我的目标是使用 PHP 在一个文本框中输入输入，然后将其插入另一个表，但它一直失败，请帮助我，从而自动填充数据库中的所有输入字段。
<html>
<head>
<script src=
"https://code.jquery.com/jquery-3.2.1.min.js">
</script>
<script src=
"https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"
type="text/javascript">
</script>
<link rel="stylesheet" href=
"https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js">
</script>
</head>
<body>
<div class="container">
<h1>GeeksForGeeks</h1>
<div class="row">
<div class="col-lg-6">
<div class="form-group">
<label>User Id</label>
<input type='text' name="user_id"
id='user_id' class='form-control'
placeholder='Enter user id'
onkeyup="GetDetail(this.value)" value="">
</div>
</div>
</div>
<div class="row">
<div class="col-lg-6">
<div class="form-group">
<label>First Name:</label>
<input type="text" name="first_name"
id="first_name" class="form-control"
placeholder='First Name'
value="">
</div>
</div>
</div>
<div class="row">
<div class="col-lg-6">
<div class="form-group">
<label>Last Name:</label>
<input type="text" name="last_name"
id="last_name" class="form-control"
placeholder='Last Name'
value="">
</div>
</div>
</div>
</div>
<script>
// onkeyup event will occur when the user
// release the key and calls the function
// assigned to this event
function GetDetail(str) {
if (str.length == 0) {
document.getElementById("first_name").value = "";
document.getElementById("last_name").value = "";
return;
}
else {
// Creates a new XMLHttpRequest object
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function () {
// Defines a function to be called when
// the readyState property changes
if (this.readyState == 4 &&
this.status == 200) {
// Typical action to be performed
// when the document is ready
var myobj = JSON.parse(this.responseText);
// Returns the response data as a
// string and store this array in
// a variable assign the value
// received to first name input field
document.getElementById
("first_name").value = myobj[0];
// Assign the value received to
// last name input field
document.getElementById(
"last_name").value = myobj[1];
}
};
// xhttp.open("GET","filename",true);
xmlhttp.open("GET","gfg.php?user_id=" + str,true);
// Sends the request to the server
xmlhttp.send();
}
}
</script>
</body>
</html>