Introduction: In this article I am going to explain how to find
whether specified value/item exists in array or not using jQuery’s $.inArray() or javascript’s indexOf() methods.
In previous articles i explained How to check string as mathematical expression valid or not using jQuery and Javascript to evaluate a string as mathematical expression and Difference between jquery and javascript and Auto resize textarea or asp.net multiline textbox based on content using javascript and Print page content placed inside div tag with print preview using javascript in asp.net
Description: The $.inArray() method is similar to
JavaScript's native .indexOf() method in that it returns -1 when it doesn't
find a match and returns the index of the element if found.
Implementation: Let’s understand by an example.
<html>
<head>
<title></title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script type="text/javascript">
function CheckItem() {
var items = ['chair', 'table', 'carpet', 'fan', 'cooler', 'almirah', 'oven', 'tv'];
var item = $('#txtItem').val();
if ($.inArray(item, items) != -1) // or if (items.indexOf(item) != -1)
{
$('#spnMessage').html(item + ' found');
}
else {
$('#spnMessage').html(item + ' not found');
}
}
</script>
</head>
<body>
<input type="text" id="txtItem" />
<button type="button" onclick="CheckItem();">Submit</button><br /><br />
<span id="spnMessage"></span>
</body>
</html>
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