Calculate with string jQuery

Question

So I've got a span that goes like this:

 <span>1</span>

Now I want to do something like this (plus it)

 $(this).next("span").text($(this).next("span").text + 1);

But it won't work. You're seeing where I'm going though, right? I want to make the number in the string or variable go one higher.

How can I do that?

I will, I just can't accept one in 5 minutes, just posted another question ;) — imp
– imp, Commented Oct 12, 2012 at 20:58

j08691 · Accepted Answer · 2012-10-12 20:51:10Z

6

$('span').html( parseInt( $('span').html(),10 ) + 1 );

jsFiddle example

answered Oct 12, 2012 at 20:51

j08691

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3 Comments

Daedalus Over a year ago

@Schart If this answer solved your problem you should accept it by clicking the outlined checkmark below the down arrow.

Orbling Over a year ago

@Schart: The main thing to realise here, is that, unlike PHP (which I presume you are coming from, given the $nexttext thing in your example comment) - JS does not automatically convert variables from text to numbers, you have to do so manually using a set of conversion functions, of which parseInt() is one, parseFloat() is another.

imp Over a year ago

Okay good to know! :) (I haven't accepted yet because I had to wait 5 minutes before accepting another answer)

Palpatim · Accepted Answer · 2012-10-12 20:50:05Z

4

Try the JavaScript parseInt() function. Be sure you properly handle error cases, as in someone putting an invalid integer value into the span.

answered Oct 12, 2012 at 20:50

Palpatim

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3 Comments

imp Over a year ago

I tried : '$nexttext = parseInt($(this).next("span"));' and then '$(this).next("span").text($nexttext + 1);' but it didn't work. It returns NaN

Daedalus Over a year ago

@Schart $nexttext doesn't contain text, but an object. That is why it didn't work.

imp Over a year ago

Okay. Thanks for the parseInt thing though, it will definitely help in the future! :)

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