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.
Related
sort of a beginner at python programming but ive run into a roadblock and need a little assistance. i have a data base of two items, which are basically just a name for a crypto, and a id that needs to be passed later. i'm trying to use the for loop to create checkbuttons that take the id as the onvalue so that i can get them from the variable and pass them later. I'm trying to create these checkbuttons inside of a labelframe that's attached to a different window, but I'm calling Tk and running mainloop and everything is set up properly, its just one little issue ill explain down below
here's whats contained in the coinlist db database and fetchedcoins variable:
[('Bitcoin', 'bitcoin', 1), ('Ethereum', 'ethereum', 2)]
so when i iterate through the database for the first item, it sets the id variable to the on value properly, but when it hits the second item, it replaces the previous coinid data in the checkbutton var variable with the coinid of the new coin, and as a result when i activate the pasteids function and get the checkbutton variable to use in a label, it only returns the onvalue for the checkbutton of the last item of the list, since that was the database item that was last loaded into the variable. even if the last item is deselected and the other is selected, the other items on value returns false. im wondering if theres a way for me to create different variables for each item of the loop, so that the state variable var doesnt only reflect the state of the last button that was created. any tips or workarounds help are greatly appreciated
def selectcoins():
selectframe = LabelFrame(avreadermain, text='Select Coins')
selectframe.grid(row=1,column=0,padx=20,pady=15,sticky=W+E)
conn = sqlite3.connect('coinlist.db')
cursor = conn.cursor()
cursor.execute('SELECT *, oid FROM coins')
fetchedcoins = cursor.fetchall()
for coins in fetchedcoins:
coinid = coins[1]
coinname = coins[0]
var = StringVar()
c = Checkbutton(selectframe, text=coinname, variable=var,onvalue=coinid,offvalue='false')
c.deselect()
c.pack()
def pastedids():
coinids = Label(selectframe,text=var.get())
coinids.pack()
showidbtn = Button(selectframe,text='show IDs',command=pastedids)
showidbtn.pack()
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.
So I know how to retrieve the text from a single entry widget using the get function but now I am trying to create multiple entry widgets at the same time using a for loop. How can I go back and retrieve the text from anyone of the entry widgets once the user types in them?
rows=11
for line in range(10):
rows=rows+1
widget = Tk.Entry(self.frame)
widget.grid(row=rows, column=5)
The problem is that all of your widget objects are being assigned to a reference, and with each next iteration of the loop are being unreferenced. A way to fix this is to create a list and add these widgets to the list:
entries = []
for line in range(10):
rows = rows + 1
widget = Tk.Entry(self.name)
widget.grid(row = rows, column = 5)
entries.append(widget) # Add this line to your code
Now, to access a specific entrybox, you just find it in the array. So, for example, the second box will be found at entries[1] (because it is 0-based).
The fundamental problem you're having is that you don't have any sort of data structure. Are you familiar with the list type?
rows=11
entries = [Tk.Entry(self.frame) for item in range(10)]
for item in entries:
rows=rows+1
item.grid(row=row, column=5)
This creates a list of Entry widgets, then goes through that list and grids each one into a row (starting with 12). You can access list items by index, e.g. entries[0] for the first Entry.
widgets = []
for i in range(11, 23):
widgets.append(Tk.Entry(self.frame))
widget[i-11].grid(row = i, column = 5)
To answer your question directly, you need the get() method, which is available to the Entry class. To get the value of your widget object, the code would look something like this:
myValue = widget.get()
Please note that, as others have mentioned, your "for" loop does not actually create 10 Entry objects. Since you keep reassigning your new Entry objects to the variable "widget", the old Entry object you created gets de-referenced. Instead of assigning each new Entry object to the variable "widget", append them to a list instead.