Is there a way to only allow a user to check one Checkbutton widget at a time out of a set of Checkbutton widgets? I can imagine some brute-force solutions, but I'm looking for something elegant.
You can tie all the checkbutton to single variable with different onvalue.
import tkinter
root = tk.Tk() #Creating the root window
var = tk.IntVar() #Creating a variable which will track the selected checkbutton
cb = [] #Empty list which is going to hold all the checkbutton
for i in range(5):
cb.append(tk.Checkbutton(root, onvalue = i, variable = var))
#Creating and adding checkbutton to list
cb[i].pack() #packing the checkbutton
root.mainloop() #running the main loop
I have created them in a loop for demonstration purpose. Even when you create them sequentially you can use the same variable name with different onvalue.
Related
I have a for loop that creates multiple rows and columns of labels and entries from a Treeview selection and sets the entries to current Treeview values.
import tkinter as tk
from tkinter import ttk
allitems = {}
keys = ['UID', 'Col5', ...]
entries = []
selections = trv.selection()
uid = ",".join([str(trv.item(i)['values'][0])
for i in selections])
col5 = ",".join([str(trv.item(i)['values'][5])
for i in selections])
for i in range(0, len(selections)):
l1 = ttk.Label(top, text="UID:")
l1.grid(row=i, column=0, sticky=tk.W)
uidentry = ttk.Entry(top)
uidentry.grid(row=i, column=1)
uidentry.insert(0, uid.split(",")[i])
l2 = ttk.Label(top, text="Col5:")
l2.grid(row=i, column=2, sticky=tk.W)
col5entry = ttk.Entry(top)
col5entry.grid(row=i, column=3)
col5entry.insert(0, col5.split(",")[i])
...
...
get_butt = tk.Button(top, text="Get All")
get_butt.grid(column=6)
There are 7 labels and 7 entry widgets created in this loop. I'm trying to get the values of the entries stored in a dictionary or list temporarily for me to use the get method to create an update function for a button. I've tried some examples I've seen from other posts like
entries.append(uidentry)
entries.append(col5entry)
and doing
for i, j in zip(keys, entries):
allitems.update({i: j})
and adding a function for a button like this
def get_all():
for keys, v in allitems.items():
items = keys, v.get()
print(items)
but it only prints the first set of Keys and entry values.
What I'm wanting to achieve is to have all the uidentry values attach to ['UID'] in order and col5entry values attach to ['Col5'] maybe something kinda like this
{'UID':['E001', 'E002', 'E003', .....]
'Col5':['Stuff1', 'Stuff2', 'Stuff3', .....]}
I'm new to python and really struggling with the logic of how to achieve this properly. Here is a Pastebin of my working code with Treeview set up so you can copy test/ see what I'm working with.
https://pastebin.com/n0DLQ5pY
EDIT: If you test the snippet of the app the event to trigger show_popup is hitting the ENTER key after making selections on Treeview.
I have a window in Tkinter that looks like this:
When i click on a button in the first row, it stays. However, when i click on a button in the second row, it unselects the one i chose above.
I want it to be able to only select one option per row. Is there something I'm missing? When it's done, I want to be able to iterate over the rows and get the value of the boxes, but I'm not sure how to do that either.
The code for that section is:
for i in studentList:
Label(left,text=i[0][::]+' ' + i[1][::],fg='black',bg='#dbdbdb',font=('Arial',11,'bold')).grid(row=counter,column=0,pady=13,sticky='news')
P = Radiobutton(right,text='Present',bg='#56ab32',fg='black',value='P'+str(counter),indicatoron = 0,font=('Arial',12,'bold'))
P.grid(row=counter,column=0,pady=10,padx=20,sticky='news')
L = Radiobutton(right,text='Leave',bg='#e6a800',fg='white',indicatoron = 0,value='L'+str(counter),font=('Arial',12,'bold'))
L.grid(row=counter,column=1,pady=10,padx=20,sticky='news')
Radiobutton(right,text='Absent',bg='#bd2900',fg='white',indicatoron = 0,value='A'+str(counter),font=('Arial',12,'bold')).grid(row=counter,column=2,pady=10,padx=20,sticky='news')
counter+=1
Radiobuttons work by assigning two or more radiobuttons the same instance of one of tkinter's special variable objects -- usuallyStringVar or IntVar. This sharing of a variable is what makes a group of radiobuttons work as a set, since the variable can only hold a single value.
Because you aren't assigning a variable, tkinter is using a default variable which is the same for every button. Thus, all buttons are acting as a single set.
