javascript select the part of a string

Question

I have the following HTML:

<li class="workorder" id="workorder_7">

I would like to use the digit after the _ in some javascript. In this case, I need the integer 7

How would I do that?

Thanks!!

bfavaretto · Accepted Answer · 2013-01-09 14:37:23Z

4

There are multiple ways to do that: regular expressions, substring matching, and others. One of the easiest is to just use split to break the string into an array, and grab the last array element:

var str_id = "workorder_7";
var id = str_id.split('_')[1];

You can also use .pop as suggested by VisioN to get the last element from the array. Then it would work with a string with any number of underscores, provided the numeric id is the last one:

var str_id = "main_workorder_7";
var id = str_id.split('_').pop();

edited Jan 9, 2013 at 14:37

answered Jan 9, 2013 at 14:30

bfavaretto

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2 Comments

bfavaretto Over a year ago

@dfsq I'm assuming OP is using a fixed format for the id attributes. But if it's not fixed, you can always assign the return from split in a var and use .length-1 as the index.

VisioN Over a year ago

I'd better use .split("_").pop() instead.

score 1 · Accepted Answer · 2013-01-09 14:37:16Z

1

Another way is to use substring:

var str_id = "workorder_7";
var id = str_id.substring(str_id.indexOf('_') + 1);

If you want to get the content following the last underscore, you can use:

var str_id = "work_order_id_7";
var id = str_id.substring(str_id.lastIndexOf('_') + 1);

edited Jan 9, 2013 at 14:37

answered Jan 9, 2013 at 14:31

user1726343

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