Popup Window in Workflow

Hey Guys,

i got a rule engine component where i have to put in a date which i getting written into the output data table.
Is there a way, when i execute the workflow, that a popup window shows up and i enter the date in the popup window field and it gets written in the rule engine component, so i dont have to open the component separately and then execute the workflow.
Its basically a easier way for my colleagues to start the workflow without knowing where they have to update the date for the output file.

Thanks and kind regards

Hi @Aco_Krivo. Sure, you can use the ndoe:

1 Like

Hi there,

another purist solution from my side, as I never clicked with these mega-fiddly “Widget” nodes (KNIME definitely deserves a :trophy: for the most complicated and stressful “Close” button I’ve ever seen!).

What I usually do when a workflow requires direct interaction: Put a Java Snippet node which opens a javax.swing.JOptionPane:

out_password = JOptionPane.showInputDialog(null, "Enter password");

Execute the node, the dialog will pop up, enter the data, and execution will continue.

When you use a Java Edit Variable node, make sure to check Run only on execution on the options.

Hope this helps!



Thanks for the quick replies guys!
Ive tried it with the Java Snippet but cant get it to work :frowning:

I’ve copied your code into the expression_start field and i’ve changed the column name
and added an output field.
I alwas get the following error messag:
Error in line 29: JOptionPane cannot be resolved.
Is there a way to fix this without annoying you too much :sweat_smile:

Let’s try :stuck_out_tongue:

Sorry, I forgot that you’ll need to add the following import (at the very top):

import javax.swing.JOptionPane;

Alternatively, if you want a one liner without explicit import, you can just do:

out_password = javax.swing.JOptionPane.showInputDialog(null, "Enter password");

Note, that out_password must be declared in the “Output” section at the end of the configuration.

Let me know if you’re still having trouble and I can upload an example workflow!



Update: Here’s an example workflow:


Thxxx Phillip it works great ur a legend!!

Is there also the possibility that the input is inserted in all lines? Or do i always have
to type the date for every line?

@Aco_Krivo Happy to hear, thanks for the feedback :slight_smile:

Is there also the possibility that the input is inserted in all lines? Or do i always have
to type the date for every line?

Sure – here’s two ideas how to do it:

  • Use the second variant in the example workflow which works via flow variables as a foundation. Use a Variable to Table Column node to append the value from the flow variable to the table.

  • When you use the first example, modify the code in the Java Snippet node as follows:

    // Your custom variables:
    String text;
    // -----------------------------
    // Enter your code here:
    if (text == null) {
       text = javax.swing.JOptionPane.showInputDialog(null, "Hello human, what’s your name?");
    out_name = text;

Hope this helps! :slight_smile:


PS: I have updated the workflow on my NodePit space with two examples for what I described above.


Thank you so much Phillip it works great.
I’ve already shown it to my colleagues and they love it.

Have a nice weekend!


This topic was automatically closed 7 days after the last reply. New replies are no longer allowed.