I want to build a chrome extension like rapportive.com. I'm new to Chrome extensions and Gmail Content Script. Can any one please suggest how to go about this?
Currently I'm reading Google's Gadget docs.
Here are some notes to get you started. There are more robust ways to build this, but this is the "hello world" of the functionality you are talking about:
The greatest long-term challenge you will face is that gmail's layout will change unexpectedly and break email discovery or the modified UI. Both issues either require some cleverness to solve, or will require you to stay up at night wondering whether Google will suddenly break your extension.
Good luck!
I don't know what google gadget is and link you provided gives 404 but I don't think you even need this.
What you need is a content script that is injected into gmail page where it adds a panel. So, start with reading about how to create a Chrome extension that is using content scripts.
There is a new SDK for modifying the DOM elements in gmail: https://www.inboxsdk.com/docs/
They have a useful API for adding buttons and other elements.
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