我直接把jquery datepicker的结构抄过来，类名也照搬。于是一个换肤的日历就诞生了。
<div ms-controller="datepicker">
<div id="ui-datepicker-div" class="ui-datepicker ui-widget ui-widget-content ui-helper-clearfix ui-corner-all" style="display:block">
<div class="ui-datepicker-header ui-widget-header ui-helper-clearfix ui-corner-all">
<a class="ui-datepicker-prev ui-corner-all" title="Prev"
ms-click="prevMonth"
ms-hover="ui-state-hover"
ms-hover-1="ui-datepicker-prev-hover"
>
<span class="ui-icon ui-icon-circle-triangle-w">Prev</span></a>
<a class="ui-datepicker-next ui-corner-all" title="Next"
ms-click="nextMonth"
ms-hover="ui-state-hover"
ms-hover-1="ui-datepicker-next-hover"
>
<span class="ui-icon ui-icon-circle-triangle-e">Next</span></a>
<div class="ui-datepicker-title">
<select ms-each-month="$months" ms-if="changeMonth" ms-model="currentMonth" >
<option value="{{month}}" ms-selected="currentMonth == month">{{month+1}}月</option>
</select>
<select ms-each-year="candidateYears" ms-if="changeYear" ms-model="currentYear" >
<option value="{{year}}" ms-selected="currentYear == year">{{year}}年</option>
</select>
{{title}}
</div>
</div>
<table class="ui-datepicker-calendar" >
<thead>
<tr ms-each-date="$weeks">
<th ms-class-ui-datepicker-week-end="$first">
<span title="星期{{date}}">{{date}}</span>
</th>
</tr>
</thead>
<tbody ms-each-week="currentWeeks" ms-click="selectDay">
<tr ms-each-day="week">
<td ms-class-ui-datepicker-other-month="Number(day.split('-')[1]) != currentMonth"
ms-class-ui-datepicker-week-end="$first || $last"
ms-class-ui-state-disabled="day.split('-')[3] == 1"
ms-class-ui-datepicker-unselectable="day.split('-')[3] == 1"
>
<a class="ui-state-default" ms-title='currentMonth' href="#"
ms-if="showOtherMonths || Number(day.split('-')[1]) == currentMonth"
ms-hover="ui-state-hover"
ms-class-ui-state-highlight="isToday"
>{{day.split('-')[2]}} </a>
</td>
</tbody>
</table>
<div class="ui-datepicker-buttonpane ui-widget-content" ms-if="showButtonPanel">
<button type="button" class="ui-datepicker-current ui-state-default ui-priority-secondary ui-corner-all"
ms-hover="ui-state-hover"
ms-click="backToday"
>Today</button>
<button type="button" class="ui-datepicker-close ui-state-default ui-priority-primary ui-corner-all"
ms-hover="ui-state-hover"
>Done</button>
</div>
</div>
<link rel="stylesheet" ms-href="http://code.jquery.com/ui/1.10.3/themes/{{theme}}/jquery-ui.css" >
<div><input type="radio" ms-model="changeMonth" />可选择月份</div>
<div><input type="radio" ms-model="changeYear" />可选择年份</div>
<div><input type="radio" ms-model="showButtonPanel" />显示按钮面板</div>
<div><input type="radio" ms-model="showOtherMonths" />显示其他月份的日期</div>
<div><select ms-model="theme">
<option value='start'>start</option>
<option value='smoothness'>smoothness</option>
<option value='flick'>flick</option>
<option value='sunny'>sunny</option>
<option value='excite-bike'>excite bike</option>
<option value='black-tie'>black tie</option>
<option value='trontastic'>trontastic</option>
<option value='swanky-purse'>swanky purse</option>
<option value='le-frog'>le frog</option>
<option value='blitzer'>blitzer</option>
<option value='dot-luv'>dot luv</option>
<option value='mint-choc'>mint-choc</option>
<option value='hot-sneaks'>hot sneaks</option>
<option value='south-street'> south street</option>
<option value='humanity'>humanity</option>
<option value='vader'>vader</option>
<option value='eggplant'>eggplant</option>
<option value='cupertino'>cupertino</option>
<option value='overcast'>overcast</option>
</select>你喜欢的皮肤</div>
<p>你选择的日期为 {{selectedDate | date('yyyy-MM-dd')}}</p>
</div>
上面的结构分两部分，最上的日历，下面的一些表单元素用于控制日历的配置。
avalon.ready(function() {
avalon.define("datepicker", function(vm) {
//配置
vm.changeYear = false
vm.changeMonth = false
vm.minDate = new Date(2013, 3, 25);
//vm.maxDate
vm.showOtherMonths = false;
vm.showButtonPanel = false;
//当前时间
