Run function after combo box value change in ETO Form

Scripting
1

Hi,

How does one run a function immediately following a user selection in a combo box? (Click Event or Update Event?)

Eric

2

Hi @eric.bunn,

Did you make a handler for DropDown.SelectedIndexChanged?

– Dale

3

I did not. Do you have a example code snippet?

Eric

4

Is this anything like Windows Form Code? Can I model the functions in this manner.

Eric

5

See the following sample:

– Dale

1 Like
6

Thanks. I’ll check it out.

Eric

7

Thank you Dale. I see you handle this like a Windows form with similar syntax. Really appreciate the help!!!

8

Follow up question to the last:

In the event handler function, based on a user selection how would one go about changing the text on a form label? What would the syntax be?

Thanks Eric

9

Hi @eric.bunn,

I’ve updated the sample (above) to include a label.

– Dale

10

Dale,

Thank you again!!! This is perfect.

Eric

11

Dale,

Is there a way to set up a single handler function with a variable that will tell you which control was accessed? The sender only tells you what type of control was clicked and not which control was clicked. I want to set up single handler function and I need to know which control was accessed.

Here’s the function I am trying to set up. I need to know which control was activated as well as the type? Is this possible?

def OnSelectedIndexChanged(self, sender, e):
    type = str(sender)
    if type == "Eto.Forms.Label":
        print('Label Changed')
    if type == "Eto.Forms.TextBox":
        print('TextBox Changed')    
    elif type == "Eto.Forms.CheckBox":
        print('CheckBox Changed') 
    elif type == "Eto.Forms.ComboBox":
        print('ComboBox Changed') 
    elif type == "Eto.Forms.DropDown":
        print('Drop Down Changed')

Eric

12

Why do you want to do this, as not all controls have the same events? For example, a label doesn’t have a selected index changed event.

– Dale

13

I’ll give the function a more generic name. I want to use it to change labels and the like based on choices made or information entered. The if elif statements will take care of the work once I know which control made the call and the value of the control. I did get a suggestion from someone else that I could assign an ID to a control and then pull that information once I’m in the function.

I’m just trying to minimize the number of functions is all.

Eric

14

Dale

To expand a little further I am creating a user form class that will allow me to pass in a list which will in turn create the userform without having to build the code each time I want a new form. For example: I’ll pass in [‘TextBox’,’txtb_1’,None] which will tell the class to construct a textbox with the name txtb_1 with value of None. I’ve got a basic class started and working. Working now on retrieving the information.

15

In one of my sections I use the Tag property to handle them all in one handler:

I think you can use that Tag property to keep track of your components and do with them what you please.

16

Where do you access the tag property? This is a control property?

17

as far as I remember every label, radio button, button, etc in WinForms also has the Tag property

18

Ivelin,

I do see this now. Another user told me to use the ID property which seems to work as well. I suppose for my purposes both will work.

Thanks for letting me know,

Eric

1 Like