I have 2 Entrys and one button. I want to make that button's state disabled until the two Entrys are filled in. How can I achieve that?
howManyStocksLabel = Label(root, text = "How many stocks do you want to evaluate?")
howManyStocksLabel.grid(row = 1, column = 0)
howManyStocksEntry = Entry(root, borderwidth = 3)
howManyStocksEntry.grid(row = 1, column = 1)
riskLabel = Label(root, text = "Enter risk %")
riskLabel.grid(row = 2, column = 0, sticky = 'w')
riskEntry = Entry(root, borderwidth = 3)
riskEntry.grid(row = 2, column = 1)
nextButton = Button(root, text = "Next!", width = 20, height = 2,state = DISABLED,
fg = 'green', bg = 'white',
command= lambda: myClick(riskEntry, howManyStocksEntry, var))
nextButton.grid(row = 4, column = 1)
I tried to check whether the entries are filled in or not by:
if(riskEntry.get() != ""):
....................
but it just doesn't work.
You need to check if the value is there after the user inputs it. Also, you can use tk.StringVar() as a text variable and trace it.
Here is an example:
import tkinter as tk
def check_entry(*args):
if r1.get() and r2.get():
b1.config(state='normal')
else:
b1.config(state='disabled')
root = tk.Tk()
r1 = tk.StringVar(master=root)
r2 = tk.StringVar(master=root)
e1 = tk.Entry(root, textvariable=r1)
e1.pack()
e2 = tk.Entry(root, textvariable=r2)
e2.pack()
b1 = tk.Button(root, text='Click Me!', state='disabled')
b1.pack()
r1.trace('w', check_entry)
r2.trace('w', check_entry)
root.mainloop()
You will need to use a binding on your entry widgets to check whether the user has entered anything into the entry or not.
This code will fire the check_entry function every time the user types in one of the entry boxes:
riskEntry.bind('<KeyRelease>', check_entry)
howManyStocksEntry.bind('<KeyRelease>', check_entry)
Then your check_entry function might look like this:
def check_entry(event): #event is required for all functions that use a binding
if riskEntry.get() and howManyStocksEntry.get():
nextButton.config(state=NORMAL)
else:
nextButton.config(state=DISABLED)
One way to do it would be to utilize the ability to "validate" their contents that Entry widgets support — see adding validation to an Entry widget — but make it check the contents of multiple Entry widgets and change the state of a Button accordingly.
Below shows how to do this via a helper class that encapsulates most of the messy details needed to make doing it relatively painless. Any number of Entry widgets can be "watched", so it scales well to handle forms consisting of many more than merely two entries.
from functools import partial
import tkinter as tk
from tkinter.constants import *
class ButtonEnabler:
""" Enable/disable a Button depending on whether all specified Entry widgets
are non-empty (i.e. contain at least one character).
"""
def __init__(self, button, *entries):
self.button = button
self.entries = entries
for entry in self.entries:
func = root.register(partial(self.check_entries, entry))
entry.config(validate="key", validatecommand=(func, '%P'))
def check_entries(self, this_entry, new_value):
other_entries = (entry for entry in self.entries if entry is not this_entry)
all_others_filled = all(entry.get() for entry in other_entries)
combined = bool(new_value) and all_others_filled
self.button.config(state=NORMAL if combined else DISABLED)
return True
root = tk.Tk()
howManyStocksLabel = tk.Label(root, text="How many stocks do you want to evaluate?")
howManyStocksLabel.grid(row=1, column=0)
howManyStocksEntry = tk.Entry(root, borderwidth=3)
howManyStocksEntry.grid(row=1, column=1)
riskLabel = tk.Label(root, text="Enter risk %")
riskLabel.grid(row=2, column=0, sticky='w')
riskEntry = tk.Entry(root, borderwidth=3)
riskEntry.grid(row=2, column=1)
nextButton = tk.Button(root, text="Next!", width=20, height=2, state=DISABLED,
fg='green', bg='white', disabledforeground='light grey',
command=lambda: myClick(riskEntry, howManyStocksEntry, var))
nextButton.grid(row=4, column=1)
enabler = ButtonEnabler(nextButton, howManyStocksEntry, riskEntry)
root.mainloop()
Related
I am trying to retrieve the selected value from a binded combobox.
