为什么我的POST请求会触发express get

时间:2017-03-07 17:46:40

标签: javascript express xmlhttprequest

我的快递服务器,deliverCard()方法提供了一些键/值对。

app.get('/', (req, res) => {
  let card = deck.deliverCard();
  console.log('get', card)
  res.render('layout.ejs', {element:card});
});

app.post('/', (req, res) => {
  let card = deck.deliverCard();
  console.log('post', card);
  res.json(card);
});

XMLHttpRequest

  function updateCard(value) {
  let request = new XMLHttpRequest();
  let params = JSON.stringify({learned: value});

  request.onreadystatechange = () => {
    if (request.readyState === 4 && request.status === 200) {
      // Do a thing.
    } else {
      console.log('Status ' + request.status + ' text: ' + request.responseText);
    }
  }
  request.open('POST', '/', true);
  request.setRequestHeader('Content-type', 'application/json');
  request.send(params);
}

close.addEventListener('click', function() {
  value = checkbox[0].checked;
  updateCard(value);
});

我从请求中找回了正确的请求主体,但由于某种原因,在服务器端,正在调用get回调函数。

开始和初始页面加载:

app listening on port 3000!
get { name: 'div',
description: 'Defines a generic block of content, that does not carry any semantic value. Used for layout elements like containers.' }

根据要求:

post { name: 'meter', description: 'Defines a horizontal meter.' }
get { name: 'progress', description: 'Defines a progress bar.' } 

就好像页面在收到回复后重新加载一样。

1 个答案:

答案 0 :(得分:0)

一旦我的问题得到了解答,我就找到了答案:How to avoid automatic page reload after XMLHttpRequest call?。从上面的代码中可以看出,我提交的是一个表单。为了防止表单提交中的默认操作,我这样做了:

close.addEventListener('click', function(e) {
  e.preventDefault();
  value = checkbox[0].checked;
  updateCard(value);
});