Hi I understand that you want when someone enters a number proceed with all checks, with fake processing action, it should show success just to look like loading something as you said.
Relevant Skills and Experience
I have experience in PHP, MYSQL, JS, AJAX, JQUERY. I can do it by adding the image and showing on the event of user submitting from.
Proposed Milestones
$30 USD - Complete Above Task
I am just Looking forward to have a word with you.