Two digits after dot with JavaScript onkeypress event in textbox

Question

I have a textbox on my page. I have a JavaScript that the user just write numbers and dots in the textbox. But unfortunately that's not enough. The user must be limited if it puts a dot then it just can write digits after. Are not there validation controls or ajax tool kit, or do I have to do it on the onkeypress event?

Answer 1

at onblur/onkeyup event of that input:text just check if the entered value match against /\.\d{2}$/ regular expression

Answer 2

you can try this regexp;

function dotdot(val){
    var rx = /\.\./;
    return rx.test(val);
}

This way you can ensure the user doesn't type a dot after another dot.

Answer 3

var textbox = document.getElementById("ele_id");
textbox.addEventListener('keyup',function(e){ 
  console.log(textbox.value.match(/^[0-9]*?\.[0-9]{2}$/)); 
}, false);

just tested it in firefox/firebug, you could use "onkeyup" in html or jquery's bind() to make event handler work in IE