Can't get custom:button-card to fire a javascript action

Configuration Frontend
1

Help please. When I click the button, nothing happens. Here is my code:

type: custom:button-card
name: GetMeOutOfHere
tap_action:
  action: javascript
  actions: >
    [[[
      alert('I am an alert box!');
    ]]]
2

Are you sure actions is the correct key there...? All the examples in the docs show javascript:

image
image973×106 12 KB

3

Thanks @Didgeridrew . I managed to get this working. What I really wanted to do was make a logout button with a confirmation. Here's the working code:

type: custom:button-card
name: GetMeOutOfHere
tap_action:
  action: perform-action
  perform_action: browser_mod.javascript
  data:
    code: >
      let text = "Are you sure you want to log out?\n\nClick OK to continue, or
      Cancel.";

      if (confirm(text) == true) {
        hass.auth.revoke(); 
        hass.connection.close(); 
        window.localStorage.clear();
        document.location.href = '/'; 
      } else {
        text = "You cancelled!";
      }