Components in tabNavigator not initialized
|
View:
New views
7 Messages
—
Rating Filter:
Alert me
|
 |
Components in tabNavigator not initialized
by WillyRay
::
Rate this Message:
Hey guys, Here's the issue: I have a tabNavigator that basically looks like this: <mx:TabNavigator id="tn" > <mx:Canvas id="masterListTab"> <myComps:MasterList id="masterList"/> </mx:Canvas> <mx:Canvas id="detailTab"> <myComps:Details id="details"/> </mx:Canvas> </mx:TabNavigator> My problem is that I need all the components in all the tabs to be not null from the very beginning. I need, for example, to be able to set details.addEventListener() in the creationComplete function of the application... but details is NULL until it's been clicked on. One way might be to refactor the creation of everything here into actionscript, but it would be a long and tedious refactoring, and I don't have the time. Thoughts? Thanks, Willy ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Want to reach the ColdFusion community with something they want? Let them know on the House of Fusion mailing lists Archive: http://www.houseoffusion.com/groups/flex/message.cfm/messageid:6040 Subscription: http://www.houseoffusion.com/groups/flex/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=17837.14401.37 |
|
|
|
|
|
Re: Components in tabNavigator not initialized
by WillyRay
::
Rate this Message:
Oh Yes! That's EXACTLY what I needed! Thank you! /w On Mon, Aug 24, 2009 at 11:26 AM, <brad@...> wrote: > > If I'm following you, I think you need to look into the creationPolity > property. > > http://livedocs.adobe.com/flex/3/html/help.html?content=layoutperformance_05.html > > ~Brad > > -------- Original Message -------- > Subject: Components in tabNavigator not initialized > From: Willy Ray <willyray@...> > Date: Mon, August 24, 2009 11:58 am > To: flex <flex@...> > > > Hey guys, > > Here's the issue: > > I have a tabNavigator that basically looks like this: > > My problem is that I need all the components in all the tabs to be not > null from the very beginning. I need, for example, to be able to set > details.addEventListener() in the creationComplete function of the > application... but details is NULL until it's been clicked on. > > One way might be to refactor the creation of everything here into > actionscript, but it would be a long and tedious refactoring, and I > don't have the time. Thoughts? > > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Want to reach the ColdFusion community with something they want? Let them know on the House of Fusion mailing lists Archive: http://www.houseoffusion.com/groups/flex/message.cfm/messageid:6042 Subscription: http://www.houseoffusion.com/groups/flex/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=17837.14401.37 |
|
|
Re: Components in tabNavigator not initialized
by Douglas Knudsen
::
Rate this Message:
exactly what you don't need actually. :) Although that may work for you, its not a good practice as this turns off the deferred instantiation inherent to TabNavigator among others components. This means that all your tabs are created immediately regardless if they are ever viewed, slowing startup times. Better to use other event such as creationComplete, etc. DK Douglas Knudsen http://www.cubicleman.com this is my signature, like it? On Mon, Aug 24, 2009 at 1:30 PM, Willy Ray <willyray@...> wrote: > > Oh Yes! That's EXACTLY what I needed! Thank you! > > /w > > On Mon, Aug 24, 2009 at 11:26 AM, <brad@...> wrote: > > > > If I'm following you, I think you need to look into the creationPolity > > property. > > > > > http://livedocs.adobe.com/flex/3/html/help.html?content=layoutperformance_05.html > > > > ~Brad > > > > -------- Original Message -------- > > Subject: Components in tabNavigator not initialized > > From: Willy Ray <willyray@...> > > Date: Mon, August 24, 2009 11:58 am > > To: flex <flex@...> > > > > > > Hey guys, > > > > Here's the issue: > > > > I have a tabNavigator that basically looks like this: > > > > My problem is that I need all the components in all the tabs to be not > > null from the very beginning. I need, for example, to be able to set > > details.addEventListener() in the creationComplete function of the > > application... but details is NULL until it's been clicked on. > > > > One way might be to refactor the creation of everything here into > > actionscript, but it would be a long and tedious refactoring, and I > > don't have the time. Thoughts? > > > > > > > > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Want to reach the ColdFusion community with something they want? Let them know on the House of Fusion mailing lists Archive: http://www.houseoffusion.com/groups/flex/message.cfm/messageid:6053 Subscription: http://www.houseoffusion.com/groups/flex/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=17837.14401.37 |
|
|
Re: Components in tabNavigator not initialized
by WillyRay
::
Rate this Message:
