Web App
With web app you can render web content
It is early!
This function under progress.

Demo bot

BBWebAppBot
Telegram

Quickly start

Telegram have Web Apps now. So BB supports Web Apps too.
It is possible render text (html, css, js, json...) content to web. For example:
// command webExample
// get url for Web page
var url = WebApp.getUrl({ command: "webExample" });
// we can get page url on bot
Bot.inspect(url);
// html content
var content = "<h1>Hello from " + bot.name + "</h1>"
// render this command in web
WebApp.render({ content: content });
Go to bot and sent text webExample. You will have link to this page:

Templates

It is hard to edit html in Java Script. Templates are a good way to organize your web application.
// command index
WebApp.render({ template: "index.html" });
and command "index.html":
<!-- it is html template. -->
<html>
<body>
<h1>Hello from <%bot.name%></h1>
<!-- Just calc 2+2 -->
2 + 2 = <% 2+2 %>
</body>
</html>
You can use bjs tag: <% your BJS code %> in this template.
We have:

Passing Variables

Do not use long code in bjs tag <% %>
It is bad. You can pass any vars to template
For example we can pass CSS file and test variable.
Command "index":
// command index
var botLink = "http://t.me/" + bot.name;
var CSSFile = WebApp.getUrl({ command: "renderCSS" })
WebApp.render({
template: "index.html",
options: {
botLink: botLink,
CSSFile: CSSFile
}
});
command "index.html":
<!-- it is html template. -->
<html>
<!-- // include template app.css -->
<head>
<link rel="stylesheet" href="<% options.CSSFile %> ">
</head>
<body>
<h1>Hello from <a href="<% options.botLink%>"> <%bot.name%></a></h1>
<!-- Just calc 2+2 -->
2 + 2 = <% 2+2 %>
</body>
</html>
command "renderCSS":
WebApp.render({ template: "example.css" });
command "example.css":
// It is CSS file
body {
font-family: 'Share Tech', sans-serif;
font-size: 15px;
color: white;
display: flex;
jsutify-content: center;
align-items: center;
margin: 0;
width: 100vw;
height: 100vh;
text-shadow: 8px 8px 10px #0000008c;
background-color: #343a40;
background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='28' height='49' viewBox='0 0 28 49'%3E%3Cg fill-rule='evenodd'%3E%3Cg id='hexagons' fill='%239C92AC' fill-opacity='0.25' fill-rule='nonzero'%3E%3Cpath d='M13.99 9.25l13 7.5v15l-13 7.5L1 31.75v-15l12.99-7.5zM3 17.9v12.7l10.99 6.34 11-6.35V17.9l-11-6.34L3 17.9zM0 15l12.98-7.5V0h-2v6.35L0 12.69v2.3zm0 18.5L12.98 41v8h-2v-6.85L0 35.81v-2.3zM15 0v7.5L27.99 15H28v-2.31h-.01L17 6.35V0h-2zm0 49v-8l12.99-7.5H28v2.31h-.01L17 42.15V49h-2z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E"), linear-gradient(to right top, #343a40, #2b2c31, #211f22, #151314, #000000);
}
h1 {
margin: 40px;
display: inline-grid;
}
Our result now:

Deployment in Telegram

You can install Web App in several ways

Inline button

var webExample = WebApp.getUrl({ command: "webExample" });
Api.sendMessage({
text: "🤑 Try our web page",
reply_markup: { inline_keyboard: [
[
// open the any web page on button pressing
{ text: "open Demo Page (from help)", web_app: { url: webExample } },
]
]}
});

Keyboard button

var webExample = WebApp.getUrl({ command: "webExample" });
Api.sendMessage({
text: "It is example for BB Web App",
reply_markup: {
resize_keyboard: true,
keyboard: [
// line 1
[
{ text: "🤑 Open Web App" },
{ text: "Open App", web_app: { url: webExample } }
]
]
}
})
For another ways please see Telegram Help