Max_Power_Up

If you check on https://caniuse.com/#feat=fullscreen it shows that IE10 doesn't support the Fullscreen API, so you're not going to win - your best bet is to try to find a polyfill or shim which will allow you to emulate that functionality on older browsers.

Hi, Please change: if($checkresult > 0 ){ echo "Dummy already exist."; } to: if($checkresult > 0 ){ $msg = array('message' => 'Dummy already exists !'); echo json_encode($msg); } You're expecting the server response to always be a json object, so even for errors you'd have to send a json object …