events triggering not on value change

Similar Questions

• Cancel the registration of events does not not to change value

  Cancel the registration of events does not seem to prevent the change in value of firing event.

  I've attached an example of change that disables the mouse enter and exit events to include the value Change event.

  Document ID 4ATCBP1U

  http://digital.NI.com/public.nsf/allkb/E3E5E1B3021D8EFA8625730A0062F52D

  You use the standard event, not the dynamic one (note that the Boolean value does not have the <> ).

• leads the value change in the structure of the event

  Hello

  Please the the VI attached.

  I would like to know what event triggers when the value true or false of the changes led?

  In the case of structure above the structure of the event, the values of true or false of the led are changed.

  From the change, the analog output for Acquisition Card changes. However, the change event of the value in the structure of the event never fires, I know that I run the Vi with the selected highlight enforcement tool.

  Thank you

  Venkat Rao

  Changing the value in an event structure occurs only if one of the two following situations occurs.

  1. the user who modifies the control on front panel.  That may not happen since these LEDs are indicators and does not control.

  2. the program writes a value of property of the Value indicator/control (signalling) node.  Writing to the terminal of the indicator, or the local control variable / indicator not fire the event.  Given that you do not use value property (signalling) nodes in your program from this moment, won't happen either.

  Note that the value change event is a bit misnamed.  The change event is triggered, even if you do not actually change the data.  So if your LED is currently worth, and you write a True Boolean value for the Value property node (signalling), the event always fires even if you're not technically change the data.

• Which situations give an event structure do not capture a Boolean value changes?

  LabVIEW 9 x 86

  Windows 7 x 64

  I have an event structure that works very well.  It has 5 cases, each triggered by a change in value of various indicators.

  I added another case of event, I'm trying to raise the case of the event with the express control "Out of time", I made a deal to raise when the Boolean value "out of time".  The structure of the event does not run when the value changes.

  In addition, once figured out how to make this indicator to trigger structure of the event, I would like to only trigger when the value goes from 0 to 1 and not from 1 to 0

  Search the forums for "event to change value" and "value traffic".

  The value (I guess you have on the structure of your event, bar header you seems to miss information.) the change is triggered only when the user enters new data in a control, or you write a new value programmatically by using the Value property node (signaling).  Completed just by a program written for a local variable, or do not ' value' property node.

  To trigger that in a sense, you can put the code in the event of a case within a case structure so that it runs only when it it True (or False, if that's what it takes.)

• reference, triggering case value change event

  Hello

  I have 2 VI, it has a switch on it and one for the event that watches for a change in value on the toggle switch and if it detects one it turns on a light.

  The second VI reference the first VI and reference of the toggle switch.  This second VI I wish I could switch on or off and have the case of the event in the other VI do its thing.

  This is not the case.  The same case is not catching the failover when I do for one another VI referencing the switch

  is there a workaround to do, a way to make the case event notice that the reference value changes without having to not to use the case of the event?

  Thank you very much!

  You use the Value property (Signaling) to trigger an event of value has changed.

  Lynn

• value chain control event does not trigger change

  Hello

  I am trying to scan a barcode with a barcode usb HID scanner. I use a structure of the event to detect the change in the value of a control of the chain. When I scan the barcode, the chain control updates on the front panel, but the event does not fire until I left on my mouse on the front panel. can someone help? See attached vi

  Your barcodes are probably fixed length. When you get an event, check the length. If it corresponds to the length of the barcode, then process the data, otherwise wait for more characters.  This can be treated very quickly in the case of the event.

  Lynn

• value change event not called on the evolution of the value falling down

  
  Hello

  I have a drop down with values such as... 1-25, 26-50 and so on.

  I need to see the 1-25 as pre-selected when the page is loaded. and when we change the value in the drop down a listner valuechange is called and will service call.

  But when I again selects the default 1-25, at the time where only the value changes listner is not called.

  To show the value that pre-selected I put:-noOfRecSOC.setValue(1);

  noOfRecSOC is the drop down on the screen.

  You must not directly set the value in the UI component. Use the property value drop-down list together for years by default here. Otherwise the value change listener do not notice the change to the original value (as it is never changed).

  You can use a variable temporary pagedef for the value. check out my blog Creating Variables and attribute Bindings to Store values temporarily in the PageDef | JDev & amp; ADF Goodies to find out how to do this.

  Timo

• "Error Out.status": Value change event.

  I get no event that fires when the error on the 'status' change?

  Change event simply write data to a terminal indicator do not have a value.

  The only things that cause a value change event are the user interaction with a control, or by writing to the (signalling) Value property of a control or the indicator.

• [GUI] Cannot filter value change events

  Hello

  In my front panel, there are some controls as in the following image:

  

  I'm not able to do the following:

  when I change the 'value' by arrows button (or by the arrows), I want to change its property "increment" according to the "multiplier value".

