How do I allow only certain numbers to be entered into textbox using keycodes?

Question

1.00/5 (1 vote)

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var specialKeys = new Array();
        specialKeys.push(8); //Backspace
        function IsNumericss(e) {
            var keyCode = e.which ? e.which : e.keyCode
            var ret = ((keyCode >= 49 && keyCode <= 57) || specialKeys.indexOf(keyCode) != -1);
            return ret;
        }

This allows numbers 1-9 only but I need to allow the period also or keycodes 110 & 190.
How would I go about doing this?
I tried something like this but to no avail:

var ret = ((keycode >= 49 && keycode <= 57 && keycode == 110 && keycode == 190)

Posted 29-Dec-14 5:50am

PTG.Jake

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Sergey Alexandrovich Kryukov 29-Dec-14 12:06pm

All you had to to was to think just a bit; you was quite close. :-)
—SA

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Sergey Alexandrovich Kryukov · Answer 1 · 2014-12-29T06:00:00

This is well explained here: http://www.javascripter.net/faq/keyboardinputfiltering.htm[^].

You need to add an additional check.

JavaScript

ret = (49 <= keyCode && keyCode <= 57) ||
      (110 <= keyCode && keyCode <= 190) ||
      (8 == keyCode);

Note that I also removed redundant outer brackets and excluded the use of the array, which you used just for the check for backspace (8), which makes little sense. Keep it simple.

—SA