Question

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正在显示并且正常工作，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

您的网址不会在更改时更新。您应该使用msgID中的值更新网址，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

1 个答案: