When lost focus from the input box the script will check the URL against its Syntax
$(‘input’).keydown(function() {
if (ischeckUrl($(this))==1){
alert(“enter a valid url…”);
}
});
//function to check URL
function isCheckUrl(checkurl){
if(/^(http|https|ftp)://[a-z0-9]+([-.]{1}[a-z0-9]+)*.[a-z]{2,5}(:[0-9]{1,5})?(/.*)?$/i.test(url)) {
return 1;
} else {
return -1;
}
}