$(document).ready(function() {
    $("#demo").html("Hello World!");
});

function checkCreditLimit() {
    var i = 0;
    var totalcredits = parseInt('0');
    var courses = [];

    $('input[type=checkbox]:checked').map(function(_, el) {
        jQuery.ajax({
            type: "POST",
            url: 'coursecredits.php',
            dataType: 'json',
            async: false,
            data: {coursename: $(el).val()},
        
            success: function (obj, textstatus) {
                totalcredits += parseInt(obj);
                // alert(totalcredits);
            }
        });
        courses[i++] = $(el).val();
    }).get();
    
    if(totalcredits > 12) {
        alert("Cannot select more than 12 credits! Please reduce course(s).");
    } else {
        i = 0;
        var l = courses.length;
        while (i < l){
            // alert(courses[i]);
        jQuery.ajax({
            type: "POST",
            url: 'storeselection.php',
            dataType: 'json',
            data: {coursename: courses[i++]},
            success: function (obj, textstatus) {
                alert('Added preferences.');
            }
        });
        }
    }
}