react.js textarea that updates via a web service

editor.js

var Editor = React.createClass({
    	getInitialState: function() {
    		return {value: 'Hello!'};
    	},
    	handleChange: function(event) {
    		var caretPos = this.getDOMNode().selectionStart;
    		var msg = {text:event.target.value,caret:caretPos};
    		$.ajax({url: "/text", type: "POST",
    			data: JSON.stringify(msg),
                contentType:"application/json; charset=utf-8", dataType:"json",
                success : function(response){
                	 this.setState({value: response.text});  
                	 this.getDOMNode().setSelectionRange(response.caret,response.caret);
                 }.bind(this)});
    	},
    	render: function() {
    		var value = this.state.value;
    		return <textarea type="text" value={value} 
                                  onChange={this.handleChange} 
                                  rows="10" cols="60"/>;
    	}
    });