Hey DK, You're partly right. In my example, I only had the two tabs, but in my production app, I have many more, and they're all making REST calls periodically once they've been created. The creationPolicy idea was perfect for my example... but not so good for my production problem. creationComplete, however isn't exactly the solution either, in this case. I have two UIComponents with lots of children, nested within a tabNavigator. I need the selections on the first component (which is created when the tabNavigator is created) to set values into a form on the second component. Unfortunately, it isn't created until its tab is clicked. So... I could use it's creationComplete to go to the first component, examine it, get the values I need, but then, when the first component changed, I'd still need to have a method to set the new values... The solution I've settled on, which I discovered on the same pages as the creationPolicy documentation is the createChildrenFromDescriptors method. Basically: parentApplication.creationComplete(function (){ mySecondComponent.createChildrenFromDescriptors(); anyOthersIReallyNeed.createChildrenFromDescriptors(); }; Does that seem reasonable? /willy On Wed, Aug 26, 2009 at 9:29 AM, Douglas Knudsen<douglasknudsen@...> wrote: > > exactly what you don't need actually. :) Although that may work for you, > its not a good practice as this turns off the deferred instantiation > inherent to TabNavigator among others components. This means that all your > tabs are created immediately regardless if they are ever viewed, slowing > startup times. Better to use other event such as creationComplete, etc. > > DK > > Douglas Knudsen > http://www.cubicleman.com > this is my signature, like it? > > > On Mon, Aug 24, 2009 at 1:30 PM, Willy Ray <willyray@...> wrote: > >> >> Oh Yes! That's EXACTLY what I needed! Thank you! >> >> /w >> >> On Mon, Aug 24, 2009 at 11:26 AM, <brad@...> wrote: >> > >> > If I'm following you, I think you need to look into the creationPolity >> > property. >> > >> > >> http://livedocs.adobe.com/flex/3/html/help.html?content=layoutperformance_05.html >> > >> > ~Brad >> > >> > -------- Original Message -------- >> > Subject: Components in tabNavigator not initialized >> > From: Willy Ray <willyray@...> >> > Date: Mon, August 24, 2009 11:58 am >> > To: flex <flex@...> >> > >> > >> > Hey guys, >> > >> > Here's the issue: >> > >> > I have a tabNavigator that basically looks like this: >> > >> > My problem is that I need all the components in all the tabs to be not >> > null from the very beginning. I need, for example, to be able to set >> > details.addEventListener() in the creationComplete function of the >> > application... but details is NULL until it's been clicked on. >> > >> > One way might be to refactor the creation of everything here into >> > actionscript, but it would be a long and tedious refactoring, and I >> > don't have the time. Thoughts? >> > >> > >> > >> > >> >> > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Want to reach the ColdFusion community with something they want? Let them know on the House of Fusion mailing lists Archive: http://www.houseoffusion.com/groups/flex/message.cfm/messageid:6054 Subscription: http://www.houseoffusion.com/groups/flex/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=17837.14401.37 |
|
|
Re: Components in tabNavigator not initialized
by Douglas Knudsen
::
Rate this Message:
no, I'm quite right :) I had written 'such as creationComplete', there are other useful events available too. Your approach is basically the same as creationPolicy="all". This maybe ok if 100% of your users will interact directly with the secondary tabs. " I need the selections on the first component (which is created when the tabNavigator is created) to set values into a form on the second component." This is alarming. Your component in Tab one should never reach out to a component in Tab two. Use events to communicate data upwards. Use injection to communicate properties downwards. So in your case the form in tab one would throw a event up to the parent of the Tab Navigator where a event handler can then set the properties in the secondary tab. It is in this handler you could use createChildrenFromDescriptors() on the second tab, then set the properties. Or just set the selectedIndex and a anonymous function handler on creationComplete to inject the variables. Or heck, use binding! Binding is great in these situations. Jeffry Houser has a nice preso around on Bullet Proofing your components that maybe useful here. I don't have a link handy to the first part of this preso though, sorry. DK Douglas Knudsen http://www.cubicleman.com this is my signature, like it? On Wed, Aug 26, 2009 at 11:40 AM, Willy Ray <willyray@...