将回调添加到jQuery DatePicker的正确方法 [英] Proper way to add a callback to jQuery DatePicker

问题描述

DatePicker有一个内部函数， _adjustDate（），我想在之后添加一个回调。

DatePicker has an internal function, _adjustDate(), which I'd like to add a callback after.

这就是我目前的做法。基本上，只需用自身替换功能定义，再加上新操作。这会影响所有日期选择器，我也不确定是否需要。

This is how I'm currently doing this. Basically, just replacing the function defintion with itself, plus the new operations. This effects all datepickers, which I'm not sure is desired, either.

$(function(){

   var old = $.datepicker._adjustdate;

   $.datepicker._adjustDate = function(){
      old.apply(this, arguments);

      // custom callback here     
      console.log('callback');
   };

});

_adjustDate是在下一个/上个月点击期间调用的内容。该函数有三个参数。我很好奇是否有更好的方法来添加回调。

_adjustDate is what's called during the next/prev month clicks. The function takes three parameters. I'm curious if there's a better way to add the callback.

我希望最终结果如下所示;其中 afterAjustDate 是回调句柄：

I'd like to have the end result look like this; where afterAjustDate is the callback handle:

$('#datepicker').datepicker({ 
       showButtonPanel: true
     , afterAdjustDate: function(){ $(this).find('foo').addClass('bar'); }
});

onChangeMonthYear 不是可接受的事件替代方案， live（） / delegate（）（在IE中不起作用）绑定选项。

onChangeMonthYear is not an acceptable event alternative, neither are the live()/delegate() (don't work in IE) binding options.

这来自于选择月份后应用类/操作元素的需要。更改月份会重新创建日历中的元素;执行此操作时，jQueryUI不够智能，无法继承类更改。因此，我需要在更改日期后进行回调。

This comes from the need of applying classes/manipulating elements after the month is selected. Changing the month recreates elements in the calendar; when this is performed jQueryUI is not smart enough to inherit the class changes. Thus, I need a callback after changing the date.

推荐答案

我写了一个小型演示来做到这一点......

I wrote a small demo that does this...

我创建了一个包含$ .datepicker扩展名的对象文字，然后在$ .datepicker和我的对象上执行$ .extend。

I create an object literal that contains the extensions to $.datepicker and then do $.extend on $.datepicker and my object.

您可以在此处查看： http://jsfiddle.net/NHN4g/4/

这是扩展本身：

(function($){
    var datepickerExtensions = {
        _oldAdjustDate: $.datepicker._adjustDate,
        _adjustDate: function(id, offset, period) { 
            var target = $(id);
            var inst = this._getInst(target[0]);
            var afterAdjustDate = this._get(inst, 'afterAdjustDate');
            this._oldAdjustDate(id, offset, period);
            if(afterAdjustDate && typeof afterAdjustDate === 'function'){
                afterAdjustDate(id, offset, period);
            }
        }
    }
    $.extend($.datepicker, datepickerExtensions);
})(jQuery);

以及演示：

（html ）

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.16/themes/base/jquery-ui.css" type="text/css" media="all">
<div class="demo">
    <p>Date: <input type="text" id="datepicker"></p>
</div><!-- End demo -->

（javascript）

(javascript)

var changed = false;
$("#datepicker").datepicker({ 
    afterAdjustDate: function(i,o,p){
        if(!changed){
            $('.ui-datepicker-month').css('color', '#f00');
        }
        changed = !changed;
    }
});

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