Button state change event

Hi,
i need a simple way to check not the state of a button but i need a signal if the state is changed.
And is it possible i need the same to check if a number changed.
Thanks
Florian

Typically, you would use a shift register, then compare the current with the previous value using "not equal". It will be true whenever the data has changed from the previous iteration.
You could also use an event strucure with "value changed". It will fire whenever the control is changed by the operator.
As an alternative, there is an openG tool has a "data changed?" node for this purpose. ( www.openg.org ).
LabVIEW Champion . Do more with less code and in less time .

Similar Messages

Item state change events - notification not recd when run on nokia phone

I have a Form which implements ItemStateListener and its registered to receive item state change events. The Form has a text field which needs to be enabled/disabled based on certain ChoiceGroup element being selected. The code works fine on emulator, however I don't receive event notification in itemStateChanged() on series 60 nokia devices when a new ChoiceGroup element gets selected. Has anyone faced a similar problem? Is there any solution for this? The profile used in my project is CLDC 1.1 and MIDP 2.0.

I faced a similar problem on Motorola ROKR E6. Turned out that ItemStateListener was working only as long as the first form to be displayed remained current -- once I setCurrent another Form, the app stopped responding to itemStateChanged.
The workaround I adopted was to remove Items from the Form and add new Items, giving the illusion of the next form being displayed. It would be interesting to know whether that works for you and whether anyone has faced the same problem with any other handset.
I have subsequently come to know that Motorola have marked my bug report as "solved" -- but have not offered me any option to update my handset with a bug-free version.
btw, calling setConstraints on a TextField can throw a NullPointerException. My workaround for that was to setText("") in the itemStateChanged in lieu of setConstraints (TextField.UNEDITABLE).
luck, db

Exit loop on button state change

Hello I've attached VI that executes states Setup/Measure/Save/Print and Wait if all other states are finished. How can I implement feature, that if buttons dB/Ohm and IF AUTO/MAN changes their values program execution immediately goes to Setup case.
For example: Measure state is exeuted... I press the button dB/Ohm or IF AUTO/MAN ... Measure state is left in the midle of execution and execution goes to Setup state.... after Setup state is finished program execution goes to the the interrupted state e.g Measure state.
Attachments:
SSM_V1.vi ‏15 KB

You will need to use a producer / consumer architecture.
Here is something I did (its messy, sorry don't have the time to clean it up) to demonstrate what can be done. This is a good architecture for you to follow as it can address most of UI based applications efficiently.
Beginner? Try LabVIEW Basics
Sharing bits of code? Try Snippets or LAVA Code Capture Tool
Have you tried Quick Drop?, Visit QD Community.
Attachments:
SSM_V1.vi ‏23 KB

Radio button state on region load...

Is there a way to set the radio button state (click event) on a region load? The default value of 0 (read-only) works when clicked, but doesn't when the page initially loads, and it's like the button click event needs to take place at the region load time. The values are 1 and 0 set statically if that matters, and the hidden value does not get changed when the radio button with the value of 1 is selected.
The button makes the button visible when 'edit' is selected and the button disappears when 'read-only' is selected which is the expected behavior.
I do have a condition on the 'save' button for the value to not be zero which is based on the value from the radio button.
My gut says it'll be a region header attribute or Java Script sort of thing and I've not found anything so far, and I'm hoping there's an Apex guru out there that has a recommendation.
Thanks in advance!
Matt

I used some source I found on Denes' web site and added the call, but it didn't yield the result I was hoping for.
<script type="text/javascript" language="javascript">
$s('P8_RADIO_BUTTON','0');
function f_showhideButtonRadio(pThis, pValue)
{ var show_or_hide = html_RadioValue(pValue);
if (show_or_hide == 0)
{html_HideElement(pThis);}
else
{html_ShowElement(pThis);}
function f_showhideButtonSelect(pThis, pValue)
{ var show_or_hide = $x(pValue).value;
if (show_or_hide == 0)
{html_HideElement(pThis);}
else
{html_ShowElement(pThis);}
</script>
I'm quite new to the Java Script in Apex, so if I hosed this up, please let me know. Also, does that set the click event on or does that just set the value? The reason I ask is with a 0 or 1 it yielded the same result.
Thanks!
Matt

