如何在提交后将值保留在其字段中？

Question

   <form action='checks.php' method='POST'>
    <div class ="bookinform">
      <table>
         <tr>
            <td>Name of Driver *</td>
            <td>
               <input type='Text' id="driver_name" name='driver_name' required autocomplete="off" size='7' maxlength='25' style='width:400px;font-family:Century Gothic' value = "">
            </td>
         </tr>
         <tr>
            <td>&nbsp;</td>
            <td></td>
         </tr>
         <tr>
            <td>Vehicle Reg *</td>
            <td>
               <input type='Text' id="Vehicle_Reg" name='Vehicle_Reg' required autocomplete="off" size='7' maxlength='15' style='width:400px;font-family:Century Gothic; text-transform:uppercase;' value = "">
            </td>
         </tr>
         <tr>
            <td>&nbsp;</td>
            <td></td>
         </tr>
         <tr>
            <td valign='top'>Haulier *</td>
            <td valign='top'>
              <input type='Text' id="query" name='haulier' style='width:400px; font-family:Century Gothic; text-transform:uppercase;' value = "">

         <tr>
            <td>&nbsp;</td>
            <td></td>
         </tr>

         </table>

     <input type='submit' name='FORM' value="Book-in Piece/s" style='width:100%;font-family:Century Gothic; margin-top:10px; color:#2EFE2E;'>
   </form>

如何保持输入的值Name of drive,Vehicle reg并Haulier在按下提交按钮后保持在那里？我想要这样,所以不必连续输入.我的表单已经作为一个动作去了,所以我可以$_POST在这个页面上使用？

Answer 1

您需要做的就是检查该输入的值是否已被POST编辑,如果有,则查看echo该值.

为此,请在val属性中添加:

<?php if(isset($_POST["name_of_input"])) echo $_POST["name_of_input"]; ?>

......或使用三元运算符:

<?php echo(isset($_POST["name_of_input"]) ? $_POST["name_of_input"] : ""); ?>

使用输出也是一种好习惯,htmlspecialchars()因为某些POST内容可能包含无效的HTML.

完整的例子

<input type='Text'
    id="driver_name"
    name='driver_name'
    required
    autocomplete="off"
    size='7'
    maxlength='25'
    style='width:400px;font-family:Century Gothic'
    value="<?php echo (isset($_POST["driver_name"]) ? htmlspecialchars($_POST["driver_name"]) : ""); ?>">