📄 选择一课题会出现相同的事例（重要）.htm
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<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>标题页</title>
</head>
<body>
<form method="post" name="form1">
<select name="select1" onchange="select()"></select>
<select name="select2"></select>
<select name="select3"></select>
</form>
<script language="javascript">
var arrText = new Array(3);
var arrValue = new Array(arrText.length);
//设置3个下拉框的值
function objSetOption(select1, select2, select3) {
this.select1 = select1;
this.select2 = select2;
this.select3 = select3;
}
//指定3个下拉框的值
arrText[0]= new objSetOption("选择A:", "选择B_1:,选择B_2:", "选择C_1:,选择C_2:");
arrText[1] = new objSetOption("论文:A", "语文:A,数学:B,英语:C", "初中:A,高中:B");
arrText[2] = new objSetOption("例题:A", "显示A2_1:值B2_1,显示A2_2:值B2_2", "显示A3_1:值B3_1,显示B3_2:值B3_2");
//判断用户的选择
function select() {
var eltSelect1 = document.form1.select1;
var eltSelect2 = document.form1.select2;
var eltSelect3 = document.form1.select3;
var arrSelect1, arrSelect2, arrSelect3;
var arrData1, arrData2, arrData3;
//如果选择的是第一个下拉框
with(eltSelect1) {
var strSelect = options[selectedIndex].value;
}
for(i = 0;i < arrText.length;i ++) {
arrSelect1 = arrText[i].select1;
arrData1 = arrSelect1.split(":");
if (arrData1[1] == strSelect) {
arrSelect2 = (arrText[i].select2).split(",");
for(j = 0;j < arrSelect2.length;j++) {
arrData2 = arrSelect2[j].split(":");
//如果选择的是第二个下拉框
with(eltSelect2) {
length = arrSelect2.length;
options[j].text = arrData2[0];
options[j].value = arrData2[1];
}
}
arrSelect3 = (arrText[i].select3).split(",");
for(j = 0;j < arrSelect3.length;j++) {
arrData3 = arrSelect3[j].split(":");
//如果选择的是第三个下拉框
with(eltSelect3) {
length = arrSelect3.length;
options[j].text = arrData3[0];
options[j].value = arrData3[1]; }
}
break; }
}
}
//初始化设置3个下拉框
function init() {
var eltSelect1 = document.form1.select1;
var eltSelect2 = document.form1.select2;
var eltSelect3 = document.form1.select3;
var arrSelect1, arrSelect2, arrSelect3;
var arrData1, arrData2, arrData3;
if (eltSelect1 != undefined && eltSelect2 != undefined && eltSelect3 != undefined) {
with(eltSelect1) {
length = arrText.length;
for(i = 0;i < arrText.length;i ++) {
arrSelect1 = arrText[i].select1;
arrData1 = arrSelect1.split(":");
options[i].text = arrData1[0];
options[i].value = arrData1[1];
}
}
with(eltSelect2) {
arrSelect2 = (arrText[0].select2).split(",");
length = arrSelect2.length;
for(i = 0;i < length;i ++) {
arrData2 = arrSelect2[i].split(":");
options[i].text = arrData2[0];
options[i].value = arrData2[1];
}
}
with(eltSelect3) {
arrSelect3 = (arrText[0].select3).split(",");
length = arrSelect3.length;
for(i = 0;i < length;i ++) {
arrData3 = arrSelect3[i].split(":");
options[i].text = arrData3[0];
options[i].value = arrData3[1]; } }
}
}
init();
</script>
</body>
</html>
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