Cypress: Handle `alert` and `confirm` better

[brian-mann]

As it stands Cypress's current behavior is to auto accept alert and confirm.

We should make the following changes:

Alerts

• Alerts should at least log in the command log as a page event so you can visually see them
• Alert command log events should capture the alerted value for debugging purposes
• We should expose an event which enables you to listen to alerts and receive their values

Confirms

• Confirms should log in the command log as a page event so you can visually see them
• Confirms should auto accept by default, and save their values for debugging purposes
• However we should expose an event which enables you to listen for confirms and return false
• By returning false we will decline the confirmation as opposed to accept it.

You'll now see and have control over these events.

[brian-mann]

This is how they'll appear.

This is how the confirm event can be controlled:

it "can turn on and off confirmation", ->
      cy.on "window:confirm", (str) ->
        switch str
          when "foo" then false
          when "bar" then true
          when "baz" then undefined

      cy.window().then (win) ->
        confirmedFoo = win.confirm("foo")
        expect(confirmedFoo).to.be.false

        confirmedBar = win.confirm("bar")
        expect(confirmedBar).to.be.true

        ## undefined is not strictly false
        ## so the confirmation should be true
        confirmedBaz = win.confirm("baz")
        expect(confirmedBaz).to.be.true

[brian-mann]

The code for this is done, but has yet to be released. We'll update this issue and reference the changelog when it's released.

[brian-mann]

Fixed in 0.20.0

[drumbeg]

I realise that confirms originating from an iframe will appear, but is there a way to handle and dismiss them from a test?

[novarichuffman]

If it is a prompt box Cypress will not automatically accept it.

[FabiGomes]

Any news about how to working on with a prompt box ? Cypress still not automatically accept it.

[jennifer-shehane]

@FabiGomes Yes there are examples here: https://github.com/cypress-io/cypress-example-recipes/issues/339