Working with Text Formatting in React DocumentEditor component

//Gets the value for bold formatting of selected text.
let bold : boolean = documenteditor.selection.characterFormat.bold;
//Sets bold formatting for selected text.
documenteditor.selection.characterFormat.bold = true;

import * as ReactDOM from 'react-dom';
import * as React from 'react';
import { DocumentEditorComponent, Selection, Editor, EditorHistory, ContextMenu } from '@syncfusion/ej2-react-documenteditor';
import { ToolbarComponent, ItemDirective, ItemsDirective } from '@syncfusion/ej2-react-navigations';
import { ComboBoxComponent } from '@syncfusion/ej2-react-dropdowns';
import { ColorPickerComponent } from '@syncfusion/ej2-react-inputs';

DocumentEditorComponent.Inject(Selection, Editor, EditorHistory, ContextMenu);

export class Default extends React.Component<{}, {}> {
    public documenteditor: DocumentEditorComponent;

    public componentDidMount(): void {
        this.documenteditor.selectionChange = () => {
            setTimeout(() => { this.onSelectionChange(); }, 20);
        };
    }

    toolbarButtonClick(arg): void {
        switch (arg.item.id) {
            case 'bold':
                //Toggles the bold of selected content
                this.documenteditor.editor.toggleBold();
                break;
            case 'italic':
                //Toggles the Italic of selected content
                this.documenteditor.editor.toggleItalic();
                break;
            case 'underline':
                //Toggles the underline of selected content
                this.documenteditor.editor.toggleUnderline('Single');
                break;
            case 'strikethrough':
                //Toggles the strikethrough of selected content
                this.documenteditor.editor.toggleStrikethrough();
                break;
            case 'subscript':
                //Toggles the subscript of selected content
                this.documenteditor.editor.toggleSubscript();
                break;
            case 'superscript':
                //Toggles the superscript of selected content
                this.documenteditor.editor.toggleSuperscript();
                break;
        }
    }
    //To change the font Style of selected content
    public changeFontFamily(args): void {
        this.documenteditor.selection.characterFormat.fontFamily = args.value;
        this.documenteditor.focusIn();
    }
    //To Change the font Size of selected content
    public changeFontSize(args): void {
        this.documenteditor.selection.characterFormat.fontSize = args.value;
        this.documenteditor.focusIn();
    }
    //To Change the font Color of selected content
    public changeFontColor(args) {
        this.documenteditor.selection.characterFormat.fontColor = args.currentValue.hex;
        this.documenteditor.focusIn();
    }

    //Selection change to retrieve formatting
    public onSelectionChange(): void {
        if (this.documenteditor.selection) {
            this.enableDisableFontOptions();
            // #endregion
        }
    }
    public enableDisableFontOptions(): void {
        var characterformat = this.documenteditor.selection.characterFormat;
        var properties = [characterformat.bold, characterformat.italic, characterformat.underline, characterformat.strikeThrough];
        var toggleBtnId = ["bold", "italic", "underline", "strikethrough"];
        for (let i = 0; i < properties.length; i++) {
            this.changeActiveState(properties[i], toggleBtnId[i]);
        }
    }
    public changeActiveState(property, btnId): void {
        let toggleBtn: HTMLElement = document.getElementById(btnId);
        if ((typeof (property) == 'boolean' && property == true) || (typeof (property) == 'string' && property !== 'None'))
            toggleBtn.classList.add("e-btn-toggle");
        else {
            if (toggleBtn.classList.contains("e-btn-toggle"))
                toggleBtn.classList.remove("e-btn-toggle");
        }
    }
    private fontStyle: string[] = ['Algerian', 'Arial', 'Calibri', 'Cambria', 'Cambria Math', 'Candara', 'Courier New', 'Georgia', 'Impact', 'Segoe Print', 'Segoe Script', 'Segoe UI', 'Symbol', 'Times New Roman', 'Verdana', 'Windings'
    ];
    private fontSize: string[] = ['8', '9', '10', '11', '12', '14', '16', '18',
        '20', '22', '24', '26', '28', '36', '48', '72', '96'];
    public contentTemplate1() {
        return (<ColorPickerComponent showButtons={true} value='#000000' change={this.changeFontColor.bind(this)}></ColorPickerComponent>);
    }
    public contentTemplate2() {
        return (<ComboBoxComponent dataSource={this.fontStyle} change={this.changeFontFamily.bind(this)} index={2} allowCustom={true} showClearButton={false} ></ComboBoxComponent>);
    }
    public contentTemplate3() {
        return (<ComboBoxComponent dataSource={this.fontSize} change={this.changeFontSize.bind(this)} index={2} allowCustom={true} showClearButton={false} ></ComboBoxComponent>);
    }
    render() {
        return (
            <div>
                <ToolbarComponent id='toolbar' clicked={this.toolbarButtonClick.bind(this)}>
                    <ItemsDirective>
                        <ItemDirective id="bold" prefixIcon="e-de-icon-Bold" tooltipText="Bold" />
                        <ItemDirective id="italic" prefixIcon="e-de-icon-Italic" tooltipText="Italic" />
                        <ItemDirective id="underline" prefixIcon="e-de-icon-Underline" tooltipText="Underline" />
                        <ItemDirective id="strikethrough" prefixIcon="e-de-icon-Strikethrough" tooltipText="Strikethrough" />
                        <ItemDirective id="subscript" prefixIcon="e-de-icon-Subscript" tooltipText="Subscript" />
                        <ItemDirective id="superscript" prefixIcon="e-de-icon-Superscript" tooltipText="Superscript" />
                        <ItemDirective type="Separator" />
                        <ItemDirective template={this.contentTemplate1} />
                        <ItemDirective type="Separator" />
                        <ItemDirective template={this.contentTemplate2} />
                        <ItemDirective template={this.contentTemplate3} />
                    </ItemsDirective>
                </ToolbarComponent>

                <DocumentEditorComponent
                    id="container"
                    height={'330px'}
                    ref={scope => {
                        this.documenteditor = scope;
                    }}
                    isReadOnly={false}
                    enableSelection={true}
                    enableEditor={true}
                    enableEditorHistory={true}
                    enableContextMenu={true}
                />
            </div>
        );
    }
}
ReactDOM.render(<Default />, document.getElementById('sample'));