js 实现二级联动
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2022-05-17 16:07:24
onchange 事件 使用字典方式添加数据 一级数据显示 二级数据联动 方式一 二级数据联动 方式二 ......
onchange 事件
<body>
<select id="province" onchange="func1()">
<option value="shandong">山东</option>
<option value="hebei">河北</option>
<option value="beijing">北京</option>
</select>
</body>
<script>
function func1(){
var pro = document.getelementbyid("province");
console.log(pro.value)
}
</script>
使用字典方式添加数据
一级数据显示
<body>
<select id="province" >
</select>
</body>
<script>
data = {"广东省":["广州","佛山"],"北京":["海淀","廊坊"], "海南省":["三亚","海口"]};
var pro = document.getelementbyid("province");
for (var i in data){
var option_pro = document.createelement("option");
option_pro.innerhtml=i;
pro.appendchild(option_pro);
}
</script>
二级数据联动 方式一
<body>
<select id="province" onchange="func1(this)" >
</select>
<select id="city"></select>
</body>
<script>
data = {"广东省":["广州","佛山"],"北京":["海淀","廊坊"], "海南省":["三亚","海口"]};
var pro = document.getelementbyid("province");
var city = document.getelementbyid("city");
for (var i in data){
var option_pro = document.createelement("option");
option_pro.innerhtml=i;
pro.appendchild(option_pro);
}
function func1(self){
//console.log((self.options[self.selectedindex]).innerhtml);
var choice = (self.options[self.selectedindex]).innerhtml;
var options = city.children;
for (var k=0; k<options.length; k++){
city.removechild(options[k--]);
}
for (var i in data[choice]){
var option_city = document.createelement("option");
option_city.innerhtml = data[choice][i];
city.appendchild(option_city);
}
}
</script>
二级数据联动 方式二
<body>
<select id="province" onchange="func1(this)" >
</select>
<select id="city"></select>
</body>
<script>
data = {"广东省":["广州","佛山"],"北京":["海淀","廊坊"], "海南省":["三亚","海口"]};
var pro = document.getelementbyid("province");
var city = document.getelementbyid("city");
for (var i in data){
var option_pro = document.createelement("option");
option_pro.innerhtml=i;
pro.appendchild(option_pro);
}
function func1(self){
//console.log((self.options[self.selectedindex]).innerhtml);
var choice = (self.options[self.selectedindex]).innerhtml;
city.options.length=0;
for (var i in data[choice]){
var option_city = document.createelement("option");
option_city.innerhtml = data[choice][i];
city.appendchild(option_city);
}
}
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