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Ajax combined with php to implement secondary linkage instance method
- 小云云Original
- 2018-01-12 16:26:131374browse
This article mainly introduces Ajax combined with PHP to achieve secondary linkage in detail. It has certain reference value. Interested friends can refer to it. I hope it can help everyone.
Use ajax to get data from php
<!DOCTYPE html>
<html>
<head>
<title>Ajax案例一</title>
<meta charset="utf-8" />
</head>
<body>
<!-- 二级联动 -->
<select id="province">
<option>请选择</option>
<option>山东省</option>
<option>辽宁省</option>
<option>吉林省</option>
</select>
<select id="city">
<option>请选择</option>
</select>
<script>
// 1. 为<select>元素绑定onchange事件
var provinceEle = document.getElementById("province");
provinceEle.onchange = function(){
// 将id为city的元素内容清空
var city = document.getElementById("city");
var opts = city.getElementsByTagName("option");
for(var z=opts.length-1;z>0;z--){
city.removeChild(opts[z]);
}
// 2. 获取用户当前选择的省份名称
var province = provinceEle.value;
// 3. 创建对应的城市列表 - 数组
var cities = [];
switch (province){
case "山东省":
cities = ["青岛市","济南市","威海市","日照市","德州市"];
break;
case "吉林省":
cities = ["长春市","松原市","吉林市","通化市","四平市"];
break;
case "辽宁省":
cities = ["沈阳市","大连市","铁岭市","丹东市","锦州市"];
break;
}
// 遍历城市列表
for(var i=0;i<cities.length;i++){
// 4. 创建<option>元素
var option = document.createElement("option");
// 5. 将城市的信息添加到<option>元素上
var textNode = document.createTextNode(cities[i]);
option.appendChild(textNode);
// 6. 将创建的所有<option>元素添加到id为city元素上
city.appendChild(option);
}
}
</script>
</body>
</html>php:
<?php
// 用于处理客户端请求二级联动的数据
// 1. 接收客户端发送的省份信息
$province = $_POST['provcince'];
// 2. 判断当前的省份信息,提供不同的城市信息
switch ($province){
case '山东省':
echo '青岛市,济南市,威海市,日照市,德州市';
break;
case '辽宁省':
echo '沈阳市,大连市,铁岭市,丹东市,锦州市';
break;
case '吉林省':
echo '长春市,松原市,吉林市,通化市,四平市';
break;
}
// 服务器端响应的是字符串
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