Numeric Control Disable

Hi, I have a numeric control. I want to disable the option of having the user enter a number and hit enter. I only want them to be able to use the up and down arrows to change the control. Is this possible and how do i implement this? Thanks!

Wait...I posted the wrong one
EDIT: Actually I didn't post the wrong one...When you save this make sure you save it disk then place the control on the front panel....I added it the block diagram via drag/drop, but came in as a constant (which I converted to a control), and it didn't work right....So save it, then add the control to the front panel via the controls pallete.
Message Edited by TWGomez on 04-22-2008 07:15 AM
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using LV 2010 SP 1, Windows 7
Attachments:
Control 1.ctl ‏5 KB

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Disable mouse scroll incrementing on numeric controls?

Is there a way to disable the mouse scroll incrementing on numeric controls? (When the numeric control has KeyFocus and you scroll your mouse it will increment/decrement).
Most of the time it isn't a problem, but if you have a subpanel and you scroll your mouse it will scroll both the subpanel vertical AND increment/decrement a numeric control that has focus.

HI!
I cannot disable mouse scrolling if I use a Slide and Digital Display has focus (see the attachement, please). What am I doing wrong?
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How to create a numeric control (of any type) that can ONLY be increased or decreased by one 'unit' at a time?

As in the title. I wish to create a numeric control (no current limitations on its type) with a range of 1-10 (and a step of 1). The only difficulty I'm having is that the user must only be able to increase or decrease it by 1 at any time. The code initiated by this value change must have completed at least once before the value can be changed again. This is because the VI's code is mostly contained in a while loop, and the control is read once every iteration and its last value must not differ by more than 1.
Is this possible with LabVIEW 6.1 and if so, how?
One of the solutions I've come up with so far is to disable the control immediately after it's read, and to enable it again immediately before it's read for the next time (I have to assume that the user is unable to click twice before the control is disabled). Is this an acceptable method or is there a better way?
I also had an idea of partially disabling a normal numeric control such that it could not be typed in - only the arrows remained operational. However, i don't know quite how to do this.
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Never say "Oops." Always say "Ah, interesting!"
Solved!
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Yes, i realize my solution needs the idea that followed it to be feasable in order to work properly. My bad!
I did wonder about using a combination like that, but I hoped it could all be done with one object. Ah well - just means adding an extra little bit of code. No probs.
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How to stop text labels on numeric controls from disappearing

Got a nuisance problem I'd like to correct. When I've got a previously defined numeric control (such as a slide or knob) with text labels, upon entering the control properties window and selecting the "text labels" tab, the first label defaults to clear/empty. This is a nuisance because the text has to be retyped every time when modifying the text labels. Is this a bug or a feature? Is there any way to turn it off? Thanks.

"I've always wanted to be the first to discover a bug in a new LV release! "
Thank you for sharing that with us. You are helping to make LV even beeter than it is.
regarding your quote "I've always wanted to be the first to discover a bug in a new LV release! "
Please see the LabVIEW Champions Blog titled "The Leaders Lead" that can be found here.
http://forums.lavag.org/blog/champions/index.php?
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How can I highlight the default data in a numeric control when a VI loads.

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Currently the opeator must use the mouse to highlight the zero in the numeric control, type the number and press enter ("next") to advance in the program. I want the operator to be able to simply type the number after the VI loads and press enter. This would require the zero to be highlighted when the VI loads.
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If you set the key focus of the control to true (Right click on
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Can you use the value from a numeric indicator in a numeric control?

Hi!
I have to develop a code where I have to find the maximum value of a waveform and draw a line at 50% of the value. So I chose to find the amplitude of say 10 cycles of waveforms and found the maximum value out of the amplitudes.
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Solved!
Go to Solution.

Hi!
Thank you very much for taking some time out. I have been trying to do this since 2 months and I am stuck right where I am.
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Attachments:
amplitude display.vi ‏217 KB
amplitude display 1.vi ‏148 KB
Using property node.vi ‏56 KB

Programatically bring the cursor to a numerical control while VI running

Does anyone know how to programatically move the cursor to a particular numerical control while a VI is running?
I have a VI that polls the user for information, and at one point, the user has to repeatedly type numbers into the same numerical control and press enter. For a number of reasons, it is awkward to be messing with the mouse during this particular test. Each time the user presses a paricular button to send data a to file (which I have linked to the Return key on the keyboard by means of 'key navigation'), I would like the cursor to jump to the relevant numerical control ready for the next number to be entered on the keyboard. Does anyone have any ideas how to do this?
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Regards,
Will

Will
I'm not sure if this is what you are looking for but it might do what you need.
On the block diagram right click the control in question >>create>>property node>>key focus. Now right click the property node and select Change to write. Wire a boolean true constant to it and place this snippit in the appropriate place(s) in your code depending upon your architecture.
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Default value of a numeric control

Hello I want to fix the default value of a numeric control using his node property but I haven't found this attribute. It's possible to fix this value through the node property of a block?
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Thank you in advance
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The default value is only relevant when the VI is loaded into memory, not every time you start running it. Your code is probably changing the value to some out-of-limit value (probably 0 if your calculations are incorrect) and it is coerced to the minimum. If you want a value to remain constant, don't change it.
The answer is simple - DON'T RUN CONTINUOUSLY! If you want something to repeat, use a loop. That way, the value will only need to be read once, when the VI starts running. If this didn't help you, you should post the VI and explain more about your problem.
To learn more about LabVIEW, I suggest you try searching this site and google for LabVIEW tutorials. Here and here are a couple you can start with. You can also contact your local NI office and join one of their courses.
In addition, I suggest you read the LabVIEW style guide and the LabVIEW user manual (Help>>Search the LabVIEW Bookshelf).
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With Traditional NI-DAQ Compatibility VI's the acquisition locks when I press the increment or decrement button of a numeric control.