> wrote: > > Hey DK, > > You're partly right. In my example, I only had the two tabs, but in > my production app, I have many more, and they're all making REST calls > periodically once they've been created. The creationPolicy idea was > perfect for my example... but not so good for my production problem. > > creationComplete, however isn't exactly the solution either, in this case. > > I have two UIComponents with lots of children, nested within a > tabNavigator. I need the selections on the first component (which is > created when the tabNavigator is created) to set values into a form on > the second component. Unfortunately, it isn't created until its tab > is clicked. So... I could use it's creationComplete to go to the > first component, examine it, get the values I need, but then, when the > first component changed, I'd still need to have a method to set the > new values... > > The solution I've settled on, which I discovered on the same pages as > the creationPolicy documentation is the createChildrenFromDescriptors > method. Basically: > > parentApplication.creationComplete(function (){ > mySecondComponent.createChildrenFromDescriptors(); > anyOthersIReallyNeed.createChildrenFromDescriptors(); > }; > > Does that seem reasonable? > > /willy > > > On Wed, Aug 26, 2009 at 9:29 AM, Douglas > Knudsen<douglasknudsen@...> wrote: > > > > exactly what you don't need actually. :) Although that may work for you, > > its not a good practice as this turns off the deferred instantiation > > inherent to TabNavigator among others components. This means that all > your > > tabs are created immediately regardless if they are ever viewed, slowing > > startup times. Better to use other event such as creationComplete, etc. > > > > DK > > > > Douglas Knudsen > > http://www.cubicleman.com > > this is my signature, like it? > > > > > > On Mon, Aug 24, 2009 at 1:30 PM, Willy Ray <willyray@...> wrote: > > > >> > >> Oh Yes! That's EXACTLY what I needed! Thank you! > >> > >> /w > >> > >> On Mon, Aug 24, 2009 at 11:26 AM, <brad@...> wrote: > >> > > >> > If I'm following you, I think you need to look into the creationPolity > >> > property. > >> > > >> > > >> > http://livedocs.adobe.com/flex/3/html/help.html?content=layoutperformance_05.html > >> > > >> > ~Brad > >> > > >> > -------- Original Message -------- > >> > Subject: Components in tabNavigator not initialized > >> > From: Willy Ray <willyray@...> > >> > Date: Mon, August 24, 2009 11:58 am > >> > To: flex <flex@...> > >> > > >> > > >> > Hey guys, > >> > > >> > Here's the issue: > >> > > >> > I have a tabNavigator that basically looks like this: > >> > > >> > My problem is that I need all the components in all the tabs to be > not > >> > null from the very beginning. I need, for example, to be able to set > >> > details.addEventListener() in the creationComplete function of the > >> > application... but details is NULL until it's been clicked on. > >> > > >> > One way might be to refactor the creation of everything here into > >> > actionscript, but it would be a long and tedious refactoring, and I > >> > don't have the time. Thoughts? > >> > > >> > > >> > > >> > > >> > >> > > > > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Want to reach the ColdFusion community with something they want? Let them know on the House of Fusion mailing lists Archive: http://www.houseoffusion.com/groups/flex/message.cfm/messageid:6056 Subscription: http://www.houseoffusion.com/groups/flex/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=17837.14401.37 |
|
|
Re: Components in tabNavigator not initialized
by WillyRay
::
Rate this Message:
"So in your case the form in tab one would throw a event up to the parent of the Tab Navigator where a event handler can then set the properties in the secondary tab. " Yeah... It's hard to know how to simplify an example for posting sometimes... Tab 1 is dispatching a custom event full of VO. It gets to the parentApp, where an eventListener has been registered to pass it to a handler. The handler tries to set the values and properties on Tab 2, and this is where I was hitting the null pointer exceptions. "Your approach is basically the same as creationPolicy="all". This maybe ok if 100% of your users will interact directly with the secondary tabs. " " It is in this handler you could use createChildrenFromDescriptors() on the second tab, then set the properties" That makes pretty good sense to me, though I am in a position to guarantee that 100% of the users will run the tabs in question. Your point is well taken, though. Only bring up the children as they're needed... put it in a conditional (tab2==null or something?) at the top of the event handler that handles the assignment from tab 1 to tab 2. I respectfully retract my earlier assertion that you were only "partly" right! ;) (8(|) - D'oh! /w On Thu, Aug 27, 2009 at 7:21 AM, Douglas Knudsen<douglasknudsen@...