Hold changes in JSON

Really need help/advice with this aspect of my project. My ultimate goal is to capture the changes made by a user and once they select confirm, post it to SQL for updating. I will use AJAX and PHP for the latter part of the project but I thought JSON would be a great idea to hold all the changes made by a user. I am new to JSON and im having trouble with getting the results to be one large object that when the user selects "ok", will transfer to the server.

Question:
Can someone help me with the coding of this? Is JSON the best way to accomplish the goal?

Heres what i have so far(modified of course. Focus on functionality):

submit







function addDeskId(e){
    $adjustment;
    userObject = $(this); 
    userObjectChange = 'CHANGE_SEAT_TO'; //This is what i will use with AJAX and PHP to determine the SQL statement
    userObjectID = userObject.attr('data-info'); //This is the unique SQL ID for the object being modified
    userObjectDeskID = userObject.attr('data-id'); //This is the attribute for the object being modified
    userObjectSeatID = 9-4; //This is what the attribute is being modified to, for the question, ill make it a solid value
    var addUserObject = new jsonAddTest(userObjectID, userObjectChange, userObjectDeskID, userObjectSeatID,);

    //this is what the function is actually doing on the user side
    //$dragObject.attr("data-id",newSeat); //change desk number for new user location
    //$dragObject.attr("previousseat", "T");
    //var extPass = e;
    //moveOrSetupAccountLog(extPass);

}
function remDeskId(){
    userObject = $dropObject.find('div.dragTest');
    userObjectChange = 'REMOVESEAT'; //This is what i will use with AJAX and PHP to determine the SQL statement
    userObjectID = userObject.attr('data-info'); //This is the unique SQL ID for the object being modified
    userObjectDeskID = userObject.attr('data-id'); //This is the attribute for the object being modified
    userObjectDeskIDVal = 0; //This is what the attribute is being modified to

    var remUserObject = new jsonRemTest(userObjectID, userObjectChange, userObjectDeskID, userObjectDeskIDVal);

    //this is what the function is actually doing on the user side
    //userObject.attr({"data-id":""}); //remove desk number for new user location
    //userObject.appendTo('#userPool');



}

    //JSON functions test
function jsonRemTest(id, change, name, seat, value){
    this.ID = id;
    this.ChangeType = change;
    this.Name = name;
    this.Seat = seat;
    this.setTo = value;

            userMoves.push(jsonRemTest);

}
function jsonAddTest(id, change, name, desk, seat, previousseat, previousseatnewvalue){
    this.ID = id;
    this.ChangeType = change;
    this.Name = name;
    this.Seat = desk;
    this.setTo = seat;
    this.PreviousSeatValue = previousseat;
    this.PreviousSeatNewValue = previousseatnewvalue;

            userMoves.push(jsonAddTest);

}
console.log(JSON.stringify(userMoves));

I am getting the error, userMoves is undefined. I understand why this is happening but I dont know how to correct it.

So to wrap up my question and assistance:

Every time the user clicks on this button, it generates an array. I want to combine all the arrays into one object that contains all of them. When the user clicks on a submit button, the object is sent to the server using AJAX/PHP. Is this the best way to do this and if so, how do i combine the output of the JSON functions into one object to prep for sending?

Thanks in advance