Developing an editor from scratch + JavaScript + ajax [closed]

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I want to develop an editor,similar to HTML editor, in Ajax, JavaScript from scratch. I have done a lot of research but could not find any tutorial for the same.

1. Could you please guide me on how to start - any tutorials.
2. Which tool to use to develop - netbeans or eclipse, etc.

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If you mean a WYSIWYG editor, the best thing I can point you to is the Closure Library editor which Google uses for both the Gmail editor and the Google Docs editor.

You can find the rationale and reasoning behind it in Chapter 9 of Closure: The Definitive Guide by Michael Bolin. I couldn't find any free resources, but you can try just reading the code which is pretty well documented (but only if you are familiar with Javadoc, otherwise get the book). Once you learn how their editor works, I think it'll much easier for you to write your own from scratch.