PHP使用<select>更改内容

问题描述：

I have select menu and I want to change content when I change values like jquery but with php. I find this in answers but it doesn't work.

<?php
$page = null;
if(isset($_POST['page'])){
$page = $_POST['page'];
}
switch($page){
case 'page3': include_once('/path/to/page3content.php'); break;
case 'page2': include_once('/path/to/page2content.php'); break;
case 'page1': include_once('/path/to/page1content.php'); break;
default: include_once('/path/to/defaultcontent.php'); break;
}
?>
<form name="myform" action="" method="post">
<select name="page" onchange="this.form.submit()">
    <option value="page1"<?php if($page == "page1"){ echo " selected"; }?>>Page 1</option>
    <option value="page2"<?php if($page == "page2"){ echo " selected";}?>>Page 2</option>
    <option value="page3"<?php if($page == "page3"){ echo " selected";}?>>Page 3</option>
</select>

EDIT: The problem was in my browser. Now content is show before my form I want content to show after </select> How to do this?

我有选择菜单，我想在更改像jquery这样的值但是用php时更改内容。我在答案中找到了这个但它不起作用。 p>

 ＆lt;？php 
 $ page = null; 
if（isset（$ _ POST ['page']）  ）{
 $ page = $ _POST ['page']; 
} 
switch（$ page）{
case'page3'：include_once（'/ path / to / page3content.php'）;  break; 
case'page2'：include_once（'/ path / to / page2content.php'）;  break; 
case'page1'：include_once（'/ path / to / page1content.php'）;  break; 
default：include_once（'/ path / to / defaultcontent.php'）;  break; 
} 
？＆gt; 
＆lt; form name =“myform”action =“”method =“post”＆gt; 
＆lt; select name =“page”onchange =“this.form.submit（）”  ＆gt; 
＆lt; option value =“page1”＆lt;？php if（$ page ==“page1”）{echo“selected”;  }？＆gt;＆gt; Page 1＆lt; / option＆gt; 
＆lt; option value =“page2”＆lt;？php if（$ page ==“page2”）{echo“selected”;}？＆gt;＆gt; Page 2＆lt;  ; / option＆gt; 
＆lt; option value =“page3”＆lt;？php if（$ page ==“page3”）{echo“selected”;}？＆gt;＆gt; Page 3＆lt; / option＆gt; 
＆lt; / 选择＆gt; 
  code>  pre> 
 
   p> 
 
 
编辑：问题发生在我的浏览器中。 现在内容显示在我的表单之前我希望在＆lt; / select＆gt;  code>之后显示内容如何执行此操作？ p> 
  div>

答

if you want to show content after select then update this code

 <?php
session_start();
$page = null;
if (isset($_POST['page'])) {
    $page = $_POST['page'];
    $_SESSION['page'] = $page;
} else {
    $page = $_SESSION['page'];
}

?>
    <form name="myform" action="" method="post">
        <select name="page" onchange="this.form.submit()">
            <option value="page1"<?php if ($page == "page1") {
                echo " selected";
            } ?>>Page 1
            </option>
            <option value="page2"<?php if ($page == "page2") {
                echo " selected";
            } ?>>Page 2
            </option>
            <option value="page3"<?php if ($page == "page3") {
                echo " selected";
            } ?>>Page 3
            </option>
        </select>
    </form>

<?php
switch ($page) {
    case 'page3':
        include_once('/path/to/page3content.php');
        break;
    case 'page2':
        include_once('/path/to/page2content.php');
        break;
    case 'page1':
        include_once('/path/to/page1content.php');
        break;
    default:
        include_once('/path/to/defaultcontent.php');
        break;
}
?>

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