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js implements simple linkage menu effect_javascript skills

WBOY
WBOYOriginal
2016-05-16 15:44:301125browse

The example in this article describes how to implement a simple linkage menu effect using js. Share it with everyone for your reference. The details are as follows:

This is the simplest js linkage menu code, which can be automatically generated in DW. If you don’t want to generate it in DW, you can copy this code and pull it down to modify it. A Select linkage menu is commonly used on web pages.

The screenshot of the running effect is as follows:

The online demo address is as follows:

http://demo.jb51.net/js/2015/js-select-ld-menu-codes/

The specific code is as follows: 

<html>
<head>
<title>简单的Select联动菜单代码</title>
</head>
<body>
<FORM name="F1">
<SELECT NAME="select1" onChange="set_list(this.options.selectedIndex)">
<OPTION SELECTED>流行音乐</OPTION>
<OPTION>网上书籍</OPTION>
<OPTION>软件下载</OPTION>
</SELECT>
<SELECT NAME="select2" >  
<OPTION SELECTED>请选网站</OPTION> 
</SELECT>

<SCRIPT LANGUAGE="JavaScript"> 
var l=document.F1.select1.options.length;
//取得第一下拉菜单的选项数目
var group=new Array(l)
//根据这个数目创建数组
for (i=0; i<l; i++)
//上一个数组的每一个元素也是数组
group[i]=new Array() 
//接下来创建选项，为第二下拉菜单定义内容
group[0][0]=new Option("CNTV","http://www.cntv.cn") 
group[0][1]=new Option("音乐天堂","#") 
group[0][2]=new Option("搜狗音乐","http://mp3.sogou.com/") 

group[1][0]=new Option("网页特效","/jscss") 
group[1][1]=new Option("白鹿书院","http://www.readlink.net") 

group[2][0]=new Option("华军软件园","http://www.newhua.com") 
group[2][1]=new Option("搜狐下载 ","http://it.sohu.com/download/") 
group[2][2]=new Option("中国下载","http://www.download.com.cn") 

var selobj=document.F1.select2; //设定需要动态改变的对象是第二下拉菜单
 
function set_list(x) //x表示第一菜单被选定的内容
{ 
for (m=selobj.options.length-1;m>0;m--) //先清除第二菜单的选项
selobj.options[m]=null 

for (i=0;i<group[x].length;i++){
//根据第一菜单的选定序号，丛控件数组中提取菜单选项放进第二菜单
selobj.options[i]=group[x][i]
//这里也可以创建新的对象，例如：selobj.options[i]=new Option(group[x][i].text,group[x][i].value) 
} 
selobj.options[0].selected=true
//选定第0号选项
} 
function go(){
//这个函数用来将窗口导航到指定的URL
location=selobj.options[selobj.selectedIndex].value
} 
</SCRIPT> 

</FORM> 
<p><INPUT TYPE="BUTTON" NAME="Button" VALUE="go" onclick="go()" style="background-color: #FFFFFF; float: left; font-family: Arial Black; font-size: 10pt; font-weight: bold; text-decoration: blink; color: #000000; font-style: italic; border-style: solid; border-width: 1"></p>
<p>　</p>
</body>
</html>

I hope this article will be helpful to everyone’s JavaScript programming design.

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