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  • Javascript 如何为下拉菜单生成选择，其中包含来自数据库的行/记录数据，该数据库将在选择时预先填充表单？

Javascript 如何为下拉菜单生成选择，其中包含来自数据库的行/记录数据，该数据库将在选择时预先填充表单？

javascript php jquery forms

Javascript 如何为下拉菜单生成选择，其中包含来自数据库的行/记录数据，该数据库将在选择时预先填充表单？,javascript,php,jquery,forms,mysqli,Javascript,Php,Jquery,Forms,Mysqli,我正试图找出一种方法，用过去提交的表格信息预先填写表格 </header> <body> <form action="/demoform/contact_form.php" class="well" id="contactForm" method="post" name="sendMsg" novalidate=""> <big>LOAD PAST ORDERS:</big> <select id="extrafield1"

我正试图找出一种方法，用过去提交的表格信息预先填写表格

</header>

<body>

<form action="/demoform/contact_form.php" class="well" id="contactForm" method="post" name="sendMsg" novalidate="">

<big>LOAD PAST ORDERS:</big>
<select id="extrafield1" name="extrafield1">
<option value="">Please select...</option> 
 <option value="xxx">SAMPLE SELECTION</option>
</select>

</br>

<input type="text" required id="mile" name="mile" placeholder="Miles"/>

</br>

<input id="email" name="email" placeholder="Email" required="" type="text" value="demo@gmail.com" readonly="readonly"/>

</br>

<input id="name" name="itemname" placeholder="ITEM NAME 1" required="" type="text" />

</br>

<input type="reset" value="Reset" />


<button type="submit" value="Submit">Submit</button>


</form>


</body>


</html>
我有一个表格和一个数据库。在我的表单中，我有一个名为
email
的输入，它保存了预加载的只读成员电子邮件地址的默认值

</header>

<body>

<form action="/demoform/contact_form.php" class="well" id="contactForm" method="post" name="sendMsg" novalidate="">

<big>LOAD PAST ORDERS:</big>
<select id="extrafield1" name="extrafield1">
<option value="">Please select...</option> 
 <option value="xxx">SAMPLE SELECTION</option>
</select>

</br>

<input type="text" required id="mile" name="mile" placeholder="Miles"/>

</br>

<input id="email" name="email" placeholder="Email" required="" type="text" value="demo@gmail.com" readonly="readonly"/>

</br>

<input id="name" name="itemname" placeholder="ITEM NAME 1" required="" type="text" />

</br>

<input type="reset" value="Reset" />


<button type="submit" value="Submit">Submit</button>


</form>


</body>


</html>
如何在下拉菜单下生成一个选项，当选中该选项时，将使用数据库中的行/记录数据预填充表单

</header>

<body>

<form action="/demoform/contact_form.php" class="well" id="contactForm" method="post" name="sendMsg" novalidate="">

<big>LOAD PAST ORDERS:</big>
<select id="extrafield1" name="extrafield1">
<option value="">Please select...</option> 
 <option value="xxx">SAMPLE SELECTION</option>
</select>

</br>

<input type="text" required id="mile" name="mile" placeholder="Miles"/>

</br>

<input id="email" name="email" placeholder="Email" required="" type="text" value="demo@gmail.com" readonly="readonly"/>

</br>

<input id="name" name="itemname" placeholder="ITEM NAME 1" required="" type="text" />

</br>

<input type="reset" value="Reset" />


<button type="submit" value="Submit">Submit</button>


</form>


</body>


</html>
我已经做了几个星期了，似乎找不到任何方向来实现这一点。真的找不到任何教程网站、视频、示例代码或任何关于如何实现这一点的内容。提前感谢您的帮助

</header>

<body>

<form action="/demoform/contact_form.php" class="well" id="contactForm" method="post" name="sendMsg" novalidate="">

<big>LOAD PAST ORDERS:</big>
<select id="extrafield1" name="extrafield1">
<option value="">Please select...</option> 
 <option value="xxx">SAMPLE SELECTION</option>
</select>

</br>

<input type="text" required id="mile" name="mile" placeholder="Miles"/>

</br>

<input id="email" name="email" placeholder="Email" required="" type="text" value="demo@gmail.com" readonly="readonly"/>

