JavaScript substr() Method: String Object
Description
The substr() method returns the characters in a string starting at a specified position and continuing for a specified number of characters.
Version
Implemented in JavaScript 1.0
Syntax
substr(start_pos, length])
Parameter
start_pos: Specifies the position in the string where to begin extracting characters.
length: Specifies the number of characters to extract.
Note:
- start_pos is a character index. The index of the first character is 0, and the index of the last character is 1 less than the length of the string.
- If start_pos is positive and greater than the length of the string, substr() returns no characters.
- If start_pos is negative, substr() uses it as a character index from the end of the string.
- If length is 0 or negative, substr() returns no characters.
- If the length is not defined , start extracts characters to the end of the string.
Example:
The following web document demonstrates how the substr() 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 - substr() method example</title>
</head>
<body>
<h1 style="color: red">JavaScript String object : substr() method</h1>
<hr />
<script type="text/javascript">
//This is done to make the following JavaScript code compatible to XHTML. <![CDATA[
var str = "abcdefghij"
document.write("Original string : "+str+"<br>")
document.write("(1,2) : ", str.substr(1,2)+"<br>")
document.write("(-2,2) : ", str.substr(-2,2)+"<br>")
document.write("(1) : ", str.substr(1)+"<br>")
document.write("(1,20) : ", str.substr(1,20)+"<br>")
document.write("(-20, 2) : ", str.substr(-20,2))
//]]>
</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 |
See also:
JavaScript Core objects, methods, properties.
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