How to use events is jquery plugin?

Sorry this is my first time trying to create a plugin, so I might be way off. I have read the docs but got confused, and I decided to learn by trying....

I am trying to make a simple form validation plugin

(function($){
    $.fn.bluevalidate = function(options){

        var defaults = {
            errorMsg : 'You have an error',
            required : ''
        };

        var opt = $.extend(defaults,options);

        return this.each(function(index,element){
           var e = $(element);

           if(opt.required!='')
           {
                e.bind('blur',function(){
                    alert("required is here");
                });
           }
           else
           {
                alert("NOOOOOOOOO");
           }
        });
    };

})( jQuery )

And I am calling it like

$('#username').bluevali开发者_开发技巧date({
     required:'This field is required';
})

I want to get the alert when the user clicks off the field, but as you can guess, my method isn't working, please tell me what I am doing wrong....

There's an extra ; in there, it should be:

$('#username').bluevalidate({
  required:'This field is required'
})

When declaring an object literal, your properties should not be followed by a ; (you should however have a , between properties). This is the main issue:

  required:'This field is required'; //the ; shouldn't be here

You can test it out here.