How to detect a players name in minecraft without testfor command in minecraft

Question

I know that you can use testfor @p, but imagine the adventure maps or story maps if you care about chats. You will see it knows your name; for example, if the player name is "345tyou", we can have a simulated conversation where the player name is substituted in:

(DAD):345tyou u have to buy cookies
(345tyou) okay dad

The map should be able to detect the player's username and substitute it in where required: like flowerpot22

(DAD):flowerpot22 u have to buy cookies
(Flowerpot22)okay dad

I think it has some thing to do with command blocks.

aytimothy · Answer

Try generating a Json String.
The selector allows you to dynamically substitute an entity's name in your text, with the argument being a selector string. For example:
..., {"selector": "@p"}, ...

Will print the closest player.

Note that @p will select the closest player to the command's source (command block, likely).
To select the player it is displayed to, use @s for 'self'.

How to detect a players name in minecraft without testfor command in minecraft

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