如何在jQuery datepicker中获取所选月份的最后一天？

Question

I want to get the last day of the selected month in jquery datepicker on onSelect 我想在onSelect jquery datepicker中获取selected月份的最后一天

My current code is written below: 我当前的代码如下：

  var j = jQuery.noConflict();
  j('.epo-field-date').datepicker({
    dateFormat: "yy-mm-dd",
    minDate: 0,
    maxDate: '1m',
    firstDay: 1,
    onSelect: function(dateText, inst, dateob) {

      var chosen_month = j.datepicker._defaults.monthNames[inst.selectedMonth];
      var chosen_day = date_selected_parts[2];

      j('.chosen-month .month').text(chosen_month);


    }
  });

For example, When I click any day in the month of January, I should be able to return the value 31 or depending on the last day of the selected day of the month. 例如，当我单击一月中的任何一天时，我应该能够返回值31或取决于该月所选日期的最后一天。

Any help is greatly appreciated. 任何帮助是极大的赞赏。

Answer 1

You can use $(this).datepicker('getDate'); 您可以使用$(this).datepicker('getDate'); within the onSelect event to get the selected date as a JavaScript Date . 在onSelect事件中获取选定的日期作为JavaScript Date 。

To get the last day of the month, you can actually advance the month by 1 , and set the day of the month to 0 . 要获得该月的最后一天，您实际上可以使该月提前1 ，并将该月的某天设置为0 。

For example, if you wanted the last day in December, JavaScript allows you to fetch the day before January 1 by getting January 0 . 例如，如果想要12月的最后一天，JavaScript允许您通过获取January 0来获取January 0 January 1日之前的January 1 。

var j = jQuery.noConflict();
j('.epo-field-date').datepicker({
  dateFormat: "yy-mm-dd",
  minDate: 0,
  maxDate: '1m',
  firstDay: 1,
  onSelect: function(dateText, inst, dateob) {

    var selectedDate = $(this).datepicker('getDate');
    var selectedMonth = selectedDate.getMonth();
    var selectedYear = selectedDate.getFullYear();

    var lastDate = new Date(selectedYear, selectedMonth + 1, 0);
    var lastDay = lastDate.getDate();

    //Do something with lastDay

  }
});

An example using today's date: 使用今天的日期的示例：

 var today = new Date(); var month = today.getMonth(); var year = today.getFullYear(); var lastDate = new Date(year, month + 1, 0); var lastDay = lastDate.getDate(); console.log("Last day of the month:", lastDate.toLocaleString()); console.log("Date as number:", lastDay);

Answer 2

Very simple, You can get selected year, month and create new date to get last date as following code below. 很简单，您可以选择以下年份中的年，月并创建新日期以获取最后日期。

Here sample code for your reference: 下面是示例代码，供您参考：

<!DOCTYPE html>
<html>
<body>

 <h2>JavaScript new Date()</h2>

 <p id="demo"></p>

 <script>
 var date = new Date();
 var firstDay = new Date(date.getFullYear(), date.getMonth(), 1);
 var lastDay = new Date(date.getFullYear(), date.getMonth() + 1, 0);

 document.getElementById("demo").innerHTML = lastDay;
 </script>

 </body>
 </html>

如何在jQuery datepicker中获取所选月份的最后一天？

问题描述

2 个解决方案

解决方案1
1 已采纳 2018-12-06 05:09:42

解决方案2
1 2018-12-06 05:17:50

如何在jQuery datepicker中获取所选月份的最后一天？

问题描述

2 个解决方案

解决方案1 1 已采纳 2018-12-06 05:09:42

解决方案2 1 2018-12-06 05:17:50

解决方案1
1 已采纳 2018-12-06 05:09:42

解决方案2
1 2018-12-06 05:17:50