Question

151

Allow only numbers in JavaScript

rated 0 times [ 152] [ 1] / answers: 1 / hits: 16036 / 12 Years ago, wed, june 20, 2012, 12:00:00

Possible Duplicate:

HTML Text Input allow only Numeric input

I used this script

function isNumberKey(evt)

  {

    var e = event || evt; // for trans-browser compatibility

    var charCode = e.which || e.keyCode;                        

    if (charCode > 31 && (charCode < 47 || charCode > 57))

    return false;

    if (e.shiftKey) return false;

    return true;

 }

But this script not working in firefox alone.
Any alternatives to restrict user for shift key in javascript?

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jaylynkarinam

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answered 12 Years ago moriah · Accepted Answer

event is not defined in Firefox, it's breaking your code. Put it after testing for evt:

function isNumberKey(evt)

  {

    var e = evt || window.event; //window.event is safer, thanks @ThiefMaster

    var charCode = e.which || e.keyCode;                        

    if (charCode > 31 && (charCode < 47 || charCode > 57))

    return false;

    if (e.shiftKey) return false;

    return true;

 }

Fiddle

Check your error console next time. :)