PHP如何保持单选按钮状态到下一页 [英] PHP How to keep radio button state to the next page

问题描述

我用单选按钮制作了一个表单。如何在用户选择一个选项后保留它的状态？然后在下一页中再次显示相同的表单，并启用用户选择的单选按钮。

// page1.html

 < form method =postaction =page2.html> 
< p> 
< input type =radioname =q1value =A/> 
 A.< br /> 
< input type =radioname =q1value =B/> 
 B.< br /> 
< input type =radioname =q1value =C/> 
 C.< br /> 
< input type =radioname =q1value =D/> 
 D. 
< p> 
< input type =submitname =actionvalue =Enter/> 
< / p> 
< / form> 
  

解决方案

要获取 q1 在下一页中，您可以使用 $ _ POST ['q1'] 。您可以验证该元素是否已发布，并且该值通过使用 if（isset（$ _ POST ['q1']））&&& $ _POST ['q1'] == VALUE 。所以你的表单代码看起来像 -

pre $ lt; code>< input type =radioname =q1value =A <？php if（isset（$ _ POST ['q1']）&&（$ _POST ['q1'] =='A'））echo'checked =checked';？> />
A.< br />
< input type =radioname =q1value =B<？php if（isset（$ _ POST ['q1']）&&（$ _POST ['q1']] =='B'））echo'checked =checked';？> />
B.< br />
< input type =radioname =q1value =C<？php if（isset（$ _ POST ['q1']）&&（$ _POST ['q1']] =='C'））echo'checked =checked';？> />
C.< br />
< input type =radioname =q1value =D<？php if（isset（$ _ POST ['q1']）&&（$ _POST ['q1']] =='D'））echo'checked =checked';？> />

I made a form with radio buttons. How can I preserve it's state after a user picked a choice? Then same form will show again in the next page and the radio button that the user picked is enabled.

//page1.html

<form method="post" action="page2.html">
    <p>
      <input type="radio" name="q1" value="A" />
      A. <br />
      <input type="radio" name="q1" value="B" />
      B. <br />
      <input type="radio" name="q1" value="C" />
      C. <br />
      <input type="radio" name="q1" value="D" />
      D. 
    <p>
      <input type="submit" name="action" value="Enter" />
    </p>
  </form>

解决方案

To get the value of q1 on the next page, you would use $_POST['q1']. You can verify that the element has been posted, and the value matches the specific radio button by using if(isset($_POST['q1'])) && $_POST['q1'] == VALUE. So your form code would look like -

  <input type="radio" name="q1" value="A" <?php if(isset($_POST['q1']) && ($_POST['q1'] == 'A')) echo 'checked="checked" ';?>/>
  A. <br />
  <input type="radio" name="q1" value="B" <?php if(isset($_POST['q1']) && ($_POST['q1'] == 'B')) echo 'checked="checked" ';?>/>
  B. <br />
  <input type="radio" name="q1" value="C" <?php if(isset($_POST['q1']) && ($_POST['q1'] == 'C')) echo 'checked="checked" ';?>/>
  C. <br />
  <input type="radio" name="q1" value="D" <?php if(isset($_POST['q1']) && ($_POST['q1'] == 'D')) echo 'checked="checked" ';?>/>

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