Validate that end date is greater than start date with jQuery

How do I check/validate in jQuery whether end date [textbox] is greater than start date [textbox]?

Solution 1:

Just expanding off fusions answer. this extension method works using the jQuery validate plugin. It will validate dates and numbers

jQuery.validator.addMethod("greaterThan", 
function(value, element, params) {

    if (!/Invalid|NaN/.test(new Date(value))) {
        return new Date(value) > new Date($(params).val());
    }

    return isNaN(value) && isNaN($(params).val()) 
        || (Number(value) > Number($(params).val())); 
},'Must be greater than {0}.');

To use it:

$("#EndDate").rules('add', { greaterThan: "#StartDate" });

or

$("form").validate({
    rules: {
        EndDate: { greaterThan: "#StartDate" }
    }
});

Solution 2:

var startDate = new Date($('#startDate').val());
var endDate = new Date($('#endDate').val());

if (startDate < endDate){
// Do something
}

That should do it I think

Solution 3:

Little late to the party but here is my part

Date.parse(fromDate) > Date.parse(toDate)

Here is the detail:

var from = $("#from").val();
var to = $("#to").val();

if(Date.parse(from) > Date.parse(to)){
   alert("Invalid Date Range");
}
else{
   alert("Valid date Range");
}

Solution 4:

Reference jquery.validate.js and jquery-1.2.6.js. Add a startDate class to your start date textbox. Add an endDate class to your end date textbox.

Add this script block to your page:-

<script type="text/javascript">
    $(document).ready(function() {
        $.validator.addMethod("endDate", function(value, element) {
            var startDate = $('.startDate').val();
            return Date.parse(startDate) <= Date.parse(value) || value == "";
        }, "* End date must be after start date");
        $('#formId').validate();
    });
</script>

Hope this helps :-)

Solution 5:

I was just tinkering with danteuno's answer and found that while good-intentioned, sadly it's broken on several browsers that are not IE. This is because IE will be quite strict about what it accepts as the argument to the Date constructor, but others will not. For example, Chrome 18 gives

> new Date("66")
  Sat Jan 01 1966 00:00:00 GMT+0200 (GTB Standard Time)

This causes the code to take the "compare dates" path and it all goes downhill from there (e.g. new Date("11") is greater than new Date("66") and this is obviously the opposite of the desired effect).

Therefore after consideration I modified the code to give priority to the "numbers" path over the "dates" path and validate that the input is indeed numeric with the excellent method provided in Validate decimal numbers in JavaScript - IsNumeric().

In the end, the code becomes:

$.validator.addMethod(
    "greaterThan",
    function(value, element, params) {
        var target = $(params).val();
        var isValueNumeric = !isNaN(parseFloat(value)) && isFinite(value);
        var isTargetNumeric = !isNaN(parseFloat(target)) && isFinite(target);
        if (isValueNumeric && isTargetNumeric) {
            return Number(value) > Number(target);
        }

        if (!/Invalid|NaN/.test(new Date(value))) {
            return new Date(value) > new Date(target);
        }

        return false;
    },
    'Must be greater than {0}.');