Block.data property lost

[lingareddy kotanka]

Hello Team,

I created custom blocks using JOSN format and want to add some data to it(meta data), so i make use of 'data' property in block.
as used in docs:

https://developers.google.com/blockly/guides/create-custom-blocks/define-blocks?hl=en#block_data

after setting some value, when i try to access the data property is set to null. 

Could you please assist on this?

const start_stop = [

      {

        "type": "outputBlock",

        "lastDummyAlign0": "CENTRE",

        "message0": "Output",

        "previousStatement": null,

        "tooltip": "",

        "helpUrl": "",

        "style": "inputOutput",

        "data": "some value"

      }

    ];

Blockly.defineBlocksWithJsonArray(start_stop);

[Neil Fraser]

Small point of confusion: The 'data' property is part of the JSON and XML save formats, not a part of the JSON block definition formats.

There's no need for a 'data' property in the block definition since 'type' will be unique anyway.

Does that make sense?

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Neil Fraser, Switzerland
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[Mark Friedman]

Lingareddy,

  I believe that Neil's point is that the data property that you would be specifying would be the same for all blocks of the type (e.g. "outputBlock") that you are defining.  Consequently, rather than having it be a property of the block, it could just be a constant, based on the block type, and referenced as such in your renderer.  If it turns out that the metadata is really per block, rather than per block type, you would just set it directly on the block via code.

-Mark

On Wed, Apr 12, 2023 at 12:38 PM lingareddy kotanka <ikot...@gmail.com> wrote:

Hello Team,

Okay, so is there any way we can attach some metadata to block definition?

because i will need that info in my custom renderer class to define some constants based on it.

Thank you

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