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纯JS省市区三级联动(代码实例)

关键词:纯JS省市区三级联动  阅读(1842) 赞(37)

[摘要]本文主要介绍如何使用纯JS实现省市区三级联动,与您分享。

不需要访问后台服务器端,不使用Ajax,无刷新,纯JS实现的省市区三级联动。

当省市区数据变动是只需调正js即可。

使用方法:

<!DOCTYPE html>
<html>
<head>
<title>大学IT网-纯JS省市区联动</title>
<script type="text/javascript" src="jsAddress.js"></script>
</head>
<body>
<div>
省:<select id="cmbProvince"></select>
市:<select id="cmbCity"></select>
区:<select id="cmbArea"></select>
<br /><br />
省:<select id="Select1"></select>
市:<select id="Select2"></select>
区:<select id="Select3"></select>
<script type="text/javascript">
addressInit('cmbProvince', 'cmbCity', 'cmbArea', '陕西', '宝鸡市', '金台区');
addressInit('Select1', 'Select2', 'Select3');
</script>
</div>
</body>
</html>

核心代码如下:

var addressInit = function(_cmbProvince, _cmbCity, _cmbArea, defaultProvince, defaultCity, defaultArea)
{
    var cmbProvince = document.getElementById(_cmbProvince);
    var cmbCity = document.getElementById(_cmbCity);
    var cmbArea = document.getElementById(_cmbArea);
     
    function cmbSelect(cmb, str)
    {
        for(var i=0; i<cmb.options.length; i++)
        {
            if(cmb.options[i].value == str)
            {
                cmb.selectedIndex = i;
                return;
            }
        }
    }
    function cmbAddOption(cmb, str, obj)
    {
        var option = document.createElement("OPTION");
        cmb.options.add(option);
        option.innerHTML = str;
        option.value = str;
        option.obj = obj;
    }
     
    function changeCity()
    {
        cmbArea.options.length = 0;
        if(cmbCity.selectedIndex == -1)return;
        var item = cmbCity.options[cmbCity.selectedIndex].obj;
        for(var i=0; i<item.areaList.length; i++)
        {
            cmbAddOption(cmbArea, item.areaList[i], null);
        }
        cmbSelect(cmbArea, defaultArea);
    }
    function changeProvince()
    {
        cmbCity.options.length = 0;
        cmbCity.onchange = null;
        if(cmbProvince.selectedIndex == -1)return;
        var item = cmbProvince.options[cmbProvince.selectedIndex].obj;
        for(var i=0; i<item.cityList.length; i++)
        {
            cmbAddOption(cmbCity, item.cityList[i].name, item.cityList[i]);
        }
        cmbSelect(cmbCity, defaultCity);
        changeCity();
        cmbCity.onchange = changeCity;
    }
     
    for(var i=0; i<provinceList.length; i++)
    {
        cmbAddOption(cmbProvince, provinceList[i].name, provinceList[i]);
    }
    cmbSelect(cmbProvince, defaultProvince);
    changeProvince();
    cmbProvince.onchange = changeProvince;
}
 
var provinceList = [
{name:'北京', cityList:[         
{name:'市辖区', areaList:['东城区','西城区','崇文区','宣武区','朝阳区','丰台区','石景山区','海淀区','门头沟区','房山区','通州区','顺义区','昌平区','大兴区','怀柔区','平谷区']},
{name:'县', areaList:['密云县','延庆县']}
]},
{name:'上海', cityList:[         
{name:'市辖区', areaList:['黄浦区','卢湾区','徐汇区','长宁区','静安区','普陀区','闸北区','虹口区','杨浦区','闵行区','宝山区','金山区','松江区','青浦区','南汇区','奉贤区']},   
{name:'县', areaList:['崇明县']}
]}
];
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