本文實例講述了JS簡單實現多級Select聯動菜單效果代碼。分享給大家供大家參考。具體如下：
JS聯動菜單，簡單代碼實現JS多級Select聯動菜單，也就是大家常用的一款菜單，Select聯動狀態的菜單，網頁上經常見到的效果，希望大家能用得上。
運行效果截圖如下：
在線演示地址如下：
http://demo.VeVB.COm/js/2015/js-simple-select-ld-menu-codes/
具體代碼如下：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><title>JS聯動下拉框</title><script language="javascript" >/* ** ====================================** 類名：CLASS_LIANDONG_YAO ** 功能：多級連動菜單 ** 作者：YAODAYIZI **/ function CLASS_LIANDONG_YAO(array) { //數組，聯動的數據源 this.array=array; this.indexName=''; this.obj=''; //設置子SELECT // 參數：當前onchange的SELECT ID，要設置的SELECT ID this.subSelectChange=function(selectName1,selectName2) { //try //{ var obj1=document.all[selectName1]; var obj2=document.all[selectName2]; var objName=this.toString(); var me=this; obj1.onchange=function() { me.optionChange(this.options[this.selectedIndex].value,obj2.id) } } //設置第一個SELECT // 參數：indexName指選中項,selectName指select的ID this.firstSelectChange=function(indexName,selectName) { this.obj=document.all[selectName]; this.indexName=indexName; this.optionChange(this.indexName,this.obj.id) } // indexName指選中項,selectName指select的ID this.optionChange=function (indexName,selectName) { var obj1=document.all[selectName]; var me=this; obj1.length=0; obj1.options[0]=new Option("請選擇",''); for(var i=0;i<this.array.length;i++) { if(this.array[i][1]==indexName) { //alert(this.array[i][1]+" "+indexName); obj1.options[obj1.length]=new Option(this.array[i][2],this.array[i][0]); } } } } </script></head><body><form name="form1" method="post"> <SELECT ID="s1" NAME="s1" > <OPTION selected></OPTION> </SELECT> <SELECT ID="s2" NAME="s2" > <OPTION selected></OPTION> </SELECT> <SELECT ID="s3" NAME="s3"> <OPTION selected></OPTION> </SELECT> <br> <br><br> <SELECT ID="x1" NAME="x1" > <OPTION selected></OPTION> </SELECT> <SELECT ID="x2" NAME="x2" > <OPTION selected></OPTION> </SELECT> <SELECT ID="x3" NAME="x3"> <OPTION selected></OPTION> </SELECT> <SELECT ID="x4" NAME="x4"> <OPTION selected></OPTION> </SELECT> <SELECT ID="x5" NAME="x5"> <OPTION selected></OPTION> </SELECT> </form> </body><script language="javascript">//例子1-------------------------------------------------------------//數據源var array=new Array(); array[0]=new Array("華南地區","根目錄","華南地區"); //數據格式 ID，父級ID，名稱 array[1]=new Array("華北地區","根目錄","華北地區"); array[2]=new Array("上海","華南地區","上海"); array[3]=new Array("廣東","華南地區","廣東"); array[4]=new Array("徐家匯","上海","徐家匯"); array[5]=new Array("普托","上海","普托"); array[6]=new Array("廣州","廣東","廣州"); array[7]=new Array("湛江","廣東","湛江"); //-------------------------------------------- //這是調用代碼 var liandong=new CLASS_LIANDONG_YAO(array) //設置數據源 liandong.firstSelectChange("根目錄","s1"); //設置第一個選擇框 liandong.subSelectChange("s1","s2"); //設置子級選擇框 liandong.subSelectChange("s2","s3"); //例子2------------------------------------------------------------- //數據源 var array2=new Array();//數據格式 ID，父級ID，名稱 array2[0]=new Array("測試測試","根目錄","測試測試"); array2[1]=new Array("華北地區","根目錄","華北地區"); array2[2]=new Array("上海","測試測試","上海"); array2[3]=new Array("廣東","測試測試","廣東"); array2[4]=new Array("徐家匯","上海","徐家匯"); array2[5]=new Array("普托","上海","普托"); array2[6]=new Array("廣州","廣東","廣州"); array2[7]=new Array("湛江","廣東","湛江"); array2[8]=new Array("不知道","湛江","不知道"); array2[9]=new Array("5555","湛江","555"); array2[10]=new Array("++++","不知道","++++"); array2[11]=new Array("111","徐家匯","111"); array2[12]=new Array("222","111","222"); array2[13]=new Array("333","222","333"); //-------------------------------------------- //這是調用代碼 //設置數據源 var liandong2=new CLASS_LIANDONG_YAO(array2); //設置第一個選擇框 liandong2.firstSelectChange("根目錄","x1"); //設置子選擇框 liandong2.subSelectChange("x1","x2") liandong2.subSelectChange("x2","x3") liandong2.subSelectChange("x3","x4") liandong2.subSelectChange("x4","x5")</script></html>希望本文所述對大家的JavaScript程序設計有所幫助。
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