get error from bind event in Backbone Validation and Reactjs Component?

i have some problems with Backbone.Validation library, as you know model.bind("validated", function(...) ). i have that one in method of Reactjs Component. You can see the code as below, i would like to set the eMsg global var but when it outside of user.bind or user.on, eMsg var is not assign.



How can i get error from user.bind or user.on to outside of the statement ? Thanks.

    handleSubmit : function() {
        var self = this;
        var user = new global.Models.RegisterModel(this.state.model, {validate:true});
        var flag = false;
        var eMsg = null;
        ********* (First Testing) ************
        /*user.bind("validated", function(isValid, model, error) {
            if(!isValid){
                for (var k in error) {
                    eMsg += ", " + error[k];
                }
            }else{
                flag = true;
            }
        });*/
        ********* (Sencod Testing) ************
        if( user.isValid() ){
            console.log("success")
            this.setState({msg : "success"})
        }else{
            console.log("error")
            user.on("invalid", function(model, error) {
                console.log("invalid")
                console.log(error);
            })
            this.setState({msg : eMsg})
        }

    }