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JavaScript indexOf() Method

Definition and Usage

The indexOf() method returns the position of the first occurrence of a specified string value in a string.

Syntax

stringObject.indexOf(searchvalue,fromindex)

Parameter Description
searchvalue Required. Specifies a string value to search for
fromindex Optional. Specifies where to start the search


Tips and Notes

Note: The indexOf() method is case sensitive!
Note: This method returns -1 if the string value to search for never occurs.

Example

In this example we will do different searches within a "Hello world!" string:

<script type="text/javascript">
var str="Hello world!";
document.write(str.indexOf("Hello") + "<br />");
document.write(str.indexOf("World") + "<br />");
document.write(str.indexOf("world"));
</script>

The output of the code above will be:

0
-1
6
JavaScript indexOf() Method Reviewed by 1000sourcecodes on 02:07 Rating: 5
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