modern taxonomy picker: ability to disallow selecting children (#1279)

* Add `.github/fabricbot.json`

* feat(modern taxonomy picker): ability to disallow selecting children

Adds new `allowSelectingChildren` prop, which is true by default. Setting to `false` means only the top-level terms appear in search results, and their tree nodes are not expandable. Respects `anchorTermId`.

Co-authored-by: msftbot[bot] <48340428+msftbot[bot]@users.noreply.github.com>
Co-authored-by: Alex Terentiev <aleksei.terentiev@gmail.com>
Co-authored-by: Jake Stanger <jake.stanger@core.co.uk>

docs/documentation/docs/controls/ModernTaxonomyPicker.md

@@ -177,6 +177,7 @@ The ModernTaxonomyPicker control can be configured with the following properties
 | isBlocking | boolean | no | Whether the panel uses a modal overlay or not. |
 | onRenderActionButton | function | no | Optional custom renderer for adding e.g. a button with additional actions to the terms in the tree view. |
 | isPathRendered | boolean | no | Whether the terms will be rendered with the term label or the full path up to the root. |
+| allowSelectingChildren | boolean | no | Whether child terms can be selected. Default value is true. |
 
 ## Standalone TaxonomyTree control
 

src/controls/modernTaxonomyPicker/ModernTaxonomyPicker.tsx

@@ -61,6 +61,7 @@ export interface IModernTaxonomyPickerProps {
   isLightDismiss?: boolean;
   isBlocking?: boolean;
   onRenderActionButton?: (termStoreInfo: ITermStoreInfo, termSetInfo: ITermSetInfo, termInfo?: ITermInfo) => JSX.Element;
+  allowSelectingChildren?: boolean;
 }
 
 export function ModernTaxonomyPicker(props: IModernTaxonomyPickerProps): JSX.Element {
@@ -160,15 +161,20 @@ export function ModernTaxonomyPicker(props: IModernTaxonomyPickerProps): JSX.Ele
     if (filter === '') {
       return [];
     }
-    const filteredTerms = await taxonomyService.searchTerm(Guid.parse(props.termSetId), filter, currentLanguageTag, props.anchorTermId ? Guid.parse(props.anchorTermId) : Guid.empty);
+    const filteredTerms = await taxonomyService.searchTerm(Guid.parse(props.termSetId), filter, currentLanguageTag, props.anchorTermId ? Guid.parse(props.anchorTermId) : Guid.empty, props.allowSelectingChildren);
+
     const filteredTermsWithParentInformation = props.isPathRendered ? await addParentInformationToTerms(filteredTerms) : filteredTerms;
     const filteredTermsWithoutSelectedItems = filteredTermsWithParentInformation.filter((term) => {
       if (!selectedItems || selectedItems.length === 0) {
         return true;
       }
       return selectedItems.every((item) => item.id !== term.id);
     });
-    const filteredTermsAndAvailable = filteredTermsWithoutSelectedItems.filter((term) => term.isAvailableForTagging.filter((t) => t.setId === props.termSetId)[0].isAvailable);
+
+    const filteredTermsAndAvailable = filteredTermsWithoutSelectedItems
+      .filter((term) =>
+        term.isAvailableForTagging
+          .filter((t) => t.setId === props.termSetId)[0].isAvailable);
     return filteredTermsAndAvailable;
   }
 
@@ -329,6 +335,7 @@ export function ModernTaxonomyPicker(props: IModernTaxonomyPickerProps): JSX.Ele
                 themeVariant={props.themeVariant}
                 termPickerProps={props.termPickerProps}
                 onRenderActionButton={props.onRenderActionButton}
+                allowSelectingChildren={props.allowSelectingChildren}
               />
             </div>
           )

src/controls/modernTaxonomyPicker/taxonomyPanelContents/TaxonomyPanelContents.tsx

