在提交另一个表单时使用PHP访问值

Question

我在这里有两个部分，一个是类别部分，另一个是登录部分。我想的是，选择的类别可以在login.php中通过simpe $cat = $_POST['logincategory']; echo $cat;进行访问，但所选择的无线电值是可访问的，并在提交表单的错误显示出来说： Notice: Undefined index: logincategory

<section id="categorysection" action="login.php" form="loginform"> 


     <ul style="font-size:20px; font-color:#000;"> 
      <li> <input type="radio" name="logincategory" value="administrator"> Administrator </li> 
      <li> <input type="radio" name="logincategory" value="director"> Director (IQAC) </li> 
      <li> <input type="radio" name="logincategory" value="vicechancellor"> Vice Chancellor </li> 
      <li> <input type="radio" name="logincategory" value="registrar"> Registrar </li> 
      <li> <input type="radio" name="logincategory" value="facutly"> Faculty/Dept. Representative </li> 
     </ul> 
    <button id="logincategorybutton" type="submit" class="login-button" value="&rarr; Login" hidden>Login</button> 

</section> 
<section id="loginsection" > 
    <form method="post" action="login.php" class="login" id="loginform"> 
    <p> 
     <label for="username" style="color:#000; font-weight:700">Username:</label> 
     <input type="text" name="username" id="username" style="width:300px" required placeholder="enter username" maxlength="20"> 
    </p> 

    <p> 
     <label for="password" style="color:#000; font-weight:700">Password:</label> 
     <input type="password" name="password" id="password" style="width:300px" required placeholder="enter password" maxlength="20"> 
    </p> 

    <p class="login-submit"> 
     <input type="hidden" name="form_token" value="<?php echo $form_token; ?>" /> 
     <button type="submit" class="login-button" onclick="document.getElementById('logincategorybutton').click();" value="&rarr; Login">Login</button> 
    </p> 

    <!-- <p class="forgot-password"><a href="index.html">Forgot your password?</a></p>--> 
    </form> 

    <sup style="color:#000; padding-left:150px;"> ** both username and password must be alpha-numeric between 4-20 characters</sup> 
</section> 



</body> 

编辑：带来了单选按钮形式的标签，仍然面临着同样的问题

<section id="categorysection" > 


     <form form="loginform"> 
     <ul style="font-size:20px; font-color:#000;"> 
      <li> <input type="radio" name="logincategory" value="administrator"> Administrator </li> 
      <li> <input type="radio" name="logincategory" value="director"> Director (IQAC) </li> 
      <li> <input type="radio" name="logincategory" value="vicechancellor"> Vice Chancellor </li> 
      <li> <input type="radio" name="logincategory" value="registrar"> Registrar </li> 
      <li> <input type="radio" name="logincategory" value="facutly"> Faculty/Dept. Representative </li> 
     </ul> 
     </form> 
    <button id="logincategorybutton" type="submit" class="login-button" value="&rarr; Login" hidden>Login</button> 

</section> 

Answer 1

您需要将内形式的单选按钮标签。另外，您不能使用section标签提交表单。

Answer 2

下面是修改后的代码。

所有输入元素都需要封装在表单中。注意我也删除了第二个提交按钮，因为您只需要每个表单一个。

<form method="post" action="login.php" class="login" id="loginform"> 
    <section> 
    <ul style="font-size:20px; font-color:#000;"> 
     <li> <input type="radio" name="logincategory" value="administrator"> Administrator </li> 
     <li> <input type="radio" name="logincategory" value="director"> Director (IQAC) </li> 
     <li> <input type="radio" name="logincategory" value="vicechancellor"> Vice Chancellor </li> 
     <li> <input type="radio" name="logincategory" value="registrar"> Registrar </li> 
     <li> <input type="radio" name="logincategory" value="facutly"> Faculty/Dept. Representative </li> 
    </ul> 
    </section> 
    <section id="loginsection" > 
     <p> 
     <label for="username" style="color:#000; font-weight:700">Username:</label> 
     <input type="text" name="username" id="username" style="width:300px" required placeholder="enter username" maxlength="20"> 
     </p> 
     <p> 
     <label for="password" style="color:#000; font-weight:700">Password:</label> 
     <input type="password" name="password" id="password" style="width:300px" required placeholder="enter password" maxlength="20"> 
     </p> 
     <p class="login-submit"> 
     <input type="hidden" name="form_token" value="<?php echo $form_token; ?>" /> 
     <button type="submit" class="login-button" onclick="document.getElementById('logincategorybutton').click();" value="&rarr; Login">Login</button> 
     </p> 
    <!-- <p class="forgot-password"><a href="index.html">Forgot your password?</a></p>--> 
    <sup style="color:#000; padding-left:150px;"> ** both username and password must be alpha-numeric between 4-20 characters</sup> 
    </section> 
</form> 

Answer 3

<section id="loginsection" > 
    <form method="post" action="login.php" class="login" id="loginform"> 
    <p> 
     <label for="username" style="color:#000; font-weight:700">Username:</label> 
     <input type="text" name="username" id="username" style="width:300px" required placeholder="enter username" maxlength="20"> 
    </p> 

    <p> 
     <label for="password" style="color:#000; font-weight:700">Password:</label> 
     <input type="password" name="password" id="password" style="width:300px" required placeholder="enter password" maxlength="20"> 
    </p> 

    <p class="login-submit"> 
     <input type="hidden" name="form_token" value="<?php echo $form_token; ?>" /> 
     <button type="submit" class="login-button" value="&rarr; Login">Login</button> 
    </p> 

    <!-- <p class="forgot-password"><a href="index.html">Forgot your password?</a></p>--> 
    </form> 

     </section> 






<section id="categorysection" >  

     <form form="loginform"> 
      <ul style="font-size:20px; font-color:#000;"> 
       <li> <input type="radio" form="loginform" name="logincategory" value="administrator"> Administrator </li> 
       <li> <input type="radio" form="loginform" name="logincategory" value="director"> Director (IQAC) </li> 
       <li> <input type="radio" form="loginform" name="logincategory" value="vicechancellor"> Vice Chancellor </li> 
       <li> <input type="radio" form="loginform" name="logincategory" value="registrar"> Registrar </li> 
       <li> <input type="radio" form="loginform" name="logincategory" value="facutly"> Faculty/Dept. Representative </li> 
      </ul> 
     </form>  
</section>