# Coloring selected li **URL:** \ **Category:** Rails\ **Created:** [July 3, 2008, 11:03pm UTC](https://www.ruby-forum.com/t/coloring-selected-li/142160 "2008-07-03T23:03:50Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![rudy](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/5fc32e/32.png) [@rudy](https://www.ruby-forum.com/u/rudy)\ **Post date:** [July 3, 2008, 11:03pm UTC](https://www.ruby-forum.com/t/coloring-selected-li/142160/1 "2008-07-03T23:03:50Z")
Hi, can’t find a solution for this. Have a series of - 's. When the user clicks on one of them, a second series shows in a updated, other . Works fine with RJS. But: I'd like to change the background-color for the - clicked in the first list, so the user can always see and remember which one of the first list he actually has chosen. Sounds simple, but I can't figure it out. I've tried a few :onclick javascript solutions, but they obviously weren't solutioons at all. :- ( Could anybody give me a few hints or so? Thanks in advance. ---
**Author:** ![rudy](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/5fc32e/32.png) [@rudy](https://www.ruby-forum.com/u/rudy)\ **Post date:** [July 3, 2008, 11:07pm UTC](https://www.ruby-forum.com/t/coloring-selected-li/142160/2 "2008-07-03T23:07:57Z")
On Jul 3, 10:02 pm, Rudy [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Hi, can’t find a solution for this. Have a series of > > - 's. When the > user clicks on one of them, a second series shows in a updated, other > > . Works fine with RJS. But: I'd like to change the background-color for the > - clicked in the first list, so the user can always see and remember which one of the first list he actually has chosen. Sounds simple, but I can't figure it out. I've tried a few :onclick javascript solutions, but they obviously weren't solutioons at all. :- You could just add a class to the first li (you could do that with your rjs). If you show what you’ve tried someone might be able to point out where it’s going wrong. Fred ---
**Author:** ![rudy](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/5fc32e/32.png) [@rudy](https://www.ruby-forum.com/u/rudy)\ **Post date:** [July 3, 2008, 11:48pm UTC](https://www.ruby-forum.com/t/coloring-selected-li/142160/3 "2008-07-03T23:48:55Z")
Hi, I have a partial with this code \ - \<%= link\_to\_remote(cup.name, :url =\> {:action =\>'add\_books\_list', :id =\> cup.id}) %\> \<%end%\> lets say whe have 50 cups. There must be an easy way to change the backgroundcolor on the one - that is clicked on, with as little server-activity as possible. I think a javascript-script should do it, but I’m afraid I just don’t have enough knowledge of that. I realise that in a way I have to update the partial, and I’m trying to find an example that could show me, but I just can’t find it. (Or maybe I just think it is easy, but it isn’t.) Thanks for any help anyway. Really appreciate it. ---
**Author:** ![rudy](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/5fc32e/32.png) [@rudy](https://www.ruby-forum.com/u/rudy)\ **Post date:** [July 4, 2008, 12:22am UTC](https://www.ruby-forum.com/t/coloring-selected-li/142160/4 "2008-07-04T00:22:18Z")
On Thu, Jul 3, 2008 at 2:48 PM, Rudy [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > lets say whe have 50 cups. There must be an easy way to change the > backgroundcolor on the one > > - that is clicked on, with as little > server-activity as possible. How about none? 🙂 Briefly tested in FF2/OS X – requires prototype.js – .chosen { background-color: red; } ## HTH, Hassan S. ------------------------ removed\_email\_address@domain.invalid ---
**Author:** ![rudy](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/5fc32e/32.png) [@rudy](https://www.ruby-forum.com/u/rudy)\ **Post date:** [July 4, 2008, 11:20am UTC](https://www.ruby-forum.com/t/coloring-selected-li/142160/5 "2008-07-04T11:20:15Z")
On 04 Jul 2008, at 00:21, Hassan S. wrote: > function choose(e) > } > Event.observe(window,‘load’, init); > > .chosen { background-color: red; } And even better would be to wrap this code in a Javascript object (which prototype conveniently disguises as a Class.create()😉 instead of using simple functions (that’s just as bad as most of the hobby PHP projects you see out there IMHO) and use event delegation. This method will fail as soon as you add list items to the bottom of the list using ajax (since the click event won’t be bound to the new element), forcing you to call the init method again. Also, you are binding an event to each list element, which is quite an expensive operation, and it certainly will become a problem if you have tens to hundreds of these listitems on a page. Best regards Peter De Berdt ---
**Author:** ![rudy](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/5fc32e/32.png) [@rudy](https://www.ruby-forum.com/u/rudy)\ **Post date:** [July 4, 2008, 1:06pm UTC](https://www.ruby-forum.com/t/coloring-selected-li/142160/6 "2008-07-04T13:06:57Z")
# Use javascript , get id and assign a class name . CJ(JON) ---
**Author:** ![rudy](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/5fc32e/32.png) [@rudy](https://www.ruby-forum.com/u/rudy)\ **Post date:** [July 4, 2008, 12:33am UTC](https://www.ruby-forum.com/t/coloring-selected-li/142160/7 "2008-07-04T00:33:25Z")
Absolutely briljant. Many, many thanks. On 4 jul, 00:21, “Hassan S.” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) ---
**Author:** ![rudy](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/5fc32e/32.png) [@rudy](https://www.ruby-forum.com/u/rudy)\ **Post date:** [July 5, 2008, 8:18pm UTC](https://www.ruby-forum.com/t/coloring-selected-li/142160/8 "2008-07-05T20:18:50Z")
On Fri, Jul 4, 2008 at 2:19 AM, Peter De Berdt [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > And even better would be to wrap this code in a Javascript object (which > prototype conveniently disguises as a Class.create()😉 instead of using > simple functions (that’s just as bad as most of the hobby PHP projects you > see out there IMHO) and use event delegation. This method will fail as soon > as you add list items to the bottom of the list using ajax (since the click > event won’t be bound to the new element), forcing you to call the init > method again. Also, you are binding an event to each list element, which is > quite an expensive operation, and it certainly will become a problem if you > have tens to hundreds of these listitems on a page. Wildly overkill for the OP’s situation, I think 🙂 but a valid point for some circumstances. Still, if you have hundreds of list items on a page, I’d be worrying more about the basic IA (or lack thereof)… – Hassan S. ------------------------ removed\_email\_address@domain.invalid