ExtJS Create a component like editor of stackoverflow

I want to create a component on 开发者_开发知识库ExtJS like the editor that have stackoverflow for ask question (only Bold and Emphasis buttons). I think that should be an extension of textarea but i dont know how to select text selected and how to replace with tags+text. Please give me some ideas.

Thanks

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Markdown by John Gruber can be obtained from his site. You could use his documentation as a basis for creating your own plugin for the HtmlEditor.

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If you're talking about the ability to use asterisks for bullets and such, in that mode StackOverflow's editor uses something called "Markdown".

Here's one example of someone trying to make a markdown-based textarea with preview in Extjs:

http://www.sencha.com/learn/Extension:Ext.ux.MarkdownEditor

If you look around for other Markdown-related editors, you might find some ideas. If you're instead looking for just an "Online Rich-Text Editor" there's plenty of those.

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UPDATE 29-APR-2014: There's actually a project you should take a look at. It's called "StackEdit":

https://stackedit.io

It's an open source initiative to supply a markdown editing component. Not ExtJS based, but those who find this question may be interested in what they are doing it.

(I discovered it through one of SO's open-source-recruiting sidebar campaigns; advertising can be useful, apparently.)