三级关联下拉菜单,该如何解决
日期：2014-05-18 浏览次数：20693 次
三级关联下拉菜单
谁能给我一个三级关联下拉菜单；选项值均从数据库中读取的JSP程序例子啊？
------解决方案--------------------
你的意思是不是这样的:
<html>
<body>
<select name= "zs " onchange= "demo() ">
<option value= " ">
==请选择==
</option>
<option value= "0 ">
整数
</option>
<option value= "1 ">
小数
</option>
</select>
<select name= "xs " onchange= "demo1() ">
<option value= " ">
==请选择==
</option>
</select>
<select name= "sz ">
<option value= " ">
==请选择==
</option>
</select>
</body>
</html>
<script language= "javascript ">
function demo(){
var zs = document.getElementById( "zs ").value;
if(zs== '0 '){
document.getElementById( "xs ").options[0] = new Option( "正整数 ", "1 ");
document.getElementById( "xs ").options[1] = new Option( "负整数 ", "2 ");
}else{
document.getElementById( "xs ").options[0] = new Option( "正小数 ", "3 ");
document.getElementById( "xs ").options[1] = new Option( "负小数 ", "4 ");
}
}
function demo1(){
var xs = document.getElementById( "xs ").value;
if(xs== '1 '){
document.getElementById( "sz ").options[0] = new Option( "1 ", "1 ");
document.getElementById( "sz ").options[1] = new Option( "2 ", "2 ");
document.getElementById( "sz ").options[2] = new Option( "3 ", "3 ");
document.getElementById( "sz ").options[3] = new Option( "4 ", "4 ");
}
if(xs== '2 '){
document.getElementById( "sz ").options[0] = new Option( "-1 ", "-1 ");
document.getElementById( "sz ").options[1] = new Option( "-2 ", "-2 ");
document.getElementById( "sz ").options[2] = new Option( "-3 ", "-3 ");
document.getElementById( "sz ").options[3] = new Option( "-4 ", "-4 ");
}
if(xs== '3 '){
document.getElementById( "sz ").options[0] = new Option( "0.1 ", "0.1 ");
document.getElementById( "sz ").options[1] = new Option( "0.2 ", "0.2 ");
document.getElementById( "sz ").options[2] = new Option( "0.3 ", "0.3 ");
document.getElementById( "sz ").options[3] = new Option( "0.4 ", "0.4 ");
}
if(xs== '4 '){
document.getElementById( "sz ").options[0] = new Option( "-0.1 ", "-0.1 ");
document.getElementById( "sz ").options[1] = new Option( "-0.2 ", "-0.2 ");
document.getElementById( "sz ").options[2] = new Option
谁能给我一个三级关联下拉菜单；选项值均从数据库中读取的JSP程序例子啊？
------解决方案--------------------
你的意思是不是这样的:
<html>
<body>
<select name= "zs " onchange= "demo() ">
<option value= " ">
==请选择==
</option>
<option value= "0 ">
整数
</option>
<option value= "1 ">
小数
</option>
</select>
<select name= "xs " onchange= "demo1() ">
<option value= " ">
==请选择==
</option>
</select>
<select name= "sz ">
<option value= " ">
==请选择==
</option>
</select>
</body>
</html>
<script language= "javascript ">
function demo(){
var zs = document.getElementById( "zs ").value;
if(zs== '0 '){
document.getElementById( "xs ").options[0] = new Option( "正整数 ", "1 ");
document.getElementById( "xs ").options[1] = new Option( "负整数 ", "2 ");
}else{
document.getElementById( "xs ").options[0] = new Option( "正小数 ", "3 ");
document.getElementById( "xs ").options[1] = new Option( "负小数 ", "4 ");
}
}
function demo1(){
var xs = document.getElementById( "xs ").value;
if(xs== '1 '){
document.getElementById( "sz ").options[0] = new Option( "1 ", "1 ");
document.getElementById( "sz ").options[1] = new Option( "2 ", "2 ");
document.getElementById( "sz ").options[2] = new Option( "3 ", "3 ");
document.getElementById( "sz ").options[3] = new Option( "4 ", "4 ");
}
if(xs== '2 '){
document.getElementById( "sz ").options[0] = new Option( "-1 ", "-1 ");
document.getElementById( "sz ").options[1] = new Option( "-2 ", "-2 ");
document.getElementById( "sz ").options[2] = new Option( "-3 ", "-3 ");
document.getElementById( "sz ").options[3] = new Option( "-4 ", "-4 ");
}
if(xs== '3 '){
document.getElementById( "sz ").options[0] = new Option( "0.1 ", "0.1 ");
document.getElementById( "sz ").options[1] = new Option( "0.2 ", "0.2 ");
document.getElementById( "sz ").options[2] = new Option( "0.3 ", "0.3 ");
document.getElementById( "sz ").options[3] = new Option( "0.4 ", "0.4 ");
}
if(xs== '4 '){
document.getElementById( "sz ").options[0] = new Option( "-0.1 ", "-0.1 ");
document.getElementById( "sz ").options[1] = new Option( "-0.2 ", "-0.2 ");
document.getElementById( "sz ").options[2] = new Option
免责声明： 本文仅代表作者个人观点，与爱易网无关。其原创性以及文中陈述文字和内容未经本站证实，对本文以及其中全部或者部分内容、文字的真实性、完整性、及时性本站不作任何保证或承诺，请读者仅作参考，并请自行核实相关内容。
