This article provides steps to implement the PnP Taxonomy Picker in the SharePoint Framework (SPFx) web part, This Taxonomy Picker control allows you to select one or more Terms from a TermSet via its name or TermSet ID. You can also configure the control to select the child terms from a specific term in the TermSet by setting the AnchorId. In this article we using PnP Taxonomy Picker to set and get the value for SharePoint Managed Matadata field.

Create a new web part project

Open power shell and run following comment to create a new web part by running the Yeoman SharePoint Generator

yo @microsoft/sharepoint

When prompted:

Enter the webpart name as your solution name, and then select Enter.
Select Create a subfolder with solution name for where to place the files.
Select Y to allow the solution to be deployed to all sites immediately.
Select N on the question if solution contains unique permissions.
Select WebPart as the client-side component type to be created.

The next set of prompts ask for specific information about your web part:

Enter your web part name, and then select Enter.
Enter your web part description, and then select Enter.
Select React framework as the framework you would like to use, and then select Enter.

Start Visual Studio Code (or your favorite code editor) within the context of the newly created project folder.

cd .\web part name\
code .

Install the library and required dependencies

npm install @pnp/sp --save
npm install @pnp/spfx-controls-react --save --save-exact

Import the library into your application, update constructor, and access the root sp object in render for PnPjs libraries.

sp.setup({spfxContext: this.props.spcontect});

Configure the custom properties

Create a new source code file under the src\webparts\<Webpart name>\components\ folder of the solution. Create the new file I<web part name>State.ts and use it to create a TypeScript Interface

import {  IPickerTerms } from "@pnp/spfx-controls-react/lib/TaxonomyPicker";
export interface ISpfxPnpTaxonomypickerState {
  tags: IPickerTerms;
}

In addition, you need to update the render method of the client-side web part to create a properly configured instance of the React component for rendering. The following code shows the updated method definition.

  public render(): void {
    const element: React.ReactElement<ISpfxPnpTaxonomypickerProps> = React.createElement(
      SpfxPnpTaxonomypicker,
      {
        description: this.properties.description,
        context:this.context
      }
    );
    ReactDom.render(element, this.domElement);
  }

Update the tsx file under the components. First, add some import statements to import the types you defined earlier. Notice the import for I<web part name>Props and I<web part name>State. There are also some imports for the PnP components used to render the UI of the PnP React component and pnp sp imports.

import * as React from 'react';
import styles from './SpfxPnpTaxonomypicker.module.scss';
import { ISpfxPnpTaxonomypickerProps } from './ISpfxPnpTaxonomypickerProps';
import { ISpfxPnpTaxonomypickerState } from './ISpfxPnpTaxonomypickerState';
import { TaxonomyPicker, IPickerTerms } from "@pnp/spfx-controls-react/lib/TaxonomyPicker";
import { sp } from "@pnp/sp";
import "@pnp/sp/webs";
import "@pnp/sp/lists";
import "@pnp/sp/items";
import "@pnp/sp/fields";

Replace this render function with the following code.

  public render(): React.ReactElement<ISpfxPnpTaxonomypickerProps> {
    return (
      <div className={styles.spfxPnpTaxonomypicker}>
        <TaxonomyPicker allowMultipleSelections={true}
          initialValues={this.state.tags}
          termsetNameOrID="Department"
          panelTitle="Select Departments"
          label="Departments Picker"
          context={this.props.context}
          onChange={this.onMultySelectTaxPickerChange}
          isTermSetSelectable={false} />
      </div>
    );
  }

Update the React component type declaration and add a constructor, as shown in the following example.

export default class SpfxPnpTaxonomypicker extends React.Component<ISpfxPnpTaxonomypickerProps, ISpfxPnpTaxonomypickerState> {
  constructor(props: ISpfxPnpTaxonomypickerProps) {
    super(props);
    sp.setup({
      spfxContext: this.props.context
    });
    this.state = ({ tags: [] });
    this._gettags();
  }

place the below code inside the react component code, these functions using PnPjs to get and set values in to the Managed Metadata Field

  private async _gettags() {
    const item: any = await sp.web.lists.getByTitle("GroupTags").items.getById(1).get();
    let selectedtags: any = [];
    item.Tags.forEach(function (v: any[], i) {
      selectedtags.push({ key: v["TermGuid"], name: v["Label"] })
    });
    console.log(item);
    this.setState({
      tags: selectedtags
    });
  }

  //Use this function if your control's select type is Multy
  private async onMultySelectTaxPickerChange(terms: IPickerTerms) {
    let list = sp.web.lists.getByTitle("GroupTags");
    const field = await list.fields.getByTitle(`Tags_0`).get();
    let termsString: string = '';
    terms.forEach(function (v, i) {
      termsString += `-1;#${v.name}|${v.key};#`;
    })
    const data = {};
    data[field.InternalName] = termsString;
    const i = await list.items.getById(1).update(data);
  }

  //Use this function if your control's select type is Single
  private async onSingleSelectTaxPickerChange(terms: IPickerTerms) {
    const data = {};
    data['Tags'] = {
      "__metadata": { "type": "SP.Taxonomy.TaxonomyFieldValue" },
      "Label": terms[0].name,
      'TermGuid': terms[0].key,
      'WssId': '-1'
    };
    return await sp.web.lists.getByTitle("GroupTags").items.getById(1).update(data);
  }

Deploy the solution

You’re now ready to build, bundle, package, and deploy the solution.

Run the gulp commands to verify that the solution builds correctly.

gulp build

Use the following command to bundle and package the solution.

gulp bundle --ship
gulp package-solution --ship

Browse to the app catalog of your target tenant and upload the solution package. You can find the solution package under the sharepoint/solution folder of your solution. It is the .sppkg file. After you upload the solution package in the app catalog. you can find and the web part anywhere across the tenant.

PnP Taxonomy Picker in the SharePoint Framework (SPFx) web part

🔗github.com

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If you have any questions, feel free to let me know in the comments section.
Happy coding!!!