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Randomly change a record based on time

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srikanth.prodigy

Randomly change a record based on time

Hello All,

How to change a record based on time in Xforms . I have to show each record for every 5 seconds .is there any event in xforms that will trigger based on time

Thanks,

Srikanth

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fl.schmitt(ops-users)

Re: Randomly change a record based on time

Hi Srikanth,

> How to change a record based on time in Xforms . I have to show each
> record for every 5 seconds .is there any event in xforms that will
> trigger based on time

AFAIK there's no "pure xforms" solution for this, but you could use
javascript to generate an event every some seconds. I use a
PeriodicalExecuter [1] provided by the Prototype JavaScript library to
backup the instances in the background every 40 seconds during editing
sessions. On xforms-ready, the following javascript is called:

function initAutoSave() {
var perEx = new PeriodicalExecuter(function(pe) {
ORBEON.xforms.Document.dispatchEvent("main-model",
"autosave");
}, 40);
if (!perEx){
window.alert("Backup im Hintergrund konnte nicht
instantiiert werden!");
return;
} else {
window.status = "Backup im Hintergrund instantiiert!";
}
};

This dispatches a custom event to the xforms model every 40 seconds, and
it's easy to adapt it for other needs. You will have to modify the
epilogue so that the prototype library js file is loaded.

hth
florian

[1] http://www.prototypejs.org/api/periodicalExecuter

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Erik Bruchez

Re: Re: Randomly change a record based on time

Administrator

Florian, Srikanth:

Good advice, but in fact there is an XForms solution, with the XForms
1.1 @delay attribute on xforms:dispatch. Check the dispatch-
delay.xhtml sample in the sandbox. E.g.:

<xforms:dispatch name="my-event" target="my-model" delay="1000"/>

For convenience I pasted the example here:

http://www.pastie.org/400721

-Erik

On Feb 25, 2009, at 11:10 PM, Florian Schmitt wrote:

> Hi Srikanth,
>
>> How to change a record based on time in Xforms . I have to show each
>> record for every 5 seconds .is there any event in xforms that will
>> trigger based on time
>
> AFAIK there's no "pure xforms" solution for this, but you could use
> javascript to generate an event every some seconds. I use a
> PeriodicalExecuter [1] provided by the Prototype JavaScript library to
> backup the instances in the background every 40 seconds during editing
> sessions. On xforms-ready, the following javascript is called:
>
> function initAutoSave() {
> var perEx = new PeriodicalExecuter(function(pe) {
> ORBEON.xforms.Document.dispatchEvent("main-model",
> "autosave");
> }, 40);
> if (!perEx){
> window.alert("Backup im Hintergrund konnte nicht
> instantiiert werden!");
> return;
> } else {
> window.status = "Backup im Hintergrund instantiiert!";
> }
> };
>
> This dispatches a custom event to the xforms model every 40 seconds,
> and
> it's easy to adapt it for other needs. You will have to modify the
> epilogue so that the prototype library js file is loaded.
>
> hth
> florian
>
> [1] http://www.prototypejs.org/api/periodicalExecuter
>
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> mailing list.
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srikanth.prodigy

RE: Re: Re: Randomly change a record based on time

Hello Erik,

Dispatch event is triggered on DOMActivate method. Is there any way to
trigger the dispatch event on page load? I have tried it for xforms ready
and model construct done event it did not help.

Thanks,
Srikanth

-----Original Message-----
From: Erik Bruchez [mailto:[hidden email]]
Sent: Thursday, February 26, 2009 12:57 PM
To: [hidden email]
Subject: [ops-users] Re: Re: Randomly change a record based on time

Florian, Srikanth:

Good advice, but in fact there is an XForms solution, with the XForms
1.1 @delay attribute on xforms:dispatch. Check the dispatch-
delay.xhtml sample in the sandbox. E.g.:

<xforms:dispatch name="my-event" target="my-model" delay="1000"/>

For convenience I pasted the example here:

http://www.pastie.org/400721

-Erik

On Feb 25, 2009, at 11:10 PM, Florian Schmitt wrote:

Alessandro Vernet

Re: RE: Re: Re: Randomly change a record based on time

Administrator

On Feb 26, 2009, at 2:47 AM, Srikanth A wrote:

> Dispatch event is triggered on DOMActivate method. Is there any way to
> trigger the dispatch event on page load? I have tried it for xforms
> ready
> and model construct done event it did not help.

Good catch. Added a bug for this:

http://forge.objectweb.org/tracker/index.php?func=detail&aid=313061&group_id=168&atid=350207

A workaround is to use a <xxforms:script> in your xforms-model-
construct-done which uses a ORBEON.xforms.Document.dispatchEvent()
which in turns run the <xforms:dispatch delay="1000"/>. Yes, this is
not ideal; I agree.

For more on ORBEON.xforms.Document.dispatchEvent(), see:
http://www.orbeon.com/ops/doc/reference-xforms-2#xforms-javascript-events

Alex
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