JavaScript indexOf() Method
 JavaScript String Object
Definition and Usage
The indexOf() method returns the position of the first occurrence of a specified value in a string.
This method returns -1 if the value to search for never occurs.
Syntax
| stringObject.indexOf(searchvalue,fromindex) |
| Parameter |
Description |
| searchvalue |
Required. Specifies a value to search for |
| fromindex |
Optional. Specifies where to start the search |
Tips and Notes
Note: The indexOf() method is case sensitive!
Example
Example
Do different searches within a 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:
Try it yourself »
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JavaScript String Object
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