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Moving buttons into the header

The following features are available in:

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PDF.js Express Viewer

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PDF.js Express Viewer is a free viewer with limited capabilities compared to PDF.js Express Plus

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PDF.js Express Plus

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PDF.js Express Plus is a commercial PDF SDK for viewing, annotating, signing, form filling and more

In some cases, you may want to move items out of the overflow menu and into the main header.

For example, you may want to place the download button in the main header, like so:

The easiest way to do this is to simply create a new button and add your own functionality. In the example of the download button, we can add the button and apply an onClick handler that triggers the download API:

// Disable the original button in the overflow menu
  instance.UI.disableElements(['downloadButton'])

  // Create our own button
  instance.UI.setHeaderItems((header) => {
    header.getHeader('default').push({
      img: "icon-header-download",
      index: -1,
      type: "actionButton",
      element: 'downloadButton',
      onClick: () => {
        instance.UI.downloadPdf()
      }
    });
  });

For more information on adding header items, see this guide.

Other examples

Moving the "Fullscreen" button into the main header

instance.UI.disableElements(['fullscreenButton'])

  instance.UI.setHeaderItems((header) => {
    header.getHeader('default').push({
      img: "icon-header-full-screen",
      index: -1,
      type: "actionButton",
      element: 'fullScreenButton',
      onClick: () => {
        instance.UI.toggleFullScreen()
      }
    });
  });