Dialogs are objects that allow you to create NPC characters that you can talk with, using a built-in interface. It's very easy to use, and doesn't even require scripting. However, you can add extra functionality with the event DialogChoiceSelected.
You can use them to:
Dialogs are actually very easy to use, with no scripting necessary for those of you who aren't accomplished in Lua. They form like this:
The Dialog object displays the initial prompt, which then gives the user the choice of replies from the DialogChoice objects. The DialogChoice then gives the user the choice of replies from the DialogChoice objects inside itself.
First, open Roblox Studio and create a new place. In explorer (View -> Explorer), select the part you want the speech bubble to appear above. Click Insert, select Basic Objects, and in the window that appears select 'Dialog'. There's your initial dialog object created! You won't be able to see a speech bubble appear until you run the game with a character in (online or test solo). In the properties window (View -> Properties), you will see the InitialPrompt property. Change this to what you want the part to say as soon as you click on the speech bubble.
Hooray! You've got your first part to speak when you click on its icon!
So, you've got your speech bubble. That's great and all, but you can't talk to it, can you? Select the original Dialog object and click Insert, then Basic Objects, and from the window select DialogChoice. In the properties window that you should have open, you will see a property called UserDialog. This is the choice that the user will be given, not the name of it or any other properties. The property ResponseDialog is what the part will say when the user selects that option, change it to what you want that to be. You can add as many DialogChoice objects to the original Dialog object to give the user that amount of choices.
Our Dialog now has several choices from the user to choose from, which result in the part giving a response. Additionally, we can add choices to those choices, creating a larger conversation with the part. To do this, all you need to do is complete the previous step but instead of inserting DialogChoice objects into the original Dialog object, you insert them into an existing DialogChoice objects.
You can customise your Dialog further with additional properties. Change these with the properties window. Note: These are only the properties that will have a visible effect in game.
ConversationDistance: Set this to the maximum distance from which you can talk to the part. If you start within the distance and then walk out of it, the conversation will end.
Purpose: These are the different icons that appear above the part for you to click on. 'Quest' is a '!', 'Help' is a '?' and 'Shop' is a '$'.
Tone: This is the color of the conversation - the speech bubble, and the choice GUI. 'Friendly' is green, 'Neutral' is blue and 'Enemy' is red.
Here's an example of a Dialog being used.
If you're accomplished with Roblox Lua, you can add even more functionality to your NPC part. The scripting event DialogChoiceSelected holds two arguments - the player object and the object of the choice the player selects. It does not return the name of the choice. It fires whenever the player selects a choice.
That would print the name of the player and the name of the choice selected whenever the player selects a choice. You can't localise it to a specific choice with the Dialog methods. If you want to make something happen whenever a player selects a specific choice, you need to give it a unique Name property and compare it with an if statement.
You can make something happen whenever a certain player selects a certain choice as well.
With this event, you can give characters quests, rewards, shop items and more!