如何获取日期输入的值并将其保存到全局变量？

Question

I got the value of the date input field but now I want to take that value and put it into a global variable. How do I do that?

const moment = require("moment");

//current Date
let date = moment().format("YYYY-MM-DD");

//selecting input date
let datepick = document.getElementById("datepicker");

//setting value of date input to current date
datepick.value = date;

//global variable to save the new selected value of the input date field
let selectedDate;

//getting the value on change of the input date field
document.getElementById("datepicker").addEventListener("change", function() {
  var selectedDate = this.value;
});

Answer 1

You have the global newSelectedDate variable. You should use that variable instead of selectedDate .

Now do keep in mind that the newSelectedDate is initially undefined , so logging it instantly won't return a value. Only after the change event has occurred will the newSelectedDate have a value.

let newSelectedDate; // undefined

document.getElementById("datepicker").addEventListener("change", function() {
  newSelectedDate = this.value; // Update newSelectedDate value.
  console.log(newSelectedDate) // Now has a string.
});