在网上很多网友问,关于实现在一个select列表中选择一个项目,在另一个select选项动态更新的情况。其实他的原理很简单的,只有记住几个主要的要点就可以。
下面的例子给出了一个完整的演示。由于看例子比我解说更容易理解,所以我就废话少说,把代码贴出,希望对大家需要的网友有一点帮助。
<HTML> <HEAD> <TITLE> New Document </TITLE> <META NAME="Generator" CONTENT="EditPlus"> <META NAME="Author" CONTENT=""> <META NAME="Keywords" CONTENT=""> <META NAME="Description" CONTENT=""> <style type="text/css"> body{font-family:Courier New, Courier} select{font-size:8pt;font-family:Courier New, Courier} input{font-size:8pt;font-family:Courier New, Courier} </style> <SCRIPT LANGUAGE="JavaScript"> <!-- var Name=new Array(3); var Value=new Array(3); Name[1]=new Array("Zosatapo1","Zosatapo2","Zosatapo3","Zosatapo4"); Name[2]=new Array("Reic Yang1","Reic Yang2","Reic Yang3","Reic Yang4");
function change() { selIndex=document.all("test").selectedIndex; if(document.all("test").selectedIndex==0) return;
for(i=document.all("test").options.length-1;i>-1;i--) { document.all("test").options.remove(i); }
for(i=0;i<Name[selIndex].length;i++) { document.all("test").options.add(new Option(Name[selIndex][i],"name"+i)); }
}
function changeEx(){
for(i=document.all("sub").options.length;i>0;i--) { document.all("sub").options.remove(i-1); }
if(document.all("main").selectedIndex==0){ document.all("sub").options.add(new Option("==========","-1")); return;}
selIndex=document.all("main").selectedIndex;
for(i=0;i<Name[selIndex].length;i++) { document.all("sub").options.add(new Option(Name[selIndex][i],"name"+i)); }
}
function reset(){ for(i=document.all("test").options.length-1;i>-1;i--) { document.all("test").options.remove(i); }
document.all("test").options.add(new Option("==========","-1"));
document.all("test").options.add(new Option("Zosatapo","1"));
document.all("test").options.add(new Option("Reic Yang","2"));
}
function display(object){ alert(object.options[object.selectedIndex].text+" "+object.options[object.selectedIndex].value); } //--> </SCRIPT> </HEAD>
<BODY BGCOLOR="#FFFFFF"> First Sample:<br><font color="blue">All items will change After you Selected!</font><br> <SELECT id="test" onchange="change();"> <option value="-1" selected>========== <option value="1">Zosatapo <option value="2">Reic Yang </SELECT><input name="Reset Select" type="button" value="Reset Select" onclick="reset();" ><br><br>
Second Sample:<br><font color="blue">You selected Item in Main Select will change the Sub select Content!</font><br> Main Select:<SELECT id="main" onchange="changeEx();"> <option value="-1" selected>========== <option value="1">Zosatapo <option value="2">Reic Yang </SELECT>
Sub Select:<SELECT id="sub" onchange="display(this);"> <option value="-1" selected>========== </SELECT><br><br> </BODY> </HTML> 
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