jquery parseInt not giving the right result

Question

I am reading a value as

 var result = $("#Time", $(this)).val();

If I enter "Hours" instead of a number , and I do 0<parseInt(result, 10)<24), the result is true when I expect it to be false.

What is wrong with my code?

Note that (once you take David's advice, below) you may want 0 <= rather than 0 <... — nnnnnn
– nnnnnn, Commented Oct 22, 2012 at 7:24

David Hedlund · Accepted Answer · 2012-10-22 07:13:46Z

3

Your first comparison 0 < NaN will yield false, which is sort of 0, therefore 0 < 24, which is true.

var result = parseInt($('#Time', $(this)).val(), 10);
var between0and24 = 0 < result && result < 24

I also note that you seem to be passing context incorrectly. The context parameter to jQuery should be a DOM node, not a jQuery object, so use $('#Time', this). Note that there's no use for that parameter in this code as accessing by ID is really quick as it is, and because you aren't using the Time id for more than one element in the document, right? Well you shouldn't.

answered Oct 22, 2012 at 7:13

David Hedlund

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2 Comments

learning Over a year ago

How can I achieve the result to false?

David Hedlund Over a year ago

@learning: By usign the code in my answer. changing from x < y < z to x < y && y < z.

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