文本

发布于 2024-11-18 16:47:28 字数 360 浏览 0 评论 0原文

我使用ajax上传文件，为什么xmlhttprequest.responseText的responseText返回空？

我的代码：

req = new XMLHttpRequest(); 
req.file = file; 
req.addEventListener('change', changeProgress); 
 req.onreadystatechange = 
function() {
if(this.readyState == 4) {
  //etc.. 
alert(req.responseText);
}
}; 
req.open('POST','/upload',true);
req.send(file);

原文

I'm upload an file using ajax,why the responseText from xmlhttprequest.responseText is returned empty?

My code:

req = new XMLHttpRequest(); 
req.file = file; 
req.addEventListener('change', changeProgress); 
 req.onreadystatechange = 
function() {
if(this.readyState == 4) {
  //etc.. 
alert(req.responseText);
}
}; 
req.open('POST','/upload',true);
req.send(file);

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诺曦 2024-11-25 16:47:28

出于安全原因，不支持在 XMLHttpRequest 对象中上传文件

编辑：但是，可以使用 XMLHttpRequest 2

function upload(blobOrFile) {
  var xhr = new XMLHttpRequest();
  xhr.open('POST', '/server', true);
  xhr.onload = function(e) { ... };

  // Listen to the upload progress.
  var progressBar = document.querySelector('progress');
  xhr.upload.onprogress = function(e) {
    if (e.lengthComputable) {
      progressBar.value = (e.loaded / e.total) * 100;
      progressBar.textContent = progressBar.value; // Fallback for unsupported browsers.
    }
  };

  xhr.send(blobOrFile);
}

upload(new Blob(['hello world'], {type: 'text/plain'}));

Uploading files in XMLHttpRequest object is not supported for security reasons

EDIT: This is, however, possible with XMLHttpRequest 2

function upload(blobOrFile) {
  var xhr = new XMLHttpRequest();
  xhr.open('POST', '/server', true);
  xhr.onload = function(e) { ... };

  // Listen to the upload progress.
  var progressBar = document.querySelector('progress');
  xhr.upload.onprogress = function(e) {
    if (e.lengthComputable) {
      progressBar.value = (e.loaded / e.total) * 100;
      progressBar.textContent = progressBar.value; // Fallback for unsupported browsers.
    }
  };

  xhr.send(blobOrFile);
}

upload(new Blob(['hello world'], {type: 'text/plain'}));

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