How to add functions to some jQuery objects, but not others?

Question

Let\'s say I have a

list:

    ...

I want to select it with jQuery, then add s

Answer 1

I think you want to add a function to that DOM Object.

$(function(){
    // [0] gets the first object in array, which is your selected element, you can also use .get(0) in jQuery
    $("#test")[0].addProduct = function(info){
        alert("ID: " + this.id + " - Param: " + info);
    };


    $("#test")[0].addProduct("productid");
});

Above script wil alert "ID: test - Param: productid"

A live example: http://jsfiddle.net/jJ65A/1/

Or normal javascript

$(function(){
    document.getElementById("test").addProduct = function(info){
        alert(info);
    };
});