jQuery: how to check if a specific element is already in an array

Question

How can I check if the var element exists or not in the array sites?

var sites = array['test','about','try'];
var element = 'other';

`array('test','about','try');` ? Should it be `new Array(...)` or `[....]` ? — Rayon, Apr 19 '16 at 08:11
It's ***well worth*** your time reading through [the jQuery API](http://api.jquery.com) beginning to end. It takes about an hour, two tops. — T.J. Crowder, Apr 19 '16 at 08:12

Milind Anantwar · Answer 1 · 2016-04-19T08:20:50.067

2

You can use inArray:

Search for a specified value within an array and return its index (or -1 if not found).

var sites = ['test','about','try'];
var element = 'other';
if($.inArray(element ,sites ) >= 0){
  //exists
}

edited Apr 19 '16 at 08:20

answered Apr 19 '16 at 08:10

Milind Anantwar

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it should be `>=` because item can be in 0 position in array. – jcubic Apr 19 '16 at 08:20
@jcubic: thanks. missed `=` operator there – Milind Anantwar Apr 19 '16 at 08:21

score 1 · Accepted Answer · answered Apr 19 '16 at 08:10

1

You can use indexOf() method like following.

if(sites.indexOf(element) > -1) {
    //exist
}

answered Apr 19 '16 at 08:10

Ibrahim Khan

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If IE8 support matters, that would need a polyfill or just use jQuery `$.inArray()` method – A. Wolff Apr 19 '16 at 08:30

score 0 · Answer 3 · edited May 23 '17 at 10:28

0

if (jQuery.inArray(jQuery("input:first").val(), ar) != -1)

The inArray method returns -1 if the element wasn't found in the array, so as your bonus answer to how to determine if an element is not in an array, use this :

if(jQuery.inArray(el,arr) == -1){
    // the element is not in the array
};

Source :JS jQuery - check if value is in array

edited May 23 '17 at 10:28

Community

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answered Apr 19 '16 at 08:11

REDEVI_

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jQuery: how to check if a specific element is already in an array

3 Answers3