选择一个下拉列表的值改变另一个下拉列表的值
//改变贴脸型号,相应改变贴脸宽度
function check_tlkd(i){

//获得id为sel_tlxh下拉列表的值
var tlxh = document.getElementById("sel_tlxh"+i).options[window.document.getElementById("sel_tlxh"+i).selectedIndex].text;
document.getElementById("sel_tlkd"+i).options.length = 0;

//获得id为sel_tlkd的下拉列表
var objSelect = document.getElementById("sel_tlkd"+i);

//当tlxh为1#时,sel_tlkd里面的值为60
if(tlxh == "1#"){
var objOption = new Option("60","298");
objSelect.add(objOption, 0);
}

//当tlxh为1#时,sel_tlkd里面的值为80
else if(tlxh == "2#"){
var objOption = new Option("80","298");
objSelect.add(objOption, 0);
}

//显示其他的值
else{
var objOption = new Option("选择","0");
objSelect.add(objOption, -1);
var objOption = new Option("60","298");
objSelect.add(objOption, -1);
var objOption = new Option("80","299");
objSelect.add(objOption, -1);
var objOption = new Option("其他","999");
objSelect.add(objOption, -1);
}
}







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