In the below code, I have binded the combobox named “LSF_Combo” to another combobox “Queue _Combo” . I am trying to retrieve the selected value from the “Queue_Combo”, using Queue_Combo.get() method, but I am not able to do so, since its scope is limited within LSF_fields_Enable(event) inner function. I am able to retrieve the selected value of LSF_Combo using LSF_Combo.get() method.
Please let me know if anyone has suggestions for retrieving the selected value from the “Queue_Combo” combobox and furhter nested comboboxes "MT_Combo: and "Merge_Combo", so that I should be able to access and assign these to a variable outside the "LSF_Fields_Enable" function scope.
For example, If i had selected 'priority' from "Queue_Combo" and had selected "MT" from "MT_Combo", i should be able to assign these strings to variables outisde LSF_Fields_Enable(event) function. From the 'def run_program()' variable 'b' should have sting equals to 'priority' (since i have selected this) and variable 'c' should have string equals to 'MT'.
from tkinter import *
import tkinter as tk
from tkinter import ttk
root = Tk()
root.geometry("800x450")
def Gui_main():
Queue_Combo_list = ['normal', 'priority', 'devices', 'grid']
Queue_Combo = ttk.Combobox(root, values=Queue_Combo_list, width=10, state="readonly")
Merge_Combo_list = ['LST_SET_ML', 'LST_SET_EQU']
Merge_Combo = ttk.Combobox(root, values=Merge_Combo_list, width=12)
MT_Combo_list = ['MT', 'MTFLEX']
MT_Combo = ttk.Combobox(root, values=MT_Combo_list, width=10)
def LSF_Fields_Enable(event):
# global Queue_Combo, VCO_Combo, OS_Combo
VCO_1 = None
if LSF_Combo.get() == 'LSF':
# # section for Queue Type
Queue_Combo_label = tk.Label(root, text="Queue: ").grid(row=2, column=1, padx=5,sticky=W)
Queue_Combo.set("normal")
Queue_Combo.grid(row=2, column=1, padx=55, pady=5, sticky=W)
def MT_MT_flex(choice):
def Manage_run_mode(choice):
# if Merge_Combo.get() == 'LSF_SET_EQU' or 'LSF_SET_MAN':
if Merge_Combo.get() != 'LSF_SET_ML':
label = tk.Label(root, text="CPU No:").grid(row=4, column=3, padx=10,sticky=tk.W)
CPU_radio_button = tk.IntVar()
R1 = Radiobutton(root, text="2", variable=CPU_radio_button, value=1).place(x=50, y=520)
if MT_Combo.get() == 'MT':
# # section for choosing a file version
Merge_Combo_label = tk.Label(root, text="Merge: ").grid(row=6, column=2, padx=10,sticky=W)
Merge_Combo.set("LST_SET_ML")
Merge_Combo.grid(row=6, column=2, padx=65, pady=15, sticky=tk.E)
Merge_Combo.bind('<<ComboboxSelected>>',Manage_run_mode)
MT_Combo_label = tk.Label(root, text="MT/MTflex: ").grid(row=2, column=3, padx=10,sticky=W)
MT_Combo.set("MT")
MT_Combo.grid(row=2, column=4, padx=5, pady=5, sticky=tk.E)
MT_Combo.bind('<<ComboboxSelected>>',MT_MT_flex)
# LSF_Fields_Enable()
LSF_Combo_label = tk.Label(root, text="Fill: ").grid(row=2, column=0, sticky=W)
LSF_Combo_list = ['LSF', 'LOCAL']
LSF_Combo = ttk.Combobox(root, values=LSF_Combo_list, width=10, state="readonly", background='white')
LSF_Combo.set('LSF')
LSF_Combo.grid(row=2, column=0, padx=25, pady=5, sticky=W)
LSF_Combo.bind('<<ComboboxSelected>>', LSF_Fields_Enable)
Queue_Combo.bind('<<ComboboxSelected>>', lambda _: print(Queue_Combo.get()))
MT_Combo.bind('<<ComboboxSelected>>', lambda _: print(MT_Combo.get()))
Merge_Combo.bind('<<ComboboxSelected>>', lambda _: print(Merge_Combo.get()))
# a = LSF_Combo.bind("<Return", LSF_Fields_Enable)
def run_program():
a = LSF_Combo.get()
print(a)
b = Queue_Combo.get()
print(b)
c = MT_Combo.get()
d = Merge_Combo.get()
close = Button(root, text ='close', command= root.destroy).grid(row=10, column=2, pady=60, sticky=E)
check_combo_get =Button (root, text ='check_combo_get', command = run_program).grid(row=10, column=1, padx=15,pady=60, sticky=E)
root.mainloop()
if __name__ == "__main__":
Gui_main()
There is not an easy way to fix this problem in your setup.
