// Chained Selects
// Copyright Xin Yang 2004
// Web Site: www.yxScripts.com
// EMail: m_yangxin@hotmail.com
// Last Updated: 2004-10-14
// This script is free as long as the copyright notice remains intact.
var _disable_empty_list=false;
var _hide_empty_list=false;
// ------
if (typeof(disable_empty_list)=="undefined") { disable_empty_list=_disable_empty_list; }
if (typeof(hide_empty_list)=="undefined") { hide_empty_list=_hide_empty_list; }
var cs_goodContent=true, cs_M="M", cs_L="L", cs_curTop=null, cs_curSub=null;
function cs_findOBJ(obj,n) {
for (var i=0; i<obj.length; i++) {
if (obj[i].name==n) { return obj[i]; }
}
return null;
}
function cs_findContent(n) { return cs_findOBJ(cs_content,n); }
function cs_findM(m,n) {
if (m.name==n) { return m; }
var sm=null;
for (var i=0; i<m.items.length; i++) {
if (m.items[i].type==cs_M) {
sm=cs_findM(m.items[i],n);
if (sm!=null) { break; }
}
}
return sm;
}
function cs_findMenu(n) { return (cs_curSub!=null && cs_curSub.name==n)?cs_curSub:cs_findM(cs_curTop,n); }
function cs_contentOBJ(n,obj){
this.name=n;
this.menu=obj;
this.lists=new Array();
this.cookie="";
this.callback=null;
this.count=1;
}; cs_content=new Array();
function cs_topmenuOBJ(tm) {
this.name=tm;
this.items=new Array();
this.df=",";
this.addM=cs_addM; this.addL=cs_addL;
}
function cs_submenuOBJ(dis,link,sub) {
this.name=sub;
this.type=cs_M;
this.dis=dis;
this.link=link;
this.df=",";
var x=cs_findMenu(sub);
this.items=x==null?new Array():x.items;
this.addM=cs_addM; this.addL=cs_addL;
}
function cs_linkOBJ(dis,link) {
this.type=cs_L;
this.dis=dis;
this.link=link;
}
function cs_addM(dis,link,sub) { this.items[this.items.length]=new cs_submenuOBJ(dis,link,sub); }
function cs_addL(dis,link) { this.items[this.items.length]=new cs_linkOBJ(dis,link); }
function cs_showMsg(msg) { window.status=msg; }
function cs_badContent(n) { cs_goodContent=false; cs_showMsg("["+n+"] Not Found."); }
function _setCookie(name, value) {
document.cookie=name+"="+value;
}
function cs_setCookie(name, value) {
setTimeout("_setCookie('"+name+"','"+value+"')",0);
}
function cs_getCookie(name) {
var cookieRE=new RegExp(name+"=([^;]+)");
if (document.cookie.search(cookieRE)!=-1) {
return RegExp.$1;
}
else {
return "";
}
}
function cs_optionOBJ(text,value) { this.text=text; this.value=value; }
function cs_getOptions(menu) {
var opt=new Array();
for (var i=0; i<menu.items.length; i++) {
opt[i]=new cs_optionOBJ(menu.items[i].dis, menu.items[i].link);
}
return opt;
}
function cs_emptyList(list) {
for (var i=list.options.length-1; i>=0; i--) {
list.options[i]=null;
}
}
function cs_refreshList(list,opt,df,key) {
var l=list.options.length;
for (var i=0; i<opt.length; i++) {
list.options[l+i]=new Option(opt[i].text, opt[i].value, df.indexOf(","+i+",")!=-1, df.indexOf(","+i+",")!=-1);
list.options[l+i].idx=i;
list.options[l+i].key=key;
}
}
function cs_getList(content,key) {
var menu=content.menu;
if (key!="[]") {
var paths=key.substring(1,key.length-1).split(",");
for (var i=0; i<paths.length; i++) {
menu=menu.items[parseInt(paths[i],10)];
}
}
return menu;
}
function cs_getKey(key,idx) {
return "["+(key=="[]"?"":(key.substring(1,key.length-1)+","))+idx+"]";
}
function cs_getSelected(mode,name,idx,key,df) {
if (mode) {
var cookies=cs_getCookie(name+"_"+idx);
if (cookies!="") {
var mc=cookies.split("-");
for (var i=0; i<mc.length; i++) {
if (mc[i].indexOf(key)!=-1) {
df=mc[i].substring(key.length);
break;
}
}
}
}
return df;
}
function cs_updateListGroup(content,idx,mode) {
var menu=null, options=content.lists[idx].options, has_sublist=false;
var key="", option=",", cookies="";
