Pure JavaScript: a function like jQuery's isNumeric() [duplicate]

There's no isNumeric() type of function, but you could add your own:

function isNumeric(n) {
  return !isNaN(parseFloat(n)) && isFinite(n);
}

NOTE: Since parseInt() is not a proper way to check for numeric it should NOT be used.

This should help:

function isNumber(n) {
  return !isNaN(parseFloat(n)) && isFinite(n);
}

Very good link: Validate decimal numbers in JavaScript - IsNumeric()

function IsNumeric(val) {
    return Number(parseFloat(val)) === val;
}

There is Javascript function isNaN which will do that.

isNaN(90)
=>false

so you can check numeric by

!isNaN(90)
=>true

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