How can i mention my "ui-button" code in the function node when it is pressed?

Dashboard
1

Hello guys, i wanted to implement an "if "statement to execute the action once the button is pressed. By referring to my simple code below, other than using msg.payload or msg.topic , is there any other statement i can use to tell the program that the button has been pressed? I tried using " Button.isPressed()" , but it wouldnt work.. any suggestion?

if(Button.isPressed()=true)

msg.topic ="Yay"

else
{

msg.topic = " Not working"

}
return msg;

2

Pressing the button will start the flow, so setting the msg.topic to (for example) "buttonpressed" in the button node, and feeding that into a function node, you can then use;

if (msg.topic == "buttonpressed") {
do something
}

If you are then using an if/else statement, you will probably need to get those states from saved context first, to ensure that their values are available when the button is pressed.

3

Hi. Thanks for the heads up. The thing is i am using OPC UA to obtain the data and thus my "msg.payload" & "msg.topic" are both occupied with existing data value. And that is why im seeking for other alternative term as to not overwrite the data in the msg.payload and topic.

4 
if (msg.topic == "existingdata") {
do something
} else if (msg.topic == "buttonpressed") {
do something different 
}
5

I thought the message was coming from a ui-button.

6

Hi, sorry for the misunderstanding. The msg.topic contains "variable" values that is generated through the OPC-UA client node. And i would like it to display the data on the MySQL database only when i press the button on the dashboard.

The second image shows the code im trying to implement in the function node after the button node. This is what i meant by both the "msg.topic" and "msg.payload" are pre-occupied with values.

The third image is part of the configuration page of the ui-button node. there is only 2 term here that can be delivered upon button pressed. is there any other term that i can use other than these two?

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image

7

msg.topic happens to be a variable generated via the OPC UA-client node.

8

I would remove the button node from your flow, and use it to start a new 'stand alone' flow instead.
The new flow would run when you press the button and retrieve the latest data from your database.

So the new flow would comprise;
Button node - to run the flow
Function node - to format the query
Mariadb node - to retrieve the latest data

I don't use mariadb, so you'll have to do some searching to format the query.

9

hi Paul. Ive tried to create another flow(with button,function and debug node) mainly just to trigger the process in another flow. for button,Ive set the payload to be delivered to be a string('yes') when button is pressed.

Image 1 & 2 is the flow and the code respectively. this button on the dashboard, when pressed, it should trigger the process in other flow(shown in image 3 & 4).

The issue here is, i couldnt get the variable reading(image 3) that i have initialised in my other flow(image 1).

Im guessing there is some issue with my code.

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image

image

image

10

Is this a different question to what you initially asked?
I thought that you wanted to push a button, which would retrieve the last value saved to Maria.db?

I'm now confused what exactly that you are trying to achieve.

11

Looks like Jack has opened a second thread with the same question

@JackJackTan414 Please done post the same question more than once, it wastes people's time.

12

A post was merged into an existing topic: How to deliver variable value to different flow when ui-button is pressed

13

Topic closed because OP has duplicate post...