jQuery MinTip: minimal tooltips

jQuery.mintip.js

/*jslint vars: true, unparam: true, browser: true, white: true */
/*global jQuery */
(function ($) {
    "use strict";
    var onEnter, onLeave, startTimer, stopTimer, remove, getPos;
    var defaults = {
        delay: 500,
        content: null,
        allowHTML: false // XXX: rename
    };
    $.fn.mintip = function (options) {
        options = $.extend({}, defaults, options);
        var tips = this.map(function (i, node) {
            var origin = $(node);
            var tip = $('<div class="mintip" />');
            var content = options.content || origin.data("tooltip"); // XXX: precedence?
            var method = options.allowHTML ? "html" : "text";
            tip[method](content);
            tip.data("delay", options.delay);
            origin.data("mintip", tip);
            return tip[0];
        });
        //this.live("mouseenter", onEnter).live("mouseleave", onLeave); // XXX: `live` appropriate? - no, deprecated.

        $(document).on('mouseenter', this, function () {
            onEnter
        }).on('mouseleave', this, function () {
            onLeave
        });

        $(tips).mouseenter(stopTimer).mouseleave(onLeave); // XXX: regular bind inefficient?
    };
    onEnter = function (ev) {
        var origin = $(this);
        var tip = origin.data("mintip");
        stopTimer(tip);
        var pos = $.extend({
            position: "absolute"
        }, getPos(origin));
        tip.removeAttr("style").css(pos).appendTo(document.body);
        var rightEdge = tip.offset().left + tip.outerWidth(true);
        if (rightEdge >= $(document).width()) {
            delete pos.left;
            pos.right = 0;
            tip.removeAttr("style").css(pos);
        }
    };
    // NB: magically handles both origins' and tooltips' event
    onLeave = function (ev) {
        var node = $(this);
        var tip = node.data("mintip") || node;
        startTimer(tip);
    };
    startTimer = function (el) {
        var delay = el.data("delay");
        var timer = setTimeout(remove(el), delay);
        el.data("timer", timer);
    };
    // NB: can also be used as event handler
    stopTimer = function (el) {
        el = el.originalEvent ? $(this) : el; // event handler overloading
        var timer = el.data("timer");
        clearTimeout(timer);
        el.removeData("timer");
    };
    // proxy for deferred removal
    remove = function (el) {
        return function (timeoutID) { // NB: timeoutID must not be passed on
            el.detach(); // needs to retain attached delay data
        };
    };
    // determine tooltip position based on origin
    getPos = function (el) {
        var pos = el.offset();
        pos.top += el.height();
        pos.left += el.width() / 2;
        return pos;
    };
}(jQuery));