But the solution is easy, if you just go ahead and restructure your code a little:
Define the combobox outside the LSF_Fields_Enable function and also asign its values at startup.
Queue_Combo_list = ['normal', 'priority', 'devices', 'grid']
Queue_Combo = ttk.Combobox(root, values=Queue_Combo_list, width=10, state="readonly")
Now bind the ComboboxSelected Event to whatever function you want to have (in this example a simple print).
Queue_Combo.bind('<<ComboboxSelected>>', lambda _: print(Queue_Combo.get()))
And there you go!
Now the print function is executed every time the selection changes for the queue-combobox.
Hope this helps :)
EDIT:
In the updated Code below I reformated your code to make it more readable and to achieve what you wanted to have.
The Value of the ComboBoxes are now assigned to variables ("Queue_Combo_variable", "LSF_Combo_variable").
You can access their values using:
Queue_Combo_variable.get()
I tried my best to comment the entire to be as understandable as possible. Let me now if this is how you imagined it to be!
NEW CODE:
from tkinter import ttk, Tk, Label, Button, StringVar
from tkinter.constants import W, E
def Gui_main():
# Create tkinter (window) instance
root = Tk()
root.geometry("300x250")
# Define LSF_Combox (Combobox)
LSF_Combo_variable = StringVar()
LSF_Combo_label = Label(root, text="Fill: ") # Label
LSF_Combo_label.grid(row=2, column=0, sticky=W)
LSF_Combo_list = ['LSF', 'LOCAL']
LSF_Combo = ttk.Combobox(root, values=LSF_Combo_list, textvariable=LSF_Combo_variable, width=10, state="readonly", background='white')
LSF_Combo.set('LSF')
LSF_Combo.grid(row=2, column=0, padx=25, pady=5, sticky=W) # and place it on the screen
# Define Queue_Combo (Combobox)
Queue_Combo_variable = StringVar()
Queue_Combo_label = Label(root, text="Queue: ") # Label
Queue_Combo_list = ['normal', 'priority', 'devices', 'grid']
Queue_Combo = ttk.Combobox(root, values=Queue_Combo_list, textvariable=Queue_Combo_variable, width=10, state="readonly")
# ==> The Queue_Combo_variable now always stores the value which is currently selected in the queue_combo (box)
#################################################################################################################################
#### ==> Through the following code the specfied function (LSF_Combo_changed) is always called, once the variable value changes #
#################################################################################################################################
LSF_Combo_variable.trace_add("write", lambda _0, _1, _2: LSF_Combo_changed())
Queue_Combo_variable.trace_add("write", lambda _0, _1, _2: print(Queue_Combo_variable.get()))
# If you don't understand, what all of this does, it doesn't matter just now, that you can change the print function to be the function you want to call instead!
# This function is now executed every time when the LSF_Combo (box) is changed (=> "Something has been selected in the left combobox")
def LSF_Combo_changed():
# If "LSF" has been selected, show the Queue_Combo Box
if LSF_Combo.get() == 'LSF':
Queue_Combo.set("normal")
Queue_Combo.grid(row=2, column=1, padx=55, pady=5, sticky=W)
Queue_Combo_label.grid(row=2, column=1, padx=10,sticky=W)
return Queue_Combo.get()
else: # If that hasn't been selected, "forget" the position of the Queue_Combo Box & Label ("Hide them")
Queue_Combo.grid_forget()
Queue_Combo_label.grid_forget()
return None
# Close Button
close_button = Button(root, text ='close', command= root.destroy)
close_button.grid(row=10, pady=60, sticky=E)
# Show window (tkinter instance)
root.mainloop()
if __name__ == "__main__":
Gui_main()
# Display Entry in a Label
from tkinter import *
root = Tk()
def returnEntry(arg=None):
"""Gets the result from Entry and return it to the Label"""
result = myEntry.get()
resultLabel.config(text=result)
# Create the Entry widget
myEntry = Entry(root, width=20)
myEntry.focus()
myEntry.bind("<Return>",returnEntry)
myEntry.pack()
# Create the Enter button
enterEntry = Button(root, text= "Enter", command=returnEntry)
enterEntry.pack(fill=X)
# Create and empty Label to put the result in
resultLabel = Label(root, text = "")
resultLabel.pack(fill=X)
root.geometry("+750+400")
root.mainloop()
How do I change the code to output more rows.
