本文實例講述了JS實現的Select三級下拉菜單。分享給大家供大家參考。具體如下：
這里使用js實現Select三級下拉菜單，比如全國省市城市選擇、數碼類產品分類、人才類別選擇等，都比較具有代表性，在表單中容易使用Select下拉列表菜單供用戶選擇，當然，自己用還是需要稍微改動的，比如至少菜單內容要改成自己需要的，其它的好說。
運行效果如下圖所示：
在線演示地址如下：
http://demo.VeVB.COm/js/2015/js-3-select-menu-codes/
具體代碼如下：
<html><head><title>三級下拉菜單(通用版)</title><meta http-equiv="Content-Type" content="text/html; charset=gb2312"></head><body><SCRIPT LANGUAGE="JavaScript">function CreateSelect(_FormName,_SName,_SValue,_Ds,_AllOptionStr,ShowType){ if (_FormName=="") _FormName = "all" var _DsArr = _Ds.split("|") var _Ds1,_Ds2,_Ds3 var _Ds1 = _DsArr[0] var _Ds2 = (_DsArr.length>1)?_DsArr[1]:_DsArr[0] var _Ds3 = (_DsArr.length>2)?_DsArr[2]:_DsArr[0] var _SNameArr = _SName.split("|") var _SName1,_SName2,_SName3 var _SName1 = _SNameArr[0] var _SName2 = (_SNameArr.length>1)?_SNameArr[1]:_SNameArr[0] var _SName3 = (_SNameArr.length>2)?_SNameArr[2]:_SNameArr[0] var _SValueArr = _SValue.split("|") var _SValue1,_SValue2,_SValue3 var _SValue1 = _SValueArr[0] var _SValue2 = (_SValueArr.length>1)?_SValueArr[1]:_SValueArr[0] var _SValue3 = (_SValueArr.length>2)?_SValueArr[2]:_SValueArr[0] if (ShowType==3){ _AllOptionStr = _AllOptionStr.replace(//(/(/ig,"/(/("+_Ds3+"/^") _AllOptionStr = _AllOptionStr.replace(//{/{/ig,"/{/{"+_Ds2+"/(/("+_Ds3+"/*/*") } else if(ShowType==2){ _AllOptionStr = _AllOptionStr.replace(//{/{/ig,"/{/{"+_Ds2+"/(/("+_Ds3+"/*/*") } else if(ShowType==1){ _AllOptionStr = _AllOptionStr.replace(//(/(/ig,"/(/("+_Ds3+"/^") } var AllStr = _Ds1 + "{{"+ _Ds2 + "(("+ _Ds3 +"||"+_AllOptionStr var _AR0 = AllStr.split("||"); document.writeln("<select name=/"" + _SName1 + "/" size=/"1/" onChange=/""+_SName1+"redirect(this.options.selectedIndex)/">"); for (var i1 = 0;i1 < _AR0.length;i1++) { var Area1Str = _AR0[i1]; var _AR10 = Area1Str.split("{{"); var _AR11 = _AR10[0].split("@"); var Tstr1 = _AR11[0]; var Vstr1 = (_AR11.length==2)?_AR11[1]:_AR11[0] document.writeln("<option value=/""+Vstr1+"/">"+Tstr1+"<//option>"); } document.writeln("<//select>"); document.writeln("<select name=/"" + _SName2 + "/" size=/"1/" onChange=/""+_SName1+"redirect1(this.options.selectedIndex)/">"); var _AR111 = _Ds2.split("@"); var Tstr11 = _AR111[0]; var Vstr11 = (_AR111.length==2)?_AR111[1]:_AR111[0]; document.writeln("<option value=/""+Vstr11+"/">"+Tstr11+"<//option>"); document.writeln("<//select>"); document.writeln("<select name=/"" + _SName3 + "/" size=/"1/">"); var _AR222 = _Ds3.split("@"); var Tstr22 = _AR222[0]; var Vstr22 = (_AR222.length==2)?_AR222[1]:_AR222[0]; document.writeln("<option value=/""+Vstr22+"/">"+Tstr22+"<//option>"); document.writeln("<//select>"); document.writeln("<S"+"CRIPT LANGUAGE=/"JavaScript/" defer>"); document.writeln("<!