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Chained Selects\n\n// Copyright Xin Yang 2004\n// Web Site: www.yxScripts.com\n// EMail: m_yangxin@hotmail.com\n// Last Updated: 2004-08-23\n\n// This script is free as long as the copyright notice remains intact.\n\nvar _disable_empty_list = false;\nvar _hide_empty_list = false;\n\n// ------\nif (typeof (disable_empty_list) == \"undefined\") { disable_empty_list = _disable_empty_list; }\nif (typeof (hide_empty_list) == \"undefined\") { hide_empty_list = _hide_empty_list; }\n\nvar cs_goodContent = true;\nvar cs_M = \"M\";\nvar cs_L = \"L\";\nvar cs_curTop = null;\nvar cs_curSub = null;\n\nfunction cs_findOBJ(obj, n) {\n    for (var i = 0; i < obj.length; i++) {\n        if (obj[i].name == n) { return obj[i]; }\n    }\n    return null;\n}\nfunction cs_findContent(n) { return cs_findOBJ(cs_content, n); }\n\nfunction cs_findM(m, n) {\n    if (m.name == n) {\n        return m;\n    }\n\n    var sm = null;\n    for (var i = 0; i < m.items.length; i++) {\n        if (m.items[i].type == cs_M) {\n            sm = cs_findM(m.items[i], n);\n            if (sm != null) {\n                break;\n            }\n        }\n    }\n    return sm;\n}\n\nfunction cs_findMenu(n) {\n    return (cs_curSub != null && cs_curSub.name == n)\n        ? cs_curSub\n        : cs_findM(cs_curTop, n);\n}\n\nfunction cs_contentOBJ(n, obj) {\n    this.name = n;\n    this.menu = obj;\n    this.lists = new Array();\n    this.cookie = \"\";\n};\n\ncs_content = new Array();\n\nfunction cs_topmenuOBJ(tm) {\n    this.name = tm;\n    this.items = new Array();\n    this.df = 0;\n    this.addM = cs_addM;\n    this.addL = cs_addL;\n}\n\nfunction cs_submenuOBJ(dis, link, sub) {\n    this.name = sub;\n    this.type = cs_M;\n    this.dis = dis;\n    this.link = link;\n    this.df = 0;\n\n    var x = cs_findMenu(sub);\n    this.items = x == null\n        ? new Array()\n        : x.items;\n\n    this.addM = cs_addM; this.addL = cs_addL;\n}\n\nfunction cs_linkOBJ(dis, link) {\n    this.type = cs_L;\n    this.dis = dis;\n    this.link = link;\n}\n\nfunction cs_addM(dis, link, sub) {\n    this.items[this.items.length] = new cs_submenuOBJ(dis, link, sub);\n}\n\nfunction cs_addL(dis, link) {\n    this.items[this.items.length] = new cs_linkOBJ(dis, link);\n}\n\nfunction cs_showMsg(msg) {\n    console.log(msg);\n}\n\nfunction cs_badContent(n) {\n    cs_showMsg(\"[\" + n + \"] Not Found.\");\n    //cs_goodContent = false;\n}\n\nfunction cs_optionOBJ(text, value) {\n    this.text = text;\n    this.value = value;\n}\n\nfunction cs_emptyList(list) {\n    for (var i = list.options.length - 1; i >= 0; i--) {\n        list.options[i] = null;\n    }\n}\n\nfunction cs_refreshList(list, opt, df) {\n    cs_emptyList(list);\n\n    for (var i = 0; i < opt.length; i++) {\n        list.options[i] = new Option(opt[i].text, opt[i].value);\n    }\n\n    if (opt.length > 0) {\n        list.selectedIndex = df;\n    }\n}\n\nfunction cs_getOptions(menu) {\n    var opt = new Array();\n    for (var i = 0; i < menu.items.length; i++) {\n        opt[i] = new cs_optionOBJ(menu.items[i].dis, menu.items[i].link);\n    }\n    return opt;\n}\n\nfunction cs_updateListGroup(content, idx, sidx, mode) {\n    var i = 0,\n        curItem = null,\n        menu = content.menu;\n\n    while (i < idx && menu.items && menu.items.length > 0) {\n        menu = menu.items[content.lists[i++].selectedIndex];\n    }\n\n    if (menu.items && menu.items[sidx] && menu.items[sidx].type == cs_M && idx < content.lists.length - 1) {\n        var df = cs_getIdx(mode, content.cookie, idx + 1, menu.items[sidx].df);\n\n        cs_refreshList(content.lists[idx + 1], cs_getOptions(menu.items[sidx]), df);\n        if (content.cookie) {\n            cs_setCookie(content.cookie + \"_\" + (idx + 1), df);\n        }\n\n        if (idx + 1 < content.lists.length) {\n            if (disable_empty_list) {\n                content.lists[idx + 1].disabled = false;\n            }\n            if (hide_empty_list) {\n                content.lists[idx + 1].style.display = \"\";\n            }\n\n            cs_updateListGroup(content, idx + 1, df, mode);\n        }\n    }\n    else {\n        for (var s = idx + 1; s < content.lists.length; s++) {\n            cs_emptyList(content.lists[s]);\n\n            if (disable_empty_list) {\n                content.lists[s].disabled = true;\n            }\n            \n            if (hide_empty_list) {\n                content.lists[s].style.display = \"none\";\n            }\n\n            if (content.cookie) {\n                cs_setCookie(content.cookie + \"_\" + s, \"\");\n            }\n        }\n    }\n}\n\nfunction cs_initListGroup(content, mode) {\n    var df = cs_getIdx(mode, content.cookie, 0, content.menu.df);\n\n    cs_refreshList(content.lists[0], cs_getOptions(content.menu), df);\n    if (content.cookie) {\n        cs_setCookie(content.cookie + \"_\" + 0, df);\n    }\n\n    cs_updateListGroup(content, 0, df, mode);\n}\n\nfunction cs_updateList() {\n    var content = this.content;\n    for (var i = 0; i < content.lists.length; i++) {\n        if (content.lists[i] == this) {\n            if (content.cookie) {\n                cs_setCookie(content.cookie + \"_\" + i, this.selectedIndex);\n            }\n\n            if (i < content.lists.length - 1) {\n                cs_updateListGroup(content, i, this.selectedIndex, \"\");\n            }\n        }\n    }\n}\n\nfunction cs_getIdx(mode, name, idx, df) {\n    if (mode) {\n        var cs_idx = cs_getCookie(name + \"_\" + idx);\n        if (cs_idx != \"\") {\n            df = parseInt(cs_idx);\n        }\n    }\n    return df;\n}\n\nfunction _setCookie(name, value) {\n    return;\n    document.cookie = name + \"=\" + value;\n}\n\nfunction cs_setCookie(name, value) {\n    return;\n    setTimeout(\"_setCookie('\" + name + \"','\" + value + \"')\", 0);\n}\n\nfunction cs_getCookie(name) {\n    return \"\";\n    var cookieRE = new RegExp(name + \"=([^;]+)\");\n    if (document.cookie.search(cookieRE) != -1) {\n        return RegExp.$1;\n    }\n    else {\n        return \"\";\n    }\n}\n\n// ----\nfunction addListGroup(n, tm) {\n    if (cs_goodContent) {\n        cs_curTop = new cs_topmenuOBJ(tm);\n        cs_curSub = null;\n\n        var c = cs_findContent(n);\n        if (c == null) {\n            cs_content[cs_content.length] = new cs_contentOBJ(n, cs_curTop);\n        }\n        else {\n            delete (c.menu); c.menu = cs_curTop;\n        }\n    }\n}\n\nfunction addList(n, dis, link, sub, df) {\n    if (cs_goodContent) {\n        cs_curSub = cs_findMenu(n);\n\n        if (cs_curSub != null) {\n            cs_curSub.addM(dis, link || \"\", sub);\n            \n            if (typeof (df) != \"undefined\") {\n                cs_curSub.df = cs_curSub.items.length - 1;\n            }\n        }\n        else {\n            cs_badContent(n);\n        }\n    }\n}\n\nfunction addOption(n, dis, link, df) {\n    if (cs_goodContent) {\n        cs_curSub = cs_findMenu(n);\n\n        if (cs_curSub != null) {\n            cs_curSub.addL(dis, link || \"\");\n            \n            if (typeof (df) != \"undefined\") {\n                cs_curSub.df = cs_curSub.items.length - 1;\n            }\n        }\n        else {\n            cs_badContent(n);\n        }\n    }\n}\n\nfunction initListGroup(n) {\n    var _content = cs_findContent(n), count = 0;\n    if (_content != null) {\n        content = new cs_contentOBJ(\"cs_\" + n, _content.menu);\n        cs_content[cs_content.length] = content;\n\n        for (var i = 1; i < initListGroup.arguments.length; i++) {\n            if (typeof (arguments[i]) == \"object\" && arguments[i].tagName && arguments[i].tagName === \"SELECT\") {\n                content.lists[count] = arguments[i];\n\n                arguments[i].onchange = cs_updateList;\n                arguments[i].content = content; arguments[i].idx = count++;\n            }\n            else if (typeof (arguments[i]) == \"string\" && /^[a-zA-Z_]\\w*$/.test(arguments[i])) {\n                content.cookie = arguments[i];\n            }\n        }\n\n        if (content.lists.length > 0) {\n            cs_initListGroup(content, content.cookie);\n        }\n    }\n}\n\nfunction resetListGroup(n) {\n    var content = cs_findContent(\"cs_\" + n);\n    \n    if (content != null && content.lists.length > 0) {\n        cs_initListGroup(content, \"\");\n    }\n}\n// ------\n"]}