This article provide steps to implement the Multi-Select Lookup Field Managed Using Fluent UI Dropdown in the SharePoint Framework (SPFx) web part, generally Fluent UI Dropdown is a list in which the selected item is always visible, and the others are visible on demand by clicking a drop-down button. They are used to simplify the design and make a choice within the UI. When closed, only the selected item is visible. When users click the drop-down button, all the options become visible. To change the value, users open the list and click another value or use the arrow keys (up and down) to select a new value. Here we save and retrive values multi-select lookup field values in the SharePoint List.
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/sharepointWhen 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 --saveConfigure 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
import { Dropdown, DropdownMenuItemType, IDropdownOption, IDropdownStyles } from 'office-ui-fabric-react/lib/Dropdown';
export interface ISpfxFluentuiDropdownState {
projectlookupvalues: IDropdownOption[];
salestitle: string;
seletedprojects: number[];
}
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 './SpfxFluentuiDropdown.module.scss';
import { ISpfxFluentuiDropdownProps } from './ISpfxFluentuiDropdownProps';
import { ISpfxFluentuiDropdownState } from './ISpfxFluentuiDropdownState';
import { Dropdown, IDropdownOption, TextField, PrimaryButton } from 'office-ui-fabric-react';
import { autobind } from 'office-ui-fabric-react/lib/Utilities';
import { sp } from "@pnp/sp";
import "@pnp/sp/webs";
import "@pnp/sp/lists";
import "@pnp/sp/items";
Replace this render function with the following code.
public render(): React.ReactElement<ISpfxFluentuiDropdownProps> {
return (
<div className={styles.spfxFluentuiDropdown}>
<TextField
className={styles.fixedwidth}
label="Title" value={this.state.salestitle} onChanged={(titlevalue) => this.setState({ salestitle: titlevalue })} />
{this.state.seletedprojects == null ? '' : <Dropdown
placeholder="Select projects"
label="Projects"
onChange={this.projects_selection}
multiSelect
options={this.state.projectlookupvalues}
className={styles.fixedwidth}
defaultSelectedKeys={this.state.seletedprojects}
/>}
<br />
<PrimaryButton text="Save" onClick={this._savesales} />
</div>
);
}
Update the React component type declaration and add a constructor, as shown in the following example.
export default class SpfxFluentuiDropdown extends React.Component<ISpfxFluentuiDropdownProps, ISpfxFluentuiDropdownState> {
constructor(props: ISpfxFluentuiDropdownProps, state: ISpfxFluentuiDropdownState) {
super(props);
sp.setup({
spfxContext: this.props.context
});
this.state = ({ projectlookupvalues: [], salestitle: '', seletedprojects: null })
this._getLookupvalues();
}
Add below event functions and function to get list items from SharePoint to inside the react component
@autobind
private async _getLookupvalues() {
const allItems: any[] = await sp.web.lists.getByTitle("Projects").items.getAll();
let projectarr: IDropdownOption[] = [];
allItems.forEach(project => {
projectarr.push({ key: project.ID, text: project.Title });
})
this.setState({
projectlookupvalues: projectarr
});
this._getSalesInfo();
}
@autobind
private async _getSalesInfo() {
const salesitem: any = await sp.web.lists.getByTitle("Sales").items.getById(1).get();
console.log(salesitem)
this.setState({ seletedprojects: salesitem.ProjectsId, salestitle: salesitem.Title })
}
@autobind
private async _savesales() {
await sp.web.lists.getByTitle("Sales").items.getById(1).update({
Title: this.state.salestitle,
ProjectsId: {
results: this.state.seletedprojects
}
});
}
@autobind
private projects_selection(event: React.FormEvent<HTMLDivElement>, item: IDropdownOption) {
if (item.selected) {
let seleteditemarr = this.state.seletedprojects;
seleteditemarr.push(+item.key);
this.setState({ seletedprojects: seleteditemarr });
}
else {
let seleteditemarr = this.state.seletedprojects;
let i = seleteditemarr.indexOf(+item.key);
if (i >= 0) {
seleteditemarr.splice(i, 1);
}
this.setState({ seletedprojects: seleteditemarr });
}
}
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 buildUse the following command to bundle and package the solution.
gulp bundle --ship
gulp package-solution --shipBrowse 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.
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If you have any questions, feel free to let me know in the comments section.
Happy coding!!!
Ravichandran Blog 
Hi ravichandran, What type of field is Projects, that you created in sharepoint, can ypu please paste a screenshot of that field
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Hi Varun,
It is Lookup field type with the multi-select option, check below screenshot
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defaultSelectedKeys is not setting values
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Please make sure drop down list’s options populated, before you assigning defaultSelectedKeys
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