if (options.selectedIndex<0) {
options.selectedIndex=0;
}
for (var i=0; i<options.length; i++) {
if (options[i].selected) {
if (key!=options[i].key) {
cookies+=key==""?"":((cookies==""?"":"-")+key+option);
key=options[i].key;
option=",";
menu=cs_getList(content,key);
}
option+=options[i].idx+",";
if (idx+1<content.lists.length) {
if (menu.items[options[i].idx].type==cs_M) {
if (!has_sublist) {
has_sublist=true;
cs_emptyList(content.lists[idx+1]);
}
var subkey=cs_getKey(key,options[i].idx), df=cs_getSelected(mode,content.cookie,idx+1,subkey,menu.items[options[i].idx].df);
cs_refreshList(content.lists[idx+1],cs_getOptions(menu.items[options[i].idx]),df,subkey);
}
}
}
}
if (key!="") {
cookies+=(cookies==""?"":"-")+key+option;
}
if (content.cookie) {
cs_setCookie(content.cookie+"_"+idx,cookies);
}
if (has_sublist && idx+1<content.lists.length) {
if (disable_empty_list) {
content.lists[idx+1].disabled=false;
}
if (hide_empty_list) {
content.lists[idx+1].style.display="";
}
cs_updateListGroup(content,idx+1,mode);
}
else {
for (var s=idx+1; s<content.lists.length; s++) {
cs_emptyList(content.lists[s]);
if (disable_empty_list) {
content.lists[s].disabled=true;
}
if (hide_empty_list) {
content.lists[s].style.display="none";
}
if (content.cookie) {
cs_setCookie(content.cookie+"_"+s,"");
}
}
}
}
function cs_initListGroup(content,mode) {
var key="[]", df=cs_getSelected(mode,content.cookie,0,key,content.menu.df);
cs_emptyList(content.lists[0]);
cs_refreshList(content.lists[0],cs_getOptions(content.menu),df,key);
cs_updateListGroup(content,0,mode);
}
function cs_updateList() {
var content=this.content;
for (var i=0; i<content.lists.length; i++) {
if (content.lists[i]==this) {
cs_updateListGroup(content,i,content.cookie);
if (content.callback) {
content.callback(this,i+1,content.count);
}
break;
}
}
}
// ----
function addListGroup(n,tm) {
if (cs_goodContent) {
cs_curTop=new cs_topmenuOBJ(tm); cs_curSub=null;
var c=cs_findContent(n);
if (c==null) {
cs_content[cs_content.length]=new cs_contentOBJ(n,cs_curTop);
}
else {
delete(c.menu); c.menu=cs_curTop;
}
}
}
function addList(n,dis,link,sub,df) {
if (cs_goodContent) {
cs_curSub=cs_findMenu(n);
if (cs_curSub!=null) {
cs_curSub.addM(dis,link||"",sub);
if (typeof(df)!="undefined") { cs_curSub.df+=(cs_curSub.items.length-1)+","; }
}
else {
cs_badContent(n);
}
}
}
function addOption(n,dis,link,df) {
if (cs_goodContent) {
cs_curSub=cs_findMenu(n);
if (cs_curSub!=null) {
cs_curSub.addL(dis,link||"");
if (typeof(df)!="undefined") { cs_curSub.df+=(cs_curSub.items.length-1)+","; }
}
else {
cs_badContent(n);
}
}
}
function initListGroup(n) {
var _content=cs_findContent(n), count=0;
if (_content!=null) {
content=new cs_contentOBJ("cs_"+_content.count+"_"+n,_content.menu);
content.count=_content.count++;
cs_content[cs_content.length]=content;
for (var i=1; i<initListGroup.arguments.length; i++) {
if (typeof(arguments[i])=="object" && arguments[i].tagName && arguments[i].tagName=="SELECT") {
content.lists[count]=arguments[i];
arguments[i].onchange=cs_updateList;
arguments[i].content=content; arguments[i].idx=count++;
}
else if (typeof(arguments[i])=="string" && /^[a-zA-Z_]\w*$/.test(arguments[i])) {
content.cookie=arguments[i];
}
else if (typeof(arguments[i])=="function") {
content.callback=arguments[i];
}
else {
cs_showMsg("Warning: Unexpected argument in initListGroup() for ["+n+"]");
}
}
if (content.lists.length>0) {
cs_initListGroup(content,content.cookie);
}
}
}
function resetListGroup(n,count) {
var content=cs_findContent("cs_"+(count||1)+"_"+n);
if (content!=null && content.lists.length>0) {
cs_initListGroup(content,"");
}
}
// ------