Retaining checkbox value of a form after posting
Keep a checkbox selected after validation
For a sticky form, derive the checked attribute from submitted data instead of assuming the field will always be present.
$agreed = isset($_POST['agreed']);
$checked = $agreed ? ' checked' : '';
echo '<input type="checkbox" name="agreed" value="yes"' . $checked . '>';
Use the checkbox?> Use the checkbox in above form and on submit the status of the Checkboxes are retained.
This tutorial is part of the series where we will try to understand how to retain value of every component of a form. You can read our main tutorial on how to retain value for component of a form here.
For a simple sticky form, keep the form and validation on the same page and redisplay the submitted state directly. A redirect is useful for Post/Redirect/Get after a successful action, but ordinary checkbox values do not need to be copied into the URL.
We will use the example of two checkbox but same system can be extended to more than two or single checkbox in a form.
Here is a same-page example. Because unchecked checkboxes are omitted from the request, use
isset() instead of assuming the key exists. Related: JavaScript checkbox handling and HTML forms.
$t1 = isset($_POST['t1']);
$t2 = isset($_POST['t2']);
$t1v = $t1 ? 'checked' : '';
$t2v = $t2 ? 'checked' : '';
echo "<form method='post' action=''>
<input type='checkbox' name='t1' value='yes' $t1v> First
<input type='checkbox' name='t2' value='yes' $t2v> Second
<input type='submit' value='Submit'>
</form>";
PHP Form Managing Radio button using PHP
Subhendu Mohapatra
Author & Instructor at plus2net
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| AARON | 04-01-2019 |
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