CODEWITHSUNDEEP
pythonclassevent-handlingtkinter
Brandon
Brandon

Reputation: 361

Trouble with Tkinter event handler inside of a class

My problem is that I have a class that creates a Tkinter topclass object and then puts a field into it and I want to add an event handler that runs a method (that is also in the class) every time a button is pressed but when the event is called it says

AttributeError: Toplevel instance has no attribute 'updateSearch'

class EditStudentWindow():

def __init__(self):

    searchResultList = ['student1', 'student2', 'student3'] # test list

    ##### window attributes

    # create window
    self = Tkinter.Toplevel()

    #window title
    self.title('Edit Students')

    ##### puts stuff into the window

    # text
    editStudentInfoLabel = Tkinter.Label(self,text='Select the student from the list below or search for one in the search box provided')
    editStudentInfoLabel.grid(row=0, column=0)

    # entry box
    searchRepositoryEntry = Tkinter.Entry(self)
    searchRepositoryEntry.grid(row=1, column=0)

    # list box
    searchResults = Tkinter.Listbox(self)
    searchResults.grid(row=2, column=0)

    ##### event handler

right here 

    searchRepositoryEntry.bind('<Key>',command = self.updateSearch)
    # search results

    for result in searchResultList:
        searchResults.insert(Tkinter.END, result)

def updateSearch(self, event):
    print('foo')

Upvotes: 0

Views: 1109

Answers (1)

Bryan Oakley
Bryan Oakley

Reputation: 385800

Judging solely on the indentation of your example, it appears that updateSearch is indeed not part of the class definition.

Assuming the indentation is a markup mistake, and based on the error message you report, the other problem is that you redefine self, so 'self.updateSearch' points to the toplevel rather than the EditStudentWindow class. Note that the message says Toplevel instance has no attribute 'updateSearch' rather than EditStudentWindow instance...

Typically, such widgets are created with inheritance rather than composition. You might want to consider refactoring your code to look something like:

class EditStudentWindowClass(Tkinter.Toplevel):
    def __init__(self, *args, **kwargs):
        Tkinter.Toplevel.__init__(self, *args, **kwargs)
        self.title('Edit Students')
        ...

Upvotes: 1

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