JavaScript

References

https://developer.mozilla.org/en-US/docs/JavaScript/Guide

Method - a function which is inside of a variable

Nameless / anonymous / lambda functions - functions which don't have a name but can be called.

document.getElementById('registration').onsubmit = function() {
    // do stuff;
    // return true to continue submission, false to stop
};

jQuery

$("#map-canvas") returns a jQuery object (with lots of functionality built in) $("#map-canvas").get(0) returns the actual underlying DOM node which jQuery is wrapping

Ajax example

function quote() {
    var url = "quote.php?symbol="  + $('#symbol').val();
    $.getJSON(url, function(data) {
        $('#price').html(data.price);
    });
}