Val(sgnl) Property of a Button to Fire Event

I'm trying to call a button value change event handler by using the Val(sgnl) property of a button control. Its not working. Ive done this with boolean controls and it works great. The boolean version takes a boolean input while the button version takes a variant - I'm not sure why there is a difference. I tried it by wiring a T/F directly into the property, and using a Data To Variant to convert the input, but neither works.
Thanks,
Bill F

Bill,
I think I have the answer for you. I knew I had done this before so I started to create the attached VI. Well I ran it and got an error, thus I think the answer.
The button can not have a mechanical action of "Latching". If you change the button to switching it should work fine. I have attached a working VI.
Evan
National Instruments
Attachments:
button_event.vi ‏32 KB

X Control Exec State Change with Panel Close

I have an X Control that launches VIs dynamically and loads them into subpanels. If I put this X Control on a VI front panel and that VI has its panel closed, but that panel close event is unhandled so LabVIEW takes the default panel close behavior, the exec state change never fires. If I reopen the VI however, it is stopped. Because of this, my shutdown user event which is sent in the Exec State Change event case never sends and my VI is left running in the background.
Of course, I know the panel event should be handled, but this is about robustness of my X Control, not the panel close event handling. Is there any way I can capture this specific case?
CLA, LabVIEW Versions 2010-2013

DevonR wrote:
Hi,
Thanks for sending in the code. Have you tried implementing an event structure? With an event structure, you can set the event to, “Application Instance Close”, so that you can execute some code when a user executes the Quit LabVIEW function. Please see attached screenshots.
Devon R.
Applications Engineer
National Instruments
This doesn't work because if you close an owning project but not LabVIEW, the refnum goes invalid. However, I got an answer from here that lets me know what I needed to.
CLA, LabVIEW Versions 2010-2013

Catching a state change (enterState/exitState confusion)

So I have an app with very clearly defined states, each represented by a custom component. All the main mxml file does is show the component pertaining to the current state. Each custom component can successfully dispatch a state change event. I have no problems (so far) actually changing between states. The problem is executing particular code inside of the custom component when the state changes. For example, I have a chat lobby component. Each and every time I enter that state, it needs to log in to the server. Whenever I leave that state, it needs to disconnect. I have tried enterState, exitState, hide, show, and nothing seems to work. creationComplete works for logging in, but obviously only the first time. Can somebody please help me understand how to accomplish this? I assume the problem has to do with a misunderstanding of how states and events work. Perhaps the enterState/exitState isn't working in the custom component because the actual state change is taking place in the root application. If that is so, then what can I do inside of the component to catch the entering and exiting? I realize that I could attach code to specific controls that do something specific before emitting the stateChange event, but I would really prefer a global solution if at all possible.
This Flex n00b sincerely appreciates your time and assistance.
Aaron

Hey,
Try to listen the this.addEventListener(StateChangeEvent.CURRENT_STATE_CHANGE,onStateChange) (Do this in the creation complete of the component which is changing the state)event, on handling this find out the current state something like
function onStateChange(evt:StateChangeEvent):void{
if(currentState == 'logoff'){
//do logic
}else if(currentState == 'login'){
//do logic

[Flex 4.5.1] How to prevent Radio Button from being selected when clicked on? No Changing Event?

I have a very common use case where you have a few radio buttons and only one can be selected at a time. Some of them are basic and on click should be selected right away, but other are more complex and open a pop up which requires some additional user selections after which the user selected OK or CANCEL for example and only after that the selection of the radio button should be applied programatically.
So to solve this issue I've come up with 2 workarounds:
1) make the entire group, that holds the radio button, act as a button with buttonMode="true" mouseChildren="false" and programatically change the radio button within it.
2) hold the current radio button selection in a variable and in the changeHandler of that radio button return the selection back to what was selected before. But this also causes a small flickering of the radio button which gets selected and deselected immediately after that.. not cool.
So my question is... is there something I am missing that could do the job without these workarounds... like a Changing event which I use for the ButtonBar but I can't find on the RadioButton or RadioButtonGroup... thanks!

