Decimals can be validated in JavaScript using a regular expression:
document.write(/^-?\d+(\.\d+)?$/.test('15.22'));
Broken down into sections:
^-?\d+ – The string being tested must begin with an optional minus sign, followed by 1 or more digits
(\.\d+)? – Followed by an optional period, which, if present must be followed by 1 or more digits.
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