> wrote: > > no, I'm quite right :) I had written 'such as creationComplete', there are > other useful events available too. Your approach is basically the same as > creationPolicy="all". This maybe ok if 100% of your users will interact > directly with the secondary tabs. > > " I need the selections on the first component (which is > created when the tabNavigator is created) to set values into a form on > the second component." > > This is alarming. Your component in Tab one should never reach out to a > component in Tab two. Use events to communicate data upwards. Use > injection to communicate properties downwards. So in your case the form in > tab one would throw a event up to the parent of the Tab Navigator where a > event handler can then set the properties in the secondary tab. It is in > this handler you could use createChildrenFromDescriptors() on the second > tab, then set the properties. Or just set the selectedIndex and a anonymous > function handler on creationComplete to inject the variables. Or heck, use > binding! Binding is great in these situations. > > Jeffry Houser has a nice preso around on Bullet Proofing your components > that maybe useful here. I don't have a link handy to the first part of this > preso though, sorry. > > DK > > Douglas Knudsen > http://www.cubicleman.com > this is my signature, like it? > > > On Wed, Aug 26, 2009 at 11:40 AM, Willy Ray <willyray@...> wrote: > >> >> Hey DK, >> >> You're partly right. In my example, I only had the two tabs, but in >> my production app, I have many more, and they're all making REST calls >> periodically once they've been created. The creationPolicy idea was >> perfect for my example... but not so good for my production problem. >> >> creationComplete, however isn't exactly the solution either, in this case. >> >> I have two UIComponents with lots of children, nested within a >> tabNavigator. I need the selections on the first component (which is >> created when the tabNavigator is created) to set values into a form on >> the second component. Unfortunately, it isn't created until its tab >> is clicked. So... I could use it's creationComplete to go to the >> first component, examine it, get the values I need, but then, when the >> first component changed, I'd still need to have a method to set the >> new values... >> >> The solution I've settled on, which I discovered on the same pages as >> the creationPolicy documentation is the createChildrenFromDescriptors >> method. Basically: >> >> parentApplication.creationComplete(function (){ >> mySecondComponent.createChildrenFromDescriptors(); >> anyOthersIReallyNeed.createChildrenFromDescriptors(); >> }; >> >> Does that seem reasonable? >> >> /willy >> >> >> On Wed, Aug 26, 2009 at 9:29 AM, Douglas >> Knudsen<douglasknudsen@...> wrote: >> > >> > exactly what you don't need actually. :) Although that may work for you, >> > its not a good practice as this turns off the deferred instantiation >> > inherent to TabNavigator among others components. This means that all >> your >> > tabs are created immediately regardless if they are ever viewed, slowing >> > startup times. Better to use other event such as creationComplete, etc. >> > >> > DK >> > >> > Douglas Knudsen >> > http://www.cubicleman.com >> > this is my signature, like it? >> > >> > >> > On Mon, Aug 24, 2009 at 1:30 PM, Willy Ray <willyray@...> wrote: >> > >> >> >> >> Oh Yes! That's EXACTLY what I needed! Thank you! >> >> >> >> /w >> >> >> >> On Mon, Aug 24, 2009 at 11:26 AM, <brad@...> wrote: >> >> > >> >> > If I'm following you, I think you need to look into the creationPolity >> >> > property. >> >> > >> >> > >> >> >> http://livedocs.adobe.com/flex/3/html/help.html?content=layoutperformance_05.html >> >> > >> >> > ~Brad >> >> > >> >> > -------- Original Message -------- >> >> > Subject: Components in tabNavigator not initialized >> >> > From: Willy Ray <willyray@...> >> >> > Date: Mon, August 24, 2009 11:58 am >> >> > To: flex <flex@...> >> >> > >> >> > >> >> > Hey guys, >> >> > >> >> > Here's the issue: >> >> > >> >> > I have a tabNavigator that basically looks like this: >> >> > >> >> > My problem is that I need all the components in all the tabs to be >> not >> >> > null from the very beginning. I need, for example, to be able to set >> >> > details.addEventListener() in the creationComplete function of the >> >> > application... but details is NULL until it's been clicked on. >> >> > >> >> > One way might be to refactor the creation of everything here into >> >> > actionscript, but it would be a long and tedious refactoring, and I >> >> > don't have the time. Thoughts? >> >> > >> >> > >> >> > >> >> > >> >> >> >> >> > >> > >> >> > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Want to reach the ColdFusion community with something they want? Let them know on the House of Fusion mailing lists Archive: http://www.houseoffusion.com/groups/flex/message.cfm/messageid:6061 Subscription: http://www.houseoffusion.com/groups/flex/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=17837.14401.37 |
| Free embeddable forum powered by Nabble | Forum Help |