Hi,thanks for the reply. Actually that was my third option, but not sure if it's very good also..
Here is a simple scenario:
User must select between 2 radio buttons:
1) no volume -> sets variable volume=0 and selects the radio button (that is the normal use case)
2) set volume -> opens up a pop up with a list that has a X button to close and 4 options: 25% volume, 50% volume, 75%, 100%
At this point the set volume radio button should not be selected and the user has 2 choices:
-> hit the X button to close - nothing changes and no volume radio button is still selected and volume is still = 0
-> hit one of the volume % buttons -> the set volume radio button gets selected and the variable volume=25/50/75/100 depending on the button selected by the user.
That's a pretty common scenario and it's bugging me that I can't easily alter the radio button selection logic since whenever I click it, it gets selected and I can't put a logic in between in a standard way. This should apply to any component with selection, just like ButtonBar has it with the Changing event.
So is there any other more convenient way to accomplish this scenario that you could recommend?
Thanks!

PSD Rollover Button with image in front stops button from changing state

I have a wide PSD button that changes state when rolled over. I would like to place a PNG image with transparency in some areas over the top of it so that the rollover button shows through the transparent areas of the PNG.
How can you get it to do the rollover effect when the user mouses over the bit of the button that the image is in front of? Is ther a way of making the PNG 'invisible' to the mouse?
I know I could redesign the button so that it includes the image but I'm trying to keep file sizes and load times to a minimum, I use this button a lot on my website with a different on each, and having that number of individual buttons would result in a bloated, slow-loading website.

Hi Abhishek
Thanks for your reply. I was able to achieve the effect I wanted by having the PNG and the PSD Button with the same link and then grouping them. This means I can mouse over the PNG and still get the PSD rollover effect, which is perfect.
However I also have another similar problem. I have some different PSD Rollover Buttons which have some text in front of them (basically it's the button label). On some of these buttons when you roll over the text it prevents the rollover state of the button, and on other buttons the rollover effect occurs as it should, and there doesn't appear to be any consistency about which does what. Grouping or ungrouping doesn't appear to make a difference. Can you help?

State change/transition fires addedToStage/removedFromStage events

Hi,
Not sure if this is intended behaviour, but I noticed that a state transition in my components actually triggers addedToStage/removeFromStage events for objects in that component.
i.e. I've got an application with two components and two states.
Changing states (in the application) has move transitions for both components (one component is like a drawer sliding out and the other makes way for it, but both components were already on the stage before the state change).
When switching between the two states the components that are moved actually also fire the addedToStage/removedFromState events.
Cheers
Skip

Hi Chet,
I just tried setting up a new project to demo this, but (surprise surprise) it seems to work fine now.
I still see it firing in my original project, but I guess that's got to be something I'm doing wrong there.
It'll probably take me some time to plough through it though as the project is pretty large, but will post if I find it (or if i can isolate to a demo project).
Thanks
Skip

Radio Buttons, Global Binding, and Change Event

I have a pair of radio button groups with the same name that I have set to Global binding. The radio buttons in these radio button groups have script in the change event. The problem is, when I click on a button in one group, it doesn't fire the change event in the other one, even though the corresponding button changes. I can work around this, but I'm curious why this doesn't work.

ocen12 is correct - the change event will only fire when a user clicks on the radiobutton. It will not fire when a script changes the value. I tried it here and found that the radio buttons on both groups act like they are under the same exclusion group. Do you see the same thing? If I select a value in the second exclusion group any value I had in the 1st one is gone.
Paul

[svn:osmf:] 14758: Fix FM-556: When MediaPlayer enters error state, capabilities should be set to false, and capability change events should be dispatched.

Revision: 14758
Revision: 14758
Author:   [email protected]
Date:     2010-03-15 12:27:47 -0700 (Mon, 15 Mar 2010)
Log Message:
Fix FM-556: When MediaPlayer enters error state, capabilities should be set to false, and capability change events should be dispatched. Also fixed typo in one of the capability change event names.
Ticket Links:
    http://bugs.adobe.com/jira/browse/FM-556
Modified Paths:
    osmf/trunk/framework/OSMF/org/osmf/events/MediaPlayerCapabilityChangeEvent.as
    osmf/trunk/framework/OSMF/org/osmf/media/MediaPlayer.as
    osmf/trunk/framework/OSMF/org/osmf/net/NetStreamLoadTrait.as
    osmf/trunk/framework/OSMFTest/org/osmf/media/TestMediaPlayer.as

Well, I can tell you that this kind of error is not OS related, but rather a HW thing. It happens where there is a general detection of something going wrong. Sometimes it can happen randomly and might not be an indication of a problem. But sometimes it can be caused by things that are improperly functioning within the system like bad capacitors.
Unfortunately I don't really know what to do about such things except give you machine a proper inspection. But if things are working fine, and continue to do so, I wouldn't worry about it. If it becomes a regular occurance, then I'd worry.

