Cascading List and ListItem using PnP Controls in the SharePoint Framework (SPFx) webpart

This article provide steps to implement the Cascading List and ListItem using PnP Controls in the SharePoint Framework (SPFx) webpart, we have used two PnP control. PnP list picker control allows you to select one or multiple available lists/libraries of the current site and PnP List picker control allows you to select one or more items from a list and this control will suggest items based on the inserted value

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/spfx-controls-react --save --save-exact

Configure the custom properties

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

export interface ISpfxPnpListListitemPickerState {
  SeletedList: string;
}

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<ISpfxPnpListListitemPickerProps> = React.createElement(
      SpfxPnpListListitemPicker,
      {
        description: this.properties.description,
        context:this.context
      }
    );
    ReactDom.render(element, this.domElement);
  }

Update the <web part name>.tsx file. 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 './SpfxPnpListListitemPicker.module.scss';
import { ISpfxPnpListListitemPickerProps } from './ISpfxPnpListListitemPickerProps';
import { ISpfxPnpListListitemPickerState } from './ISpfxPnpListListitemPickerState';
import { ListPicker, ListItemPicker } from "@pnp/spfx-controls-react/lib";
import { autobind } from 'office-ui-fabric-react/lib/Utilities';

Replace this render function with the following code.

  public render(): React.ReactElement<ISpfxPnpListListitemPickerState> {
    return (
      <div className={styles.spfxPnpListListitemPicker}>
        <ListPicker context={this.props.context}
          label="Select your list"
          placeHolder="Select your list"
          baseTemplate={100}
          includeHidden={false}
          multiSelect={false}
          onSelectionChanged={this.onListPickerChange} />
        <br></br>
        <label>Search List Item</label>
        <ListItemPicker listId={this.state.SeletedList}
          columnInternalName='Title'
          keyColumnInternalName='Id'
          itemLimit={1}
          onSelectedItem={this.onSelectedItem}
          context={this.props.context} />
      </div>
    );
  }

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

export default class SpfxPnpListListitemPicker extends React.Component<ISpfxPnpListListitemPickerProps, ISpfxPnpListListitemPickerState> {
  constructor(props: ISpfxPnpListListitemPickerProps, state: ISpfxPnpListListitemPickerState) {
    super(props);
    sp.setup({
      spfxContext: this.props.context
    });
    this.state = { SeletedList: '' };
  }

Add below event functions inside the react component

  @autobind
  private onListPickerChange(selectedlist: string) {
    this.setState({
      SeletedList: selectedlist
    });
  }

  private onSelectedItem(data: { key: string; name: string }[]) {
    for (const item of data) {
      console.log(`Item value: ${item.key}`);
      console.log(`Item text: ${item.name}`);
    }
  }

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.

Sharing is caring!

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

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