> ## Documentation Index
> Fetch the complete documentation index at: https://www.canva.dev/docs/print-partnerships/llms.txt
> Use this file to discover all available pages before exploring further.

# onBackClick

Registers a callback that runs when a user clicks the Back button in the editor's header.

**Tip:** This function does *not* run when then the user uses the native "back" feature in their browser.

**Tip:** If you don't register the `onBackClick` callback, the "Back" button still appears in the Canva editor, but nothing happens when the user clicks it.

## Usage

```javascript
(async () => {
  const api = await Canva.Partnership.initialize({
    apiKey: "<partner_api_key>",
    autoAuthToken: "<auto_auth_token>",
    container: document.getElementById("container"),
  });

  const onBackClick = () => {
    // the user has clicked the "Back" button in the editor's header
    console.log("You clicked the 'Back' button!");
  };

  const onProductSelect = (opts) => {
    api.createDesign({
      ...opts,
      onBackClick,
    });
  };

  api.showCatalog({
    onProductSelect,
  });
})();
```