--"); document.writeln("var "+_SName1+"NewAllStr = /""+ AllStr +"/""); document.writeln("var "+_SName1+"_AR0 = "+_SName1+"NewAllStr.split(/"||/");"); document.writeln("var "+_SName1+"groups=document."+ _FormName +"." + _SName1 + ".options.length;"); document.writeln("var "+_SName1+"group=new Array("+_SName1+"groups)"); document.writeln("for (i=0; i<"+_SName1+"groups; i++){"); document.writeln(" "+_SName1+"group[i]=new Array();"); document.writeln("}"); document.writeln("for (var i1 = 0;i1 < "+_SName1+"_AR0.length;i1++){"); document.writeln(" var Area1Str = "+_SName1+"_AR0[i1];"); document.writeln(" var _AR10 = Area1Str.split(/"{{/");"); document.writeln(" var _AR12 = _AR10[1].split(/"**/");"); document.writeln(" for (var i2 = 0;i2 < _AR12.length;i2++){"); document.writeln(" var Area2Str = _AR12[i2];"); document.writeln(" var _AR20 = Area2Str.split(/"((/");"); document.writeln(" var _AR211 = _AR20[0].split(/"@/");"); document.writeln(" var Tstr2 = _AR211[0];"); document.writeln(" var Vstr2 = (_AR211.length==2)?_AR211[1]:_AR211[0];"); document.writeln(" "+_SName1+"group[i1][i2]=new Option(Tstr2,Vstr2);"); document.writeln(" }"); document.writeln("}"); document.writeln("var "+_SName1+"temp = document."+ _FormName +"." + _SName2); document.writeln("function "+_SName1+"redirect(x){"); document.writeln(" for (m="+_SName1+"temp.options.length-1;m>0;m--)"); document.writeln(" "+_SName1+"temp.options[m]=null;"); document.writeln(" for (i=0;i<"+_SName1+"group[x].length;i++){"); document.writeln(" "+_SName1+"temp.options[i]=new Option("+_SName1+"group[x][i].text,"+_SName1+"group[x][i].value);"); document.writeln(" }"); document.writeln(" "+_SName1+"temp.options[0].selected=true"); document.writeln(" "+_SName1+"redirect1(0)"); document.writeln("}"); document.writeln("var "+_SName1+"Group2s=document."+ _FormName +"." + _SName2 + ".options.length;"); document.writeln("var "+_SName1+"Group2=new Array("+_SName1+"groups);"); document.writeln("for (i=0; i<"+_SName1+"groups; i++){"); document.writeln(" "+_SName1+"Group2[i]=new Array("+_SName1+"group[i].length)"); document.writeln(" for (j=0; j<"+_SName1+"group[i].length; j++){"); document.writeln(" "+_SName1+"Group2[i][j]=new Array()"); document.writeln(" }"); document.writeln("}"); document.writeln("for (var i1 = 0;i1 < "+_SName1+"_AR0.length;i1++){"); document.writeln(" var Area1Str = "+_SName1+"_AR0[i1]"); document.writeln(" var _AR10 = Area1Str.split(/"{{/");"); document.writeln(" var _AR12 = _AR10[1].split(/"**/");"); document.writeln(" for (var i2 = 0;i2 < _AR12.length;i2++){"); document.writeln(" var Area2Str = _AR12[i2]"); document.writeln(" var _AR20 = Area2Str.split(/"((/");"); document.writeln(" _AR212 = _AR20[1].split(/"^/");"); document.writeln(" for (var i3 = 0;i3 < _AR212.length;i3++){"); document.writeln(" Area3Str = _AR212[i3]"); document.writeln(" _AR3 = Area3Str.split(/"@/");"); document.writeln(" Tstr3 = _AR3[0]"); document.writeln(" Vstr3 = (_AR3.length==2)?_AR3[1]:_AR3[0]"); document.writeln(" "+_SName1+"Group2[i1][i2][i3]=new Option(Tstr3,Vstr3);"); document.writeln(" }"); document.writeln(" }"); document.writeln("}"); document.writeln("var "+_SName1+"temp1=document."+ _FormName +"." + _SName3 + ""); document.writeln("function "+_SName1+"redirect1(y){"); document.writeln(" for (m="+_SName1+"temp1.options.length-1;m>0;m--)"); document.writeln(" "+_SName1+"temp1.options[m]=null"); document.writeln(" for (i=0;i<"+_SName1+"Group2[document."+ _FormName +"." + _SName1 + ".options.selectedIndex][y].length;i++){"); document.writeln(" "+_SName1+"temp1.options[i]=new Option("+_SName1+"Group2[document."+ _FormName +"." + _SName1 + ".options.selectedIndex][y][i].text," + _SName1 + "Group2[document."+ _FormName +"." + _SName1 + ".options.selectedIndex][y][i].value)"); document.writeln(" }"); document.writeln(" "+_SName1+"temp1.options[0].selected=true"); document.writeln("}"); document.writeln("http:////-->"); document.writeln("<//script>"); document.writeln("<s"+"cript language=/"JavaScript/">"); document.writeln("<!--"); document.writeln("function "+_SName1+"SetValue(){"); document.writeln(" try{"); document.writeln(" if (/""+_SValue1+"/"!=/"/"){"); document.writeln(" document."+ _FormName +"."+_SName1+".value=/""+_SValue1+"/""); document.writeln(" "+_SName1+"redirect(document."+ _FormName +"."+_SName1+".options.selectedIndex);"); document.writeln(" if (/""+_SValue2+"/"!=/"/"){"); document.writeln(" document."+ _FormName +"."+_SName2+".value=/""+_SValue2+"/""); document.writeln(" "+_SName1+"redirect1(document."+ _FormName +"."+_SName2+".options.selectedIndex)"); document.writeln(" if (/""+_SValue3+"/"!=/"/")"); document.writeln(" document."+ _FormName +"."+_SName3+".value=/""+_SValue3+"/""); document.writeln(" }"); document.writeln(" }"); document.writeln(" }"); document.writeln(" catch(e){"); document.writeln(" }"); document.writeln("}"); document.writeln("window.attachEvent(/"onload/","+_SName1+"SetValue)"); document.writeln("http:////-->"); document.writeln("<//script>");}</script><SCRIPT LANGUAGE="JavaScript"><!