JavaScript substring Method: String Object

Last update on August 19 2022 21:50:37 (UTC/GMT +8 hours)

Description

The substring() method is used to extract a part from a specified string between two given indices.

Version

Implemented in JavaScript 1.0

Syntax

substring(ind1, ind2)

Parameter

ind1, ind2 : An integer between 0 and 1 less than the length of the string.

Note: The substring() extracts characters from ind1 upto but not including ind2.

If ind1 is less than 0 then ind1 automatically set to 0.
If ind2 is greater than the string length then ind2 automatically set to the length of the string.
The function returns an empty string if ind1 is equal to ind2.
If ind2 is not mentioned, ind1 extracts characters to the end of the string.

Example:

The following web document demonstrates how the substring() method can be used in various ways.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"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 - substring() method example</title>
</head>
<body>
<h1 style="color: red">JavaScript String object : substring() method</h1>
<hr />
<script type="text/javascript">
//This is done to make the following JavaScript code compatible to XHTML. <![CDATA[
var str="Javascript"
document.write(str.substring(0,3)+"<br>")
document.write(str.substring(4,7)+"<br>")
document.write(str.substring(7,4)+"<br>")
document.write(str.substring(0,10))
//]]>
</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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