日期:2014-05-16 浏览次数:20349 次
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>ww.html</title> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="this is my page"> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <script type="text/javascript"> var classification_names = [["一年一班","一年二班"],["二年一班"],["三年一班"],["四年一班"]]; var classificaiton_ids = [[1,2],[3],[4],[5]]; function class_onchange(){ //删除前面所有分类 var classifications = document.getElementById("classifications"); classifications.options.length = 0;//清空前一次的选项 //获得所选班级id var classid=document.getElementById("class").value; //获得id班级所有分类名 var thisClassifcationNames=classification_names[classid]; if(!thisClassifcationNames){ return; } //获得id班级所有分类id var thisClassifcationIds=classificaiton_ids[classid]; if(!thisClassifcationIds){ return; } //设置该班级分类选项 var nullOption = document.createElement("option"); nullOption.text="--请选择分类--"; nullOption.value=""; classifications.options.add(nullOption); classifications.value=""; for(var i=0;i<thisClassifcationNames.length;i++){ var option = document.createElement("option"); option.text=thisClassifcationNames[i]; option.value=thisClassifcationIds[i]; classifications.options.add(option); } } </script> </head> <body> 班级 <select id="class" name="class" onchange="return class_onchange()"> <option value="-1" selected="selected"> 请选择年级 </option> <option value="0"> 一年级 </option> <option value="1"> 二年级 </option> <option value="2"> 三年级 </option> <option value="3"> 四年级 </option> </select> 分类 <select id="classifications" name="classifications"> <option value="-1" selected="selected"> 请选择班级 </option> </select> </body> </html>?