Events node is empty

Similar Questions

• How to determine if event.result is empty?

  I have a remoteObject call that returns the results of the query (event.result).  I am interested to know how to I can determine whether event.result is empty (no return value).

  if(Event.Result == null) did not work for me.

  Now, I know that I could pass the values of the event.result to an arrayCollection collection and ask if ac.length == 0, but I would avoid it if possible.

  Any help is appreciated.  Thank you.

  If event.result is an array, you can check event.result.length == 0.

• How to test for the node XML empty?

  If (selectedImage.detail! = "")
  
  works with
  < picture detail = "" >
  < / image >
  
  but not
  
  < image >
  < detail > < / details >
  < / image >
  
  
  Hope that makes sense for a person, can't think really how to explain it better, I'm sure it's a fairly simple thing
  
  

  Quote:
  Posted by: ntsiii
  I did not understand. You try to search the nodes in detail where the text node is empty?
  Tracy

  Yes - for that I can't ignore explicitly their.

  Seems that all I had to do was if(!selectedImage.detail)

  Thanks for the reply - despite my not knowing how to phrase the question.

• DAQmx property in event node can % 27T be update

  I want to update the node property of DAQmx event to update dynamically the value, but only 1 of the 2 property node can be updated "DAQmx is task Done.vi", the whole could be triged normally.

  As shown in the photo below: report cyclic case can be triged and run, but the value of property not upgrade vi DAQmx. well frequency one normally.

  

  

  

  The answer is probably more strange than you expect.  It turns out that the two impulses of the synchronization frequency and duty cycle parameters are also privileged.  (I believe that the same kind of asymmetry applies when you set a pulse with high and low time).

  Frequency Gets the privilege in this sense the pulses of timing is changed only when a frequency value is written.  In order to change the operating factor, you need to get a property node DAQmx Channel, expose the properties of duty cycle and frequency and write to both of them.  You don't need to change the * value * you write in the property of frequency, but you * need to write for her.   Given that written node property follow these up and down, it is important to have the property of cyclical report above the frequency property.

  Here is a more complete article.

  -Kevin P

• value of property not generating a signal event node

  I have a sample program that uses a property node > Value (Signaling) to generate an event.  The property looks like this:

  When I create a VI to do the same thing, the property node looks like this:

  I click with the right button on the Boolean control, create, node, value property (Signaling) to create the node.

  My VI does not generate an event when a value of TRUE is passed to the property node.  Is it possible to change the Boolean Data Type?  What is the problem?

  shall12 wrote:

  My VI does not generate an event when a value of TRUE is passed to the property node.  Is it possible to change the Boolean Data Type?  What is the problem?

  If the data type of the property value node does not resemble boolean (i.e. purple instead of green), you must change the mechanical action of the Boolean because it is currently latch action. Change the mechanical action to switch the action and you should be OK.

  Also note that a value property (sgnl) fires the event to change value unconditionally, even if a new value of the former are the same.

  (If you want to be able to raise Boolean lock action events as you describe here, consider a vote for this idea. )

• Event.currentTarget - empty?

  Currently, search software solution Blackberry Browser and discovered a problem.  I'm creating a html input via asp.net text and attach an onchange event to the list.  Onchange I simply want to view the id of the text box that generated was shot the onchange

  Attempts...

  Alert (Event.currentTarget); alert = empty

  Alert (Event.currentTarget.ID); No is no alert.  I suppose, that an exception is thrown behind the scene.

  Anyone care to comment on RIM?  How can I get the id of the element that raised the event?  The best method would be W3C compliant.

  Thank you

  smorton

  I tried onchange = "foo (event.currentTarget.id)" and it worked well (note the tiny 'e' in the event). "

• How do reset you waveform empty table?

  I have a VI with a waveform graph in the WHILE loop, and every time I have to STOP the vi and re - start, the old data remains on the screen and moves only new data is collected.  These old data persistent even after that the VI is closed and reopened.

  Is there a way to delete the old data whenever the VI is run, in other words to make the empty screen, the default value of the waveform graph?  At the present time, everytime I open and run the VI, there is a wavy line in the display of data unnecessary or off collected comments before, and it would be cleaner and less complicated if there was no old data displayed there.

  Thank you

  Dave

  Do your really want to delete the history of the ranking with each iteration of the loop?  Move the property node and empty the array outside the loop.

  Lynn

• registration / strangeness event management

  Hi all

  I just stumbled upon something weired with recording of the event and handling.

  In my project (it comes to AF, but this is probably not relevant to the question) I'm passing some clusters/paintings reference UI control to a sub - vi for the recording of dynamic events and handling. I have attatched a screenshot of the central part of the subvi.

  The function "Save for events" has a number of entries (~ 25) but most of the work as expected and the events seem to be properly taken into account.

  However the last couple of objects seems not to register at all, although the references passed to the function 'Register' are correct and the events are defined in the structure of the event. I even tried plugging a reference from the VI even to see if it would work, but the problem really seems to be somewhere between the 'register of events' and the structure of the event.

  Height of the green marked event events are handled OK, red, those that are not processed at all for unclear reasons. It seems to be independent of the type of event.

  (I don't join the VI because it has too many dependencies).

  Did someone encountered a similar problem again? Something obvious I might have forgotten?

  Thank you.

  Please check the registry for the events node does not create an error. I think there is like a property and an element node that causes an error prevents the node of the completion. Order of execution is top-> down.

  Norbert

• Can I use Ctlref in a structure of the event with a mouse to an event?

  I have a large number of controls on a front panel. I use a structure of the event that triggers the movement of a given motor when you press the corresponding button. However, I would like to avoid creating events for identical most of N, so I relied on the use of a mouse down on the front panel event, then retrieve the reference command using the Ctlref node (with gives 'Reference to the control on which the event occurred', according to manual labview) and analyze an array of references to know which engine is supposed to move. However, it seems that this node is not (contrary to what the manual said).

  I found other ways to do what I need (I thought using a table containing details of my controls and the coords in the structure of the event node), but I wanted to know why I can't find this node (that is displayed for the event "value change" for example). I'm using Labview 2013.

  No luck for you. Mouse down on the Panel does not have the refnum control because it does not work on a control. Mouse down on a control has it, and since you can configure the mouse down events on multiple controls in the same case of event, it also provides a refnum of control so that you can still use the order in question.

  This is probably also the question that Jeff might have seen. When you set up multiple events for the same frame that LabVIEW displays only the terminal event that are present in all of these events. Terminals that do not exist in at least a specific event of the multiple events for this image are more selectable.

• An extension not appearing IPTC information is not in the correct place in the Iptc4xmpExt:Event metadata

  Salvation of the France.

  This is a technical point...

  Step by step:

  -with a software dam (IDimager) external, I attribute the event ("Iptc4xmpExt:Event") tag with, say, 'TEST', in a jpg file.

  -I update the file, and then close IDimager.

  -J' I opened PS, open the jpg file and watch its information (file > information)

  Under "IPTC Extension", the 'Event' box is empty... No more 'TEST '. I look at 'Advanced' and I find this:

  > no Extension of "IPTC"

  > a new entry, called the "Scheme (h**p://iptc.org/std/Iptc4xmpExt/1.0/2008-02.29/); under this heading, I see: "Iptc4xmpExt_1_:Event" with the value 'TEST' [I replaced the "tt" of "http" with "*" to avoid creating a link]

  If I check the tag event with another program (XnView that lets see the XMP, or the free and excellent EXIFTool), everything is fine. There is no problem with this mysterious "_1_" added by PS at the end of the tag name of the event.

  Any idea?

  It seems that your dam program uses a different schema, the schema used with Photoshop is...

  'http://iptc.org/std/Iptc4xmpExt/2008-02-29/'.

  Note that your program dam has a 1.0 before the date.

• When turn on the App Tabs?

  I checked the 'what are App Tabs?' and read the following descriptions:

  App Tabs will inform you with a blue highlight when they change.

  • If you have Gmail as a tab App, for example, and you use a different tab when a new message is received, your Gmail tab lights.

  I wonder the meaning of 'change' because after I pinned Weibo.com(largest in China's twitter-like site) as a tab App, new messages will not tab look different. So I would like to know if there is an API to do the job, or it's just the service customized for Web sites limited only by Firefox itself. Thank you!

  Quite simply, the blue highlight is caused by a change in title.
  It was a fix implemented in response to the bug "App Tabs should indicate the change in status in < title >".

  For evidence of the above, enter the code here JavaScript in the address bar and press ENTER.
  The App tab will then turn blue whenever it loses focus, until it is then regenerated.

  Brief explanation:
  The code adds an event listener to change the title of a random number whenever the tab is changed (ie. a blur of the event). The empty container sets the return value to the undefined, so the content of the document is not changed (it would be otherwise).
  JavaScript is a scripting language client (user-end) that may alter the HTML (Web site) for the duration of a single page-side (that is to say until a new page is loaded / the same page is reloaded) and is integrated in all popular browsers, as well as the ability to access through the ' javascript: ' Protocol address.

  In the case of weibo.com, you would do well to have a look at the extension greasemonkey for firefox, and either create your own script or to persuade a friendly JavaScript coder to make one for you, that changes the title whenever a new message is received.

