クロスブラウザライブラリ - DXBL

<!--[if IE]>
<script type="text/javascript" src="dxbl.js"></script>
<![endif]-->

/*  DXBL - Diaspar Cross Browser Layer, version 0.4.1
 *  http://diaspar.jp/node/51
 *  2007-02-23
 */

var DXBL    = {}        // for Diaspar Cross Browser Layer
DXBL.ie     = {}        // for Internet Explorer
DXBL.ie.w3c = {}        // W3C 互換メソッドの定義

DXBL.ie.w3c.addEventListener = function(elm, lsns) {
    return function(type, listener, useCapture) {
        if (useCapture) { return; }
        var wrapper = function(evt) {
            DXBL.ie.event(evt, elm);
            listener(evt);
        }
        lsns.push({ type: type, listener: listener, wrapper: wrapper});
        elm.attachEvent("on" + type, wrapper);
    }
}

DXBL.ie.w3c.createEvent = function() {
    return function(eventType) {
        var evt = document.createEventObject();
        evt.initMouseEvent = function(type) {
            this.type = type;
        }
        return evt;
    }
}

DXBL.ie.w3c.dispatchEvent = function(elm) {
    return function(evt) {
        elm.fireEvent("on" + evt.type);
    }
}

DXBL.ie.w3c.getElementById = function() {
    var orgmethod = document.getElementById;
    return function(id) {
        return DXBL.ie.element(orgmethod(id));
    }
}

DXBL.ie.w3c.getElementsByTagName = function(elm) {
    var orgmethod = elm.getElementsByTagName;
    return function(tagname) {
        var elms = orgmethod(tagname);
        for (var i = 0; i < elms.length; ++i) {
            if (elms[i].id || elms[i].className) {
                DXBL.ie.element(elms[i]);
            }
        }
        return elms;
    }
}

DXBL.ie.w3c.removeEventListener = function(elm, lsns) {
    return function(type, listener, useCapture) {
        if (useCapture) { return; }
        for (var i in lsns) {
            if (lsns[i].type == type && lsns[i].listener == listener) {
                elm.detachEvent("on" + lsns[i].type, lsns[i].wrapper);
                lsns.splice(i, 1);
                break;
            }
        }
    }
}

DXBL.ie.w3c.XMLHttpRequest = function() {
    try {
        new ActiveXObject("Msxml2.XMLHTTP");
        return function() {
            return new ActiveXObject("Msxml2.XMLHTTP");
        }
    }
    catch (e) {
        try {
            new ActiveXObject("Microsoft.XMLHTTP");
            return function() {
                return new ActiveXObject("Microsoft.XMLHTTP");
            }
        }
        catch (e) {
            throw e;
        }
    }
}

DXBL.ie.element = function(elm) {
    if (typeof elm.addEventListener == "function") {
        return elm;     // 処理済み
    }
    var listeners = [];
    elm.addEventListener     = DXBL.ie.w3c.addEventListener(elm, listeners);
    elm.dispatchEvent        = DXBL.ie.w3c.dispatchEvent(elm);
    elm.getElementsByTagName = DXBL.ie.w3c.getElementsByTagName(elm);
    elm.removeEventListener  = DXBL.ie.w3c.removeEventListener(elm, listeners);
    elm.attachEvent("onpropertychange", DXBL.ie.property);
    return elm;
}

DXBL.ie.event = function(evt, elm) {
    evt.target          = evt.srcElement;
    evt.currentTarget   = elm;
    evt.preventDefault  = function() { evt.returnValue = false; }
    evt.stopPropagation = function() { evt.cancelBubble = true; }
}

DXBL.ie.property = function(evt) {
    var elm = evt.srcElement;
    switch (evt.propertyName) {
    case "style.opacity":
        var value = elm.style.opacity;
        elm.style.filter = "Alpha(opacity=" + (value * 100) + ")";
        break;
    default:
        break;
    }
}

DXBL.ie.element(window);

window.onload = function() {
    if (typeof window.XMLHttpRequest == "undefined") {          // IE6
        window.XMLHttpRequest = DXBL.ie.w3c.XMLHttpRequest();
    }
    DXBL.ie.element(document);
    document.createEvent    = DXBL.ie.w3c.createEvent();
    document.getElementById = DXBL.ie.w3c.getElementById();
    document.getElementsByTagName("*");     // ページが構築されてから実行
}