To make your code work, each row needs to use it's own instance of StringVar. It would look something like this:
vars = []
for i in studentList:
var = StringVar()
vars.append(var)
...
Radiobutton(right, variable=var, ...)
Radiobutton(right, variable=var, ...)
Radiobutton(right, variable=var, ...)
...
With the above, you can get the choice of each row by getting the value of the variable for that row. For example, the first row would be vars[0].get(), the second row would be vars[1].get() and so on.
In a recipe book about Python/tkinter, I found this snippet on how to create three Radiobutton widgets within one loop:
colors = ["Blue", "Gold", "Red"]
radVar = tk.IntVar()
radVar.set(99)
for col in range(3):
curRad = 'rad' + str(col)
curRad = tk.Radiobutton(win, text=colors[col], variable=radVar,
value=col,
command=radCall)
curRad.grid(column=col, row=5, sticky=tk.W)
I get the point of using a loop, but I would expect the variable curRad to be used for instance as a list, ending up containing references to all those Radiobuttons. What is hapening here? Is Python somehow creating custom-named variables at each iteration? To me it looks like we're assigning a string to a variable and then assigning a reference to a widget to the same variable, and doing the same at each iteration.
What am I missing here?
The line curRad = 'rad' + str(col) accomplishes absolutely nothing, since the variable gets reassigned on the next line.
The code does not give you any lasting reference to the individual radio buttons - but you don't normally need one: determining which one is selected, or programmatically selecting one, is done via the variable (radVar) that they all share.
If you really wanted to keep a reference to each button, you could put:
allRads = []
above the loop, and:
allRads.append(curRad)
inside the loop.
I really like your solution, jason. You can reference later the buttons through the indexes of the list generated.
You can also create the buttons as follow
for col in range(3):
globals()["curRad" + str(col)] = tk.Radiobutton(win, text=colors[col], variable=radVar, value=col, command=radCall)
So the name of the variables associated to each button will be different, in this case:
curRad0
curRad1
curRad2
At the moment each option menu box replaces the previous one so if write ent1.get() i dont get the value within any box, how can i distinguish betweeen each optionmenu and therefor retrieve each value distinctly? Ideally calling them all by a different name decided by their position in the grid.
for x in range (xval):#creating the matrix
for y in range (yval):
variable = StringVar(root)
ent1 = OptionMenu(root, variable, *inputvalues)#creating the dropdown menus
ent1.config(width=3)
ent1.grid(row=(y+1), column=x)
Not sure if I understand correctly but if you are trying to create different StringVar's in a single loop, you could use the variable.format() method to make sure each StringVar is saved as a unique variable.
Thus the following loop will create StringVar's that are saved into variables ent1, ent2, ent3, etc. This will allow you to call them separately later on..
for x in range (xval):#creating the matrix
for y in range (yval):
variable = StringVar(root)
ent["ent{0}"].format(y+1) = OptionMenu(root, variable, *inputvalues)#creating the dropdown menus
ent["ent{0}"].format(y+1).config(width=3)
ent["ent{0}"].format(y+1).grid(row=(y+1), column=x)
Use a dictionary to keep track of the widgets and variables.
entries = {}
vars = {}
for x in range (xval):#creating the matrix
for y in range (yval):
variable = StringVar(root)
entry = OptionMenu(root, variable, *inputvalues)
entry.config(width=3)
entry.grid(row=(y+1), column=x)
entries[(x,y)] = entry
vars[(x,y)] = variable
I have 20 entries in my Tkinter GUI created using for-loop (there might be more of them in the future and I really don't want to have 50 lines of code just for deifining the entries). I need to collect entries values to create a numpy array out of them. As a shot in the dark I have tried this:
master = Tk()
R=StringVar()
namR = []
for ii in range(0,20):
namR.append(Entry(master), textvariable=R[ii])
namR[ii].grid(row=2+ii, column=3)
which obviously does not work (StringVar instance has no attribute '__getitem__'), but I think the goal is clear.
Any suggestions to make this work, please?
You should include your textvariable within the Entry() call, not after it (append(Entry(master, textvariable=xyz)) rather than append(Entry(master), textvariable=xyz)). append() won't know what to do with the second argument. Next, you can create a list for the StringVar objects and refer to them with something like Entry(master, stringvariable=svars[ii]). However, this is only necessary if you want to do things like variable tracing. If you just want to retrieve the text in an entry object, you can do it with my_entry.get().
master = Tk()
namR = []
for ii in range(0,20):
namR.append(Entry(master))
namR[ii].grid(row=2+ii, column=3)
[e.get() for e in namR] will then be a list of all the entry contents.