<form name= "serachform" method= post action= userlogin/search.asp >
<td>
<input name= keyword size=18 maxlength=80>
<select name= choice onchange="if(this.options[this.selectedIndex].value!=1) btype.innerHTML=''">
<option value= 1 selected>产 品</option>
<option value= 2 >公 司</option>
<option value= 3 >行情信息</option>
<option value= 4 >网站</option>
</select>
<select name=btype style="width:202px">
<option value="0" selected>任何分类*</option>
....
</form>
<td>
<input name= keyword size=18 maxlength=80>
<select name= choice onchange="if(this.options[this.selectedIndex].value!=1) btype.innerHTML=''">
<option value= 1 selected>产 品</option>
<option value= 2 >公 司</option>
<option value= 3 >行情信息</option>
<option value= 4 >网站</option>
</select>
<select name=btype style="width:202px">
<option value="0" selected>任何分类*</option>
....
</form>
{
// src :select对象
var srcindex=eval(src.btype.selectedIndex); //当前选中的选项
var srclength=eval(src.btype.length); //select对象选项长度,有几个项选
// 删除...
if (eval(src.choice.value)=="4")
{
if(srcindex>0){
src.btype.options[srcindex]=null;
src.btype.selectedIndex=-1;
}
}
}
这是角本<form name= "serachform" method= post action= userlogin/search.asp >
<td>
<input name= keyword size=18 maxlength=80>
<select name= choice onclick="deleteOption(searchform)">
<option value="1" selected>产 品</option>
<option value="2">公 司</option>
<option value="3">行情信息</option>
<option value="4">网站</option>
</select>
<select name=btype style="width:202px">
<option value="0" selected>任何分类*</option>
....
</form>
selectid.options[selectid.options.length -1 ] = null;