> 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/readermodetest.md).

# Reader Mode Sample Code

JavaScript sample that lets you open documents in reader mode for easier reading.

{% 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="/web/full-api/full-api-overview.md" class="button primary">Full API</a>
{% endhint %}

This JavaScript sample lets you open documents in reader mode to make them easier to read. This sample works on all browsers (including IE11) and mobile devices without using plug-ins.

Learn more about our [Web SDK](/web/get-started/guides.md).

### **Implementation steps**

Step 1: [Get started with WebViewer](/web/get-started/readme.md) in your preferred web stack

Step 2: [Enable the full API](/web/full-api/full-api-overview.md)

Step 3: Add the sample code provided in this guide

This full sample is one of many included in the [manual download of WebViewer.](/web/get-started/manually.md#1-download-webviewer)

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

```js
(() => {
  window.addEventListener('viewerLoaded', () => {
    const instance = window.instance;
    const parentDocument = window.parent.document;

    instance.UI.enableElements(['readerPageTransitionButton']);

    parentDocument.getElementById('select').onchange = e => {
      instance.UI.loadDocument(e.target.value);
    };

    parentDocument.getElementById('file-picker').onchange = e => {
      const file = e.target.files[0];
      if (file) {
        instance.UI.loadDocument(file);
      }
    };

    parentDocument.getElementById('url-form').onsubmit = e => {
      e.preventDefault();
      instance.UI.loadDocument(parentDocument.getElementById('url').value);
    };

    instance.Core.documentViewer.addEventListener(
      'documentLoaded',
      () => {
        instance.UI.setZoomLevel(1);
        instance.UI.toggleReaderMode();
      },
      { once: true }
    );
  });
})();
// eslint-disable-next-line spaced-comment
//# sourceURL=config.js
```

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


---

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