表单提交后保持选中单选按钮

Here if i use below code, the second radio button button1 is not sticking on to the user selection after form submit, it changing back to its default checked state.ie answer2. But the first set of radio buttons work fine. If I remove the default checked option from the code, both radio buttons working fine after form submit. How can I keep the radio button checked after form submit while using checked default option for radios

推荐答案

所以，问题是您在表单提交时设置了两次 checked 值，导致选择默认值(从初始表单状态)或已提交的值.

So, the problem is you're setting the checked value twice upon form submission, resulting in selecting either the default value (from initial form state) or the value that has been submitted.

为了使其正常工作，您需要始终使用 PHP 将 checked 值附加到您的单选元素，如下所示:

For this to work correctly, you'd need always use PHP to append the checked value to your radio elements, like this:

<div id="button_set1">
<input onClick="show_seq_lunid();" type="radio" name="button" value="Yes" <?php if(!isset($_POST['button']) || (isset($_POST['button']) && $_POST['button'] == 'Yes')) echo ' checked="checked"'?> /><label>question1</label>   
<input onClick="show_list_lunid();" type="radio" name="button" value="No" <?php if(isset($_POST['button']) && $_POST['button'] == 'No')  echo ' checked="checked"';?> /><label>answer1</label>
</div>

<div id="button_set2">
<input onClick="os_hpux();" type="radio" name="button1" value="Yes" <?php if(isset($_POST['button1']) && $_POST['button1'] == 'Yes')  echo ' checked="checked"';?> /><label>question2</label>   
<input onClick="os_others();" type="radio" name="button1" value="No" <?php if(!isset($_POST['button1']) || (isset($_POST['button1']) && $_POST['button1'] == 'No'))  echo ' checked="checked"';?> /><label>answer2</label>
</div>

这是一个工作预览:http://codepad.viper-7.com/rbInpX

另外，请注意，您使用的是 内联 JavaScript 表示法，通常不鼓励使用这种方式来保持动态 JS 内容分离和更易于管理；-)

Also, please note that you're using inline JavaScript notation which is normally discouraged to keep dynamic JS content separate and more manageable ;-)

这篇关于表单提交后保持选中单选按钮的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持跟版网！