Listing of Actions.js
//------------------------------------------------------------------
//  Actions: when user does something
//------------------------------------------------------------------

//------------------------------------------------------------------
//  Help
//------------------------------------------------------------------
function doHelp() {
    printHelp();
}

function doCloseHelp() {
    printPeople();
}

//------------------------------------------------------------------
//  Edit: new person
//------------------------------------------------------------------
var editIndex = -1;

function doAdd() {
    editError = "";
    editName = "";
    editBirthdate = "";
    editPictureURL = "";
    editAgeFormat = 0;
    editIndex = -1;         // signal adding someone
    printEdit();
}

//------------------------------------------------------------------
//  Edit: current person
//------------------------------------------------------------------
function doEdit(index) {
    editError = "";
    editName = people.array[index].name;
    editBirthdate = people.array[index].birthdate;
    editPictureURL = people.array[index].pictureURL;
    editAgeFormat = people.array[index].ageFormat;
    editIndex = index;
    printEdit();
}

function doSave() {
    if (!editOn)
        return;
        
    if (!checkEdits()) {
        printEdit();
        return;
    }
    
    //------------------------------------------------------------------
    //  data is ok. Suppress further editing
    //------------------------------------------------------------------
    editOn = false;
    
    if (editIndex == -1) {
        editIndex = people.array.length;        // index of new position
        people.array.length ++;
    }
    people.array[editIndex] = {
        "name" : editName,
        "birthdate" : editBirthdate,
        "pictureURL" : editPictureURL,
        "ageFormat" : editAgeFormat
    };
    printPeople();
    savePeople();
}

function doCancel() {
    printPeople();
}

//------------------------------------------------------------------
//  Save edits, check for errors
//------------------------------------------------------------------
function checkEdits() {
    editName        = _trim(_gel("name").value);
    editBirthdate   = _trim(_gel("birthdate").value);
    editPictureURL  = _trim(_gel("pictureURL").value);
    editAgeFormat   = parseInt(_gel("ageFormat").value);
    
    editError = "";
    if (editName == "") {
        editError += "The name cannot be blank. "
    }
    editError += checkDate(editBirthdate);
    if (editError != "") {
        editError = "<p>" + editError + "</p>";
        return false;
    } else {
        return true;
    }
}

//------------------------------------------------------------------
//  Check for a valid date
//------------------------------------------------------------------
function checkDate(dateString) {
    var error = "Please enter dates as mm/dd/yyyy, with yyyy = 100 to 9999. ";

    //------------------------------------------------------------------
    //  first some basic checks on the string
    //------------------------------------------------------------------
    var dateSep = dateString.split("/");
    if (dateSep.length != 3 ||
        dateSep[0] < 1 || dateSep[0] > 12 ||
        dateSep[1] < 1 || dateSep[1] > 31 ||
        dateSep[2] < 100 || dateSep[2] > 9999) {
        return error;
    }
    
    //------------------------------------------------------------------
    //  the acid test is the conversion to date format
    //------------------------------------------------------------------
    var d = new Date(dateString);
    var today = new Date();
    if (d > today) {
        return "Hey, that's in the future!";
    }
    if (isNaN(d.getMonth()) || isNaN(d.getDate()) || isNaN(d.getFullYear())) {
        return error;
    }
    
    return "";
}

//------------------------------------------------------------------
//  Delete a person
//------------------------------------------------------------------
function doDelete(index) {
    people.array.splice(index, 1);
    printPeople();
    savePeople();
}

//------------------------------------------------------------------
//  Check for enter key on text field
//------------------------------------------------------------------
function checkEnter(e) {
    if (!editOn) 
        return;
        
    var characterCode;
    if (e && e.which) {
        characterCode = e.which;
    } else {
        try {
            characterCode = event.keyCode;
        } catch (x) {
            characterCode = 0;
        }
    }
    if (characterCode == 13)
        doSave();
}