Question

How can I make a input field that automatically adds a dash after six digits.
Is should also only be possible to write numbers in the input field.

Can this be done using jQuery?

Answer 1

Borrowing code from this post: How to allow only numeric (0-9) in HTML inputbox using jQuery?

You can add a condition to capture length.

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
<script src="//ajax.googleapis.com/ajax/libs/jqueryui/1.9.0/jquery-ui.min.js"></script>

<script>
$(document).ready(function() {
    $("#txtboxToFilter").keydown(function(event) {
        // Allow: backspace, delete, tab, escape, and enter
        if ( event.keyCode == 46 || event.keyCode == 8 || event.keyCode == 9 || event.keyCode == 27 || event.keyCode == 13 || 
             // Allow: Ctrl+A
            (event.keyCode == 65 && event.ctrlKey === true) || 
             // Allow: home, end, left, right
            (event.keyCode >= 35 && event.keyCode <= 39)) {
                 return;
        }
        else {
            // Ensure that it is a number and stop the keypress
            if (event.shiftKey || (event.keyCode < 48 || event.keyCode > 57) && (event.keyCode < 96 || event.keyCode > 105 )) {   
                event.preventDefault(); 
            }   
        }

        if(  $("#txtboxToFilter").val().length == 6 )
       {
            event.target.value = event.target.value + "-";
       }
    });
});
</script>

<form>

<input type="text" id="txtboxToFilter">

</form>