Python Telegram Bot: Callback Data Issue with InlineKeyboardButton

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1

I’m stuck with my Python Telegram bot. It’s giving me a headache!

The problem shows up when I try to use dynamic callback_data for an InlineKeyboardButton. Here’s what’s happening:

  • Static text as callback_data works fine
  • When I use a variable (args) for callback_data, I get a Button_data_invalid error
  • The error pops up when I try to use the keyboard as reply_markup

I’m using the telegram and telegram.ext libraries. Here’s a simplified version of my code:

 def handle_query(update, context):
     query = update.callback_query
     user_info = f"{query.from_user.first_name}(@{query.from_user.username})"
     message = f"Ready player: {user_info}\nLooking for opponent..."
     
     button_data = {"action": "find_opponent", "player": user_info}
     keyboard = [[InlineKeyboardButton("Join", callback_data=json.dumps(button_data))]]
     reply_markup = InlineKeyboardMarkup(keyboard)

     context.bot.edit_message_text(
         text=message,
         inline_message_id=query.inline_message_id,
         parse_mode=ParseMode.HTML,
         reply_markup=reply_markup
     )

Any ideas what might be causing this? I’m totally stuck!

2

hey mate, i’ve had similar issues before. have u tried using str() to convert ur button_data to a string? sometimes the json.dumps() can be finicky. also, double-check ur telegram lib version - older ones can be buggy with callback_data. good luck!

3

I’ve encountered this issue before, and it can be quite frustrating. One thing that worked for me was limiting the size of the callback_data. Telegram has a maximum size limit for callback_data (64 bytes), which you might be exceeding with your JSON string.

Try simplifying your button_data structure. Instead of including the full user_info, you could use a unique identifier like the user’s ID. Something like this:

button_data = {"action": "find_opponent", "player_id": query.from_user.id}

This should reduce the data size significantly. If you still face issues, consider using a database to store more detailed information and just pass a reference ID in the callback_data.

Also, ensure you’re handling the callback data correctly in your callback query handler. The JSON parsing needs to happen there as well.

4

I’ve dealt with similar callback_data issues in my Telegram bots. One often overlooked aspect is the encoding of the data. Try using urllib.parse.quote() to encode your JSON string before setting it as callback_data. This ensures special characters are properly handled.

Also, consider breaking down complex data into smaller chunks. Instead of passing all user info, use a unique identifier and retrieve additional data server-side when processing the callback.

Lastly, double-check your bot’s API token. Sometimes, an outdated or incorrect token can cause unexpected behavior with inline keyboards. Regenerating the token might resolve the issue if all else fails.

Remember to thoroughly test each change to isolate the problem. Good luck with your bot!