Mini-ajax library from: https://code.google.com/p/miniajax/

README.md

ajax.x - The XMLHttpRequest object (or MS equivalent) used for communication

ajax.serialize(f) f = the form element you wish to be serialized This function serializes all the fields in a form so that they can be passed as a query string in the form 'arg1=val1&arg2=val2'.

ajax.get(url, func) url = the url to query (can contain arguments after a '?') func = the function to call once the response is returned This function uses a GET request to query the specified url and return a response to the specified function.

ajax.gets(url) url = the url to query (can contain arguments after a '?') This function uses a GET request to query the specified url and return a response synchronously. Use this sparingly, as synchronous calls can lock up the browser.

ajax.post(url, func, args) url = the url to query func = the function to call once the response is returned args = a string containing arguments to be passed to the url This function uses a POST request to query the specified url and return a response to the specified function.

ajax.update(url, elm) url = the url to query elm = the (name of the) element to update This function uses a GET request to query the specified url and insert the result into the specified element.

ajax.submit(url, elm, frm) url = the url to query elm = the (name of the) element to update frm = the form element to submit This function is typically used in the onsubmit handler of a function. The form is not submitted the usual way; the form is instead serialized using 'ajax.serialize' and submitted using 'ajax.post'. The result is then inserted into the specified element.

mini-ajax.js

function $(e) {
    if (typeof e == 'string') e = document.getElementById(e);
    return e
};

function collect(a, f) {
    var n = [];
    for (var i = 0; i < a.length; i++) {
        var v = f(a[i]);
        if (v != null) n.push(v)
    }
    return n
};

ajax = {};
ajax.x = function () {
    try {
        return new ActiveXObject('Msxml2.XMLHTTP')
    } catch (e) {
        try {
            return new ActiveXObject('Microsoft.XMLHTTP')
        } catch (e) {
            return new XMLHttpRequest()
        }
    }
};
ajax.serialize = function (f) {
    var g = function (n) {
        return f.getElementsByTagName(n)
    };
    var nv = function (e) {
        if (e.name) return encodeURIComponent(e.name) + '=' + encodeURIComponent(e.value);
        else return ''
    };
    var i = collect(g('input'), function (i) {
        if ((i.type != 'radio' && i.type != 'checkbox') || i.checked) return nv(i)
    });
    var s = collect(g('select'), nv);
    var t = collect(g('textarea'), nv);
    return i.concat(s).concat(t).join('&');
};
ajax.send = function (u, f, m, a) {
    var x = ajax.x();
    x.open(m, u, true);
    x.onreadystatechange = function () {
        if (x.readyState == 4) f(x.responseText)
    };
    if (m == 'POST') x.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
    x.send(a)
};
ajax.get = function (url, func) {
    ajax.send(url, func, 'GET')
};
ajax.gets = function (url) {
    var x = ajax.x();
    x.open('GET', url, false);
    x.send(null);
    return x.responseText
};
ajax.post = function (url, func, args) {
    ajax.send(url, func, 'POST', args)
};
ajax.update = function (url, elm) {
    var e = $(elm);
    var f = function (r) {
        e.innerHTML = r
    };
    ajax.get(url, f)
};
ajax.submit = function (url, elm, frm) {
    var e = $(elm);
    var f = function (r) {
        e.innerHTML = r
    };
    ajax.post(url, f, ajax.serialize(frm))
};