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Added openvidu webcomponent tutorial

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[![License badge](https://img.shields.io/badge/license-Apache2-orange.svg)](http://www.apache.org/licenses/LICENSE-2.0)
[![Documentation badge](https://readthedocs.org/projects/fiware-orion/badge/?version=latest)](http://openvidu.io/docs/home/)
[![Docker badge](https://img.shields.io/docker/pulls/fiware/orion.svg)](https://hub.docker.com/r/openvidu/)
[![Support badge](https://img.shields.io/badge/support-sof-yellowgreen.svg)](https://groups.google.com/forum/#!forum/openvidu)
[![][OpenViduLogo]](http://openvidu.io)
openvidu-starter
===
Visit [openvidu.io/docs/tutorials/openvidu-starter/](http://openvidu.io/docs/tutorials/openvidu-webcomponent/)
[OpenViduLogo]: https://secure.gravatar.com/avatar/5daba1d43042f2e4e85849733c8e5702?s=120

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$(document).ready(() => {
var ov = document.querySelector('openvidu-webcomponent');
ov.addEventListener('joinSession', (event) => {
document.getElementById('main').style.display = 'none';
document.getElementById('session').style.display = 'block';
});
ov.addEventListener('leaveSession', (event) => {
document.getElementById('main').style.display = 'block';
document.getElementById('session').style.display = 'none';
});
ov.addEventListener('error', (event) => {
console.log('Error event', event.detail);
});
});
function joinSession() {
var ov = document.querySelector('openvidu-webcomponent');
var sessionId = document.getElementById('sessionId').value;
var user = document.getElementById('user').value;
getToken(sessionId).then((token) => {
ov.sessionConfig = { sessionId, user, token };
});
}
/**
* --------------------------
* SERVER-SIDE RESPONSABILITY
* --------------------------
* These methods retrieve the mandatory user token from OpenVidu Server.
* This behaviour MUST BE IN YOUR SERVER-SIDE IN PRODUCTION (by using
* the API REST, openvidu-java-client or openvidu-node-client):
* 1) Initialize a session in OpenVidu Server (POST /api/sessions)
* 2) Generate a token in OpenVidu Server (POST /api/tokens)
* 3) The token must be consumed in Session.connect() method
*/
var OPENVIDU_SERVER_URL = 'https://' + location.hostname + ':4443';
function getToken(mySessionId) {
return createSession(mySessionId).then((sessionId) => createToken(sessionId));
}
function createSession(sessionId) {
return new Promise((resolve, reject) => {
$.ajax({
type: 'POST',
url: OPENVIDU_SERVER_URL + '/api/sessions',
data: JSON.stringify({ customSessionId: sessionId }),
headers: {
Authorization: 'Basic ' + btoa('OPENVIDUAPP:MY_SECRET'),
'Content-Type': 'application/json',
},
success: (response) => resolve(response.id),
error: (error) => {
if (error.status === 409) {
resolve(sessionId);
} else {
console.warn('No connection to OpenVidu Server. This may be a certificate error at ' + OPENVIDU_SERVER_URL);
if (
window.confirm(
'No connection to OpenVidu Server. This may be a certificate error at "' +
OPENVIDU_SERVER_URL +
'"\n\nClick OK to navigate and accept it. ' +
'If no certificate warning is shown, then check that your OpenVidu Server is up and running at "' +
OPENVIDU_SERVER_URL +
'"',
)
) {
location.assign(OPENVIDU_SERVER_URL + '/accept-certificate');
}
}
},
});
});
}
function createToken(sessionId) {
return new Promise((resolve, reject) => {
$.ajax({
type: 'POST',
url: OPENVIDU_SERVER_URL + '/api/tokens',
data: JSON.stringify({ session: sessionId }),
headers: {
Authorization: 'Basic ' + btoa('OPENVIDUAPP:MY_SECRET'),
'Content-Type': 'application/json',
},
success: (response) => resolve(response.token),
error: (error) => reject(error),
});
});
}

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<!DOCTYPE html>
<html>
<head>
<title>openvidu-web-component</title>
<link rel="shortcut icon" href="assets/images/favicon.ico" type="image/x-icon">
<script src="https://code.jquery.com/jquery-3.3.1.min.js" integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8="
crossorigin="anonymous"></script>
<!-- OpenVidu WebComponent -->
<link rel="stylesheet" href="openvidu-webcomponent.css">
<script type='application/javascript' src='openvidu-webcomponent.js'></script>
<!-- OpenVidu WebComponent -->
<script src="app.js"></script>
</head>
<body>
<div id="main" style="text-align: center;">
<h1>Join a video session</h1>
<form onsubmit="joinSession(); return false" style="padding: 80px; margin: auto">
<p>
<label>Session:</label>
<input type="text" id="sessionId" value="SessionA" required>
</p>
<p>
<label>User:</label>
<input type="text" id="user" value="User1">
</p>
<p>
<input type="submit" value="JOIN">
</p>
</form>
</div>
<openvidu-webcomponent id="session" style="display: none;"></openvidu-webcomponent>
</body>
</html>

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