CODEWITHSUNDEEP
javascriptjqueryhtml
John Vasiliou
John Vasiliou

Reputation: 997

Removing an integer from an id

I have an id:

div id ="untitled-region-5"

I want to grab that id and remove 4 from it and then do some code with the new id.

So far I am trying something like this from reading about how to perform this: 

var n = $(this).attr('id').match(/untitled-region-(\d+)/)[1];

But I don't know how to remove 4 from the integer.

Upvotes: 2

Views: 93

Answers (3)

MatuDuke
MatuDuke

Reputation: 5008

var id = $("div").attr("id");
var n = parseInt(id.substring(id.lastIndexOf("-") + 1), 10);

I made a jsFiddle too: http://jsfiddle.net/YEWQQ/

Upvotes: 1

bretterer
bretterer

Reputation: 5781

<div id ="untitled-region-5">​

just take n and subtract 4

var n = $('div').attr('id').match(/untitled-region-(\d+)/)[1];
var newNumber = n-4;
$('div').attr('id','untitled-region-'+newNumber);

Upvotes: 1

Guffa
Guffa

Reputation: 700422

It's still a string, that's why you can't easily use it in math. Some operations work, because they will implicitly convert the value to a number.

Use parseInt to explicitly do the conversion, so that you know what you have:

var n = parseInt($(this).attr('id').match(/\d+$/)[0]);
n -= 4;

Upvotes: 4

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