vm.selectedDate = new Date;
vm.currentDate = new Date;
vm.currentMonth = vm.currentDate.getMonth();
vm.currentYear = vm.currentDate.getFullYear();
vm.currentWeeks = getWeeks(vm.currentDate);
//显示顶部的年份与月份
vm.title = {
get: function() {
var format = "";
if (!this.changeYear && this.changeMonth) {
format = "yyyy年";
} else if (this.changeYear && !this.changeMonth) {
format = "MMMM";
} else if (!this.changeYear && !this.changeMonth) {
format = "MMMM yyyy年";
}
return format && avalon.filters.date(this.currentDate, format);
}
};
//星期显示
vm.$weeks = "日一二三四五六".split("");
//月份下拉菜单
vm.$months = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]
//当月的日期
function isDisabled(time) {
var disabled = false;
if (vm.minDate) {
disabled = time < vm.minDate;
}
if (disabled && vm.maxDate) {
disabled = time > vm.maxDate;
}
return disabled - 0;
}
function getWeeks(cur) {
vm.currentDate = cur;
var year = cur.getFullYear();
var month = cur.getMonth();//得到今天是几月（0 ~ 11）
var date = cur.getDate(); //得到今天是几号 （1 ~ 31）
cur.setMonth(month + 1);//改为下一个月，
//由于日期是1 ~ 31， 0则是退到上一个月的最后一天，于是得到这个月的总天数
cur.setDate(0);
var num = cur.getDate();
var next = 6 - cur.getDay();
var dates = avalon.range(1, num + 1);
dates = dates.map(function(d) {
var time = new Date(year, month, d)
return [year, month, d, isDisabled(time)].join("-");
});
cur.setMonth(month);
cur.setDate(1);//得到当月的第一天
var prev = cur.getDay();//0 ~ 6
cur.setDate(date);//还原
for (var i = 0; i < prev; i++) {//补上上一个月的日期
cur = new Date(year, month, -1 * i)
dates.unshift([year, cur.getMonth(), cur.getDate(), isDisabled(cur)].join("-"))
}
for (var i = 0; i < next; i++) {//补上下一个月的日期
cur = new Date(year, month + 1, i + 1)
dates.push([year, cur.getMonth(), cur.getDate(), isDisabled(cur)].join("-"))
}
var ret = [];
while (dates.length) {//每行七个分组
ret.push(dates.splice(0, 7));
}
return ret;//一个三维数组
}
//取得当年的前后20年
function getYears() {
var y = vm.currentYear;
return avalon.range(y - 10, y + 10);
}
vm.candidateYears = getYears();
//点击事件
vm.theme = "start";
vm.nextMonth = function(e) {
e.preventDefault()
var d = vm.currentDate;
var m = d.getMonth();
d.setMonth(m + 1);
m = d.getMonth();
if (m === 0) {
var y = d.getFullYear();
vm.currentYear = y;
}
vm.currentMonth = m;
};
//点击事件
vm.prevMonth = function(e) {
e.preventDefault()
var d = vm.currentDate;
var m = d.getMonth();
d.setMonth(m - 1);
m = d.getMonth();
if (m === 11) {
var y = d.getFullYear();
vm.currentYear = y;
}
vm.currentMonth = m;
};
//侦听
vm.$watch("currentMonth", function(val) {
var d = vm.currentDate;
d.setMonth(val);
vm.currentWeeks = getWeeks(d);
vm.title = NaN;
});
vm.$watch("currentYear", function(val) {
var d = vm.currentDate;
d.setFullYear(val)
vm.currentWeeks = getWeeks(d);
vm.title = NaN;
});
//高亮当前选中的日期
vm.selectDay = function(e) {
var el = e.target;
e.preventDefault()
if (el.tagName === "A" && el.parentNode.tagName === "TD" && !/disabled/.test(el.className)) {
var d = el.$scope.day.split('-')
vm.selectedDate = new Date(d[0], d[1], d[2]);
}
};
//高亮今天的日期
var today = new Date;
var atoday = [today.getFullYear(), today.getMonth(), today.getDate()];
vm.isToday = function() {
var day = this.$scope.day;
return day.slice(0, day.lastIndexOf("-")) === atoday.join("-");
};
vm.backToday = function() {
vm.currentMonth = atoday[1];
vm.currentYear = atoday[0];
}
});
avalon.scan();
});
这个JS代码比起先前的更清晰，放弃使用$fire这个危险的操作，建议大家也不要用它。因为如果没有严格的值变动检测， 这很容易引起无限递归。 现在avalon已经完全重用现有的节点，不会像过去那样每次都清空然后又添加。因此性能更好。
可选择月份
可选择年份
显示按钮面板
显示其他月份的日期
选择你喜欢的皮肤（注：这些样式都受到博客园染指了）
你选择的日期为 {{selectedDate | date('yyyy-MM-dd')}}
所有JS代码不到150行，就能涵盖jquery ui datepicker（2000多行）的绝大多数功能。如果努力一点，把模板也封装一下，其他功能也跟进，最多也是500行的规模。可谓MVVM的威力。而且这样写JS，可读性非常好，思路不会像着jQuery那样跟着CSS表达式——“这个元素是在哪里，该添加类名还是移除类名……”
用了MVVM后，我们写代码的思路将是这个样子
- 先把HTML搞出来;
- 把重复的部分转换为一个each绑定，VM中对应一个数组;
- 把页面视情况要显示隐藏，要切换类名的东西，在VM中由一个布尔属性来控制;
- 事件回调里再来也不进行DOM操作，而是对这些数组进行shift, pop操作，布尔属性进行反转;
- 把这些逻辑封到一个VM中
- 最后对视图进行绑定