--var AllStr1 = ""+"東北地區{{" +"黑龍江((哈爾濱^齊齊哈爾^牡丹江^佳木斯^大慶^綏化^鶴崗^雞西^黑河^雙鴨山^伊春^七臺河^大興安嶺" +"**吉林((長春^吉林^四平^遼源^通化^白山^松原^白城^延邊" +"**遼寧((沈陽^大連^鞍山^撫順^本溪^丹東^錦州^營口^阜新^遼陽^盤錦^鐵嶺^朝陽^葫蘆島"+"||華北地區{{" +"北京((東城^西城^崇文^宣武^朝陽^豐臺^石景山^海淀^門頭溝^房山^通州^順義^昌平^大興^平谷^懷柔^密云^延慶" +"**天津((和平^東麗^河東^西青^河西^津南^南開^北辰^河北^武清^紅撟^塘沽^漢沽^大港^寧河^靜海^寶坻^薊縣" +"**山東((濟南^青島^淄博^棗莊^東營^煙臺^濰坊^濟寧^泰安^威海^日照^萊蕪^臨沂^德州^聊城^濱州^菏澤" +"**河北((石家莊^邯鄲^邢臺^保定^張家口^承德^廊坊^唐山^秦皇島^滄州^衡水" +"**河南((鄭州^開封^洛陽^平頂山^安陽^鶴壁^新鄉^焦作^濮陽^許昌^漯河^三門峽^南陽^商丘^信陽^周口^駐馬店^濟源" +"**山西((太原^大同^陽泉^長治^晉城^朔州^呂梁^忻州^晉中^臨汾^運城" +"**內蒙古((呼和浩特^包頭^烏海^赤峰^呼倫貝爾盟^阿拉善盟^哲里木盟^興安盟^烏蘭察布盟^錫林郭勒盟^巴彥淖爾盟^伊克昭盟"+"||華中地區{{" +"湖北((武漢^宜昌^荊州^襄樊^黃石^荊門^黃岡^十堰^恩施^潛江^天門^仙桃^隨州^咸寧^孝感^鄂州" +"**湖南((長沙^常德^株洲^湘潭^衡陽^岳陽^邵陽^益陽^婁底^懷化^郴州^永州^湘西^張家界"+"||華南地區{{" +"廣東((廣州^深圳^珠海^汕頭^東莞^中山^佛山^韶關^江門^湛江^茂名^肇慶^惠州^梅州^汕尾^河源^陽江^清遠^潮州^揭陽^云浮" +"**廣西((南寧^柳州^桂林^梧州^北海^防城港^欽州^貴港^玉林^南寧地區^柳州地區^賀州^百色^河池" +"**福建((福州^廈門^莆田^三明^泉州^漳州^南平^龍巖^寧德" +"**海南((海口^三亞"+"||西南地區{{" +"四川((成都^綿陽^德陽^自貢^攀枝花^廣元^內江^樂山^南充^宜賓^廣安^達川^雅安^眉山^甘孜^涼山^瀘州" +"**重慶((萬州^涪陵^渝中^大渡口^江北^沙坪壩^九龍坡^南岸^北碚^萬盛^雙撟^渝北^巴南^黔江^長壽^綦江^潼南^銅梁^大足^榮昌^壁山^梁平^城口^豐都^墊江^武隆^忠縣^開縣^云陽^奉節^巫山^巫溪^石柱^秀山^酉陽^彭水^江津^合川^永川^南川" +"**貴州((貴陽^六盤水^遵義^安順^銅仁^黔西南^畢節^黔東南^黔南" +"**云南((昆明^大理^曲靖^玉溪^昭通^楚雄^紅河^文山^思茅^西雙版納^保山^德宏^麗江^怒江^迪慶^臨滄" +"**西藏((拉薩^日喀則^山南^林芝^昌都^阿里^那曲"+"||西北地區{{" +"陜西((西安^寶雞^咸陽^銅川^渭南^延安^榆林^漢中^安康^商洛" +"**甘肅((蘭州^嘉峪關^金昌^白銀^天水^酒泉^張掖^武威^定西^隴南^平涼^慶陽^臨夏^甘南" +"**寧夏((銀川^石嘴山^吳忠^固原" +"**青海((西寧^海東^海南^海北^黃南^玉樹^果洛^海西" +"**新疆((烏魯木齊^石河子^克拉瑪依^伊犁^巴音郭勒^昌吉^克孜勒蘇柯爾克孜^博爾塔拉^吐魯番^哈密^喀什^和田^阿克蘇"+"||華東地區{{" +"上海((黃浦^盧灣^徐匯^長寧^靜安^普陀^閘北^虹口^楊浦^閔行^寶山^嘉定^浦東^金山^松江^青浦^南匯^奉賢^崇明" +"**江蘇((南京^鎮江^蘇州^南通^揚州^鹽城^徐州^連云港^常州^無錫^宿遷^泰州^淮安" +"**浙江((杭州^寧波^溫州^嘉興^湖州^紹興^金華^衢州^舟山^臺州^麗水" +"**安徽((合肥^蕪湖^蚌埠^馬鞍山^淮北^銅陵^安慶^黃山^滁州^宿州^池州^淮南^巢湖^阜陽^六安^宣城^亳州" +"**江西((南昌市^景德鎮^九江^鷹潭^萍鄉^新馀^贛州^吉安^宜春^撫州^上饒"+"||港澳臺地區{{" +"香港((香港" +"**澳門((澳門" +"**臺灣((臺北^高雄^臺中^臺南^屏東^南投^云林^新竹^彰化^苗栗^嘉義^花蓮^桃園^宜蘭^基隆^臺東^金門^馬祖^澎湖"+"||其它地區{{" +"其它((其它"</SCRIPT><FORM name="HwForm"><HR>選擇一次<br><SCRIPT LANGUAGE="JavaScript">CreateSelect("","S_13|S_23|S_33","","請選擇地區@|請選擇省份@|請選擇城市@",AllStr1,0);</SCRIPT><HR>選擇三次<br><SCRIPT LANGUAGE="JavaScript">CreateSelect("HwForm","S_1|S_2|S_3","華北地區|山東|濟寧","請選擇地區@|請選擇省份@|請選擇城市@",AllStr1,3);</SCRIPT><SCRIPT LANGUAGE="JavaScript"><!--var AllStr2 = ""+"筆記本{{" +"IBM((R32^T40^T42" +"**DELL((N600^M600"+"||數碼相機{{" +"CANON((A75^A80^A85" +"**SONY((S80^S60"</SCRIPT><HR>選擇二次<br><SCRIPT LANGUAGE="JavaScript">CreateSelect("HwForm","S_11|S_21|S_31","筆記本|IBM|T42","請選擇分類@|請選擇品牌@|請選擇系列@",AllStr2,2);</SCRIPT><HR>選擇二次<br><SCRIPT LANGUAGE="JavaScript">CreateSelect("HwForm","S_12|S_22|S_32","","請選擇分類@|請選擇品牌@|請選擇系列@",AllStr2,1);</SCRIPT></FORM></body></html>希望本文所述對大家的javascript程序設計有所幫助。
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