When my bot generates plain message answers that include a color hex code, a color block shows. But when formatted as a table block, it doesn't. Anyone knows how to fix that?
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This is a known limitation of Slack Block Kit.
The automatic "Color Swatch" preview (the little colored square) that appears next to Hex codes (e.g., #FF0000) is a feature of the standard Text Object (mrkdwn).
Why it fails in Tables:
Slack's new
"Table Block" (released in beta/late 2024) does not fully support all rich text features inside the cells yet. It often treats cell content as "Plain Text" or restricted markdown, which strips out the auto-generated color preview.Workaround:
You cannot "fix" the Table Block behavior. Instead:
- Use an Image: Generate a tiny 10x10px image of that color and insert it as an image element in the block (if not using a table).
- Use Emoji: If the colors are standard (Red, Blue, Green), map them to emojis (🔴, 🔵, 🟢) inside the table cell.
- Abandon Table Block: Use a series of Section Blocks with "Fields" (Columns). Section blocks fully support mrkdwn, so the Hex color preview will reappear.
- https://trailblazers.salesforce.com/profileView?u=005KX000003d0L3YAI
