Is there any way in the Slack API to have the submission button of a dialog open a new dialog or edit the current one?
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Not directly. You can use the response_url attached to the dialog submission sent to your server to then post a follow up ephemeral message to the user, containing a button to continue to the next dialog. Once clicked, you'll receive another trigger_id which you can send to dialog.open and start another dialog.
More information on triggers and where to find them can be found here.
Taylor Singletary
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Does this mean a `trigger_id` can only be used once? – Zachary Laborde Apr 09 '18 at 19:40
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Correct, it's single use with a limited time window. – Taylor Singletary Apr 11 '18 at 00:35
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How do you obtain the trigger_id? Can you get it from a simple slash command? – Ryan Jun 27 '18 at 02:54
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A `trigger_id` is attached to slash command invocations, message button or menu selections, action invocations, and dialog submissions. In all cases, they must be part of a Slack app -- legacy custom integration slash commands will not participate. – Taylor Singletary Jun 28 '18 at 20:23
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I don't get any `response_url` from my modal (before called dialog) – Dani Oct 25 '19 at 14:32