Hello all.
I´m using a PCI-6220 and the Traditional NI-DAQ Compatibility VI's to make the acquisition that is in the attached VI. But when I click the increment/decrement button on the numeric controls my acquisition stops. In the same PC I made the same experience with a 6040 and I could not see this problem. I tried with the PCI-6220 with the DaqMX VI's and I could not see this problem too, for these reasons I believe that the problem has something to do with the Traditional NI-DAQ Compatibility VI's.
I built machines that can have one or the other board (depending if it is low-end or normal). Does somebody knows the solution for this problem?
Thanks in advance.
Paulo Carmo
Attachments:
experiencia.vi ‏49 KB

Hello
For what I’ve seen on National web site, using the “Traditional compatibility VI’s”, it sould be possible to control a NI-DAQmx using code written in NI-DAQ Traditional. This information was obtained from the following NI link:
http://digital.ni.com/softlib.nsf/954feaeea92d90918625674b00658b83/9d67f671bcc6850586256e630059308b?...
Please read this information and then tell me something please.
Best regards!

The acquisition locks when I press the increment or decrement button of a numeric control

Hello all.
I´m using a PCI-6220 and the Traditional NI-DAQ Compatibility VI's to make the acquisition that is in the attached VI. But when I click the increment/decrement button on the numeric controls my acquisition stops. In the same PC I made the same experience with a 6040 and I could not see this problem. I tried with the PCI-6220 with the DaqMX VI's and I could not see this problem too, for these reasons I believe that the problem has something to do with the Traditional NI-DAQ Compatibility VI's.
I built machines that can have one or the other board (depending if it is low-end or normal). Does somebody knows the solution for this problem?
Thanks in advance.
Paulo Carmo
Attachments:
experiencia.vi ‏49 KB

Hello
For what I’ve seen on National web site, using the “Traditional compatibility VI’s”, it sould be possible to control a NI-DAQmx using code written in NI-DAQ Traditional. This information was obtained from the following NI link:
http://digital.ni.com/softlib.nsf/954feaeea92d90918625674b00658b83/9d67f671bcc6850586256e630059308b?...
Please read this information and then tell me something please.
Best regards!

Numeric control error handling

Hi all,
I have two question about numeric control.
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Let say, I have one numeric control that can only accept 0 to +inf (Range). So negative input will be invalid data input. Whenever I typed the negative value on it, this control automatically changed back to default (min) value. What I want is that. Is there anyway to detect invalid user input? So that I can program whenever user input negative number, it will automatically change back to previous valid input (not default value).
2) "How to assign the dynamic range of numeric control?"
I used property node to assign the range but my problem is that. I assigned min 0.1, max 1.2 and increment 0.1 but I cant able to select 1.2 or sometime 0.1 by using increment/decrement arrow. Maybe because of floating points? And also I want to do when user input overrange value (eg.1.3) by typing, the value should go back to previous valid input.
Any idea? Thanks

You can choose how LV will react on entries exceeding a limit. The default is, that LV coerces the value to the limit. But you can also ignore the limit and the user can enter any value.
Nevertheless, if you ignore the limits, you always have to check in your software for invalid values!
Regarding 2) i couldn't reproduce what you described. Maybe you should post a little example....
For the 2nd part of your question, please see my answer above...
hope this helps,
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How to get y axis value(in a numeric control) by providing x-axis value using wave graph

Hi,
I'm new here, Sorry if i have selected wrong Location.
I want to get Y-axis value (in a numeric Control) by providing X-axis Value using Wave graph.
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i have attached File and Snapshot.

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Drag and drop data from Numeric Control or Numeric Array to excel file

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There are very good drag and drop examples that ship with LabVIEW. Have you looked these over to see if they can be modified for your needs?
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hi, im new to this program and im trying to generate a range of number (ex. 5.0 1.0 0.25 and 0.10) using a numeric control. can anyone please shed some light? thanks.

It is not entirely clear what you really want, but you could just create an array control showing 4 elements. For that, you would first drop an array container on the front panel, the drop a suitable numeric control inside it. Now resize the container (horizontally or vertically) to show as many elements as you want.
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Message Edited by altenbach on 04-08-2007 07:50 AM
LabVIEW Champion . Do more with less code and in less time .
Attachments:
array.png ‏2 KB

How to change numeric control and indicator radix programmatically?

Hi All,
I need to know how can we change the radix of numeric control as well as numeric indicator while program is running.
Regards,
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Solved!
Go to Solution.

Right. Sorry Display Format -> Format
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Numeric Control Disable

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