Link to Safari "Add to Home Screen" from Inside App

Link to Safari Add to Home Screen from inside app?

If you paste these characters into any online base64 decoder, you'll get the following:

<!DOCTYPE HTML>
<html>

<head id="htmlHead">
<meta name="viewport" content="width=device-width; initial-scale=1.0; maximum-scale=1.0; user-scalable=no;" />
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta name="apple-mobile-web-app-capable" content="no" />
<title>Promote Groups or Pages</title>
<link rel="apple-touch-icon-precomposed" href="data:image/png;base64,
</head>

<body>
<a id="redirect" href="fb-groups://group?id=1503507809911018&s=s"></a>
</body>

</html>
<script type="text/javascript">
function jump() {
var e = document.getElementById('redirect');
var ev = document.createEvent('MouseEvents');
ev.initEvent('click', true, true, document.defaultView, 1, 0, 0, 0, 0, false, false, false, false, 0, null);
e.dispatchEvent(ev);
window.close();
}
if (("standalone" in window.navigator) && window.navigator.standalone) {
document.body.style.backgroundColor = '#000000';
jump();
} else {
var time = 1422371365;
var timeout = new Date().getTime() / 1000;
if (timeout > time + 4) {
document.write('</head><body bgcolor="#fff"><div align="center"></div>');
jump();
} else {
document.write(
####
)}
}
</script>

Instead of #### there is the following:

<style>
html,
body,
div,
span,
object,
iframe,
h1,
h2,
h3,
h4,
h5,
h6 {
margin: 0;
padding: 0;
border: 0;
font-size: 100%;
vertical-align: baseline;
font-family: HelveticaNeue-Light, sans-serif;
-webkit-touch-callout: none;
-webkit-user-select: none;
-khtml-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none
}
a {
color: inherit;
text-decoration: none
}
#headerBox {
width: 100%;
height: 48px;
border-bottom: .5px solid #979797;
background-color: #F6F6F6;
text-align: center
}
#popoverBox {
position: absolute;
bottom: 15px;
width: 290px;
height: 132px;
-webkit-border-radius: 11px;
border-radius: 11px;
background-color: #2891F7;
border: none;
margin-left: -145px;
left: 50%
}
#popoverBox:after {
top: 100%;
left: 50%;
border: solid transparent;
content: " ";
height: 0;
width: 0;
position: absolute;
pointer-events: none;
border-color: rgba(40, 145, 247, 0);
border-top-color: #2891F7;
border-width: 13px;
margin-left: -13px
}
.icon {
margin-bottom: 5px
}
#groupIconContainer {
margin-left: 40px;
width: 60px;
float: left;
height: 100%
}
#groupIcon {
height: 60px;
width: 60px;
-webkit-border-radius: 14px;
border-radius: 14px;
background-color: #FFF;
margin-top: 25px
}
#addToHomeIconContainer {
margin-right: 40px;
width: 60px;
float: right;
height: 100%
}
#addToHomeIcon {
margin-top: 25px
}
#arrow {
margin: 0 auto;
display: block;
margin-top: 49px
}
#infoText {
color: #141823;
font-size: 18px;
line-height: 28px;
text-align: center;
width: 280px;
height: 160px;
margin: auto;
position: absolute;
top: 0;
left: 0;
bottom: 0;
right: 0
}
.iconLabelContainer {
font-size: 12px;
color: #FFF;
line-height: 14px;
width: 100px;
height: 30px;
margin-left: -20px;
text-align: center
}
#groupCoverImage {
box-sizing: border-box;
-webkit-box-sizing: border-box;
background-size: cover;
background-position: center;
background-image: url("data:image/png;base64,
width: 52px;
height: 52px;
border-radius: 50%;
position: relative;
top: 4px;
left: 4px;
border: 0.5px solid rgba(0, 0, 0, 0.10);
}
</style>