It changes the same row every time.
I tried to do something with fields but I had no idea what I was doing.
You are referencing the same object (resultLabel) over and over instead of creating a new one for each entry.
Try this:
from tkinter import *
root = Tk()
def returnEntry(arg=None):
"""Gets the result from Entry and return it to the Label"""
result = Label(root, width=20) # creating new label!!
result.pack()
result.config(text=myEntry.get())
# Create the Entry widget
myEntry = Entry(root, width=20)
myEntry.focus()
myEntry.bind("<Return>",returnEntry)
myEntry.pack()
# Create the Enter button
enterEntry = Button(root, text= "Enter", command=returnEntry)
enterEntry.pack(fill=X)
# Create and empty Label to put the result in
resultLabel = Label(root, text = "")
resultLabel.pack(fill=X)
root.geometry("+750+400")
root.mainloop()
I am trying to make my first GUI script based on the answers of 2 questions. I'll show an example of the non GUI script
while True:
ammount = input("What is your debt")
if ammount.isdigit() == True:
break
else:
print("Please try typing in a number")
while True:
month = input("In which month did the debt originate?")
if month not in ["January", "February"]:
print("Try again")
else:
break
The point of this script is that it is scalable with all the questions one may add, I want to understand it in the same way in Tkinter. I'll show what I've tried:
from tkinter import *
def click():
while True:
entered_text = text_entry.get()
if entered_text .isdigit() == False:
error = Label(window, text="Try again", bg = "black", fg="red", font="none 11").grid(row = 3, column = 2, sticky= W).pack()
else:
break
return True
window = Tk()
window.title("Tax calculator")
window.configure(background="black")
monto = Label(window, text="¿What is your debt?", bg="black", fg="white", font="none 12 bold")
monto.grid(row = 1, column = 0, sticky= W)
text_entry = Entry(window, width = 20, bg="white")
text_entry.grid(row = 2, column=2, sticky=W)
output = Button(window, text = "Enter", width = 6, command = click)
output.grid(row = 3, column = 0, sticky = W)
The thing is, I can't add a Label() method in the if/else of the click() method, because I would like to ask a new question once the condition is met. I can't also can't get True from click once the condition is met, because the input comes from Button() method. Thanks in advance
You don't actually need any loops here, a simple if statement would be enough to do the trick. Also, there is no need to recreate the label every time, you can just configure() its text. And, note that indexing starts from 0 - so, in your grid, actual first row (and column) needs to be numbered 0, not 1. Besides that, I suggest you get rid of import *, since you don't know what names that imports. It can replace names you imported earlier, and it makes it very difficult to see where names in your program are supposed to come from. You might want to read what PEP8 says about spaces around keyword arguments, as well:
import tkinter as tk
def click():
entered_text = text_entry.get()
if not entered_text.isdigit():
status_label.configure(text='Please try again')
text_entry.delete(0, tk.END)
else:
status_label.configure(text='Your tax is ' + entered_text)
text_entry.delete(0, tk.END)
root = tk.Tk()
root.title('Tax calculator')
root.configure(background='black')
monto = tk.Label(root, text='¿What is your debt?', bg='black', fg='white', font='none 12 bold')
monto.grid(row=0, column=0, padx=10, pady=(10,0))
text_entry = tk.Entry(root, width=20, bg='white')
text_entry.grid(row=1, column=0, pady=(10,0))
status_label = tk.Label(root, text='', bg='black', fg='red', font='none 11')
status_label.grid(row=2, column=0)
button = tk.Button(root, text='Enter', width=17, command=click)
button.grid(row=3, column=0, pady=(0,7))
root.mainloop()
I forgot to mention, if your application gets bigger, you might be better off using a class.
I am trying to make a GUI where as soon as the user inputs an integer into a ttk.entry field, that many checkbuttons need to appear below it. For example, if they put "5" into the entry widget, 5 check buttons need to appear below the entry field.
