<embed-page>
Proof of concept for
Embeddable Progressive Application
- a microapplication container, a WebComponent acting as seamless IFRAME and html include
Where to use?
<embed-page/>
covers 2 extreme cases.
-
Super-simple development with library of pre-made microapplications and plain html codebase.
It assumes no web component knowledge and development.
-
Super-complex apps where on same page need to mix UX made with different frameworks and their incompatible otherwise revisions.
The JS Context insulation of embed-page provides "evolutionary architecture" support to web page.
Security
Briefly, increases security by jailing 3rd party content and JS, a secure alternative to directly including of 3rd party
JS into page.
The scope insulation for DOM and CSS is done by WebComponet shadow dom, API for JS
are insulated by closure for global objects with wrappers limiting the dom access root
to component content. Similar approach is applied for url, storage, cookies, etc.
Use
- Add to project via npm, bower, or simply placing
embed-page.js
into project tree - Import into page/module either by ES6 import, simple SCRIPT tag, webcomponent
link rel="import"
, or AMD require - Develop your reusable widgets as insulated HTML and include into page by
<embed-page>
or
Add some useful 3rd party microapplication
into your page same way.
The content could be set either by src attribute or by Polymer {{data}} binding of content;
including the insulated content in TEMPLATE; or binding content via html attribute.
<embed-page src="abc.html" ></embed-page>
<embed-page src="demo-menu.html" scope="none" ></embed-page>
<embed-page>
<template>
<style>h1{color:chocolate;}</style>
<h1> In chocolate only itself, no fumes spread. </h1>
<template>
</embed-page>
<iron-ajax last-response="{{htmlContent}}" url="abc.html" auto ></iron-ajax>
<embed-page html="[[htmlContent]]"></embed-page>
At the moment <embed-page>
resides in Polymer echosystem, file the
change request if need other or no framework compatibility.
Dependencies
Polymer 3 Element is a base for embed-page. No other dependencies in run time planned before first release
( currently project is in pre-release alpha stage). Polymer Paper Elements and Vaadin are used for demo and
are not required to use <embed-page/>
To see in action
See the live basic DEMO on webcomponents.org
, or locally run
$ polymer serve --open
It will open the demo page in browser.
In demo the external page is loaded into shadow dom and its embedded and referenced JS
will work with document via wrapper in same way as standalone page.
The host page document is not available from embedded content, which is validated by using
same DOM selectors as in host page as in instances of <embed-page>
.
Project
Install the Polymer-CLI
First, make sure you have the Polymer CLI
and npm (packaged with Node.js) installed.
Run npm install
to install your element's dependencies, then run polymer serve
to serve your element locally.
Viewing Your Element
$ polymer serve
Running Tests
$ polymer test
Your application is already set up to be tested via web-component-tester. Run polymer test
to run your application's test suite locally.