  If (multiplier == 1.0)

  value. Increment = 1;

  else value.increment = 0.1

  If I use the "change value" event on the button value, I miss the first update, because the event is processed AFTER the rendering of the GUI of the button. I tried different events, mouse enter and mouse down? but without success.

  All suggest?

  Thank you

  Hi Pierre,.

  See attachment

  I hope that your first time, click on the arrow is now resolved?

• How to reset a while loop based on a value change event?

  Hi all

  I work in a labview program that sends voltage to a laptop via USB 6008, tension is amplified by an op-amp, and then he comes back in the laptop. I created a program and a working circuit, but my current challenge is how to reset the average of the values of voltage coming into the laptop, after that the user changes the digital control (which controls the output voltage). In other words, I need to be able to reset the number of iteration and the sum to 0 each time this happens.

  I looked upward to reset the counters of iteration through shift registers, but I'm not sure it will work in this case, but I'm also not sure how to reset the sum of an array (if possible). I have spent a lot of time to read these forums and tutorials from various sites, so I think it can be done with the correct nesting of the case structures, structures of the event and while loops, but I don't know how. I am new to LV, just started to learn in mid-January, so any help is appreciated.

  Thanks in advance,

  Graeme

  You just need the structure of single event with the bargains.  Use the case of timeout to get your new values and find the average (100ms timeout value and get rid of the wait function (ms)).  Keep the amount and the number of items in the shift registers.  Wire these values through each case of the event.  In the event of changing the value: control, just set the values to 0.  Then add a Stop button value change event to stop your program.

  

  

• How to trigger the value change in the structure of the event

  HII everyone, like the title, how should I trigger the value change event to display a message... Here is my connection... I want to trigger structure of the event to bring up the subvi, when the flame and the led are TRUE State... I have using the node property, but still not able to run event structure... How should I connect? Thank you very much...

  There are several ways you can do. First of all, you need to configure your sub - vi while he does everything you want when you run (in the properties of vi, top most window for example) and to make sure that it closes completely when you're done (when you click on the 'OK' button, for example).

  Spend you need an asynchronous call to the subvi. There are several ways to do so. My favorite one below. You go in the palette under 'Application control' and select a static reference VI. I like this approach because it keeps track of the way subvi for you, as long as the subvi is in the same project. Then, drag the sub - vi on the empty square which will be changes to your sub - vi icon. Then, you connect to an invoke node in the same palette under and select run VI. "Wait, that 's" set to false and the main VI will continue to function after the start of the vi of Sub. Together "Auto Ref" is the best way to go. Otherwise, you will need to follow the sub - vi reference and shut up yourself when you are finished.

  

• How to get the ActiveX component value change event?

  Hi all

  LV 8.6.1

  I try to get the ActiveX component value change event. I covered forum and through examples, but I can't get an idea of how "Recalling vi. For example, in the example 'ActiveX event Callback for IE.vi' it is used "recall vi". I've added an example where the change event of value with the mouse to the bottom of the event are scheduled to the structure of the event. Mouse down event OK work but change the value no. Can anyone describe what I need to add to my example vi who value the change event works fine?

  BR, Jim

  Here is the solution! "Value changed event" is not performed in the structure of the event, but in "Reminder VI".

• Structure of the event run only on first change of the value

  Hi all

  I would like to a structure of the event to run only on the first change of value. I currently put to run on the change in the value of a Boolean value. I'm only interested in what happens the first time that the Boolean value changes; However, he changes several times during a single run of my vi. Is it possible to limit the structure of the event so that it runs only on the first change of value? I have attached the relevant part of my VI. Thank you in advance for any help, you will be able to provide.

  Thank you

  yp21

  
  

• Value change event, be it be programmed to trigger only when the USER changes the value?

  The structure I set up is the following, I have a control in which the user chooses a value when they choose this value, the value change event takes place setting in the device. Then I am bed in unit values and display them in this control via a property node.

  My problem is that whenever I read back a new value in the control, he takes this as a value change event and resets the value within the system, is it possible to make this event don't move when the user changes the value?

  Yes!

  My thoughts are that you use a Value property (signalling) node to display for the control. That will trigger another call to event.

  Use the NO signs of property value node or a local variable.

  Your postal code, if this isn't the case, then we can help you understand what is happening.

• Thread should exit the application, if the event is not triggered for some time

  Hi all

  I want to start the application thread, where I want to check the keypress or the Trackball events. If the event is not triggered for awhile, then the application must close.

  It is possble?

  Thank you

  Use DeviceInfo.getIdleTime () to determine the time of inactivity. You can check it out in a timertask and kill your app with a reminder.