I've already searched the internet and right here on the site, but I could not find any clean and working way to do that.
I need JS to compare the date in the field (which will be in a DD / MM / YYYY format) and compare with the current date if the date indicated is greater than the current date of an alert.
You can convert your date from String to Date and compare with the operator:
var strData = "28/02/2015";
var partesData = strData.split("/");
var data = new Date(partesData[2], partesData[1] - 1, partesData[0]);
if(data > new Date())
alert("maior");
Remarks :
In Javascript, instantiating a new object Date with the empty constructor ( new Date() ) results in an object representing the current date / time.
The second parameter of the constructor of class Date is the month, which is indexed from 0 to 11. Therefore, you must subtract 1 from the date value in string.
I believe that if you invert the order JavaScript already parse:
.split('/').reverse().join('/');
var str = "28/02/2020";
var date = new Date(str.split('/').reverse().join('/'));
var novaData = new Date();
if(date > novaData) alert("Essa data ainda não chegou!");
Although they have already replied, use another isAfter() of Momentjs which is a Javascript library for handling and handling dates.
// 12/05/2015 é depois de 01/05/2015?
if(moment('2015-05-12').isAfter('2015-05-01'))
alert("Yep!");<script src='http://momentjs.com/downloads/moment.min.js'></script>