Solved

Get the combined width of multiple siblings (code optimization)

Posted on 2011-09-08
9
244 Views
Last Modified: 2012-08-14
I need to calculate the combined width of multiple list items and in this case I cannot rely on the width of the ul wrapper.

So, I came up with a loop in jQuery. It works.

var $items = $('ul').find('li');
var total_width = 0;

// Loop over each item and add widths up
$items.each(function() {
    total_width += $(this).outerWidth();
});

Open in new window


jsfiddle

While this works, I am just wondering whether this code could be optimized or shortened. Any tips or tricks? Thanks.
0
Comment
Question by:Johan85
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
9 Comments
 
LVL 20

Expert Comment

by:Proculopsis
ID: 36501520

It looks pretty tight but you could use:

$('ul>li');

which is the fastest way to get the li descendants of ul to a single level.
 
0
 
LVL 1

Author Comment

by:Johan85
ID: 36501536
@Proculopsis: Okay, thanks. I was thinking more about an optimization to the loop, though.

Note: in my real code I'm using an id selector. In that case I've learned that the find() function is slightly faster than combining the selectors.

$('#id > .child');
$('#id').find('> .child'); // faster

Open in new window

0
 
LVL 40

Expert Comment

by:gurvinder372
ID: 36501677
why not innerwidth of the 'ul' only??

$("ul").innerWidth();

http://api.jquery.com/innerWidth/

0
The Ultimate Checklist to Optimize Your Website

Websites are getting bigger and complicated by the day. Video, images, custom fonts are all great for showcasing your product/service. But the price to pay in terms of reduced page load times and ultimately, decreased sales, can lead to some difficult decisions about what to cut.

 
LVL 82

Accepted Solution

by:
leakim971 earned 250 total points
ID: 36501716
for example : http://jsfiddle.net/4aqvM/

var x1 = $('ul>li:first');
var x2 = $('ul>li:last');
total_width = x2.position().left - x1.position().left + x2.outerWidth();

$('ul').after('<br>Total li’s width = '+ total_width +'px');

Open in new window

0
 
LVL 1

Author Comment

by:Johan85
ID: 36501744
@gurvinder372: In this particular case the width of the wrapping ul was not usable.

@leakim971: Nice thinking. While not necessarily more beautiful, in my opinion, you managed to get rid of the loop.
0
 
LVL 40

Expert Comment

by:gurvinder372
ID: 36501762
<< In this particular case the width of the wrapping ul was not usable>>
Why is that ??
0
 
LVL 1

Author Comment

by:Johan85
ID: 36501768
@gurvinder: Because I need to set another explicit width to it for layout purposes.
0
 
LVL 40

Expert Comment

by:gurvinder372
ID: 36501803
width and innerWidth are different
0
 
LVL 1

Author Closing Comment

by:Johan85
ID: 36585325
Thanks
0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article will give core knowledge of JavaScript and will head in to your first JavaScript program. I am Durvesh Naik and I am here to deal with this series of JavaScript. I will teach you JavaScript in part wise , as its quite boring to read big…
International Data Corporation (IDC) prognosticates that before the current the year gets over disbursing on IT framework products to be sent in cloud environs will be $37.1B.
The viewer will learn the basics of jQuery, including how to invoke it on a web page. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery.: (CODE)
The viewer will learn the basics of jQuery including how to code hide show and toggles. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery…

707 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question