Working with Paragraph Formatting in JavaScript DocumentEditor control

import { DocumentEditor, Editor, Selection, EditorHistory, SfdtExport, ContextMenu } from '@syncfusion/ej2-documenteditor';
import { Toolbar } from '@syncfusion/ej2-navigations';
import { ItemModel, DropDownButton } from '@syncfusion/ej2-splitbuttons';

//Inject the require module
DocumentEditor.Inject(Editor, Selection, EditorHistory, SfdtExport, ContextMenu);

let documenteditor: DocumentEditor = new DocumentEditor({
height: '370px', isReadOnly: false, enableSelection: true, enableEditorHistory: true, enableEditor: true, enableContextMenu: true, enableSfdtExport: true
});

function toolbarButtonClick(arg) {
switch (arg.item.id) {
    case 'AlignLeft':
        //Toggle the Left alignment for selected or current paragraph
        documenteditor.editor.toggleTextAlignment('Left');
        break;
    case 'AlignRight':
        //Toggle the Right alignment for selected or current paragraph
        documenteditor.editor.toggleTextAlignment('Right');
        break;
    case 'AlignCenter':
        //Toggle the Center alignment for selected or current paragraph
        documenteditor.editor.toggleTextAlignment('Center');
        break;
    case 'Justify':
        //Toggle the Justify alignment for selected or current paragraph
        documenteditor.editor.toggleTextAlignment('Justify');
        break;
    case 'IncreaseIndent':
        //Increase the left indent of selected or current paragraph
        documenteditor.editor.increaseIndent();
        break;
    case 'DecreaseIndent':
        //Decrease the left indent of selected or current paragraph
        documenteditor.editor.decreaseIndent();
        break;
    case 'ClearFormat':
        //Clear all formattiing of the selected paragraph or content.
        documenteditor.editor.clearFormatting();
        break;
    case 'ShowParagraphMark':
        //Show or hide the hidden characters like spaces, tab, paragraph marks, and breaks.
        documenteditor.documentEditorSettings.showHiddenMarks = !documenteditor.documentEditorSettings.showHiddenMarks;
        break;
}
}
//Change the line spacing of selected or current paragraph
function lineSpacingAction(args: any) {
let text: string = args.item.text;
switch (text) {
    case 'Single':
        documenteditor.selection.paragraphFormat.lineSpacing = 1;
        break;
    case '1.15':
        documenteditor.selection.paragraphFormat.lineSpacing = 1.15;
        break;
    case '1.5':
        documenteditor.selection.paragraphFormat.lineSpacing = 1.5;
        break;
    case 'Double':
        documenteditor.selection.paragraphFormat.lineSpacing = 2;
        break;
}
setTimeout((): void => {
    documenteditor.focusIn();
}, 30);
}
documenteditor.selectionChange = () => {
setTimeout(() => {
    onSelectionChange();
}, 20);
};
// Selection change to retrieve formatting
function onSelectionChange() {
if (documenteditor.selection) {
    var paragraphFormat = documenteditor.selection.paragraphFormat;
    var toggleBtnId = ['AlignLeft', 'AlignCenter', 'AlignRight', 'Justify', 'ShowParagraphMark'];
    for (var i = 0; i < toggleBtnId.length; i++) {
        let toggleBtn: HTMLElement = document.getElementById(toggleBtnId[i]);
        //Remove toggle state.
        toggleBtn.classList.remove('e-btn-toggle');
    }
    //Add toggle state based on selection paragraph format.
    if (paragraphFormat.textAlignment === 'Left') {
        document.getElementById('AlignLeft').classList.add('e-btn-toggle');
    } else if (paragraphFormat.textAlignment === 'Right') {
        document.getElementById('AlignRight').classList.add('e-btn-toggle');
    } else if (paragraphFormat.textAlignment === 'Center') {
        document.getElementById('AlignCenter').classList.add('e-btn-toggle');
    } else {
        document.getElementById('Justify').classList.add('e-btn-toggle');
    }
    if (documenteditor.documentEditorSettings.showHiddenMarks) {
        document.getElementById('ShowParagraphMark').classList.add('e-btn-toggle');
    }
    // #endregion
}
}
//Toolbar configuration to add paragraph formatting options
let toolBar: Toolbar = new Toolbar({
clicked: toolbarButtonClick,
items: [
    {
        prefixIcon: 'e-de-ctnr-alignleft e-icons',
        tooltipText: 'Align Left',
        id: 'AlignLeft',
    },
    {
        prefixIcon: 'e-de-ctnr-aligncenter e-icons',
        tooltipText: 'Align Center',
        id: 'AlignCenter',
    },
    {
        prefixIcon: 'e-de-ctnr-alignright e-icons',
        tooltipText: 'Align Right',
        id: 'AlignRight',
    },
    {
        prefixIcon: 'e-de-ctnr-justify e-icons',
        tooltipText: 'Justify',
        id: 'Justify',
    },
    {
        prefixIcon: 'e-de-ctnr-increaseindent e-icons',
        tooltipText: 'Increase Indent',
        id: 'IncreaseIndent',
    },
    {
        prefixIcon: 'e-de-ctnr-decreaseindent e-icons',
        tooltipText: 'Decrease Indent',
        id: 'DecreaseIndent',
    },
    {
        type: 'Separator'
    },
    {
        id: 'lineSpacing'
    },
    {
        prefixIcon: 'e-de-ctnr-clearall e-icons',
        tooltipText: 'ClearFormatting',
        id: 'ClearFormat',
    },
    {
        type: 'Separator'
    },
    {
        prefixIcon: 'e-de-e-paragraph-mark e-icons',
        tooltipText: 'Show the hidden characters like spaces, tab, paragraph marks, and breaks.(Ctrl + *)',
        id: 'ShowParagraphMark',
    }
],
});
toolBar.appendTo('#toolbar');
let items: ItemModel[] = [
{
    text: 'Single',
},
{
    text: '1.15',
},
{
    text: '1.5',
},
{
    text: 'Double',
},
];
let dropdown = new DropDownButton({
items: items,
iconCss: 'e-de-ctnr-linespacing e-icons',
select: lineSpacingAction,
});
dropdown.appendTo('#lineSpacing');

documenteditor.appendTo('#DocumentEditor');

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<head>
            
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</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='toolbar'>            
        </div>
        <div style="width:100%;height: 100%">
            <!--Element which will render as DocumentEditor -->
            <div id="DocumentEditor"></div>
        </div>
    </div>
</body>

</html>