Prevent information from clearing in fields if user enters wrong info in a field

Question

I'm working on a submission form and if someone gets 1 field wrong, it clears all fields and they have to fill out the form all over again. Anyway to keep the information filled in and they just fix the field that was wrong?

Form https://shopkatika.com/katika/sellKatikaProduct

Answer 1

You can set back the same form value which you captured from the post request.

So what you have to do is you need to return the same post data appended with error messages.

eg: $data=[
'username' => 'abc',
'errormsg'=>'invalid'
]

then in HTML file receive that data in a variable

<?php $response = functionName(); ?>

then in the tag value attribute, you add that

<span><?php echo $respose['errormsg'] ?></span>
<input type='text' name='username' id='username' value=<?php echo 
$response['username'] ?> />

so this will throw error message in a span and the input which they gave will also be there in that.

you can use js to vanish error message after 5secs.