A more practical example please.

[FrankFang]

Could you show some examples like this?

+----------+     +-----------+    +------------+
|          |     |           |    |            |
|  button  +---->+   loading +--->+   succeed  |
|          |     |           |    |            |
+----------+     +-----+-----+    +------------+
                       |
                       |
                 +-----v-----+
                 |           |
                 |   failed  |
                 |           |
                 +-----------+

[Brooooooklyn]

#2 (comment)

[FrankFang]

Thanks. It looks confusing for me. But I'll try to understand it.