How to Clear the Numbers..

[Dotnetkanna]

Hi everyone, Help need in javascript,Im having a textbox with combination of special characters and numbers while on pressing the delete key(keycode 46) it should be clear only the numbers and not the special characters..How should i achieve this one.. Thnx in advance.. Regards Kanna

[Torsten Mauz]

The below will work in IE. It will be easy enough to make cross browser - I just don't have the time at the moment (but the same principals will apply).

function checkKey()
{
var key = event.keyCode;
var ch = '';

if (document.selection) 
{
    var sel = document.selection.createRange();
    if(key == 46)
    {
        sel.expand("character");
        ch = sel.text;
        if(isNaN(ch))
            return false;
    }
    if(key == 8)
    {
        sel.move("character", -1);
        sel.expand("character");
        ch = sel.text;
        if(isNaN(ch))
            return false;
    }
}

}

HTH