I found this ASCII code that only allows 0-9 but want . And , aswell

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I found this code but am having trouble getting it to accpet . and , aswell.

this is the general code :
let check = (evt.which) ? evt.which : evt.keyCode
if (check > 31 && (check < 48 || check > 57 ))
return false;
return true;

Have I just understood it wrong?

What I have tried:

I have tried:
if (check > 31 && (check < 48 || check > 57 ) || check == 44 || check == 46)

if (check > 31 && (check < 48 || check > 57|| check == 44 || check == 46))

Posted 21-Nov-22 1:04am

Robin Tildeman

Updated 21-Nov-22 1:24am

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3 solutions

Solution 2

You should not use that function, see KeyboardEvent.keyCode - Web APIs | MDN[^]. Also what are those values supposed to represent?

Posted 21-Nov-22 1:22am

Richard MacCutchan

Solution 3

The ASCII code you want are 46 ('.') and 44 (',') so that code should work - I'd suspect that it's the line above or the event you are handling that is causing the problem.

Break out the Javascript debugger (Debug JavaScript - Chrome Developers[^] for Chrome) and start looking at exactly what is in variables while your code executes.

Posted 21-Nov-22 1:24am

OriginalGriff

v2

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CPallini 21-Nov-22 7:35am

Note the if is intended to 'filter-out', rather than 'filter-in', hence OP code should NOT work.

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CPallini · Accepted Answer · 2022-11-21T01:18:00

Solution 1

I would write it this way

JavaScript

let check = (evt.which) ? evt.which : evt.keyCode
if ((check <= 31) || (check >= 48 && check <= 57 ) || (check === 44) || (check === 46))
  return true; // whitelist
return false;

Posted 21-Nov-22 1:18am

CPallini

Updated 21-Nov-22 1:19am

v2