How to handle events in multiple windows?

[OndoyManing]

Let's say I have a window that has a button which will open a second window that contains a several Input() and a button that will act as submit. How do I handle the event of the button in the second window? I tried putting it on the same event loop like the rest but when I click on the button it does nothing.

EDIT
Terribly sorry for the title changes, I'm afraid I could not phrase it properly. I hope you still understand what I'm trying to say.

[zappfinger]

You have to use the event loop of the second window for that. Op di 18 dec. 2018 om 14:42 schreef OndoyManing <notifications@github.com>:

…

Let's say I have a window that has a button which will open a second window that contains a several Input() and a button that will act as submit. How do I handle the event of the button in the second window? I tried putting it on the same event loop like the rest but when I click on the button it does nothing. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#946>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AFkYZ4vy1OHc0-4ak3E5nxOtyHQSjGx8ks5u6PC9gaJpZM4ZYUyf> .

[OndoyManing]

You have to use the event loop of the second window for that. Op di 18 dec. 2018 om 14:42 schreef OndoyManing notifications@github.com:
…
Let's say I have a window that has a button which will open a second window that contains a several Input() and a button that will act as submit. How do I handle the event of the button in the second window? I tried putting it on the same event loop like the rest but when I click on the button it does nothing. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#946>, or mute the thread https://github.com/notifications/unsubscribe-auth/AFkYZ4vy1OHc0-4ak3E5nxOtyHQSjGx8ks5u6PC9gaJpZM4ZYUyf .

Thanks for the reply! I'm sorry but I'm fairly new to this, how do I specify an event loop for the second window?

[zappfinger]

After you create the second window, use another while loop like this:

# code to create second window
while True:
	event2, values2 = window2.Read(timeout=20)
	if event2 is not None:
            etc..

[MikeTheWatchGuy]

There are demo programs that show how to run 2 windows.

https://github.com/MikeTheWatchGuy/PySimpleGUI/blob/master/DemoPrograms/Demo_Design_Pattern_Multiple_Windows.py

https://github.com/MikeTheWatchGuy/PySimpleGUI/blob/master/DemoPrograms/Demo_Design_Pattern_Multiple_Windows2.py

https://github.com/MikeTheWatchGuy/PySimpleGUI/blob/master/DemoPrograms/Demo_Design_Pattern_Multiple_Windows1.py

There are others as well, but these are the most basic.

[OndoyManing]

After you create the second window, use another while loop like this:

# code to create second window
while True:
	event2, values2 = window2.Read(timeout=20)
	if event2 is not None:
            etc..

Thanks @zappfinger ! It's now working, here's my code snippet.
```
elif event == 'Override':
while True:
event, values = window2.Read(timeout=0)
if event == 'Submit':
userid = values['user2']
passwrd = values['passwrd']
sg.Popup(userid, passwrd) #just to show that the inputs are saved to the variable.

[OndoyManing]

There are demo programs that show how to run 2 windows.

https://github.com/MikeTheWatchGuy/PySimpleGUI/blob/master/DemoPrograms/Demo_Design_Pattern_Multiple_Windows.py

https://github.com/MikeTheWatchGuy/PySimpleGUI/blob/master/DemoPrograms/Demo_Design_Pattern_Multiple_Windows2.py

https://github.com/MikeTheWatchGuy/PySimpleGUI/blob/master/DemoPrograms/Demo_Design_Pattern_Multiple_Windows1.py

There are others as well, but these are the most basic.

Got the multiple windows working thanks to the demos! Unfortunately the demos don't show how the events are handled on each window, but it's all good now! Thank you so much!

[MikeTheWatchGuy]

Unfortunately the demos don't show how the events are handled on each window

The demos do show how to handle events. The arrangement of the event loops depends on the interaction between the windows.

In some cases, one window pops up and the first window become inactive. Another is both windows stay active. The demos show the event loops for these situations. You will add your code to handle your events inside of those event loops.

For a "clue" as to where you find each of those event loops, look for an statement like:

if event is None:
    break

This is where you will add your code to check for buttons, read values from your window, etc.

The design patterns have all the code you'll need to run multiple windows. If you need more examples, they are in the demo programs section of this github. Have you looked at the documentation too?

[OndoyManing]

Unfortunately the demos don't show how the events are handled on each window

The demos do show how to handle events. The arrangement of the event loops depends on the interaction between the windows.

In some cases, one window pops up and the first window become inactive. Another is both windows stay active. The demos show the event loops for these situations. You will add your code to handle your events inside of those event loops.

For a "clue" as to where you find each of those event loops, look for an statement like:

if event is None:
    break

This is where you will add your code to check for buttons, read values from your window, etc.

The design patterns have all the code you'll need to run multiple windows. If you need more examples, they are in the demo programs section of this github. Have you looked at the documentation too?

I am deeply sorry, I can't believe I missed the first demo for multiple windows! That was basically what I was asking for. I changed my code now and it's similar to the first pattern. Thank you so much and sorry for the trouble. Though I have a side question for this matter, the second window is supposed to be the authentication window and will open up a third window if the credentials are correct. How are validations done with PySimpleGUI? Validations such as field must not be left blank, etc. Should I open another issue for this matter?

[MikeTheWatchGuy]

"Validations" are your responsibility.

When you "Read" a window, you get back a dictionary of all the values. You can test any of the values you want to determine if they are valid or not.

You can use a "Popup" window for simple messages. The design patterns show the multiple windows using Popups as well.

I urge you to read the documentation to get an idea of how this SDK works. http://www.PySimpleGUI.org

[OndoyManing]

I definitely need to read more!
Here's how I handled the blank inputs, would love to hear your opinion on this. Thank you!

            if event == 'Submit':
                    userid = values['user2']
                    passwrd = values['passwrd']
                    if userid and passwrd != "":
                        sg.Popup('Succes!', userid, passwrd)#just to simulate a correct input.
                    elif userid  == "":
                        sg.Popup('User ID field is required')
                    elif passwrd == "":
                        sg.Popup('Password field is required')

[MikeTheWatchGuy]

There you go! Exactly the kind of thing to do in order to validate fields.

You can also do it "realtime" but that's more complex than you need. You would do something like that for input fields that take only numbers for example.

You've got the right idea.

Try it out, see how it works.

If you are concerned about people interacting with the windows while the Popups are showing, you can hide the window before you show the popup.

You likely want to change:
if userid and passwrd != "":

to

if '' in(userid,passwrd):

so that both userid and passwrd are checked for ''.