Question

I’ve got an app that users input coordinates into.

In the DB and most mapping software they use the decimal notation for lat/lng (eg. 123.1234) rather than the older format: 34N 40' 50.12"

I need to test that a value input into a form is a float, and not a string. But using parseFloat on 34N 40' 50.12" returns 34– which validates using most tests.

Here’s what I’m trying, which is a mashup of a few really clever solutions found here– but so far I can’t get the thing to work properly for all cases. The basic cases I’m testing for are:

• 123.1234 — valid
• '123.1234' — valid
• 34N 40' 50.12" — invalid
• '34N 40' 50.12"' — invalid
• 123 –valid
• '123' — valid

Here’s a jsfiddle of what I’ve been trying: http://jsfiddle.net/zfwAj/

Answer 1

Seems I should have posted as an answer

isNaN() should work to filter out those ones jsfiddle.net/QYMRe