fix dataset not being passed to office-ui-fabric-react in contextual menu items

apps/demo/src/app/app.component.html

@@ -41,26 +41,30 @@ <h2>Getting up and running...</h2>
     <fab-pivot-item headerText="Tab 3"> <div>Tab 3's content</div> </fab-pivot-item>
   </fab-pivot>
 
+  <fab-default-button text="button">
+    <contextual-menu-item key="item1" text="item1" data-track-type="button > item1"></contextual-menu-item>
+    <contextual-menu-item key="item2" text="item2" data-track-type="button > item2"></contextual-menu-item>
+  </fab-default-button>
+
   <fab-command-bar>
     <items>
       <fab-command-bar-item
         key="run"
         text="Run"
         [iconProps]="{ iconName: 'CaretRight' }"
         [disabled]="runDisabled"
+        data-track-type="run"
       ></fab-command-bar-item>
       <fab-command-bar-item
         key="new"
         text="New"
         [iconProps]="{ iconName: 'Add' }"
         (click)="onNewClicked()"
       ></fab-command-bar-item>
-      <fab-command-bar-item
-        key="copy1"
-        text="Copy1"
-        [iconProps]="{ iconName: 'Copy' }"
-        (click)="onCopyClicked()"
-      ></fab-command-bar-item>
+      <fab-command-bar-item key="copy" text="Copy" [iconProps]="{ iconName: 'Copy' }" (click)="onCopyClicked()">
+        <contextual-menu-item key="item1" text="Item1" data-track-type="copy1 > item1"></contextual-menu-item>
+        <contextual-menu-item key="item2" text="Item2" data-track-type="copy1 > item2"></contextual-menu-item>
+      </fab-command-bar-item>
       <fab-command-bar-item
         key="copy2"
         text="Copy2"

libs/fabric/src/lib/components/button/base-button.component.ts

@@ -24,6 +24,7 @@ import { Subscription } from 'rxjs';
 import { CommandBarItemChangedPayload } from '../command-bar/directives/command-bar-item.directives';
 import { mergeItemChanges } from '../core/declarative/item-changed';
 import { omit } from '../../utils/omit';
+import { getDataAttributes } from '../../utils/get-data-attributes';
 
 export abstract class FabBaseButtonComponent extends ReactWrapperComponent<IButtonProps>
   implements OnInit, AfterContentInit, OnDestroy {
@@ -167,6 +168,7 @@ export abstract class FabBaseButtonComponent extends ReactWrapperComponent<IButt
         'ngOnDestroy',
         'ngAfterContentInit'
       ),
+      ...getDataAttributes(directive.elementRef.nativeElement, true),
       onClick: (ev, item) => {
         directive.click.emit({ ev: ev && ev.nativeEvent, item: item });
       },

libs/fabric/src/lib/components/command-bar/directives/command-bar-item.directives.ts

@@ -1,7 +1,7 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
-import { ContentChild, Directive, Input, TemplateRef } from '@angular/core';
+import { ContentChild, Directive, Input, TemplateRef, ElementRef } from '@angular/core';
 import { ContextualMenuItemDirective } from '../../contextual-menu/directives/contextual-menu-item.directive';
 import { ItemChangedPayload } from '../../core/declarative/item-changed.payload';
 import {
@@ -37,4 +37,8 @@ export class CommandBarItemDirective extends ContextualMenuItemDirective impleme
   @Input() cacheKey?: ICommandBarItemOptions['cacheKey'];
   @Input() renderedInOverflow?: ICommandBarItemOptions['renderedInOverflow'];
   @Input() commandBarButtonAs?: ICommandBarItemOptions['commandBarButtonAs'];
+
+  constructor(elementRef: ElementRef<HTMLElement>) {
+    super(elementRef);
+  }
 }

libs/fabric/src/lib/components/command-bar/directives/command-bar-items.directives.ts

@@ -6,15 +6,17 @@ import { ContentChildren, Directive, QueryList } from '@angular/core';
 import { ChangeableItemsDirective } from '../../core/shared/changeable-items.directive';
 import { ICommandBarItemOptions } from '../command-bar.component';
 import { CommandBarItemDirective } from './command-bar-item.directives';
+import { getDataAttributes } from '../../../utils/get-data-attributes';
 
 export abstract class CommandBarItemsDirectiveBase extends ChangeableItemsDirective<ICommandBarItemOptions> {
   abstract readonly directiveItems: QueryList<CommandBarItemDirective>;
 
   get items() {
     return (
       this.directiveItems &&
-      this.directiveItems.map<ICommandBarItemOptions>(directiveItem => ({
+      this.directiveItems.map<ICommandBarItemOptions>((directiveItem: CommandBarItemDirective) => ({
         ...directiveItem,
+        ...getDataAttributes(directiveItem.elementRef.nativeElement, true),
         onClick: (ev, item) => {
           directiveItem.click.emit({
             ev: ev && ev.nativeEvent,

libs/fabric/src/lib/components/contextual-menu/directives/contextual-menu-item.directive.ts

