網頁輸入頁面Enter鍵處理元件(KeyDownProcess Version:1.5)

##修正無法自動對焦的問題
##於asp.net detail view使用時，編輯區的元件須設定ID
function KeyDownProcess(e) {
    //-----------------------------------------------------------
    //網頁親和性輸入控制元件
    //元件功能：可以讓網頁資料的輸入更親切，功能如下：
    //1.按下Enter鍵自動找到下一個可輸入輸入元件
    //2.按下Enter鍵自動找尋submit按鍵，如果找到則模擬Click的功能
    //3.當輸入元件設定唯讀時，按下backspace鍵時，防止網頁轉址
    //4.支援無障礙導覽設定
    //5.支援Firefox、Google Chrome瀏覽器
    //版本：1.5(2012.06.02)
    //作者：科碩資訊有限公司
    //引用本元件，請保留作者和版本資訊
    //連絡mail:cursor@cursorinfo.com.tw
    //------------------------------------------------------------
    w3cEvent = e;
    var kv = 0;
    var rv = false;
    var isTextarea = false;
    var currentId = null; //目前元件
    var ex;
    var isAll = typeof (document.all) == "object";
    if (isAll) {
        ex = event;
        kv = ex.keyCode;
        isTextarea = (ex.srcElement.tagName == "TEXTAREA");
        currentId = ex.srcElement.id;
    }
    else {
        ex = e;
        kv = ex.which * 1;
        isTextarea = (ex.target == "[object HTMLTextAreaElement]");
        currentId = ex.target.id;
    }
    switch (kv) {
        case 13:
            if (isAll) {
                if (ex.srcElement.tagName == "A" || (ex.srcElement.tagName == "INPUT" && ex.srcElement.type == "BUTTON"))
                    return true;
            }
            if (currentId.length == 0)
                return false;
            if (isTextarea == true) {
                rv = isTextarea;
            }
            else {
                var cts = isAll ? document.all : document.getElementsByTagName('*');
                var cid = "";
                var queryBu = null;
                var beginNext = false; //開始比對是否為輸入元件
                var nextInput = null; //下一個輸入元件
                var specialSubmitId = "textQueryBU"; //指定特例的submit id
                var exceptionSubmitId = "waitting"; //指定例外的submit Id
                for (ii = 0; ii < cts.length; ii++) {
                    if (cts[ii].type == null || cts[ii].id == null)
                        continue;
                    if (cts[ii].id == currentId) {
                        beginNext = true;
                        continue;
                    }
                    if (beginNext == true && (cts[ii].id.indexOf(specialSubmitId) > -1 || ((cts[ii].type == "submit" || cts[ii].type == "image") && cts[ii].id.indexOf(exceptionSubmitId) == -1))) {
                        queryBu = cts[ii]; //找到submit元件
                        break;
                    }
                    else if (beginNext == true && (cts[ii].type == "text" || cts[ii].type == "textarea" || cts[ii].type == "password") && cts[ii].readOnly == false && cts[ii].style.display != "none") {
                        nextInput = cts[ii]; //找到下一個文字輸入元件
                        break;
                    }
                }
                if (null != queryBu) {
                    setTimeout("doClickId('" + queryBu.id + "');", 100);
                    rv = false;
                }
                else if (null != nextInput && nextInput.offsetWidth != 0) {
                    try {
                        nextInput.focus();
                    } catch (Error) { return true; }
                    rv = false;
                }
            }
            break;
        default:
            rv = true;
            break;
    }
    return rv;
}
//實做模擬Click的功能
function doClickId(source) {
    var o = document.getElementById(source);
    if (document.all && typeof (document.all) == "object") //IE
        o.click();
    else {
        if (document.createEvent) {
            var e = document.createEvent('MouseEvent');
            e.initEvent('click', true, false);
            o.dispatchEvent(e);
        } else {
            o.fireEvent('onclick');
        }
    }
}