DATETIME CONTROL WITH LOSTFOCUS: ASP.NET CORE MVC

The issue you're describing is likely due to the fact that the datetime control in your CSHTML file is not triggering an update or event until it loses focus (i.e., when you click outside of the control). To fix this, you need to ensure that the datetime control triggers an event (like change or input) as soon as the user selects a date and time.

Here’s how you can fix it:

1. Use JavaScript/jQuery to Trigger an Event on Change

You can use JavaScript or jQuery to listen for changes in the datetime control and trigger the desired action immediately.

Example with JavaScript:

html

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<input type="datetime-local" id="appointmentDateTime" onchange="handleDateTimeChange()" />

<script>
    function handleDateTimeChange() {
        // Your logic to flash out or update the UI
        const selectedDateTime = document.getElementById('appointmentDateTime').value;
        console.log('Selected Date and Time:', selectedDateTime);
        // Add your logic here to update the UI or perform other actions
    }
</script>

Run HTML

Example with jQuery:

html

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<input type="datetime-local" id="appointmentDateTime" />

<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script>
    $(document).ready(function() {
        $('#appointmentDateTime').on('input change', function() {
            const selectedDateTime = $(this).val();
            console.log('Selected Date and Time:', selectedDateTime);
            // Add your logic here to update the UI or perform other actions
        });
    });
</script>

Run HTML

2. Ensure the Control is Properly Bound

If you're using a framework like ASP.NET MVC or Razor Pages, ensure that the datetime control is properly bound to a model property. For example:

csharp

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@model YourNamespace.YourModel

<input type="datetime-local" asp-for="AppointmentDateTime" id="appointmentDateTime" />

3. Debugging Tips

• Ensure that the id or name attribute of the datetime control is correct and matches the JavaScript/jQuery selector.

• Check the browser console for any JavaScript errors that might prevent the script from running.

• If you're using a custom datetime picker library, refer to its documentation for proper event handling.

• 
  

4. Alternative: Use input Event

The input event fires immediately when the value of the datetime control changes, without waiting for the control to lose focus. This might be more suitable for your use case.

html

Copy

<input type="datetime-local" id="appointmentDateTime" />

<script>
    document.getElementById('appointmentDateTime').addEventListener('input', function() {
        const selectedDateTime = this.value;
        console.log('Selected Date and Time:', selectedDateTime);
        // Add your logic here to update the UI or perform other actions
    });
</script>

Run HTML

Summary

By adding an event listener for the input or change event, you can ensure that your logic runs as soon as the user selects a date and time, without requiring them to click outside the control. Use JavaScript or jQuery depending on your preference and existing codebase.