How do I bind the enter key to a function in tkinter

Question

I am a Python beginning self-learner  running on MacOS  I m making a program with a text parser GUI in tkinter  where you type a command in a Entry widget  and hit a Button widget  which triggers my parse   funct  ect  printing the results to a Text widget  text-adventure style    gt  Circumvent the button I can t let you do that  Dave   I m trying to find a way to get rid of the need to haul the mouse over to the Button every time the user issues a command  but this turned out harder than I thought  I m guessing the correct code looks like self bind   lt Return gt    self parse     But I don t even know where to put it  root    init    parse    and create widgets   don t want it  To be clear  the only reason anyone should hit enter in the prog is to trigger parse    so it doesn t need to be espoused to the Entry widget specifically  Anywhere it works is fine  In response to 7stud  the basic format  from tkinter import   import tkinter font  random  re  class Application Frame            def   init   self  master           Frame   init   self  master               self grid           self create widgets           self start                 def parse self                     def create widgets self                                 self submit   Button self  text   quot Submit Command  quot   command  self parse               self submit grid                root   Tk   root bind   lt Return gt    self parse   app   Application root   root mainloop

User · Answer

I found one good thing about using bind is that you get to know the trigger event: something like: "You clicked with event = [ButtonPress event state=Mod1 num=1 x=43 y=20]" due to the code below:

self.submit.bind('<Button-1>', self.parse)
def parse(self, trigger_event):
        print("You clicked with event = {}".format(trigger_event))

Comparing the following two ways of coding a button click:

btn = Button(root, text="Click me to submit", command=(lambda: reply(ent.get())))
btn = Button(root, text="Click me to submit")
btn.bind('<Button-1>', (lambda event: reply(ent.get(), e=event)))
def reply(name, e = None):
    messagebox.showinfo(title="Reply", message = "Hello {0}!\nevent = {1}".format(name, e))

The first one is using the command function which doesn't take an argument, so no event pass-in is possible. The second one is a bind function which can take an event pass-in and print something like "Hello Charles! event = [ButtonPress event state=Mod1 num=1 x=68 y=12]"

We can left click, middle click or right click a mouse which corresponds to the event number of 1, 2 and 3, respectively. Code:

btn = Button(root, text="Click me to submit")
buttonClicks = ["<Button-1>", "<Button-2>", "<Button-3>"]
for bc in buttonClicks:
    btn.bind(bc, lambda e : print("Button clicked with event = {}".format(e.num)))

Output:

Button clicked with event = 1
Button clicked with event = 2
Button clicked with event = 3

User · Answer

Another alternative is to use a lambda   ent bind   lt Return gt     lambda event  name of function       Full code   from tkinter import   from tkinter messagebox import showinfo  def reply name       showinfo title  Reply   message    Hello  s     name    top   Tk   top title  Echo   top iconbitmap  Iconshock-Folder-Gallery ico    Label top  text  Enter your name    pack side TOP  ent   Entry top  ent bind   lt Return gt     lambda event  reply ent get      ent pack side TOP  btn   Button top text  Submit   command  lambda  reply ent get      btn pack side LEFT   top mainloop     As you can see  creating a lambda function with an unused variable  event  solves the problem

User · Answer

Try running the following program   You just have to be sure your window has the focus when you hit Return--to ensure that it does  first click the button a couple of times until you see some output  then without clicking anywhere else hit Return   import tkinter as tk  root   tk Tk   root geometry  300x200    def func event       print  You hit return    root bind   lt Return gt    func   def onclick        print  You clicked the button    button   tk Button root  text  click me   command onclick  button pack    root mainloop     Then you just have tweak things a little when making both the button click and hitting Return call the same function--because the command function needs to be a function that takes no arguments  whereas the bind function needs to be a function that takes one argument the event object    import tkinter as tk  root   tk Tk   root geometry  300x200    def func event       print  You hit return     def onclick event None       print  You clicked the button    root bind   lt Return gt    onclick   button   tk Button root  text  click me   command onclick  button pack    root mainloop     Or  you can just forgo using the button s command argument and instead use bind   to attach the onclick function to the button  which means the function needs to take one argument--just like with Return   import tkinter as tk  root   tk Tk   root geometry  300x200    def func event       print  You hit return     def onclick event       print  You clicked the button    root bind   lt Return gt    onclick   button   tk Button root  text  click me   button bind   lt Button-1 gt    onclick  button pack    root mainloop     Here it is in a class setting   import tkinter as tk  class Application tk Frame       def   init   self           self root   tk Tk           self root geometry  300x200            tk Frame   init   self  self root          self create widgets        def create widgets self           self root bind   lt Return gt    self parse          self grid            self submit   tk Button self  text  Submit           self submit bind   lt Button-1 gt    self parse          self submit grid        def parse self  event           print  You clicked         def start self           self root mainloop     Application   start

[python] How do I bind the enter key to a function in tkinter?

Examples related to python

Examples related to python-3.x

Examples related to tkinter

Examples related to key-bindings