Question

Pros/Cons Absolute Positioning

Asked by: tradeline

We're using Visual Studio to design our html pages, and in order to take advantage of the drag/drop gui, we've enabled absolute positioning.  I've noticed google does this as well in their google suggest drop down.  I've also heard however that there are disadvantages to this approach.

As I'm not a pro web developer, and I'm wondering what are the things to watch out for in this area.

I know not to use tables for my alignment and that css should be used; however, does that mean absolute positioning?

Thanks.

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Asked On
2006-02-06 at 10:53:43ID21725814
Tags

absolute

,

positioning

,

cons

,

css

Topic

Cascading Style Sheets (CSS)

Participating Experts
3
Points
500
Comments
5

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Answers

 

by: D4LyPosted on 2006-02-06 at 13:15:10ID: 15886941

Hi tradeline-

No, using css instead of tables does not mean absolute positioning. I believe Google uses position: absolute for the dropdown menu you see, but it's likely contained within another element with position: relative; applied to it (though this is only a guess based on similar solutions). The absolute positioning of the nested element there simply positions it absolutely in relation to the upper left corner of the parent container and is necessary to achieve the desired effect for them.

_Usually_ there is a better approach to designing in css if you're using position: absolute...and these better approaches usually will look the same across more browsers. IMO, if you're using absolute positioning for everything, it has just as many negatives as using tables. Yes, you may have a lower filesize for your pages using css, but using absolute positioning ruins all flexibility you have with your site design at present and in the future (it will possibly be more difficult to redesign later) Further, with absolute positioning for all of your content you could arrange your content in your source code such that when the styles are turned off, the flow of content is impossible to follow, and the pages may become unreadable. Personally, aside from the filesize you save, designing in css is pointless if you're going to rely on absolute positioning for your layouts.

You should strive to use absolute positioning only when absolutely necessary. Not seeing your specific application, it does sound like one of those _necessary_ cases, as it is how many other live search/drop down/etc... systems tend to be implemented.

Just my 2 cents.

-D4

 

by: HeshaPosted on 2006-02-07 at 06:38:44ID: 15892688

I have'nt tried the new VS 2005 yet, but I know from experience that anything before that should'nt be used for CSS. I would suggest you use the drag and drop to put everything on your page and then redo the positioning with hand coded CSS. You could then use absolute positioning, relative positioning, float, etc. for your layout.

The way you do your layout will depend on what type of layout you want to do. If it's a simple 2 columns layout with an header and a footer, you'll be better off with floating. But if your layout is complexe and require precise positioning, it will be easier with absolutes.

CSS is a wide technologie, here's some web sites that will help you started.
http://www.w3schools.com/css/default.asp CSS references
http://www.csszengarden.com/ Example on how you can change layout by CSS without changing your HTML
http://glish.com/css/ Layout techniques
http://www.alistapart.com/ Advanced uses of CSS and other web technologies

Once you get started with CSS you'll want to check this mailing list for answers : http://css-discuss.incutio.com/

And you can always ask your questions here, we are always happy to help

 

by: macgruderPosted on 2006-02-11 at 01:57:24ID: 15929993

There is nothing wrong with using absolute positioning per se. Since the absolute choice is in the CSS, and is separated from the content if it achieves what you are looking to do then it's absolutely [:-)] fine. However, absolute position does have a couple of disadvantages in terms of what you can actually do with it:

1. Absolutes are 'removed from the flow'. This means that as far as the other elements are concerned the absolutes "don't exist". This is not a problem if

a) you know the size (especially the height) of the absolute element: because you can simply position other elements around it.

OR

b) other elements are not affected by a change in size of the absolute. The classic example is that if you have 2 column plus footer layout, and the height of the columns depends on the content then you can't use absolutes for the 2 columns. Because there is no way to position the footer, because the position of the footer depends on the content.

2. You cannot clear an absolute, but you can clear a float.
This affects 1(b) above.

Conclusion
Use absolutes for elements that exist independently of other elements. If the position of other elements would depend in any way on an element you shouldn't 'absolute' it.

Look at this image:

http://www.j-foto.com/images/17795_0hdmec_o.gif

The blues would be absolute within the yellow element which would be a relative.

The red would be static or relative.

Since we know the size of the blues we can specify the height of the yellow in advance. However, if the blues had unknown height there would be no way to determine the height of the yellow, and absolute would not be possible.

20120131-EE-VQP-002

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