javascript – How to capitalize the first letter?

Question:

I have the function, and it works perfectly:

$.fn.capitalize = function() {
function isTRChar(key) {
    var trchar = [231, 246, 252, 287, 305, 351];
    for (var i = 0; i < trchar.length; i++) {
        if (trchar[i] == key) return true;
    }
    return false;
}

$.each(this, function() {

    var $this = $(this);
    if ($this.is('textarea') || $this.is('input:text')) {
        $this.on({
            keypress: function(event) {
                var pressedKey = event.charCode == undefined ? event.keyCode : event.charCode;
                var str = String.fromCharCode(pressedKey);
                if (pressedKey == 0) {
                    if (!isTRChar(pressedKey)) return;
                }

                this.value = this.value.replace(/\b[a-z]/gi, function($0) {
                    return $0.toUpperCase();
                });
                this.value = this.value.replace(/@([a-z])[\w\.]*\b/gi, function($0, $1) {
                    return $0.substring(0, 2).toUpperCase() + $0.substring(2).toLowerCase();
                });

                if (!this.createTextRange) {
                    var startpos = this.selectionStart;
                    var endpos = this.selectionEnd;
                    if (!$(this).attr('maxlength') ||
                        this.value.length - (endpos - startpos) < $(this).attr('maxlength')) {
                        this.setSelectionRange(startpos + 1, startpos + 1);
                    }
                }
            }
        });
    }
});
}

But it doesn't work with accents , cedilla and in proper names, the de or do are also capitalized.

Examples: (how it looks when typed)

Maria Fatima

Jose Gonçalves

How to fix this in this function?

Answer:

hello you can try this [edit]: sorry i hadn't even checked back just now.

function contains(str, search){
 if(str.indexOf(search) >= 0){
   return true;
 } else {
   return false;
 }
}
$.fn.capitalize = function(str) {
    $.each(this, function() {
        var split = this.value.split(' ');
        for (var i = 0, len = split.length; i < len; i++) {
            var verify = (split[len - 1] == "D" || split[len - 1] == "d") && (str == "e" || str == "E") || (str == "o" || str == "O");
            if (verify == false) {
                if ( contains(split[i], 'de') == false && contains(split[i], 'do') == false) {
		    //alert(split[i]);
                    split[i] = split[i].charAt(0).toUpperCase() + split[i].slice(1);
                }
            }
        }
        this.value = split.join(' ');
    });
    return this;
};
$("textarea").keypress(function(e) {
    var str = String.fromCharCode(e.which);
    $(this).capitalize(str);
});

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
 
 <textarea></textarea>