網頁輸入頁面Enter鍵處理元件(KeyDownProcess Version:1.4)

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：1.4(2011.06.28)
//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
//------------------------------------------------------------
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 8:
if (currentId.length == 0)
return false;
return !document.getElementById(currentId).readOnly;
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) {
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 {
var e = document.createEvent('mouseEvent');
e.initEvent('click', true, true);
o.dispatchEvent(e);
}
}