JavaScript parseInt() Function
 Complete Function Reference
Definition and Usage
The parseInt() function parses a string and returns an integer.
The radix parameter is used to specify which numeral system to be used, for
example, a radix of 16 (hexadecimal) indicates that the number in the string
should be parsed from a hexadecimal number to a decimal number.
If the radix parameter is omitted, JavaScript assumes the
following:
- If the string begins with "0x", the radix is 16 (hexadecimal)
- If the string begins with "0", the radix is 8 (octal). This
feature is deprecated
- If the string begins with any other value, the radix is 10 (decimal)
Syntax
| Parameter |
Description |
| string |
Required. The string to be parsed |
| radix |
Optional. A number (from 2 to 36) that represents the
numeral system to be used |
Tips and Notes
Note: Only the first number in the string is returned!
Note: Leading and trailing spaces are allowed.
Note: If the first character cannot be converted to a number,
parseInt() returns NaN.
Example
In this example we will use parseInt() to parse different strings:
<script type="text/javascript">
document.write(parseInt("10") + "<br />");
document.write(parseInt("10.00") + "<br />");
document.write(parseInt("10.33") + "<br />");
document.write(parseInt("34 45 66") + "<br />");
document.write(parseInt(" 60 ") + "<br />");
document.write(parseInt("40 years") + "<br />");
document.write(parseInt("He was 40") + "<br />");
document.write("<br />");
document.write(parseInt("10")+ "<br />");
document.write(parseInt("10",10)+ "<br />");
document.write(parseInt("010")+ "<br />");
document.write(parseInt("10",8)+ "<br />");
document.write(parseInt("0x10")+ "<br />");
document.write(parseInt("10",16)+ "<br />");
</script>
|
The output of the code above will be:
10
10
10
34
60
40
NaN
10
10
8
8
16
16
|
Try-It-Yourself Demos
parseInt()
How to use parseInt() to parse different strings.
Complete Function Reference
Reliable, affordable, feature-rich web hosting!
Take the uncertainty out of Web hosting and let
GoDaddy.com
put service, performance and value back in. No matter which
hosting type or plan you choose, your site receives 24/7
maintenance and protection in our world-class data center. Plus,
you get the expert, friendly service you deserve, from the
world's largest hostname provider.
With three plans to choose from and
prices starting at just $4.99 per month, GoDaddy.com is sure to have a plan that's
right-sized and right-priced just for you!
All plans feature FREE 24x7 setup, FREE 24x7 monitoring, best-
of-breed routers, firewalls and servers, 24x7 onsite physical security
and access to our exclusive Go Daddy Hosting Connection, THE place
to install over 30 FREE applications. Virtual Dedicated and Dedicated
Server plans also available.
Visit GoDaddy.com today.
Virtual Dedicated, Dedicated Server and unlimited plans also available.
Save 10% on web hosting - Enter code w3tenoff at checkout
 |
|
Get Your Diploma!
W3Schools' Online Certification Program is the perfect solution for busy
professionals who need to balance work, family, and career building.
The HTML Certificate is for developers who want to document their knowledge of HTML, XHTML, and CSS.
The JavaScript Certificate is for developers who want to document their knowledge of JavaScript and the HTML DOM.
The XML Certificate is for developers who want to document their knowledge of XML, XML DOM and XSLT.
The ASP Certificate is for developers who want to document their knowledge of ASP, SQL, and ADO.
The PHP Certificate is for developers who want to document their knowledge of PHP and SQL (MySQL).
|
|