</br>

<input id="name" name="itemname" placeholder="ITEM NAME 1" required="" type="text" />

</br>

<input type="reset" value="Reset" />


<button type="submit" value="Submit">Submit</button>


</form>


</body>


</html>
表格 

</header>

<body>

<form action="/demoform/contact_form.php" class="well" id="contactForm" method="post" name="sendMsg" novalidate="">

<big>LOAD PAST ORDERS:</big>
<select id="extrafield1" name="extrafield1">
<option value="">Please select...</option> 
 <option value="xxx">SAMPLE SELECTION</option>
</select>

</br>

<input type="text" required id="mile" name="mile" placeholder="Miles"/>

</br>

<input id="email" name="email" placeholder="Email" required="" type="text" value="demo@gmail.com" readonly="readonly"/>

</br>

<input id="name" name="itemname" placeholder="ITEM NAME 1" required="" type="text" />

</br>

<input type="reset" value="Reset" />


<button type="submit" value="Submit">Submit</button>


</form>


</body>


</html>


加载过去的订单：
请选择。。。
样本选择








提交
PHP文件

</header>

<body>

<form action="/demoform/contact_form.php" class="well" id="contactForm" method="post" name="sendMsg" novalidate="">

<big>LOAD PAST ORDERS:</big>
<select id="extrafield1" name="extrafield1">
<option value="">Please select...</option> 
 <option value="xxx">SAMPLE SELECTION</option>
</select>

</br>

<input type="text" required id="mile" name="mile" placeholder="Miles"/>

</br>

<input id="email" name="email" placeholder="Email" required="" type="text" value="demo@gmail.com" readonly="readonly"/>

</br>

<input id="name" name="itemname" placeholder="ITEM NAME 1" required="" type="text" />

</br>

<input type="reset" value="Reset" />


<button type="submit" value="Submit">Submit</button>


</form>


</body>


</html>

<?php

define('DB_NAME', 'xxx');
define('DB_USER', 'xxx');
define('DB_PASSWORD', 'xxx');
define('DB_HOST', 'xxx');

$connection = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD);

if(!$connection){
die('Database connection failed: ' . mysqli_connect_error());
}

$db_selected = mysqli_select_db($connection, DB_NAME);

if(!$db_selected){
die('Can\'t use ' .DB_NAME . ' : ' . mysqli_connect_error());
}

echo 'Connected successfully';

if (isset($_POST['itemname'])){
    $itm = $_POST['itemname'];
}
else {
  $itm = '';
}



if($_POST['mile']){
    $mi = $_POST['mile'];
}else{
    echo "Miles not received";
    exit;
}



if($_POST['email']){
    $email = $_POST['email'];
}else{
    echo "email not received";
    exit;
}




$sql = "INSERT INTO seguin_orders (itemname, mile, email) 
        VALUES ('$itm', '$mi', '$email')";

if (!mysqli_query($connection, $sql)){
die('Error: ' . mysqli_connect_error($connection));
}

我想这会帮助你


</header>

<body>

<form action="/demoform/contact_form.php" class="well" id="contactForm" method="post" name="sendMsg" novalidate="">

<big>LOAD PAST ORDERS:</big>
<select id="extrafield1" name="extrafield1">
<option value="">Please select...</option> 
 <option value="xxx">SAMPLE SELECTION</option>
</select>

</br>

<input type="text" required id="mile" name="mile" placeholder="Miles"/>

</br>

<input id="email" name="email" placeholder="Email" required="" type="text" value="demo@gmail.com" readonly="readonly"/>

</br>

<input id="name" name="itemname" placeholder="ITEM NAME 1" required="" type="text" />

</br>

<input type="reset" value="Reset" />


<button type="submit" value="Submit">Submit</button>


</form>


</body>


</html>



<select id="extrafield1" name="extrafield1">
<option value="">Please select...</option> 
<?php
$query='select * from tablename';
$res=mysql_query($query);
while($row=mysql_fetch_array($res))
{
?>
 <option value="<?php echo $row['feildname']; ?>"><?php echo $row['feildname']; ?></option>
<?php
}
?>
</select>




请选择。。。

使用和