JavaScript to accept only numbers between 0 to 255 range

Question

My Requirement is to validate the ip ranges, I need to create a JavaScript function to accept only numeric and it must allow only between the range 0 to 255. If anything is ente

Answer 1

    function fun_key()
    {
    var key=event.keyCode;
    if(key>=48 && key<=57)
    {
    return true;
    }
    else
    {
    return false;
    alert("please enter only number");
    }
    }

    and you can call this function on keypress event like: