DropDownList component value change through setState

Need to change the value through setState in change event in which value and dataSource properties are maintain in state.

Solution

You can change the value through setState method and need to check the condition like e.isInteracted. Please refer the below code.

  private contacts: { [key: string]: Object }[] = [
    { displayName: 'bob', id: 'abc' },
    { displayName: 'tom', id: 'efg' }
  ];
  private fields: { [key: string]: Object } = { text: 'displayName', value: 'id' };
  constructor(props: Object) {
    super(props);
    this.onChange = this.onChange.bind(this);
    this.state = { contactId: 'abc', contacts: this.contacts };
  }
  onChange(e: ChangeEventArgs) {
    if (e.isInteracted) {
      this.setState({ contactId: e.value });
    }
  }
  render() {
    return (
      <DropDownListComponent dataSource={this.state.contacts} id="ddlelement" change={this.onChange} value={this.state.contactId} fields={this.fields} />
    );
  }

Installing and Running Application

Installing

To install all dependent packages, use the below command

npm install

Run the application

To compile and run the source files, use the below command

npm start