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Add PWA multidoc loader to examples #26680

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Feb 14, 2020
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Add PWA multidoc loader to examples #26680

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156 changes: 156 additions & 0 deletions examples/pwa-multidoc-loader.html
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Original file line number Diff line number Diff line change
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<!doctype html>
<html lang="en">
<head>
<title>PWA multidoc loader</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,minimum-scale=1,initial-scale=1">
<script async src="https://cdn.ampproject.org/shadow-v0.js"></script>
<style>
body {
margin: 0;
padding: 0;
font-family: sans-serif;
}
h2 {
text-align: center;
margin: 10px 0 0 0;
font-size: 20px;
line-height: 1;
}
.doc-container {
margin: 0.5em;
flex: 1;
max-height: calc(100vh - 1em - 30px);
height: calc(100vh - 1em - 30px);
width: calc(50vw - 1em);
display: flex;
flex-direction: column;
}
.form {
padding: 0.25em;
}
.host {
box-sizing: border-box;
border: 1px solid #333;
flex: 1 1 0;
overflow: auto;
}
.wrapper {
display: flex;
}
.url-row input[type="text"] {
width: 70%;
}
</style>
</head>
<body>
<h2>PWA multidoc loader</h2>
<div class="wrapper">
<div class="doc-container">
<form id="form1">
<div class="url-row"><label>URL1 <input type="text" id="ampurl1" placeholder="absolute or relative to examples/" value="amp-geo.amp.html"></label> <input type="submit" value="Go"></div>
<div><label><input type="checkbox" id="navint1"> Intercept anchor navigations</label></div>
</form>
<div id="shadowHost1" class="host"></div>
</div>
<div class="doc-container">
<form id="form2">
<div class="url-row"><label>URL2 <input type="text" id="ampurl2" placeholder="absolute or relative to examples/" value="amp-script/example.amp.html"></label> <input type="submit" value="Go"></div>
<div><label><input type="checkbox" id="navint2"> Intercept anchor navigations</label></div>
</form>
<div id="shadowHost2" class="host"></div>
</div>
</div>
<script>
(window.AMP = window.AMP || []).push(function(AMP) {
// Make ampdocs easily accessible for debugging
window.shadowDoc = {
'1': undefined,
'2': undefined
};

// Maintain references to URL inputs (accessed often)
const ampurlInputs = {
'1': document.getElementById('ampurl1'),
'2': document.getElementById('ampurl2')
};

// Fetch AMP page and attached to host element
const loadInPwa = function(url, docnum) {
const id = 'shadowHost' + docnum;
console.log('Navigating to: ' + url);

const xhr = new XMLHttpRequest();
xhr.open('GET', url);
xhr.responseType = 'document';
xhr.onreadystatechange = function () {
if (xhr.readyState === XMLHttpRequest.DONE) {
if (xhr.status === 200) {
// Close shadow AMP
(window.shadowDoc[id] ? window.shadowDoc[id].close() : Promise.resolve())
.then(() => {
// Restore host element
const oldHostElement = document.querySelector('#' + id);
const newHostElement = document.createElement('div');
newHostElement.id = id;
newHostElement.setAttribute('class', 'host');
oldHostElement.parentNode.replaceChild(newHostElement, oldHostElement);

window.shadowDoc[id] = AMP.attachShadowDoc(newHostElement, xhr.response, url);
const shadowBody = window.shadowDoc[id].ampdoc.getBody();
shadowBody.setAttribute('data-docnum', docnum);

// Listen for anchor clicks
shadowBody.onclick = clickHandler;
});
}
}
};
xhr.send();
};

// Optionally intercept anchor navigations
function clickHandler(event) {
const docnum = event.currentTarget.dataset.docnum;
const intercept = document.getElementById('navint' + docnum).checked;
if (!intercept)
return;

let anchor;
let node = event.target;
while (node && node.nodeType === Node.ELEMENT_NODE) {
if (node.tagName === 'A') {
anchor = node;
break;
}
node = node.parentNode;
}

if (anchor && anchor.href) {
event.preventDefault();
ampurlInputs[docnum].value = anchor.href;
loadInPwa(anchor.href, docnum);
}
}

const incomingUrlObj = new URL(location.href);
Object.keys(ampurlInputs).forEach((docnum) => {
// Check whether URL specified by param (e.g. &url1=)
const incomingUrl = incomingUrlObj.searchParams.get('url' + docnum);
if (incomingUrl) {
ampurlInputs[docnum].value = incomingUrl;
}

// Listen for user input URL
document.getElementById('form' + docnum).addEventListener('submit', function () {
event.preventDefault();
loadInPwa(ampurlInputs[docnum].value, docnum);
});

// Load AMP page in ShadowRoot
loadInPwa(ampurlInputs[docnum].value, docnum);
});
});
</script>
</body>
</html>