Edit:
What I ended up using:
self.number_of_stages = tk.IntVar()
self.check_box_dict={}
self.num_of_stages={}
self.stagetempvar={}
self.equipment_widgets={}
def centrifugal_compressor_widgets(self):
self.equipment_widgets.clear()
self.equipment_widgets["NumOfStagesLabelCentComp"]=tk.Label(self.parent, text="Number of Stages:", bg="white")
self.equipment_widgets["NumOfStagesLabelCentComp"].place(relx=0.5, y=260, anchor="center")
self.equipment_widgets["NumOfStagesEntryCentComp"]=ttk.Entry(self.parent, textvariable=self.number_of_stages)
self.equipment_widgets["NumOfStagesEntryCentComp"].place(relx=0.5, y=290, anchor="center")
def OnTraceCentComp(self, varname, elementname, mode):
for key in self.check_box_dict:
self.check_box_dict[key].destroy()
try:
if self.number_of_stages.get() <=15 :
i=1
self.stagetempvar.clear()
while i <= self.number_of_stages.get():
self.stagetempvar[i]=tk.StringVar()
self.stagetempvar[i].set("Closed")
self.check_box_dict[i]=ttk.Checkbutton(self.parent, text=i, offvalue="Closed", onvalue="Open",variable=self.stagetempvar[i])
self.check_box_dict[i].place(relx=(i*(1/(self.number_of_stages.get()+1))), y=360, anchor="center")
i+=1
except:
pass
take a look at the below and let me know what you think...
A very ugly, super basic example:
from Tkinter import *
root = Tk()
root.geometry('200x200')
root.grid_rowconfigure(0, weight = 1)
root.grid_columnconfigure(0, weight = 1)
win1 = Frame(root, bg= 'blue')
win1.grid(row=0, column=0, sticky='news')
number = IntVar()
entry = Entry(win1, textvariable = number)
entry.pack()
confirm = Button(win1, text = 'Press to create widgets...', command = lambda:create_widgets(number.get()))
confirm.pack()
def create_widgets(number):
for n in range(0,number):
Checkbutton(win1, text = 'Checkbutton number : %s' % n).pack()
root.mainloop()
This should be a very very simple problem. I'm making a GUI in which I have multiple entry widgets... about 30 or so all in one column. Instead of making each box one by one it seems like a better idea to just generate the widgets with a loop. However, I'm finding it extremely difficult to .get() values from the entry widgets, and convert them into floats. This is what I have so far... any help would be greatly appreciated.
class Application(Frame):
def __init__(root,master):
Frame.__init__(root,master)
root.grid()
root.create_widgets()
def calcCR(root):
d1 = root.enter.get()
d1 = float(d1)
#root.answer.delete(0.0,END)
a = 'The C/R Alpha is! %lf \n' % (d1)
root.answer.insert(0.0, a)
def create_widgets(root):
### Generate Element List ###
for i in range(len(elem)):
Label(root, text=elem[i]).grid(row=i+1, column=0)
### Generate entry boxes for element wt% ###
for i in range(len(elem)):
enter = Entry(root, width = 8)
enter.grid(row = i+1,column=1)
enter.insert(0,'0.00')
root.button = Button(root, text = 'Calculate C/R', command = root.calcCR)
root.button.grid(row=11, column=2, sticky = W, padx = 10)
root.answer = Text(root, width = 50, height = 12.5, wrap = WORD)
root.answer.grid(row=1, column=2, rowspan = 10, sticky = W, padx = 10)
root = Tk()
root.title('C/R Calculator')
app = Application(root)
root.mainloop()
Put the Entry instances into a list.
from tkinter import Tk, Frame, Label, Entry, Button
class App(Frame):
def __init__(root, master):
Frame.__init__(root, master)
root.grid()
root.create_widgets()
def get_values(root):
return [float(entry.get()) for entry in root.entries]
def calc_CR(root):
answer = sum(root.get_values()) #Replace with your own calculations
root.answer.config(text=str(answer))
def create_widgets(root):
root.entries = []
for i in range(20):
label = Label(root, text=str(i))
label.grid(row=i, column=0)
entry = Entry(root, width=8)
entry.grid(row=i, column=1)
entry.insert(0, '0.00')
root.entries.append(entry)
root.calc_button = Button(root, text='Calculate C/R', command=root.calc_CR)
root.calc_button.grid(row=20, column=0)
root.answer = Label(root, text='0')
root.answer.grid(row=20, column=1)
def run(root):
root.mainloop()
root = Tk()
root.title('C/R Calculator')
app = App(root)
app.run()