Here is a jQuery plugin you can give a try.
A small cross-browser JavaScript library for obtaining and manipulating selections within and HTML elements.
http://code.google.com/p/rangyinputs/
http://stackoverflow.com/questions/11296537/moving-cursor-position-in-contenteditable-div

jquery - Plugin to handle selection? - Stack Overflow Rangyinputs A jquery plugin that offers similar functionality as Rangy, except for inputs instead of arbitrairy DOM elements. A small cross-browser ...stackoverflow.com/ques... 2012-02-20  - 百度快照 - 88%好评 - 翻译此页javascript - selectionStart-End with textareas - Stack Overflow Another plug-in you could use, and the only one I'm aware of that correctly handles line breaks in IE, is my own Rangy Inputs plugin. share|...stackoverflow.com/ques... 2013-08-09  - 百度快照 - 88%好评 - 翻译此页upload | jQuery Plugin RegistryjQuery: The Write Less, Do More, JavaScript Library... Rangy Inputs (version 1.1.3-3) jGallery - FREE jQuery photo gallery and slider with albums ...plugins.jquery.com/tag... 2014-03-27  - 百度快照 - 评价 - 翻译此页javascript - Get the offset position of the caret in a ... Here's an approach using rangyinputs, rangy and jQuery. It basically copies the whole text from inside the textarea into a div of the same size. I...stackoverflow.com/ques... 2013-05-27  - 百度快照 - 88%好评 - 翻译此页

控制文本框與控制可編輯div的光標是不同的。