Javascript 根据表单输入值，2如何生成选择4下拉菜单，其中包含来自数据库的行/记录数据，该数据库将在选中时预先填充表单？_Javascript_Php_Jquery_Mysql_Forms

Javascript 根据表单输入值，2如何生成选择4下拉菜单，其中包含来自数据库的行/记录数据，该数据库将在选中时预先填充表单？

javascript php jquery mysql forms

Javascript 根据表单输入值，2如何生成选择4下拉菜单，其中包含来自数据库的行/记录数据，该数据库将在选中时预先填充表单？,javascript,php,jquery,mysql,forms,Javascript,Php,Jquery,Mysql,Forms,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>

PIC

</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>

</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>

我如何才能只生成与表单输入值“email”匹配的记录以及数据库中“email”列下具有相同值的记录

</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。找不到任何教程网站、视频、示例代码或任何接近如何实现这一点的内容。任何帮助都会很好…提前谢谢你的帮助

</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));
}

看来你就快到了
</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>

试试这个
</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
    $email = $_POST['email'];
    $query="select * from tablename WHERE email={$_POST['email']}";
    $res=mysqli_query($connection,$query);
    while($row = mysqli_fetch_assoc($res))
    {
    ?>
     <option value="<?php echo $row['fieldname']; ?>"><?php echo $row['fieldname']; ?></option>
    <?php
    }
    ?>
</select>


请选择。。。
您正在混合使用mysql和mysqli函数。不正确,没有生成任何选择,谢谢help@BestDayEver2015你最终解决了这个问题还是还需要帮助？嘿，谢谢，我真的很感谢你的时间和努力…我知道你明白了。尝试使用上述代码…但它不起作用。我觉得从你的代码看，它看起来应该能工作，但我不明白为什么不能。所以我建立了另一个演示数据库和表单，并尝试插入上面的代码，但什么都没有。这是我使用的每一段代码的链接。。。这里有一张数据库的图片和一个我试图实现的模型。。。