How to add default input

[bruh 9000]

I'm in Blockly Developer Tools and I can't figure out how to make it so that the input of a custom block will, by default, be filled in, as shown in the second attachment of the list block that is in Blockly's default library.

[Aaron Dodson]

In this case, the reddish "item" dropdown is its own separate block of type "variables_get". The nesting is actually part of the toolbox configuration, e.g. https://github.com/google/blockly/blob/develop/tests/playground.html#L883-L889, and not part of the block definition. Your test block definition is fine; you'll need to either define a separate block to go in the empty spot, or reference one of the built-in blocks, when you define your toolbox, and then your users will see the test block with its nested block when they open the toolbox, and be able to drag them out as one unit.

[bruh 9000]

Okay, thanks. How would I make that nested block to be a replaceable block that can be overwritten with another block?

[Aaron Dodson]

It should be already - once it's dragged out of the toolbox, the user should be able to drag out the nested block or drop another in its place.

[bruh 9000]

Okay, thanks