又到了每日分享时间了，这次分享的内容为：jQuery三级联动效果代码（省、市、区）。
很长时间都不用jquery了，有人问我jquery写三级联动的插件我就写好了发出来吧，正好需要的人都可以看看。
效果图：
image.png
一、html代码
<!DOCTYPE html>
<html>
<head>
<title>三级联动-三人行慕课</title>
<link rel="stylesheet" type="text/css" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css">
</head>
<body>
<div data-toggle='distpicker' class='form-inline' id='distpicker'>
<select class="form-control" data-province="---- 选择省 ----"></select>
<select class="form-control" data-city="---- 选择市 ----"></select>
<select class="form-control" data-district="---- 选择区 ----"></select>
</div>
<script type="text/javascript" src='js/jquery.min.js'></script>
<script type="text/javascript" src='js/distpicker.data.js'></script>
<script type="text/javascript" src='js/distpicker.js'></script>
<script type="text/javascript">
$("#distpicker").distpicker({
placeholder: false,
autoSelect: false
});
</script>
</body>
</html>
二、上面的js引入大家看到了吗，首先引入jquery没什么好说的了，然后引入数据以及插件文件。
distpicker.data.js ： 内容是三级联动的数据（数据量特别大，查看地址：https://www.3mooc.com/front/couinfo/978
distpicker.js ： 插件本身代码：
/*!
* Distpicker v1.0.4
* https://github.com/fengyuanchen/distpicker
*
* Copyright (c) 2014-2016 Fengyuan Chen
* Released under the MIT license
*
* Date: 2016-06-01T15:05:52.606Z
*/
(function (factory) {
if (typeof define === 'function' && define.amd) {
// AMD. Register as anonymous module.
define(['jquery', 'ChineseDistricts'], factory);
} else if (typeof exports === 'object') {
// Node / CommonJS
factory(require('jquery'), require('ChineseDistricts'));
} else {
// Browser globals.
factory(jQuery, ChineseDistricts);
}
})(function ($, ChineseDistricts) {
'use strict';
if (typeof ChineseDistricts === 'undefined') {
throw new Error('The file "distpicker.data.js" must be included first!');
}
var NAMESPACE = 'distpicker';
var EVENT_CHANGE = 'change.' + NAMESPACE;
var PROVINCE = 'province';
var CIRY = 'city';
var DISTRICT = 'district';
function Distpicker(element, options) {
this.$element = $(element);
this.options = $.extend({}, Distpicker.DEFAULTS, $.isPlainObject(options) && options);
this.placeholders = $.extend({}, Distpicker.DEFAULTS);
this.active = false;
this.init();
}
Distpicker.prototype = {
constructor: Distpicker,
init: function () {
var options = this.options;
var $select = this.$element.find('select');
var length = $select.length;
var data = {};
$select.each(function () {
$.extend(data, $(this).data());
});
$.each([PROVINCE, CIRY, DISTRICT], $.proxy(function (i, type) {
if (data[type]) {
options[type] = data[type];
this['$' + type] = $select.filter('[data-' + type + ']');
} else {
this['$' + type] = length > i ? $select.eq(i) : null;
}
}, this));
this.bind();
// Reset all the selects (after event binding)
this.reset();
this.active = true;
},
bind: function () {
if (this.$province) {
this.$province.on(EVENT_CHANGE, (this._changeProvince = $.proxy(function () {
this.output(CIRY);
this.output(DISTRICT);
}, this)));
}
if (this.$city) {
this.$city.on(EVENT_CHANGE, (this._changeCity = $.proxy(function () {
this.output(DISTRICT);
}, this)));
}
},
unbind: function () {
if (this.$province) {
this.$province.off(EVENT_CHANGE, this._changeProvince);
}
if (this.$city) {
this.$city.off(EVENT_CHANGE, this._changeCity);
}
},
output: function (type) {
var options = this.options;
var placeholders = this.placeholders;
var $select = this['$' + type];
var districts = {};
var data = [];
var code;
var matched;
var value;
if (!$select || !$select.length) {
return;
}
value = options[type];
code = (
type === PROVINCE ? 86 :
type === CIRY ? this.$province && this.$province.find(':selected').data('code') :
type === DISTRICT ? this.$city && this.$city.find(':selected').data('code') : code
);
districts = $.isNumeric(code) ? ChineseDistricts[code] : null;
if ($.isPlainObject(districts)) {
$.each(districts, function (code, address) {
var selected = address === value;
if (selected) {
matched = true;
}
data.push({
code: code,
address: address,
selected: selected
});
});
}
if (!matched) {
if (data.length && (options.autoSelect || options.autoselect)) {
data[0].selected = true;
}
// Save the unmatched value as a placeholder at the first output
if (!this.active && value) {
placeholders[type] = value;
}
}
// Add placeholder option
if (options.placeholder) {
data.unshift({
code: '',
address: placeholders[type],
selected: false
});
}
$select.html(this.getList(data));
},
getList: function (data) {
var list = [];
$.each(data, function (i, n) {
list.push(
'<option' +
' value="' + (n.address && n.code ? n.address : '') + '"' +
' data-code="' + (n.code || '') + '"' +
(n.selected ? ' selected' : '') +
'>' +
(n.address || '') +
'</option>'
);
});
return list.join('');
},
reset: function (deep) {
if (!deep) {
this.output(PROVINCE);
this.output(CIRY);
this.output(DISTRICT);
} else if (this.$province) {
this.$province.find(':first').prop('selected', true).trigger(EVENT_CHANGE);
}
},
destroy: function () {
this.unbind();
this.$element.removeData(NAMESPACE);
}
};
Distpicker.DEFAULTS = {
autoSelect: true,
placeholder: true,
province: '—— 省 ——',
city: '—— 市 ——',
district: '—— 区 ——'
};
Distpicker.setDefaults = function (options) {
$.extend(Distpicker.DEFAULTS, options);
};
// Save the other distpicker
Distpicker.other = $.fn.distpicker;
// Register as jQuery plugin
$.fn.distpicker = function (option) {
var args = [].slice.call(arguments, 1);
return this.each(function () {
var $this = $(this);
var data = $this.data(NAMESPACE);
var options;
var fn;
if (!data) {
if (/destroy/.test(option)) {
return;
}
options = $.extend({}, $this.data(), $.isPlainObject(option) && option);
$this.data(NAMESPACE, (data = new Distpicker(this, options)));
}
if (typeof option === 'string' && $.isFunction(fn = data[option])) {
fn.apply(data, args);
}
});
};
$.fn.distpicker.Constructor = Distpicker;
$.fn.distpicker.setDefaults = Distpicker.setDefaults;
// No conflict
$.fn.distpicker.noConflict = function () {
$.fn.distpicker = Distpicker.other;
return this;
};
$(function () {
$('[data-toggle="distpicker"]').distpicker();
});
});
老规矩，教学视频连接：https://www.3mooc.com/front/couinfo/978
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