<body>
<div id="headerBox"><span style="font-size:17px;color:#2891F7;line-height:20px;position:relative;top:13.5px"><a href="fb-groups://">Отмена</a></span>
</div>
<div id="infoText">Коснитесь кнопки
<svg style="vertical-align:text-bottom" width="22px" height="30px" viewbox="0 0 44 60" version="1.1">
<defs></defs>
<g id="Final" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
<g id="Add-Group-to-Home-Screen" transform="translate(-299.000000, -459.000000)">
<g id="Tap-+-below-+-Share-Icon" transform="translate(231.000000, 458.000000)">
<g id="share-icon" transform="translate(60.000000, 0.000000)">
<path d="M20.4,12 L30,2.4 L39.6,12" id="Shape" stroke="#3F75FF" stroke-width="2"></path>
<path d="M30,39.0000013 L30,2.7996" id="Shape" stroke="#3F75FF" stroke-width="2"></path>
<rect id="Rectangle-path" x="0" y="0" width="60" height="60"></rect>
<path d="M20.2682927,20 L9,20 L9,60 L51,60 L51,20 L39.7317073,20" id="Shape" stroke="#3F75FF" stroke-width="2"></path>
</g>
</g>
</g>
</g>
</svg> ниже,
<br>Затем коснитесь “Добавить на основной экран”</div>
<div id="popoverBox">
<div id="groupIconContainer">
<div id="groupIcon" class="icon">
<div id="groupCoverImage"></div>
</div>
<div class="iconLabelContainer">Promote Groups or Pages</div>
<!-- Replace with dynamic name -->
</div>
<div id="addToHomeIconContainer">
<svg id="addToHomeIcon" width="60px" height="60px" viewbox="0 0 120 120" version="1.1">
<defs></defs>
<g id="Add-Group-to-Home-Screen-Spec" transform="translate(-410.000000, -802.000000)">
<g id="Add-to-Home-Screen" transform="translate(367.000000, 802.000000)">
<g id="Add-to-Home-Screen-Icon" transform="translate(43.000000, 0.000000)">
<rect id="Rectangle-6" fill="#FFFFFF" x="0" y="0" width="120" height="120" rx="28"></rect>
<rect id="Rectangle-6" fill="#686870" x="25" y="25" width="70" height="70" rx="15"></rect>
<path d="M58,58 L58,46.991617 C58,45.8978404 58.8954305,45 60,45 C61.1122704,45 62,45.8916773 62,46.991617 L62,58 L73.008383,58 C74.1021596,58 75,58.8954305 75,60 C75,61.1122704 74.1083227,62 73.008383,62 L62,62 L62,73.008383 C62,74.1021596 61.1045695,75 60,75 C58.8877296,75 58,74.1083227 58,73.008383 L58,62 L46.991617,62 C45.8978404,62 45,61.1045695 45,60 C45,58.8877296 45.8916773,58 46.991617,58 L58,58 Z" id="Rectangle-8" fill="#FFFFFF"></path>
</g>
</g>
</g>
</svg>
<div class="iconLabelContainer">Добавить на
<br>основной экран</div>
</div>
<svg id="arrow" width="12px" height="20px" viewbox="0 0 24 40" version="1.1">
<defs></defs>
<g id="Explorations" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
<g id="Add-Group-to-Home-Screen" transform="translate(-307.000000, -847.000000)" stroke-linecap="round" stroke="#FFFFFF" stroke-width="5">
<g id="Group" sketch:type="MSLayerGroup" transform="translate(30.000000, 752.000000)">
<path d="M297,132 L280,115 L297,98" id="Path-35" transform="translate(288.500000, 115.000000) rotate(-180.000000) translate(-288.500000, -115.000000) "></path>
</g>
</g>
</g>
</svg>
</div>
<div id="popoverNub"></div>');

So I believe their implementation is as follows:

1) There is a web server embedded in the application (something like RoutingHTTPServer). It's running on some port like 5555 and configured to return a page with contents like:

<HTML><script>window.location.href=[data:text/html;charset=UTF-8;base64, tens of thousands of characters in an alpha-numeric string]</script></HTML>

The syntax is wrong, but the idea is to replace the current URL (http://localhost:5555) with that base64 encoded data.

2) When you tap add to home page in the app, it opens the link http://localhost:5555 in the Safari, the web server inside the app responds with the web page, containing a script that replaces the URL with base64 encoded data (this data contains the current time, when the script was generated)

3)From the contents of the base64 encoded data you can see that there are two checks:

a)if the app is running not in Safari, but standalone

b)if some time has passed since the script was generated

If any of these statements is true, you are redirected into the app using deep link.
If both of them are false, the page prompting user to add link to home screen is shown (that's what I replaced with ####).

When the link is added to home screen, all these scripts and web pages are embedded into that link as base64 encoded data.

How do I create an Add to Home Screen instruction page for iOS web apps

You can detect if the site visitor is on an iOS device with some JavaScript then either show or hide the instructions based on a cookie:

  1. Check if device is running iOS:

    if(!(/iPad|iPhone|iPod/.test(navigator.userAgent) && !window.MSStream)){ return false; }
  2. Check if current view is already in webapp:

    if(window.navigator.standalone == true){ return false; }
  3. Check if you have created a cookie for this user already:

    if(document.cookie.search("alreadAsked") >= 0){ return false; }
  4. Prompt user by displaying an "Add to Homescreen" element on your page or redirecting to another page:

    document.getElementById("hiddenPrompt").style.display = 'inherit';
  5. Store a cookie so you will not ask the user after they have added it. You can also store the cookie after the user clicks a "done" button instead so the user will be prompted until they add it to the home screen or click a "do not show this again" button:

    document.cookie = "alreadAsked=true; expires=Thu, 18 Dec 2099 12:00:00 UTC";

All together now, this function will run on page load:

// On page load
(function() {
// Check if iOS
if(!(/iPad|iPhone|iPod/.test(navigator.userAgent) && !window.MSStream)){ return false; }

// Check if already in webapp
if(window.navigator.standalone == true){ return false; }

// Check if you already asked them to add to homescreen
if(document.cookie.search("alreadAsked") >= 0){ return false; }

// Ask user to add to homescreen
document.getElementById("hiddenPrompt").style.display = 'inherit';
});

// After clicking a button to dismiss prompt
function hidePromptInFuture(){
// Do not show prompt again
document.cookie = "alreadAsked=true; expires=Thu, 18 Dec 2099 12:00:00 UTC";
}

PWA: How to programmatically trigger : Add to homescreen? on iOS Safari

iOS - Safari currently don't support Web app install banner, like in Android - Chrome.

There is no way to programatically trigger install banner in Android as well, except for the case when you catch the beforeInstallPromot and use that to show the banner.

In the linked answer, you can check on the alternate option on how to show in app banner to guide user to add to home screen. Here is some code example for the same, which is iOS specific(look under #PROTIP 3).

Javascript for Add to Home Screen on iPhone?

Yes. The majority of modern browsers support the Add to Home screen (or A2HS) feature for Progressive Web Apps. To quote the Mozilla Web Docs article:

Add to Home screen is a feature available in
modern browsers that allows a user to "install" a web app, ie. add a
shortcut to their Home screen.

See also: A2HS browser support at caniuse.com



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