Change nav button state when using SSI

I am going to be redesigning a website soon and I am going to use SSI's. Is there a way to change the state of the nav button in relation to the page that is being viewed if the nav bar is in the SSI? If not, what is the best way to achieve this?
I was thinking that the pages specific to the nav buttons (Home, Contact, etc) can not have the nav bar in the SSI and it must be in the main file. If the design is changed in the future the pages containing specific nav button states must be changed individually.
Thanks for any input.

<script src="SpryAssets/SpryDOMUtils.js" type="text/javascript"></script>
This links to the file that is required for the Spry Element Selector
function InitPage(){
Spry.$$('#MenuBar1 li').forEach(function(node){
    var a=node.getElementsByTagName("a")[0]; // finds all a elements inside the li, but we only want the first so [0]
    if(a.href == window.location){
        Spry.Utils.addClassName(node,"activeMenuItem");
This function checks the list items (li) within div ID MenuBar1 and retrieves the the link within the anchor (a) element. If the link (a.href) is the same as the URL (window.location) then add a class called activeMenuItem to the list item.
Spry.Utils.addLoadListener(InitPage);
When the page loads, this will trigger the function
.activeMenuItem a {
    background:#a59a84 !important;
    color:#ffffff !important;
We need to add style rules for the anchor element within the list item with the class of activeMenuItem.
Gramps

Javascript embedded in button pl/sql event handler not being executed

Javascript calls not working from pl/sql button event handler. What am I missing? Are specific settings needed to execute javascript from pl/sql proceedures?
Example: Want to toggle target='_blank' off and on in a button pl/sql event handler to open url call in new window & then reset when processing submit is done & the app returns to the form.
portal form button's pl/sql submit handler:
begin
htp.p('<script language=JavaScript>') ;
htp.p('this.form.target="_blank"') ;
htp.p('</script>') ;
PORTAL.wwa_app_module.set_target('http://www.oracle.com') ;
htp.p('<script language=JavaScript>') ;
htp.p('this.form.target="_blank"') ;
htp.p('</script>') ;
end ;
Putting the following in the button's javascript on_click event handler works great:
this.form.target='_blank'
to force opening new window with a call in the button's submit pl/sql code via:
PORTAL.wwa_app_module.set_target('http://www.oracle.com') ;
but then the target='_blank' is left on when the submit is done & we return to the form.
putting the above javascript as a function (called fcn_newpage) elsewhere (e.g., after form opens) & calling in the submit pl/sql with
htp.p('fcn_newpage') ;
also doesn't work.
Metalink thought this was an application issue instead of a bug, so thought I'd see if anyone knows what's going wrong here. (Portal 9.0.4.1)

