t.getContext()

Synchronously get the current context for t. This can be useful if you need the ID of a model that is in scope, or want to check user permissions.

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window.TrelloPowerUp.initialize({
  'card-buttons': function (t, opts) {
    var context = t.getContext();
    console.log(JSON.stringify(context, null, 2));
    return [];
  },
});

And the response would look like:

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{
  // id of the current board
  "board": "59287bae175fb20142c4c282",
  // id of the current card (if there is one)
  "card": "59287bec175fb20142c4c363",
  // capability command, (if there is one)
  "command": "card-buttons",
  // id of the current member, "notLoggedIn" if no member is logged in
  "member": "591f23d52a2eaa0c33e6c187",
  // id of the Workspace the board is in (if its in one)
  "organization": "538627f73cbb44d1bfbb58f0",
  // id of the enterprise the board is in (if its in one)
  "enterprise": "5cedada40a30f27bdb6e26b7",
  // read or write permissions for current member per modelType
  "permissions": {
    "board": "write",
    "organization": "write",
    "card": "write"
  },
  // the current color theme the member is using, e.g. null | "light" | "dark".
  // it can be null right after the Power-Up is initialized, but will be
  // updated as soon as the theme finishes loading. Complementing its
  // usage with t.subscribeToThemeChanges() is highly encouraged.
  "theme": null,
  // the locale of the browser, generally a standard 2 character ISO code
  // see https://datatracker.ietf.org/doc/html/rfc5646#section-2.1
  "locale": "en-US",
  // The color theme used to initialize the Power-Up.
  "initialTheme": "dark"
}

Troubleshooting

If t.getContext() is returning undefined in your Power-Up code, ensure you are calling t.signUrl() on your URLs. This ensures your Power-Up iframe HTML pages can communicate with Trello.

For example:

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TrelloPowerUp.initialize({
  'card-back-section': function (t, options) {
    return {
      title: 'Card Back Section',
      icon: MY_ICON,
      content: {
        type: 'iframe',
        url: t.signUrl('./card-back-section.html'), // call t.signUrl
      },
    };
  },
});

Now, you should be able to call t.getContext() without issues.

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// inside card-back-section.js
const t = window.TrelloPowerUp.iframe();

t.render(() => {
  console.log(t.getContext());
});