PHP阻止用户粘贴无效字符

Question

I have used this plugin http://itgroup.com.ph/alphanumeric/ so the user types only alphanumeric characters.

But I have found that the user can paste an invalid character and submit it . My question how to prevent him from pasting invalid character or preventing submit or check for invalid character by PHP (server-side)

Answer 1

Try this:

<input type="text" class="alphanumbersOnly" value="" />

jQuery('.alphanumbersOnly').keyup(function () { 
    this.value = this.value.replace(/[^a-zA-Z0-9]/g,'');
});

JSFiddle:

http://jsfiddle.net/jcP7m/2