Open source, web-based math editor

Question

I'm looking for an open source library of a math equation editor. I want to embed this math editor in my website. I want to have a text box (a textarea) that gives the ability to the user to insert math equations with a list of math symbols buttons. Preferably, the output does not have to be visually equivalent to LaTeX nor real time because I want to save all the input of the user and output it as a pdf document. If anyone can guide me to such a open source program I would be grateful.

Answer 1

http://www.codecogs.com/eqneditor对我来说效果很好，并且是可嵌入的。