[英]Tkinter Combobox dynamically set values
I'm attempting to set the options of a Tkinter Combobox dynamically.我正在尝试动态设置 Tkinter Combobox 的选项。 My code almost works, and I'm not sure why.
我的代码几乎可以工作,我不确定为什么。
The code is designed to allow typing a string into an Entry box.该代码旨在允许在输入框中键入字符串。 It then searches through a list for any items that contain that string.
然后在列表中搜索包含该字符串的任何项目。 So for example, if you type
例如,如果您键入
Mi
米
into the entry box the list becomes进入输入框,列表变为
['Mickey', 'Minnie']
['米奇','米妮']
All this works as expected.所有这些都按预期工作。
The Combobox [values]
attribute is supposed to update whenever <FocusIn>
is triggered using a function. Combobox
[values]
属性应该在使用函数触发<FocusIn>
时更新。 This does indeed happen, but only after I click on the Combobox twice.这确实发生了,但只有在我单击组合框两次之后。 I'm not sure why clicking on it the first time doesn't trigger the
<FocusIn>
binding.我不确定为什么第一次点击它不会触发
<FocusIn>
绑定。 Is this the wrong binding?这是错误的绑定吗? Is there something about my lambda function that isn't quite right?
我的 lambda 函数有什么地方不太正确吗? Would love some help!
希望得到一些帮助!
Code:代码:
from tkinter import *
from tkinter import ttk
init_list = ['Mickey', 'Minnie', 'Donald', 'Pluto', 'Goofy']
def db_values():
i = inp_var.get()
db_list = [x for x in init_list if i in x]
print(db_list)
return db_list
def db_refresh(event):
db['values'] = db_values()
root = Tk()
title_label = Label(root, text="Partial string example")
title_label.grid(column=0, row=0)
inp_var = StringVar()
input_box = Entry(root, textvariable=inp_var)
input_box.grid(column=0, row=1)
name_selected = StringVar()
db = ttk.Combobox(root, textvariable=name_selected)
db['values'] = db_values()
db.bind('<FocusIn>', lambda event: db_refresh(event))
db.grid(column=0, row=2, sticky=EW, columnspan=3, padx=5, pady=2)
root.mainloop()
def db_values():
i = inp_var.get()
db_list = [x for x in init_list if i in x]
print(db_list)
db['values'] = db_values()
Only this small Change is requires.只有这个小改动是需要的。 list value must be assigned in the function itself.
必须在函数本身中分配列表值。
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