> 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 %}


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation by asking a question.

Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:

```
GET https://docs.apryse.com/web/get-started/samples/readermodetest.md?ask=<question>&goal=<user_goal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.