Using a control of the chain with the Enter key, return * and * allowing repeated identical entry

Hi all

There must be a simple solution for this, but it's Friday afternoon, and my brain is not cooperating.

I create a simple terminal through which a user can interact with an instrument. My question is about the only query string control. The button send and the Terminal Table are here for reference.

Here is my desired behavior:

(a) the user types a command in the field of the query, tape input or return. An event is triggered, and the request is sent to the instrument. The focus remains on the field in the query.

(b) with any other action the interface user, the user types Enter or return again and again, by triggering an event that sends the request to the instrument every time Enter or return is typed. The focus remains on the field in the query.

Here's what I have:

This allows for one), but fails to b). The reason is, because the value of the field in the query has not changed, change value event does not fire when the user starts to spam keys enter or return. There is a way around this, as suggested by this post. Here is the solution in a few words:

Instead of looking for the change in the value of the query command, the event fires for each key event to the bottom of the control and resembles a pressure of enter key or return. What attracts the user action, even if the content of the field of the request have not changed. The problem with this approach is that, when this event fires, I need to read the value of the query string order and send it to the instrument, but the value I get via the local Variable query is the old value, probably because the key down event fires before the value of query is saved as changed. Is there a way to programatically "enter" the contents of the control channel so it is recorded as a change in value, until I have the question via a local Variable? Is there a different way I should go about it? I'd rather not do anything that bound the input keys or return to this particular area, since I have many other UI elements that need these keys in my program.

If not, is there a way to make the control of the fire 'Change of value' query string event when the user presses enter or return even if the value has not changed?

Thank you for your comments!

I thought about it.

(1) control of the string (query) a value of update while typing.

(2) save the key event down to the control of the chain. If the entry or return was pressed, send the state machine to the State 'send request '.

(3) in the application 'send' State read control channel via the local Variable value.

This is the desired behavior to allow the user repeatedly hit entry or return to regularly send a command, and the user can also type in a new order and send it by pressing enter or return.

Thanks to all who have helped me this something to think about!

Tags: NI Software

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