使用ajax从HTML输入框发送消息并显示响应

Question

When i load this file on my server and launch the address from my browser the input field is showing and working but when I enter a new string I dont get a response back. 当我将此文件加载到服务器上并从浏览器启动地址时，输入字段将显示并正常工作，但是当我输入新字符串时，我没有得到回复。

<!DOCTYPE html>
<html>
<body>

<h2>Sending / retrieving a message with AJAX</h2>
<label for="name">Enter message below:</label><BR>
<input type="text" id="msgID" name="name" onchange="loadDoc()" required minlength="1" size="30">

<p id="demo"></p>

<script>
var newmsg = document.getElementById("msgID").value;
var blob = new Blob([newmsg], {type: 'text/plain'});
var url = URL.createObjectURL(blob);
function loadDoc() {
  var xhttp = new XMLHttpRequest();
  xhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
      document.getElementById("demo").innerHTML = this.responseText;
    }
  };
  xhttp.open("GET", url, true);
  xhttp.send();
}
</script>

</body>
</html>

Answer 1

Your url is not updated onchange. 您的网址不会按onchange更新。 You should update the url with the value from msgID and send XMLHttpRequest on the new url. 您应该使用msgID的值更新网址，并在新网址上发送XMLHttpRequest 。

<!DOCTYPE html>
<html>
<body>

<h2>Sending / retrieving a message with AJAX</h2>
<label for="name">Enter message below:</label><BR>
<input type="text" id="msgID" name="name" onchange="loadDoc()" required minlength="1" size="30">

<p id="demo"></p>

<script>
function loadDoc() {
  var newmsg = document.getElementById("msgID").value;
  var blob = new Blob([newmsg], {type: 'text/plain'});
  var url = URL.createObjectURL(blob);
  var xhttp = new XMLHttpRequest();
  xhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
      document.getElementById("demo").innerHTML = this.responseText;
    }
  };
  xhttp.open("GET", url, true);
  xhttp.send();
}
</script>

</body>
</html>

使用ajax从HTML输入框发送消息并显示响应

问题描述

1 个解决方案

解决方案1
1 已采纳 2019-06-01 18:18:27

使用ajax从HTML输入框发送消息并显示响应

问题描述

1 个解决方案

解决方案1 1 已采纳 2019-06-01 18:18:27

解决方案1
1 已采纳 2019-06-01 18:18:27