使用xhr发送帖子请求

时间:2018-06-30 16:10:24

标签: javascript node.js ajax post xmlhttprequest

我在node.js中创建了一个非常简单的API,用于获取发布的数据。我正在使用javascript的xhr(xml http request)发送表单数据。(未使用jquery)但是我无法在服务器端接收表单数据。请帮助我解决此问题。下面是代码。

前端代码:

   <form> 
        <input type="email" class="form-control" id="email" 
         placeholder="Enter email" name="email" 

        <input type="password" class="form-control" id="password" 
         placeholder="Enter password" name="password" required="">

        <input type="file" class="form-control" id="userfile" name="userfile" 
         required="">

    <button type="submit" class="btn btn-default" id="submit">Submit</button>
  </form>

  <script>
    document.getElementById('submit').addEventListener('click',function(){

        var email=document.getElementById('email').value;
        var password=document.getElementById('password').value;
        var fileInputElement = document.getElementById('userfile');

        var formData = new FormData();

        formData.append("email", email);
        formData.append("password", password);
        formData.append("userfile", fileInputElement.files[0]);

        var xhr = new XMLHttpRequest();
        xhr.open("POST", "http://localhost:3000/form_submit");
        xhttp.setRequestHeader("Content-type", "application/x-www-form- 
        urlencoded");
        xhr.send(formData); 
    })
  </script>

后端代码(Node js API代码):

var express = require('express');

var app = express();

app.get('/',(req,res)=>{
  console.log('you are welcome');
}) 
app.post('form_submit',function(req,res){
  console.log('entered in post request');
  console.log(req.body);
})

app.listen(3000,()=>{
  console.log('connected to 3000 port');
})

1 个答案:

答案 0 :(得分:0)

要允许express处理表单数据,您需要使用bodyParser模块:

将bodyParser.urlencoded()中间件用作:

const bodyParser = require('body-parser');
app.use(bodyParser.urlencoded({ extended: true }));
//Now you can get the form values will be on req.body:

app.post('form_submit',function(req,res){
  console.log('entered in post request');
  console.log(req.body);
})

仅供参考:请注意,body解析器不能处理多部分主体,因此在这种情况下,您可以使用类似multer

的模块
  

Multer是用于处理multipart / form-data的node.js中间件,主要用于上传文件。

例如,要检索请求的(常规)字段:

let multer = require('multer');
let upload = multer();
 app.post('form_submit', upload.fields([]), (req, res) => {
      let formData = req.body;
      console.log('form data', formData);
 });