Elm utilities to trigger updates after a delay

example: https://elm-delay-examples.surge.sh/

Sometimes you need to trigger updates after a period of time (i.e. to wait for a css transition or animation to complete) or maybe you need to chain a sequence of these updates (for more complex states).

This library provides utilities to express this more tidily.

To trigger a single update after a period of time pass Delay.after as a command to the elm runtime:

FirstMessage -> ( model , Delay.after 500 SecondMessage )

After triggering FirstMessage, 500ms later update will be called with SecondMessage

Trigger -> ( model , Delay.sequence [ ( 1000, FirstMessage ) , ( 2000, SecondMessage ) , ( 1000, ThirdMessage ) ] )

by sending a Trigger Msg:

• after 1000ms update will be called with FirstMessage
• then after 2000ms update will be called with SecondMessage
• then after 1000ms update will be called with ThirdMessage

As a convenience if you'd only like to start a sequence if the model is in a particular shape you can use Delay.sequenceIf

Trigger -> ( model , Delay.sequenceIf (not model.updating) [ ( 1000, FirstMessage ) , ( 2000, SecondMessage ) , ( 1000, ThirdMessage ) ] )

If you'd like all the steps to have the same unit of time, use the Delay.withUnit helper

Trigger -> ( model , Delay.sequence Delay.withUnit Delay.seconds [ ( 1, FirstMessage ) , ( 2, SecondMessage ) , ( 1, ThirdMessage ) ] )