如何將按鈕點擊分配到tkinter上的變量

Question

我想創建一個tkinter窗口，在該窗口中將文件夾的文件顯示爲下拉菜單和Select按鈕，這樣當我從上一個選擇元素列出完整的路徑將被保存到一個新的變量中。顯然，我需要給出一個適當的命令。

from Tkinter import * 
import tkFileDialog 
import ttk 
import os 




indir= '/Users/username/results' 


root = Tk() 

b = ttk.Combobox(master=root, values=os.listdir(indir)) # This will create a dropdown menu with all the elements in the indir folder. 
b.pack() 
w = Button(master=root, text='Select', command= ?) 
w.pack() 

root.mainloop() 

Answer 1

嘗試是這樣的：

w = Button(master=root, text='Select', command=do_something) 

def do_something(): 
    #do something 

在功能do_something你創建你需要得到完整路徑是什麼。你也可以將變量傳遞給命令。

Answer 2

我想你在這裏需要的實際上是一個綁定。按鈕不需要。

下面是一個將列出所選目錄中的所有內容的示例，然後當您在組合框中單擊它時，它將打印出其選擇。

更新，添加目錄和文件名稱合併以獲得新的完整路徑：

from Tkinter import * 
import tkFileDialog 
import ttk 
import os 


indir= '/Users/username/results' 
new_full_path = "" 

root = Tk() 

# we use StringVar() to track the currently selected string in the combobox 
current_selected_filepath = StringVar() 
b = ttk.Combobox(master=root, values=current_selected_filepath) 

function used to read the current StringVar of b 
def update_file_path(event=None): 
    global b, new_full_path 
    # combining the directory path with the file name to get full path. 
    # keep in mind if you are going to be changing directories then 
    # you need to use one of FileDialogs methods to update your directory 
    new_full_path = "{}{}".format(indir, b.get()) 
    print(new_full_path) 

# here we set all the values of the combobox with names of the files in the dir of choice 
b['values'] = os.listdir(indir) 
# we now bind the Cobobox Select event to call our print function that reads to StringVar 
b.bind("<<ComboboxSelected>>", update_file_path) 
b.pack() 
# we can also use a button to call the same function to print the StringVar 
Button(root, text="Print selected", command=update_file_path).pack() 

root.mainloop() 

Answer 3

的get（） 返回組合框的當前值（https://docs.python.org/3.2/library/tkinter.ttk.html）

from Tkinter import * 
import tkFileDialog 
import ttk 
import os 


indir= '/Users/username/results' 

#This function will be invoked with selected combobox value when click on the button 
def func_(data_selected_from_combo): 
    full_path = "{}/{}".format(indir, data_selected_from_combo) 
    print full_path 
    # Use this full path to do further 



root = Tk() 

b = ttk.Combobox(master=root, values=os.listdir(indir)) # This will create a dropdown menu with all the elements in the indir folder. 
b.pack() 


w = Button(master=root, text='Select', command=lambda: func_(b.get())) 
w.pack() 

root.mainloop()