CODEWITHSUNDEEP
javascriptjquery
paradise_lost
paradise_lost

Reputation: 119

JavaScript lastIndexOf()

In C# I can do this

string ID = "ContentPlaceHolderDefault_MainSiteSectionArea_MyPagePlaceHolder_Item4_FavoritAmusementCalender_6_deleteRight_2";   
ID = ID.Substring(ID.LastIndexOf("_") + 1); 

to return the last int 2

How can I most easily do this in jQuery/JavaScript

The id is created dynamic and can for now be up to 3 digit.

Thanks in advance.

Upvotes: 5

Views: 25837

Answers (4)

s3m3n
s3m3n

Reputation: 4197

You should do this with:

function get_last_part(str){
    var split = str.split('_');
    return split[split.length-1];
}
console.log(get_last_part("ContentPlaceHolderDefault_MainSiteSectionArea_MyPagePlaceHolder_Item4_FavoritAmusementCalender_6_deleteRight_2")); // this will write "2" in console

In this way you will get always result and you don't need to concern about out of index problems. This will return always last part of your string, if it doesn't have _ you will get first part of it.

console.log(get_last_part("Content")); // will write "Content" into console

Upvotes: 0

paxdiablo
paxdiablo

Reputation: 881173

JavaScript also has a lastIndexOf() method, see here. You can therefore use:

var str1 = "Blah, blah, blah Calender_6_deleteRight_272";
var str2 = str1.substr (str1.lastIndexOf ("_") + 1);

This gives you 272.

Keep in mind that, if the string doesn't contain an underscore, you'll get the original string back in its entirety. That may or may not be desired in your specific case - you can check the result of the lastIndexOf() call against -1 to detect this.

Upvotes: 5

sgeddes
sgeddes

Reputation: 62831

You were close -- just case sensitive:

ID = ID.substring(ID.lastIndexOf("_") + 1);

JS Fiddle Example

Upvotes: 13

Niet the Dark Absol
Niet the Dark Absol

Reputation: 324620

Have you tried str.substr(-1)?

Upvotes: 0

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