Ways to Verify the Existence of a Value in an Array Using JavaScript

In my Laravel blade file, I have an array that I am accessing in JavaScript like this:

var data = {!! json_encode($data) !!};

When I check the console, the variable is displayed as seen here: variable data console print

Additionally, I'm retrieving a form input value using the following code:

$("#add-employeeId").val()

The console displays this form input value like so: form input

Now, I want to verify if the form input exists within the data array. Here's how I'm attempting to do it:

function isInArray(arr, search)
{
    return arr.indexOf(search) >= 0;
}

//performing the check
isInArray(data, $("#add-employeeId").val())

However, this validation always returns false even when the value exists. I'd appreciate any insights on what might be causing this issue and what I may be overlooking. Thank you.

Answer №1

When using indexOf(), searchElement is compared to elements of the array with strict equality (the same method as the === or triple-equals operator).

$("#add-employeeId").val()
is outputting a string value, which you are then comparing to integer values.

Your function should look like this:

function isInArray(array, search)
{
    return array.indexOf(parseInt(search)) >= 0;
}

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