How to insert text / characters from a custom button on a text toolbar

Question

Essentially, I want to add a button to the toolbar to allow the user to paste and copy; to a text editor ( http://textangular.com/ ), however, I had problems understanding how to add functionality to my button after registering it ... Since all examples of user functions on a text site use the same "wrapSelection" operator which has very minimal documentation, an example of this is shown below with a quote button.

    taRegisterTool('quote', {
    iconclass: 'fa fa-quote-right',
    tooltiptext: taTranslations.quote.tooltip,
    action: function(){
        return this.$editor().wrapSelection("formatBlock", "<BLOCKQUOTE>");
    },
    activeState: function(){ return this.$editor().queryFormatBlockState('blockquote'); }
});

I am confused as to where the "formatBlock" is initialized, and I believe that finding its source will help me with this problem. As you can see, any help would be appreciated

    taRegisterTool('insertCopyright', {
        buttontext: '©',
        tooltiptext: taTranslations.insertCopyright.tooltip,
        action: function () {
            //???
       },
    });

Answer 1

, , - , , "insertTextAtCursor" "moveCaret" , .

    taRegisterTool('insertCopyright', {
            buttontext: '©',
            tooltiptext: taTranslations.insertCopyright.tooltip,
            action: function() {
                function insertTextAtCursor(text) {
                    var sel, range;
                    if (window.getSelection) {
                        sel = window.getSelection();
                        if (sel.getRangeAt && sel.rangeCount) {
                            range = sel.getRangeAt(0);
                            range.deleteContents();
                            range.insertNode(document.createTextNode(text));
                        }
                    } else if (document.selection && document.selection.createRange) {
                        document.selection.createRange().text = text;
                    }
                }

                function moveCaret(charCount) {
                    var sel, range;
                    if (window.getSelection) {
                        sel = window.getSelection();
                        if (sel.rangeCount > 0) {
                            var textNode = sel.focusNode;
                            sel.collapse(textNode.nextSibling, charCount);
                        }
                    } else if ((sel = window.document.selection)) {
                        if (sel.type != "Control") {
                            range = sel.createRange();
                            range.move("character", charCount);
                            range.select();
                        }
                    }
                }

                insertTextAtCursor(String.fromCharCode(169));
                return moveCaret(1);
            },
        });