Question

{
 "id":1,
 "name":"Jack",
 "date":"01-06-2017"
},
{
 "id":2,
 "name":"Allen",
 "date":"07-08-2017"
},
{
 "id":3,
 "name":"Annie",
 "date":"22-11-2017"
},

存储在'members'数组中的这个JSON我希望根据开始和结束日期过滤成员，如：

 let startDate;
 let endDate;
 let selectedMembers = this.members.filter(m => m.date > startDate && m.date < endDate);

类似的东西..

Answer 1

首先需要将日期从字符串转换为日期类型，以便正确比较它们，然后执行以下操作：

let members: any[] = [{
        "id": 1,
        "name": "Jack",
        "date": "01-06-2017" // this should be of object Date()
    },
    {
        "id": 2,
        "name": "Allen",
        "date": "07-08-2017" // this should be of object Date()
    },
    {
        "id": 3,
        "name": "Annie",
        "date": "22-11-2017" // this should be of object Date()
        }];

    let start = "01-02-2017;  // this should be of object Date()
    let end = "06-07-2017"; // this should be of object Date()

        let selectedMembers = members.filter(m => {
          if ( m.date > start && m.date < end) // or you can cast here to Date()
            return m;
    });

    console.log(selectedMembers);

Answer 2

要对存储为字符串的日期进行排序，您应该使用基于ISO的格式： https://es.wikipedia.org/wiki/ISO_8601

你写的这行将使用这样的日期：

{  "id":1,  "name":"Jack",  "date":"2017-06-01" }, 
{  "id":2,  "name":"Allen",  "date":"2017-08-07" }, 
{  "id":3,  "name":"Annie",  "date":"2017-11-22" }

如果没有，则必须将字符串解析为date对象并在比较中使用它们。像这样：

let startDate = new Date('2017-05-01');
 let endDate = new Date('2017-09-01);
 let selectedMembers = this.members.filter(m => new Date(m.date) > startDate && new Date(m.date) < endDate);

Answer 3

您需要撤消日期格式，然后将其转换为 TIMESTAMP 进行比较。

＆＃13;

members = [{
 "id":1,
 "name":"Jack",
 "date":"01-06-2017"
},
{
 "id":2,
 "name":"Allen",
 "date":"07-08-2017"
},
{
 "id":3,
 "name":"Annie",
 "date":"22-11-2017"
}];

const startDate ="25-06-2017";
const  endDate = "10-11-2017";

// Here reverse the date format & then convert to TIMESTAMP
function reverseAndTimeStamp(dateString) {
const reverse = new Date(dateString.split("-").reverse().join("-"));
return reverse.getTime();
}
 // A simple array filter like what you did
 const  selectedMembers = members.filter(m => { 
 return reverseAndTimeStamp(m.date) > reverseAndTimeStamp(startDate) && reverseAndTimeStamp(m.date) < reverseAndTimeStamp(endDate)
 }
 );
 
  console.log(selectedMembers); // the result objects

＆＃13;

Answer 4

感谢大家帮助我的答案。这是我的问题的解决方案

{
 "id":1,
 "name":"Jack",
 "date":"01-06-2017"
},
{
 "id":2,
 "name":"Allen",
 "date":"07-08-2017"
},
{
 "id":3,
 "name":"Annie",
 "date":"22-11-2017"
},

let start = "01-02-2017;
let end = "06-07-2017";

let.selectedMembers = this.members.filter(
m => new Date(m.date) >= new Date(startDate) && new Date(m.date) <= new Date(endDate)
);

console.log(selectedMembers);

感谢您的所有答案，这有助于我弄清楚:) ..

Answer 5

因为你使用法语日期格式，你需要在字符串和Date对象之间建立自己的变换器。

然后你必须处理Date javascript对象和时间戳表示。

这样的事情会起作用。

function parseDate(input) {
  var parts = input.match(/(\d+)/g);
  // note parts[1]-1
  return new Date(parts[2], parts[1]-1, parts[0]).getTime();
}

let startDate = parseDate('01-06-2017');
let endDate = parseDate('01-06-2018');

let selectedMembers = this.members.filter(m => {
    const current = parseDate(m.date);
    return current > startDate && current < endDate;
});

Angular 2：如何在两个日期之间过滤记录？

5 个答案: