{"id":10045,"date":"2021-08-15T11:34:06","date_gmt":"2021-08-15T09:34:06","guid":{"rendered":"https:\/\/pythonprogramming.altervista.org\/?p=10045"},"modified":"2021-08-15T12:44:28","modified_gmt":"2021-08-15T10:44:28","slug":"tkinter-azure-theme-handle-errors","status":"publish","type":"post","link":"https:\/\/pythonprogramming.altervista.org\/tkinter-azure-theme-handle-errors\/","title":{"rendered":"How to handle errors in input in an entry in tkinter with the azure theme ttk"},"content":{"rendered":"\n

Today we are going to see how to manage errors in tkinter, meaning: how can we get a feedback when the user input is not right. We are going to make a first simple example in which and entry becomes red (the border will become red) when the input is not what we expected.<\/p>\n\n\n\n

This is when it’s right<\/p>\n\n\n\n

\"\"<\/a><\/figure>\n\n\n\n

This is not valid<\/p>\n\n\n\n

\"\"<\/a><\/figure>\n\n\n\n

The code<\/p>\n\n\n\n

import tkinter as tk\nimport tkinter.ttk as ttk\nfrom PIL import ImageTk\n# create the window\nroot= tk.Tk()\nroot.title(\"Example Error handling\")\nroot.geometry(\"400x200\")\n\n# Give it this theme (put the folder azure dark here\nstyle = ttk.Style(root)\nroot.tk.call('source', 'theme\/azure dark\/azure dark.tcl')\nstyle.theme_use('azure')\n\n# Entry widget\nstrvar= tk.IntVar()\nentry = ttk.Entry(root,textvariable=strvar)\nentry.place(x=10,y=10)\ndef check():\n    print(entry.get())\n    button.config(relief=\"flat\")\n    if int(entry.get()) < 1:\n        entry.state([\"invalid\"])\n    else:\n        entry.state([\"!invalid\"])\n\nbtnimage = ImageTk.PhotoImage(file=('button.png'))\nbutton=tk.Button(root,\n    image=btnimage,\n    bd=0,\n    activebackground=\"#333333\",\n    relief=\"flat\",\n    text=\"Click\",\n    compound=tk.CENTER,\n    command=check)\nbutton.place(x=5,y=50)\nroot.mainloop()<\/pre>\n\n\n\n
The repository with all the files (images and the theme): here it is<\/a>.<\/p>\n\n\n\n
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