CODEWITHSUNDEEP
javascriptjqueryarrays
Misha Moroshko
Misha Moroshko

Reputation: 171321

How to check if jQuery object exist in array?

Given an item and an array, I would like to know if item exist in array.

item is a jQuery object, e.g. $(".c"). You can assume that item.length == 1.

array is an array of jQuery objects, e.g. [$(".a"), $(".b")]. Each item in this array may represent 0, 1, or more objects.

Here is how I thought to implement this: (live demo here)

function inArray(item, arr) {
    for (var i = 0; i < arr.length; i++) {
        var items = $.makeArray(arr[i]);

        for (var k = 0; k < items.length; k++) {
            if (items[k] == item[0]) {
                return true;
            }
        }
    }

    return false;
}

Can you find a more elegant implementation?

Example:

HTML:

<div class="a">Hello</div>
<div class="a">Stack</div>
<div class="a">Overflow</div>

<div class="b">Have</div>
<div class="b">a</div>
<div class="b">nice</div>
<div class="b">day!</div>

<div class="c">Bye bye</div>

JS:

console.log(inArray($(".a").eq(2), [$(".a"), $(".b")])); // true
console.log(inArray($(".b").eq(3), [$(".a"), $(".b")])); // true
console.log(inArray($(".c"), [$(".a"), $(".b")]));       // false
console.log(inArray($(".a").eq(2), [$(".b")]));          // false
console.log(inArray($(".a").eq(2), []));                 // false
console.log(inArray($(".c"), [$("div")]));               // true

Upvotes: 8

Views: 33701

Answers (5)

Manjur Gani
Manjur Gani

Reputation: 21

data = [
  {val:'xxx',txt:'yyy'},
  {val:'yyy',txt:'aaa'},
  {val:'bbb',txt:'ccc'}
];

            var dummyArray = [];
            var distinctValueArray = [];

            $.each(data, function (index, firstobject) {
              //push first element of object in both dummy array and distinct array.

               if (index == 0) {
                    distinctValueArray.push(firstobject);
                    dummyArray.push(firstobject.txt);
                }
                else {

                    //started from 2nd index.

                   if ($.inArray(firstobject.txt, dummyArray) == -1) {
                        distinctValueArray.push(firstobject);
                    }
                    dummyArray.push(firstobject.txt);
                }
            });
            dummyArray.length=0;

Upvotes: -1

Kirill Popov
Kirill Popov

Reputation: 1

console.log(!!~$.inArray("a", ["a", "b", "c"]));

Upvotes: 0

Umesh Patil
Umesh Patil

Reputation: 4948

if($.inArray("valueYouWantToFind", nameOfTheArray) == true) {
  Your code;
 }

 Eg.,
 var userChoice = ["yes"];
 if($.inArray('yes',userChoice) == true) {
                    alert("found");
                }

Upvotes: 0

Misha Moroshko
Misha Moroshko

Reputation: 171321

According to Felix's suggestion:

[$(selector1), $(selector2), ... ] can be simplified to 

$(selector1, selector2, ...)

or

$(selector1).add(selector2)...

and then it can be implemented as:

function inArray(item, arr) {
  return (arr.index(item) != -1);
}

Live demo here

Upvotes: 10

Snake Eyes
Snake Eyes

Reputation: 16764

what about 

if(jQuery.inArray(some, array) === -1)
{
//process data if "some" is not in array
}
else
{
//process if "some" is in array
}

read here : http://api.jquery.com/jQuery.inArray/

Upvotes: 8

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