> 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/reusable-content/guide/guide-gs-cordova-viewadoc.md).

# guide/gs/cordova/viewAdoc

Replace \`index.js\` with the following:

```js
/* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */
var app = {
    // Application Constructor
    initialize: function() {
        document.addEventListener('deviceready', this.onDeviceReady.bind(this), false);
    },

    // deviceready Event Handler
    //
    // Bind any cordova events here. Common events are:
    // 'pause', 'resume', etc.
    onDeviceReady: function() {
        this.receivedEvent('deviceready');
    },

    onTopLeftButtonPressed: function () {
      console.log('onTopLeftButtonPressed');
    },

    // Update DOM on a Received Event
    receivedEvent: function(id) {
        var parentElement = document.getElementById(id);
        var listeningElement = parentElement.querySelector('.listening');
        var receivedElement = parentElement.querySelector('.received');

        listeningElement.setAttribute('style', 'display:none;');
        receivedElement.setAttribute('style', 'display:block;');

        console.log('Received Event: ' + id);

        var viewerElement = document.getElementById('viewer');
        var viewer = new PDFTron.NativeViewer({
          l: '<your-key-here>',
          initialDoc: 'https://pdftron.s3.amazonaws.com/downloads/pl/PDFTRON_mobile_about.pdf',
          disabledElements: [
            // hide elements as you wish
          ]
        }, viewerElement);

        document.addEventListener("topLeftButtonPressed", this.onTopLeftButtonPressed.bind(this), false);
    }
};

app.initialize();
```

### Next step

<a href="/ios/guides.md" class="button primary">Guides</a><a href="https://github.com/iKettles/apryse-gitbook/tree/main/ios/samples/README.md" class="button primary">Samples</a><a href="https://sdk.apryse.com/api/ios/index.html" class="button primary">API docs</a>


---

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