在angularjs中将生日转换为年龄 [英] Convert birthday to age in angularjs

问题描述

我想将所有用户的年龄显示到网格中.我正在从 facebook 读取数据.我没有将其存储在任何地方.

I want to display age of all my users to grid. I am reading data from facebook.I am not storing it at anywhere.

我显示的日期如下:

{{ friend.birthday }}

如何显示年龄而不显示生日.

How can i display age instead of displaying birthday.

是否可以创建过滤器而不是如何创建过滤器以及如何应用它.

if it is possible to create filters than how to create filter and how to apply it.

推荐答案

你可以实现一个功能:

控制器:

$scope.calculateAge = function calculateAge(birthday) { // birthday is a date
    var ageDifMs = Date.now() - birthday.getTime();
    var ageDate = new Date(ageDifMs); // miliseconds from epoch
    return Math.abs(ageDate.getUTCFullYear() - 1970);
}

HTML

{{ calculateAge(friend.birthday) }}

或过滤器:

app.filter('ageFilter', function() {
     function calculateAge(birthday) { // birthday is a date
         var ageDifMs = Date.now() - birthday.getTime();
         var ageDate = new Date(ageDifMs); // miliseconds from epoch
         return Math.abs(ageDate.getUTCFullYear() - 1970);
     }

     return function(birthdate) { 
           return calculateAge(birthdate);
     }; 
});

HTML

{{ friend.birthday | ageFilter }}

年龄算法取自这个 SO 答案.

如果年龄小于 1 岁，并且你想显示月份，你可以修改 ageFilter 来计算月份差异:

If the age is less than 1 year, and you want to show months, you can modify the ageFilter to calculate the month difference:

app.filter('ageFilter', function() {
     function calculateAge(birthday) { // birthday is a date
         var ageDifMs = Date.now() - birthday.getTime();
         var ageDate = new Date(ageDifMs); // miliseconds from epoch
         return Math.abs(ageDate.getUTCFullYear() - 1970);
     }
     function monthDiff(d1, d2) {
       if (d1 < d2){
        var months = d2.getMonth() - d1.getMonth();
        return months <= 0 ? 0 : months;
       }
       return 0;
     }       
     return function(birthdate) { 
           var age = calculateAge(birthdate);
           if (age == 0)
             return monthDiff(birthdate, new Date()) + ' months';
           return age;
     }; 
});

演示 Plunker - 年龄函数
演示 Plunker - 年龄过滤器
演示 Plunker - 月龄过滤器1 年

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