jQuery Client-Side Text Input Previews: Parsing

For the sake of learning more about jQuery, I was wondering if anyone could show me how to make a reaaallly simple parser in jQuery. All I would want the parser to do is take a post from a user and wherever the user has input a line break, make paragraphs.

Example: The user types two lines of a message:

 This is the first line.

 This is the second line.

What I would want out:

 <p>This is the first line.</p>

 <p>This is the second line.</p>

Let's say I define the parser as simpleParser (which currently doesn't alter the text):

 function simpleParser(text_input) {
      return text_input
 }

And it's called as such:

 $('.textarea').bind('keyup', function() {
    var post = $(this).val()
    $('#textarea .preview').html(textileParser(post));
});

I know that I can rely o开发者_Python百科n premade WYSIWYG and other editors that others have created, but as an experiment in learning more jQuery, can anyone help me out or point me in the right direction?

---

Try this:

function parseText(str){
    return "<p>" + str.split("\n").join("</p><p>") + "</p>";
}

here's a jsfiddle: http://jsfiddle.net/QKf3q/1/