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省市区三级联动

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="./asset/bootstrap/dist/css/bootstrap.min.css">
    <script src="./js/ajax.js"></script>
    <script src="./js/template-web.js"></script>
</head>

<body>
    <div class="container">
        <div class="form-inline">
            <div class="form-group">
                <select class="form-control" id="province">
                
                </select>
            </div>
            <div class="form-group">
                <select class="form-control" id="city">
                    <option>请选择城市</option>
                </select>
            </div>
            <div class="form-group">
                <select class="form-control" id="area">
                    <option>请选择县城</option>
                </select>
            </div>
        </div>
    </div>
    <script type="text/html" id="protpl">
        <option>请选择省份</option>
        {{each province}}
        <option value={{$value.id}}>{{$value.name}}</option>
        {{/each}}
    </script>
    <script type="text/html" id="citytpl">
        <option>请选择城市</option>
        {{each city}}
        <option value={{$value.id}}>{{$value.name}}</option>
        {{/each}}
    </script>
    <script type="text/html" id="areatpl">
        <option>请选择县城</option>
        {{each area}}
        <option value={{$value.id}}>{{$value.name}}</option>
        {{/each}}
    </script>
    <script>
        var province = document.querySelector('#province')
        var city = document.querySelector('#city')
        var area = document.querySelector('#area')
        ajax({
            type: 'get',
            url: 'http://localhost:3001/province',
            success: function(data) {
                console.log(data)
                var html = template('protpl', {
                    province: data
                })
                province.innerHTML = html
            },
            error: function() {}
        })
        province.onchange = function() {
            var pid = this.value
            var html = template('areatpl', {
                area: []
            })
            area.innerHTML = html
            ajax({
                type: 'get',
                url: 'http://localhost:3001/cities',
                data: {
                    id: pid
                },
                success: function(data) {
                    console.log(data)
                    var html = template('citytpl', {
                        city: data
                    })
                    city.innerHTML = html
                },
                error: function() {}
            })
        }
        city.onchange = function() {
            var cid = this.value
            ajax({
                type: 'get',
                url: 'http://localhost:3001/areas',
                data: {
                    id: cid
                },
                success: function(data) {
                    console.log(data)
                    var html = template('areatpl', {
                        area: data
                    })
                    area.innerHTML = html
                },
                error: function() {}
            })
        }
    </script>
</body>

</html>

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原文地址：https://www.cnblogs.com/rainbowupdate/p/13052390.html