Jquery input value change

Question

When an event happens i want to reduce the value of an input named "shareNum" by 1. This is what i currently use:

$( "#shareNum" ).val(($(this).val-1) );

I get a "NaN" - a non value.. something is wrong, any thoughts?

If someone is able to do the same thing on a <span> tag or any other, that would be great — Tom
– Tom, Commented Apr 16, 2011 at 22:36
It would be almost exactly the same as @Darin's posted answer, except using text() rather than val(). And, obviously, with sanity checks to ensure it's a valid number. — David Thomas
– David Thomas, Commented Apr 16, 2011 at 22:39

Darin Dimitrov · Accepted Answer · 2011-04-16 22:36:28Z

1

Try like this:

var $shareNum = $("#shareNum");
$shareNum.val(Number($shareNum.val()) - 1);

And here's a live demo.

answered Apr 16, 2011 at 22:36

Darin Dimitrov

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2 Comments

@Tom, could you post a JS Fiddle that reproduces the problematic parts of your application?

@Tom, how does the code for your application look like then? Did you check the live demo I provided? How does your code differ?

Šime Vidas · Accepted Answer · 2011-04-16 22:40:08Z

0

This should do it:

$('#shareNum').val(function(i, v) {
    return v - 1;
});

answered Apr 16, 2011 at 22:40

Šime Vidas

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