如何根据php条件显示和隐藏div [英] How to show and hide div based on php condition

问题描述

我的php代码

<脚本>document.getElementById("loggedin").style.display = 'none';<?php}别的 {echo "未登录";?><脚本语言="javascript">document.getElementById("public").style.display = 'none';<?php}?>

和 html 是

<div style="float:right;display:block;"id="公共"><a href="login_signup/login.php" class="myButton">登录

<div style="float:right;display:block;"id="登录"><a href="login_signup/login.php" class="myButton">登录</a>

我只想一次显示一个 div.如何解决这个问题??但是 php echo 功能是根据条件工作的.

解决方案

不要将 JavaScript 代码放入 PHP 中，只需将 div 放入其中即可.

<li><?phpif(isset($_SESSION["loggedin"]) && $_SESSION["loggedin"] === true) {?><div style="float:right;display:block;"id="登录"><a href="login_signup/login.php" class="myButton">登录</a>

<?php} 别的 {?><div style="float:right;display:block;"id="公共"><a href="login_signup/login.php" class="myButton">登录

<?php}?>

My php code

<?php
session_start();

if(isset($_SESSION["loggedin"]) && $_SESSION["loggedin"] === true){
    echo "logged in";
?>
    <script>
        document.getElementById("loggedin").style.display = 'none';
    </script>
<?php
}
else {
    echo "not logged in";

?>
    <script language="javascript">
        document.getElementById("public").style.display = 'none';
    </script>
<?php
}    
?>

and html is

<li>
        <div style="float:right;display:block;" id="public">
             <a href="login_signup/login.php" class="myButton">   Login   </a>
                     </div>
                     <div style="float:right;display:block;" id="loggedin">
                  <a href="login_signup/login.php" class="myButton">   Loggedin   </a>
                         </div>
                </li>

I just wanna show one div at a time. How to fix this?? However php echo funtion is working based on condition.

解决方案

Instead of putting the JavaScript code inside your PHP, just put the divs in there.

<?php
session_start();
?>

<li>

<?php
if(isset($_SESSION["loggedin"]) && $_SESSION["loggedin"] === true) {
?>

    <div style="float:right;display:block;" id="loggedin">
        <a href="login_signup/login.php" class="myButton">   Loggedin   </a>
    </div>

<?php
} else {
?>

    <div style="float:right;display:block;" id="public">
        <a href="login_signup/login.php" class="myButton">   Login   </a>
    </div>

<?php
}    
?>

</li>

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