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You cannot pass value by to the Controller method which is expecting parameter with the use of CommandButton action or using any ActionFunctions. A setter method that assigns the value of this param to a variable in the associated Visualforce controller.
How to pass a parameter from a page to a controller?
If I’m understanding correctly what you are trying to accomplish; You don’t need to pass it from the page to the controller. You can access url parameters in the controller. You can then use the oppID to attach to the page you will be redirecting the user to.
How to pass the parameter from the VF page?
I have the VF Page and through a custom button I am passing the parameter To the VF URL as https://abc–c.cs41.visual.force.com/apex/Send_Env_Email?OppId=00655D0Z8 I want to retrieve this within the same page so I can pass it in the command button so call the other controller method
How to pass parameters to a Visualforce controller?
A setter method that assigns the value of this param to a variable in the associated Visualforce controller. If this attribute is used, getter and setter methods, or a property with get and set values, must be defined. If you really want to pass parameters to a controller method then use RemoteAction (Javascript remoting)
How to pass arguments to Tkinter button command?
Tkinter provides a powerful object-oriented interface to the Tk GUI toolkit. Import tkinter package. Create a root window. Give the root window a title (using title ()) and dimension (using geometry ()). Create a button using (Button ()). Use mainloop () to call the endless loop of the window.
You simply wrap the function you want to use in another function and call the second function on the button press. Lambdas are all well and good, but you can also try this (which works in a for loop btw): This works because when the binding is set, a key press passes the event as an argument.