• Block diagram WARNING

  With warnings on, I get a "event data node: cluster not named or duplicate the caveat of the items appointed for each case of the event with the details of 'the cluster being bundled or unbundled by name a items without name or elements with the same name.'" I can't find the reason to do so. Clues? LV2011

  I was able to reproduce using two approaches.

  (1) allow to see the caution and then restart LV

  (2) add a dynamic events node and reg driver to the same. After checking in, we get the message. Check with float-over wiretool help shows that it is lableld.

  Next

  (1) sign up for a change in value of a cluster on the FP.

  Warnins appear only after a backup.

  So far, it seems that all this cluster invloved in case of operation (not the data passed through) gives me the error.

  I checked the change in value of cluster event in LV 6i and it's there then...

  I call it a bug.

  R & D he'll probably call a nucence bug, but it's a bug.

  Ben

• Comments on the Code

  Hi guys,.

  I'm a 2 weeks of simple DAQ + forums 1 month free self-taught labview user and I'm working on a fairly large control application.

  Before we continue, I think I have produced a fairly large part of one of the components of my application - it is responsible to control the engines.

  I want to make sure it is sturdy and uses a good style.

  Can someone out there can quickly point out some stylistic mistakes? Don't waste your time on this if you are busy - do it just for fun.

  Notes:

  --> References are from 1 file main VI that uses SET CTR.

  --> I used a VI model because I want to call this function 4 times - for 4 different engines with a different axis (or address).

  --> I am still quite confused on the events node - because I can't seem to find a way to get an event fires when an exchange value of reference. Signs of triggers on each entry - that is not my goal.

  --> Also, I have yet to test queues, nor have I ever used before cue, labview help me come through it.

  --> Is 1 VI which calls a few SUB Vi, some of them extremely simple, others who are a few deep layers. All screws SUB don't use references, events or something of the sort, they are the flow of data simple and loops to step through the code in a structured maner (creating data in a readable format, read, write, etc. etc.)

  I am worried, I just have bad style or do some things that can cause fatal errors.

  Thank you!

  PS: I remember Altenbach give me a bunch of stuff earlier on my code - it really helped push me forward.

  

  

  
  

• XML parsing error

  Hi all

  I need to use XML to store program data. In the attached example, I save a path to an XML file, so that my program remember last used folder for export.

  This simple XML file format is as follows:

  
  -
  C:\Users\AJ\Desktop
  
  

  At another time in my main program, an exception occurs when you try to update the XML file with the new path and I end up with the current XML:

  
  -
  
  
  

  I am trying to try to detect if the ExportFolder text node is empty, then add a default path:

  

  The if statement works, but I can't find a way to update the XML file and analyze a next under ExportFolder element node.

  Any help will be greatly appreciated.

  Best regards

  AJ

  Found a solution for this. for those who may have a similar problem, it worked for me:

• Data on 'Back' button pressure only when the cursor is in the text field

  All,

  With the help of members of the forum, I understood how to use the 'Touch down?' event to send text series when the user presses the button «Back»  Is there any way I can limit this function so that the data is only sent when the cursor is in or on the correct text box AND the user presses the return key?

  Thank you very much.

  You will be most of the way, if you change the event handled in a key event down to the control of the string, rather than for all VI.  This way, you haven't really even to worry about key priorities.  You have control over the "Limit to the single line" value chain so the new line in fact will not be added to the string, but you will always have the event.

  The other problem is that you read the value of string outside of the structure of the event, so the value you write to the indicator will be flawed when it is written.  The string value is not actually until you press the Enter key.  The event fires at the point where you hit enter so that it uses the value that is on the line at the time, which is the value before you hit enter, then your indicator gets old.  There are several possible solutions.  A simple, but not necessarily good option must set "Update of value while typing" and assumes that the user will always wait for at least 10 ms between the last strike and enter.  Of course, if you increase the timeout value you may miss some characters, and there isn't really a need for a case of timeout to all in the structure of your event (just another case for the power button).  Putting control of the Terminal string inside the structure of the event does not solve the problem - again, the event occurs before the new value is treated - but, oddly enough, reading the value of a property within the structure of the event node works (while reading a local variable does not work).  It could also save a dynamic event that triggers the update based on the control indicator.  You can add a registry to offset Boolean to act as a flag and handle the case of the value has changed for the control of the chain as well.  In the case of the value has changed, if the Boolean value is set, updated to the indicator and always set to Boolean false.

  Sorry it's all rather complicated, there are quirks to LabVIEW treatment event.  Reliable the more straightforward approach is probably reading the control value of the string to a property node in the case of the event.  While property nodes are not generally recommended, especially for obtaining or the settting a value when the terminal is on the same side, in this case I think that it is the least complicated solution.