> For the complete documentation index, see [llms.txt](https://docs.apryse.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.apryse.com/web/get-started/samples/ui.md).

# Customizing UI - WebViewer

JavaScript to customize PDF viewer toolbar, menu & UI. Modifying header, turn on feature sets or hide annotation icons. Import your own colors & custom icons

{% hint style="info" %}
**Requirements**

*These packages are required to use these features in production. Trial keys have unlimited access to all features*

<a href="/web/get-started/readme.md" class="button primary">Web SDK</a><a href="https://showcase.apryse.com/toolbar-customization" class="button primary">Live demo</a>
{% endhint %}

This JavaScript sample shows you how to customize the UI, toolbar and menus of our PDF Viewer using APIs. You can create a simplified UI to match your user’s experience levels or their task requirements by modifying header, enabling/disabling feature sets or hiding individual annotation icons. You can also import your own colors into WebViewer and embed custom icons into the toolbar to match your look and feel.

This sample works on all browsers (including IE11) and mobile devices without using plug-ins.

For more detailed information on configuring UI please see visit our [WebViewer UI guide](/web/ui-customization/hiding-elements.md). Learn more about our [Web SDK](/web/get-started/guides.md).

{% tabs %}
{% tab title="JavaScript" %}
{% code lineNumbers="true" %}

```js
// eslint-disable-next-line no-undef
const WebViewerConstructor = isWebComponent() ? WebViewer.WebComponent : WebViewer;

WebViewerConstructor(
  {
    path: '../../../lib',
    initialDoc: 'https://pdftron.s3.amazonaws.com/downloads/pl/demo-annotated.pdf',
  },
  document.getElementById('viewer')
).then(instance => {
  samplesSetup(instance);
  const { setHeaderItems, enableElements, disableElements, enableFeatures, disableFeatures, setTheme, Feature, Theme } = instance.UI;

  const findFirstDividerIndex = items => {
    for (let i = 0; i < items.length; ++i) {
      if (items[i].type === 'divider') {
        return i;
      }
    }
  };

  const reverseHeaderItems = () => {
    // Change header items
    setHeaderItems(header => {
      const items = header.getItems();
      // reverse all items after first divider
      const indexAfterFirstDivider = findFirstDividerIndex(items) + 1;
      // could use findIndex if you don't need to support IE
      // const indexAfterFirstDivider = items.findIndex(item => item.type === 'divider') + 1;
      const itemsToReverse = items.slice(indexAfterFirstDivider);
      itemsToReverse.reverse();

      header.update([].concat(items.slice(0, indexAfterFirstDivider), itemsToReverse));
    });
  };

  const toggleElement = (e, dataElement) => {
    // Enable/disable individual element
    if (e.target.checked) {
      enableElements([dataElement]);
    } else {
      disableElements([dataElement]);
    }
  };

  if (NodeList && !NodeList.prototype.forEach) {
    NodeList.prototype.forEach = Array.prototype.forEach;
  }

  if (HTMLCollection && !HTMLCollection.prototype.forEach) {
    HTMLCollection.prototype.forEach = Array.prototype.forEach;
  }

  document.getElementsByName('header').forEach(radioInput => {
    radioInput.onchange = () => {
      reverseHeaderItems();
    };
  });

  document.getElementById('ribbons').onchange = e => {
    // Enable/disable ribbons
    if (e.target.checked) {
      enableFeatures([Feature.Ribbons]);
    } else {
      disableFeatures([Feature.Ribbons]);
    }
  };

  document.getElementById('text-selection').onchange = e => {
    // Enable/disable text selection
    if (e.target.checked) {
      enableFeatures([Feature.TextSelection]);
    } else {
      disableFeatures([Feature.TextSelection]);
    }
  };

  document.getElementById('annotations').onchange = e => {
    // Enable/disable annotations
    if (e.target.checked) {
      enableFeatures([Feature.Annotations]);
    } else {
      disableFeatures([Feature.Annotations]);
    }
  };

  document.getElementById('notes-panel').onchange = e => {
    // Enable/disable notes panel
    if (e.target.checked) {
      enableFeatures([Feature.NotesPanel]);
    } else {
      disableFeatures([Feature.NotesPanel]);
    }
  };

  document.getElementById('file-picker').onchange = e => {
    // Enable/disable file picker
    if (e.target.checked) {
      enableFeatures([Feature.FilePicker]);
    } else {
      disableFeatures([Feature.FilePicker]);
    }
  };

  document.getElementById('print').onchange = e => {
    // Enable/disable print
    if (e.target.checked) {
      enableFeatures([Feature.Print]);
    } else {
      disableFeatures([Feature.Print]);
    }
  };

  document.getElementById('download').onchange = e => {
    // Enable/disable download
    if (e.target.checked) {
      enableFeatures([Feature.Download]);
    } else {
      disableFeatures([Feature.Download]);
    }
  };

  document.getElementById('view-controls').onchange = e => {
    toggleElement(e, 'viewControlsButton');
  };

  document.getElementById('search').onchange = e => {
    toggleElement(e, 'searchButton');
  };

  document.getElementById('pan-tool').onchange = e => {
    toggleElement(e, 'panToolButton');
  };

  document.getElementById('page-nav').onchange = e => {
    toggleElement(e, 'pageNavOverlay');
  };

  document.getElementById('default').onchange = e => {
    if (e.target.checked) {
      reverseHeaderItems();
    }
  };

  document.getElementById('reverse').onchange = e => {
    if (e.target.checked) {
      reverseHeaderItems();
    }
  };

  document.getElementsByName('theme').forEach(radioInput => {
    radioInput.onchange = e => {
      if (e.target.id === 'light' && e.target.checked) {
        setTheme(Theme.LIGHT);
      } else {
        setTheme(Theme.DARK);
      }
    };
  });
});
```

{% endcode %}
{% endtab %}
{% endtabs %}


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