[Solved] How to intergate web application like Google Calendar?

Since this question can’t be closed because there is a bounty on it, I’ll add an answer to it:

What you are looking for is called an “embeddable widget”.

The idea is that you provide your end user (developer/webmaster) with a piece of javascript that will:

• If needed pull in more javascript from your server.
• Append a bunch of HTML that contains your widget into the place where it was droppeded in.
• Speak with your server through either ajax or other ways.

Here are a couple of resources for you to read:

• http://codeutopia.net/blog/2012/05/26/best-practices-for-building-embeddable-widgets/
• http://prettyprint.me/prettyprint.me/2009/05/30/widgets-iframe-vs-inline/
• http://iframely.com/docs/iframelyjs – iframe widget lib (never tried)