How to Set Text of Tkinter Entry Widget With a Button

1. Tkinter delete and insert Method to Set the Content of Entry
2. Tkinter StringVar Method to Set Content of Tkinter Entry Widget

We have two methods to set or change the text of Tkinter Entry widget by clicking a Tkinter button,

1. Tkinter delete and insert Method
2. Tkinter StringVar Method

Tkinter delete and insert Method to Set the Content of Entry

Tkinter Entry widget doesn’t have a dedicated set method to set the content of the Entry. It needs to first delete the existing content and then insert the new content if we have to change the content completely.

Complete Working Codes to Set Text in Entry With delete and insert Methods

import tkinter as tk

root = tk.Tk()
root.geometry("400x50")


def setTextInput(text):
    textExample.delete(0, "end")
    textExample.insert(0, text)


textExample = tk.Entry(root)
textExample.pack()

btnSet = tk.Button(
    root, height=1, width=10, text="Set", command=lambda: setTextInput("new content")
)
btnSet.pack()

root.mainloop()

textExample.delete(0, "end")

delete method of Entry deletes the specified range of characters in the Entry.

0 is the first character and "end" is the last character of the content in the Entry widget. Therefore, delete(0, "end") deletes all the content inside Entry box.

textExample.insert(0, text)

insert method inserts the text at the specified position. In the above code, it inserts the text at the beginning.

Tkinter StringVar Method to Set Content of Tkinter Entry Widget

If the content of Tkinter Entry widget has been associated with a StringVar object, it could automatically change the content of Tkinter Entry widget every time the value of StringVar is updated.

Complete Working Codes to Set Text in Entry With StringVar Object

import tkinter as tk

root = tk.Tk()
root.geometry("400x50")


def setTextInput(text):
    textEntry.set(text)


textEntry = tk.StringVar()

textExample = tk.Entry(root, textvariable=textEntry)
textExample.pack()

btnSet = tk.Button(
    root, height=1, width=10, text="Set", command=lambda: setTextInput("new content")
)
btnSet.pack()

root.mainloop()

textEntry = tk.StringVar()

textExample = tk.Entry(root, textvariable=textEntry)

textEntry is a StringVar object and it is associated with the text content, or in other words textvariable option in Entry widget.

textEntry.set(text)

If textEntry is updated to have a new value text, then the widgets whose textvariable are associated with it will be automatically updated.