File APIs for Java Developers
Manipulate DOC, XLS, PPT, PDF and many others from your application.
http://aspose.com/file-tools
The moose likes HTML, CSS and JavaScript and the fly likes jQuery -- does a wrapped set guarantee an order? Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login


Win a copy of JavaScript Promises Essentials this week in the JavaScript forum!
JavaRanch » Java Forums » Engineering » HTML, CSS and JavaScript
Bookmark "jQuery -- does a wrapped set guarantee an order?" Watch "jQuery -- does a wrapped set guarantee an order?" New topic
Author

jQuery -- does a wrapped set guarantee an order?

Michael Matola
whippersnapper
Ranch Hand

Joined: Mar 25, 2001
Posts: 1752
    
    2


So I have a table that displays some columns of numbers and allows users to enter numeric data in some other columns and does all sorts of calculations on these numbers in front-end code. Some calculations go by rows and others by columns. I have it all working very nicely, but I'm now having a crisis of confidence over a couple aspects of it.

(1) In order to treat rows as such, I've used the above code to grab a columns of cells (using classes importantColumn1 and importantColumn2, added to the cells when the table is generated in server-side code) to give table cells ids such as importantColumn1_1, importantColumn1_2, and importantColumn2_1 and importantColumn2_2, and so forth. Later to do some row calculations, I use these ids to gather up all the necessary "row 1", then "row 2" values, and so forth.

(If you're asking yourself the obvious question why I can't I generate anything row-like server-side, it's because this is all coming from a big application framework thingy and given the way it auto-generates table rows when retrieving from a data source I can't.)

For this to work correctly, my code is relying on each() processing the elements in the order they're found on the table (which assumes they're kept in that order in the wrapped set). My question is whether that is a safe assumption.

If it isn't, I've thought of another approach to assigning those pesky ids, starting from the rows.

If folks say, "what's with all these ids anyhow? you should doing things like this..." I'm all ears.

(2) Is it totally cheesy to assign cells a class like "importantColumn1" just to use the class in other code to treat those cells as a column? I also worked out an approach that used column indexing. (Using index() and nth-child() and such and learning about 0-based vs. 1-based indexing. Whee!)
Bear Bibeault
Author and ninkuma
Marshal

Joined: Jan 10, 2002
Posts: 61594
    
  67

Michael Matola wrote:My question is whether that is a safe assumption.

Yes. The elements will be in document order.


[Asking smart questions] [Bear's FrontMan] [About Bear] [Books by Bear]
Michael Matola
whippersnapper
Ranch Hand

Joined: Mar 25, 2001
Posts: 1752
    
    2
Whoa, hey. Thanks for the quick response!

(jQuery has been loads of fun, and your book has been very helpful, Bear.)
 
I agree. Here's the link: http://aspose.com/file-tools
 
subject: jQuery -- does a wrapped set guarantee an order?