@@ -39,6 +39,7 @@ export interface ITaxonomyPanelContentsProps {
   themeVariant?: IReadonlyTheme;
   termPickerProps?: Optional<IModernTermPickerProps, 'onResolveSuggestions'>;
   onRenderActionButton?: (termStoreInfo: ITermStoreInfo, termSetInfo: ITermSetInfo, termInfo: ITermInfo, updateTaxonomyTreeViewCallback?: (newTermItems?: ITermInfo[], updatedTermItems?: ITermInfo[], deletedTermItems?: ITermInfo[]) => void) => JSX.Element;
+  allowSelectingChildren?: boolean;
 }
 
 export function TaxonomyPanelContents(props: ITaxonomyPanelContentsProps): React.ReactElement<ITaxonomyPanelContentsProps> {
@@ -114,6 +115,7 @@ export function TaxonomyPanelContents(props: ITaxonomyPanelContentsProps): React
         onRenderActionButton={props.onRenderActionButton}
         hideDeprecatedTerms={true}
         showIcons={false}
+        allowSelectingChildren={props.allowSelectingChildren}
       />
     </div>
   );

src/controls/modernTaxonomyPicker/taxonomyTree/TaxonomyTree.tsx

@@ -58,6 +58,7 @@ export interface ITaxonomyTreeProps {
   selection?: Selection<any>; // eslint-disable-line @typescript-eslint/no-explicit-any
   hideDeprecatedTerms?: boolean;
   showIcons?: boolean;
+  allowSelectingChildren?: boolean;
 }
 
 export function TaxonomyTree(props: ITaxonomyTreeProps): React.ReactElement<ITaxonomyTreeProps> {
@@ -228,7 +229,7 @@ export function TaxonomyTree(props: ITaxonomyTreeProps): React.ReactElement<ITax
               level: 1,
               isCollapsed: true,
               data: { skiptoken: '', term: term },
-              hasMoreData: term.childrenCount > 0,
+              hasMoreData: props.allowSelectingChildren !== false && term.childrenCount > 0,
             };
             if (g.hasMoreData) {
               g.children = [];

src/services/SPTaxonomyService.ts

@@ -58,11 +58,33 @@ export class SPTaxonomyService {
     }
   }
 
-  public async searchTerm(termSetId: Guid, label: string, languageTag: string, parentTermId?: Guid, stringMatchId: string = '0', pageSize: number = 50): Promise<ITermInfo[]> {
+  public async searchTerm(termSetId: Guid, label: string, languageTag: string, parentTermId?: Guid, allowSelectingChildren = true, stringMatchId: string = '0', pageSize: number = 50): Promise<ITermInfo[]> {
     try {
-      const searchTermUrl = sp.termStore.concat(`/searchTerm(label='${label}',setId='${termSetId}',languageTag='${languageTag}',stringMatchId='${stringMatchId}'${parentTermId && parentTermId !== Guid.empty ? `,parentTermId='${parentTermId}'` : ''})`).toUrl();
+      let query = [
+        `label='${label}'`,
+        `setId='${termSetId}'`,
+        `languageTag='${languageTag}'`,
+        `stringMatchId='${stringMatchId}'`
+      ];
+
+      if(parentTermId !== Guid.empty) {
+        query.push(`parentTermId='${parentTermId}'`);
+      }
+
+      const searchTermUrl = sp.termStore.concat(`/searchTerm(${query.join(',')})`).toUrl();
       const searchTermQuery = SharePointQueryableCollection(searchTermUrl).top(pageSize);
-      const filteredTerms = await searchTermQuery();
+      let filteredTerms: ITermInfo[] = await searchTermQuery();
+
+      if(allowSelectingChildren === false) {
+        const hasParentId = parentTermId !== Guid.empty;
+
+        const set = sp.termStore.sets.getById(termSetId.toString());
+        const collection = hasParentId ? set.terms.getById(parentTermId.toString()).children : set.children;
+
+        const childrenIds = await collection.select("id").get().then(children => children.map(c => c.id));
+        filteredTerms = filteredTerms.filter(term => childrenIds.includes(term.id));
+      }
+
       return filteredTerms;
     } catch (error) {
       return [];