Placing an Ajax array within a date selection tool

While the community has been helpful with my project, I still need a bit more assistance. Specifically, I'm trying to insert an Ajax array into a Javascript date range picker from a MySQL database, but it's not functioning as expected. Below is the code I am working with:

file #1 getdaterangepicker.php

   <?php
include 'dbconfig.php';

$sql="SELECT start_date, end_date FROM date_ranges ";
$result = mysqli_query($conn,$sql);

// Initialize empty array.
$date_ranges = array();

// Populate the array.
while($row = mysqli_fetch_array($result)) {
    
    // Create an associative array to hold the values.
    array_push($date_ranges, array(
        'start'   => $row['start_date'],
        'end'     => $row['end_date']
    ));

    mysqli_close($conn);

} 

// Convert $date_ranges to JSON format.
$json = json_encode($date_ranges); // '[{"start": "2019-08-18", "end": "2019-08-19"}]'
echo $json;
?>

file 2 index.php:

// AJAX request function.
// Use this function to retrieve dates from the server.
function getDateRanges(callback) {
    $.ajax({
        url: 'getdaterangepicker.php',       
        method: 'GET',                 
        dataType: 'html',              
        success: function(response) {  
            if (response) {            
                callback(response);    
            }
        },
        error: function(jqXHR, textStatus, errorThrown) {
            console.log(textStatus + ': ' + errorThrown);
        }
    });
}
getDateRanges(function(dates) {

    $('input[name="start_date"]').daterangepicker({
        autoUpdateInput: false,
        locale: {
            cancelLabel: 'Clear'
        },
        isInvalidDate: function(date) {
            var dateRanges = [dates];
                        console.log(dates);
            return dateRanges.reduce(function(bool, range) {
                return bool || (date >= moment(range.start) && date <= moment(range.end)); 
            }, false);
        }
    });

    $('input[name="start_date"]').on('apply.daterangepicker', function(ev, picker) {
        document.getElementById("start_date").value = picker.startDate.format('MM/DD/YYYY');
        document.getElementById("end_date").value = picker.endDate.format('MM/DD/YYYY');
    });

    $('input[name="datefilter"]').on('cancel.daterangepicker', function(ev, picker) {
        $(this).val('');
    });

});

The javascript console displays the correct array (

[{"start":"2019-08-20","end":"2019-08-25"}]
), but the date picker isn't excluding the invalid dates. Strangely though, manually substituting var dateRanges = [dates]; with
var dateRanges = [{"start": "2019-08-25", "end": "2019-08-31"}];
makes it work flawlessly. Any suggestions on why this might be happening? The date range picker in use can be found at:

Answer №1

There are a couple of issues that need to be addressed. Firstly, the main issue lies in the fact that the dataType specified in your ajax request is set to html instead of json. This results in the variable dates being treated as a string. By correcting this error and setting dataType to json, dates will be recognized as an array, allowing you to directly assign it to dateRanges without any additional nesting, like so:

var dateRanges = dates;

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