Ruby on Rails

On Oct 29, 2010, at 1:00 PM, RobinBrouwer wrote:

> Thank you for your response. I'm using the jQuery rails.js (which uses
> the dom:loaded event) and use :remote => true on the link_to helper to
> set the AJAX links (data-remote="true"). I tested clicking one of
> these AJAX links while the whole page wasn't fully visible yet
> (clicked it VERY fast :P) and it didn't fire the AJAX request but just
> redirected me to the HTML page. But when I wait a little bit it all
> works perfectly. I also thought the dom:loaded event was fired before
> showing the page, but apparently it doesn't in my case. Is anyone else
> having the same issue or is it just me clicking links too fast? ;)
>
> On Oct 29, 6:32 pm, Walter Lee Davis <wa...@wdstudio.com> wrote:
>> On Oct 29, 2010, at 11:40 AM, RobinBrouwer wrote:
>>
>>
>>
>>> Hello fellow Rails programmers,
>>
>>> I really love the new way of AJAX requests in Rails3. It really
>>> cleans
>>> up my HTML code and it makes using AJAX in your application a lot
>>> easier. I only have one - kinda big - problem with it. When the page
>>> is still loading and the user clicks an AJAX link, the AJAX call
>>> will
>>> not be executed and he/she will be redirected to another page.
>>> That's
>>> because the DOM needs to be loaded before all the links get the AJAX
>>> functions attached to them. I know I should also add HTML callbacks
>>> for these links, but for some AJAX links I don't want the user to
>>> see
>>> another page: I want them to see my fancy AJAX and nothing else. I
>>> didn't have this problem when using link_to_remote and wonder if
>>> somebody here knows a solution when using UJS.
>>
>>> I tried adding onclick="return false;" to the links, but the normal
>>> page was still loaded. I asked around for some solutions, but the
>>> best
>>> one I got was adding some <div> over the whole page so all links
>>> can't
>>> be clicked. Then after the DOM is loaded the <div> can be removed.
>>> IMO
>>> that's even worse when it comes to usability, so I wondered if you
>>> people know a fancy solution for my problem.
>>
>>> To sum up my question: I want my AJAX links not clickable until the
>>> DOM is loaded. When the DOM is loaded I want them to have the
>>> standard
>>> AJAX functionality they already have. Any suggestions?
>>
>> If your UJS is wired to the dom:loaded event (Prototype) or the
>> jQuery
>> equivalent, then everything should work even before the page is
>> visible in the browser. How are you wiring these links? The other way
>> to do this is by putting all your script at the bottom of the page,
>> but that can definitely lead to what you describe -- particularly on
>> very heavy pages, where the browser will try to stagger the loading.
>>
>> //load prototype first, then
>> <script type="text/javascript">
>> document.observe('dom:loaded',function(){
>> $('foo').observe('click',function(evt){
>> evt.stop(); //cancel the event
>> //do something wizzy here
>> });});
>>
>> </script>
>> ...bunch of html
>>
>> <a id="foo" href="/bar">baz</a>
>>
>> The dom:loaded stuff gets instantiated in most cases before the
>> browser even gets around to displaying things on the page.
>>
>> Walter
>

Can you post a link that shows this problem? It could be a whole
combination of different things -- browser, platform, connection
speed, etc. I know that jQuery used to be the champ of this particular
trick, and I also know (since I follow that project more closely) that
Prototype had to do a LOT of browser branching to make this particular
part of the library work correctly in all cases. It's possible that
Prototype is better at it at the moment, or that there's something
else about your page that is showing up this problem more clearly. In
any case, it's not been my experience that this would happen. Things
that happen inside the dom:loaded event loop are usually way out there
ahead of the visible page appearing in the browser.

Walter

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