@@ -12,6 +12,7 @@ import {
   QueryList,
   ContentChild,
   TemplateRef,
+  ElementRef,
 } from '@angular/core';
 import { IContextualMenuItem } from 'office-ui-fabric-react';
 import { KnownKeys, InputRendererOptions } from '@angular-react/core';
@@ -20,6 +21,7 @@ import { OnChanges } from '../../../declarations/angular/typed-changes';
 import { ItemChangedPayload } from '../../core/declarative/item-changed.payload';
 import { ChangeableItemsHelper, IChangeableItemsContainer } from '../../core/shared/changeable-helper';
 import { ChangeableItemDirective } from '../../core/shared/changeable-item.directive';
+import { getDataAttributes } from '../../../utils/get-data-attributes';
 
 export type ContextualMenuItemChangedPayload = ItemChangedPayload<
   IContextualMenuItemOptions['key'],
@@ -101,6 +103,10 @@ export class ContextualMenuItemDirective extends ChangeableItemDirective<IContex
     return this._changeableItemsHelper && this._changeableItemsHelper.onItemsChanged;
   }
 
+  constructor(readonly elementRef: ElementRef<HTMLElement>) {
+    super();
+  }
+
   private _changeableItemsHelper: ChangeableItemsHelper<IContextualMenuItem>;
 
   ngAfterContentInit() {
@@ -129,6 +135,7 @@ export class ContextualMenuItemDirective extends ChangeableItemDirective<IContex
   private _directiveToContextualMenuItem(directive: ContextualMenuItemDirective): IContextualMenuItem {
     return {
       ...directive,
+      ...getDataAttributes(directive.elementRef.nativeElement, true),
       onClick: (ev, item) => {
         directive.click.emit({ ev: ev && ev.nativeEvent, item: item });
       },
@@ -143,6 +150,11 @@ export interface IContextualMenuItemOptions<TData = any>
   readonly renderIcon?: InputRendererOptions<IContextualMenuItemOptionsRenderIconContext>;
   readonly render?: InputRendererOptions<IContextualMenuItemOptionsRenderContext>;
   readonly data?: TData;
+
+  /**
+   * For any attributes like data-* etc.
+   */
+  [propertyName: string]: any;
 }
 
 export interface IContextualMenuItemOptionsRenderContext {

libs/fabric/src/lib/utils/get-data-attributes.ts

@@ -0,0 +1,32 @@
+import { kebabCase } from './kebab-case';
+
+/**
+ * Gets the data attributes on an `HTMLElement`.
+ *
+ * @example
+```keepDataPrefix === false```:
+```html
+<div data-service="Foo" data-service-type="bar"></div> -> { 'service': 'Foo', 'service-type': 'Bar' }
+```
+
+```keepDataPrefix === true```:
+```html
+<div data-service="Foo" data-service-type="bar"></div> -> { 'data-service': 'Foo', 'data-service-type': 'Bar' }
+```
+ */
+export function getDataAttributes<T extends HTMLElement>(
+  element: T,
+  keepDataPrefix: boolean = false
+): Record<string, string> {
+  return Object.entries(element.dataset).reduce(
+    (acc, [key, value]) => ({
+      ...acc,
+      [calculateKey(key, keepDataPrefix)]: value,
+    }),
+    {}
+  );
+}
+
+function calculateKey(key: string, keepDataPrefix: boolean): string {
+  return `${keepDataPrefix && 'data-'}${kebabCase(key)}`;
+}

libs/fabric/src/lib/utils/kebab-case.ts

@@ -0,0 +1,7 @@
+/** Implementation borrowed from https://github.com/joakimbeng/kebab-case */
+
+const KEBAB_REGEX = /[A-Z\u00C0-\u00D6\u00D8-\u00DE]/g;
+
+export function kebabCase(str: string) {
+  return str.replace(KEBAB_REGEX, match => '-' + match.toLowerCase());
+}