JavaScript lastIndexOf() Method: String Object

Last update on August 19 2022 21:51:08 (UTC/GMT +8 hours)

Description

The lastIndexOf() method returns the index within the calling string object of the last occurrence of the specified value. It returns -1 if not found. The calling string is search in reverse order, starting at startIndex.

Version

Implemented in JavaScript 1.0

Syntax

lastIndexOf(searchValue, startIndex)

Parameter

searchValue : A string representing the value to search for.

startIndex : The location in the string to search the specified value. Location value is an integer between 0 and the length of the string. The default value is 0.

Example:

In the following web document lastIndexOf() method is used to locate values in a given string.

"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
<title>JavaScript String object - lastIndexOf() method example</title>
</head>
<body>
<h1 style="color: red">JavaScript String object : lastIndexOf() method</h1>
<hr />
<script type="text/javascript">
//This is done to make the following JavaScript code compatible to XHTML. <![CDATA[
var str="Learn Javascript";
document.write(str.lastIndexOf("Learn") + "<br />");
document.write(str.lastIndexOf("Javascript")+"<br />");
document.write(str.lastIndexOf("Easily"));
//]]>
</script>
</body>
</html>

View the example in the browser

Supported Browser

Internet Explorer 7	Firefox 3.6	Google Chrome 7	Safari 5.0.1	Opera 10
Yes	Yes	Yes	Yes	Yes

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