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React: Rendering based on date order

I have a form which renders and inserts a component into a timeline, but I can't figure out how to get it to render a new submission chronologically, so that it gets inserted in the correct order.

This is what I've been trying so far.

render() {
  return (
    <div className="timeline-container">
      <ul>
        {this.state.activities
          .sort((a, b) => a.date > b.date)
          .map((activity, i) => (
            <Activity
              key={i}
              data={activity}
              handleDelete={this.handleDelete}
            />
          ))}
      </ul>
    </div>
  );
}

And this is the Activity component:

<li>
  <span></span>
  <div className="activity-title">{this.state.activity.title}</div>
  <div className="activity-info">{this.state.activity.description}</div>
  <div className="activity-location">{this.state.activity.location}</div>
  <div className="activity-date">{this.state.activity.date.slice(0, 10)}</div>
  <button onClick={this.handleDelete.bind(this, this.state.activity.id)}>
    Delete
  </button>
</li>;

At the moment it is still automatically rendering when the form is submitted, but it isn't sorting them.

Solution

  • You should be using new Date(date).getTime() method to compare and sort. A best way to do is:

    .sort(
  (a, b) => new Date(a.date).getTime() - new Date(b.date).getTime()
)

    And with my dummy data I get this:

    preview

    I have added some more entries and here's a full code:

    const Activity = props => (
  <li>
    {props.data.title} (#{props.data.id}) ({props.data.date.split("T")[0]})
  </li>
);

class App extends React.Component {
  state = {
    activities: [
      {
        id: 1,
        trip_id: 5,
        title: "Activity 1",
        description: "Description 1",
        location: "Location 1",
        date: "2019-07-03T23:00:00.000Z",
        pending: null,
        created_at: "2019-07-28T17:49:40.269Z",
        updated_at: "2019-07-28T17:49:40.269Z"
      },
      {
        id: 2,
        trip_id: 5,
        title: "Activity 2",
        description: "Description 1",
        location: "Location 1",
        date: "2019-07-05T23:00:00.000Z",
        pending: null,
        created_at: "2019-07-28T17:49:40.269Z",
        updated_at: "2019-07-28T17:49:40.269Z"
      },
      {
        id: 3,
        trip_id: 5,
        title: "Activity 3",
        description: "Description 1",
        location: "Location 1",
        date: "2019-07-02T23:00:00.000Z",
        pending: null,
        created_at: "2019-07-28T17:49:40.269Z",
        updated_at: "2019-07-28T17:49:40.269Z"
      }
    ]
  };
  render() {
    return (
      <div className="timeline-container">
        <ul>
          {this.state.activities
            .sort(
              (a, b) => new Date(a.date).getTime() - new Date(b.date).getTime()
            )
            .map((activity, i) => (
              <Activity
                key={i}
                data={activity}
                handleDelete={this.handleDelete}
              />
            ))}
        </ul>
      </div>
    );
  }
}

    Here in this example, I have used more than one activity to show you how they are sorted by date.

    Demo: CodeSandbox