Jul
JavaScript – Count Array
I’m a PHP man myself however I’ve been playing around with JavaScript a lot lately since I’ve been creating the CRM for our web design company…
A cool little trick I learn’t today (I couldn’t find the answer easy enough in Google so I just figured it out myself) is how to count an array using JavaScript.
In PHP you’d simply write:
<?php
$myarray = array(‘red’, ‘green’, ‘blue’);
echo count($myarray);
?>
This is how you do it in JavaScript:
<script language=”javascript” type=”text/javascript”>
var myarray = new Array(‘red’, ‘green’, ‘blue’);
document.write(myarray.length);
</script>
Hopefully that helps anyone in the same predicament as I was 
About The Author: Ben Sinclair
Ben Sinclair is the Chief Executive Officer of devalog. He is leading a growing team of both designers and technicians ensuring that the same high quality of customer support continues.
View all articles from Ben Sinclair (46)
17.04.08
Thanks alot
02.05.08
Helped me. Thanks.
24.06.08
I was looking for this! tnx!
01.08.08
THANKS, THIS POST SOLVED MY PROBLEM.
26.09.08
thank you very much
22.01.09
Thank you. This lil bit helped me a lot. Loves these little snippets of code-guides.
19.02.09
this give the no of character in an array
var myCars=”sanjitkumarmishra”;
//len = myCars.length;
var myarray = new Array(‘red’, ‘green’, ‘blue’);
var lens = myarray.join();
len = lens.length;
var g=0;
for(i=0;i
28.02.09
Thx a lot!
31.03.09
Thanks this helped me.
06.04.09
Thanks a bunch man. I’ve been looking around for a while. This helps a LOT.
Cheers.
12.10.10
hey thanks for the tip!
03.11.10
thx, this is the stuff I was searching for
greeeetings, yeah
04.11.10
Thanks
21.02.11
Thanks a lot worked for me Info
24.02.11
It only works if you have numbered 0 to n array keys.
If you have an array like:
var arr = new Array();
arr[12] = ‘one’;
arr[34] = ‘two’;
alert (arr.length); // would give you 34 instead of 2
In that case I didn’t find anything besides:
var cnt;
for (k in arr) { cnt++; }