HTML Yazı Alanına Sadece Büyük Harf Yazdırmak

// HTML text field;
<input id="txtName" class="form-control uppercase-only" type="text" runat="server" />

// Vanilla JS Code;
<script type="text/javascript">
    
    var forceKeyPressUppercase = function(e) {
        var el = e.target;
        var charInput = e.keyCode;
        
        console.log("e.key", e.key);
        console.log("charInput", charInput);
        
        if (!e.ctrlKey && !e.metaKey && !e.altKey) { // no modifier key
            
            if (((charInput >= 97) && (charInput <= 122)) || (charInput == 305 || charInput == 287 || charInput == 252 || charInput == 351 || charInput == 231 || charInput == 246 || charInput == 105)) { // lowercase
            
                var newChar = charInput - 32;
                                
                switch(charInput)        // Turkish Chars;
                {
                    case 105:            // i
                    newChar = 304;        // İ
                    break;
                
                    case 305:            // ı
                    newChar = 73;        // I
                    break;
                    
                    case 287:            // ğ
                    newChar = 286;        // Ğ
                    break;
                    
                    case 252:            // ü
                    newChar = 220;        // Ü
                    break;
                    
                    case 351:            // ş
                    newChar = 350;        // Ş
                    break;
                    
                    case 231:            // ç
                    newChar = 199;        // Ç
                    break;
                    
                    case 246:            // ö
                    newChar = 214;        // Ö
                    break;
                    
                    default:
                    break;
                }
                
                var start = el.selectionStart;
                var end = el.selectionEnd;
                el.value = el.value.substring(0, start) + String.fromCharCode(newChar) + el.value.substring(end);
                el.setSelectionRange(start + 1, start + 1);
                e.preventDefault();
                
            }
        }
    };

    document.querySelectorAll(".uppercase-only").forEach(function (current) {
        current.addEventListener("keypress", forceKeyPressUppercase);
    });

</script>