thanks for your discussion of my post.
Please clarify:
"htp.p('fcn_newwindow') sends a string":
What would you suggest the proper syntax for a function fcn_newwindow() call from a pl/sql javascript block that differs from
htp.p('<script language="Javascript">') ;
htp.p('fcn_newwindow');
htp.p('</script>');
or more simply
htp.p('fcn_newwindow') ;
More generally, what I'm trying to figure out is under what conditions javascript is executed, if ever, in the pl/sql of a button (either the submit or custom event handler, depending on the button).
I've seen lots of posts asking how to do a simple htp.p('alert("THIS IS TROUBLE")') ; in a pl/sql event handler for a button on a form, but no description of how this can be done successfully.
In addition to alerts, in my case, I'd like to call a javascript fcn from a pl/sql event handle that would pass a URL (e.g., http://www.oracle.com) where the javascript fcn executed
window.open(URL). The API call to set_target(URL) in pl/sql has no ability to open in a new window, so calling that is inadequate to my needs and I must resort to javascript.
Its clear in the PL/SQL of a button, you can effect form components since p_session..set_target & p_session.get_target set or get the contents of form components.
So to see if javascript ever works, I tried to focus on something simple that only had to set what amounts to an enviromental variable when we returned to the form after a post. I chose to try to change the html value of TARGET from javascript in the PL/SQL button because it doesn't need to be implemented until we finish the post and return to the form.
So I focused on a hack, setting this.form.TARGET='_blank' in the on_click event handler that forced every subsequent URL call or refresh of the form to be a new window. I then wanted to turn off opening new windows once I'd opened the URL call in a new window by setting TARGET='' in the portal form. I can achieve what I want by coding this.form.TARGET='' in the javascript (on_focus, on_change, or on_mousedown, ...) of every form component that might refresh the form. However, that is a ridiculous hack when a simple htp.p('<script>') ; htp.p('this.form.target=""') ; htp.p('</script>') ; at the end of the button's pl/sql event handle should do the same thing reliably if javascript ever works in the pl/sql event handler.
If we didn't have access to form components through p_session calls, I'd assume it was a scope issue (what is available from the pl/sql event handler). But unless my syntax is just off, when, if ever, can javascript be used in a portal form's pl/sql event handler for a button?
if I code a javascript funtion in the forms' pl/sql before displaying form:
htp.p('<script language="JavaScript">') ;
htp.p('function fcn_new_window(URL)') ;
htp.p('window.open(URL)' ) ;
htp.p('</script>') ;
the function can be called from a button's on_click javascript event handler:
fcn_new_window('http://www.oracle.com')
but from the same button's pl/sql submit event handler this call doesn't work: htp.p('fcn_new_window("http://www.oracle.com")')
So my questions remain: Is there other syntax I need, or does javascript ever work properly from the pl/sql of a form button's event handler? If it doesn't work, isn't this a bug that should be fixed by Oracle?
I can probably figure out hacks to make things work the way I need, but executing javascript from pl/sql event handlers seems to be the expected way to affect portal html pages (forms, reports, ...) and it seems not to work as expected. I don't feel I should have to implement hacks for something as simple as calling a javascript function from pl/sql when almost every example I've found in metalink or the forums or Oracle Press's "portal bible" suggests using javascript from pl/sql via the utility htp.p() to effect web page components in portal.
My TAR on the subject, while still open, returned the result basically: "We can reproduce your situation. Everything looks okay to us, but we can't explain how to use javascript where you want or point you to any documentation that would solve your problem or expain why it should not work the way you want it to. We don't feel its a technical issue. Why don't you post the problem on the portal applications forum."
I'm hoping I'm just missing something fundamental and everything will work if I implement it a little differently. So if anyone sees my error, please let me know.
by the way, not sure this is germain, but in reference to your comment:
"redirections in pl/sql procedures give a peculiar result. in a pl/sql procedure, usually, portals give the last redirection statement and ignore anything else coming after it."
if I try to raise an alert:
htp.p('alert("you screwed up")');
return;
in a pl/sql event handler, it still doesn't raise the alert, even though its the last thing implemented in the event handler. But if I set the value of a text box using p_session..set_value_as_string() at the same spot, it correctly sets the text box value when I return to the form.

Possible bug - Missing click event when handling change event

Using Flex 4.5 SDK, I have a spark ComboBox and a Button next to it for applying a filter according to ComboBox selection.
I listen to both the ComboBox's change event & the Button's click event (for different functions).
When I manually delete the ComboBox text value from its TextInput (i.e. changing selected index to -1) and immediately click on the Button,
the click event-handler function is not being called and only the ComboBox's change event-handler function is executed.
(Selecting a value from the ComboBox's list and clicking on the button triggers both methods on the right order.)
There's also a state definition for the module, but it isn't being changed during these operations...
Is this a bug or a correct behavior? Am I missing something here?
Any workaround suggestions?
(I thought of listening also to mouse-down or mouse-up on the button instead, but haven't tried it yet...)
*** UPDATE ***
When using the Button's mouseDown event the behavior is as expected, so there's a simple workaround.
However, it seems to me like there's a bug with the Button's click event listener or something...
*** UPDATE #2 ***
I created a test application for that and couldn't reproduce the problem.
Then I figured out the problem and solved it.
It's a bit emmbarrasing, but I actually disabled the button (enabled=false) as in a child method of the change handling code...
(If there is no value, don't allow applying the filter - It makes sense! )
Anyway... No issue after all.
However, I choose to leave this post (and not delete it) as an example of identifying and resolving a strange behavior in a complex application.

There's no need.
Please read the section UPDATE #2.

Button state change event

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