How do you set the value of a TextField from Dropdown Selection? - reactjs

Question

In the following code, I was curious as to how you would set the value of the following TextField.
For this example, how do I set the TextField to the selected item in the Dropdown?
If the user selects "TOP LEVEL" in the Dropdown, then I want to populate the TextField to be "TOP LEVEL". The Dropdown is called ChildComponent
import * as React from "react";
import ChildComponent from './Operations/ChildComponent';
import { DropdownMenuItemType, IDropdownOption } from 'office-ui-fabric-react/lib/Dropdown';
import { TextField} from 'office-ui-fabric-react/lib/TextField';
export interface ParentComponentState {
selectedItem?: { key: string | number | undefined };
value: {key: string};
}
export default class ParentComponent extends React.Component<{}, ParentComponentState> {
constructor(props, context) {
super(props, context);
}
public state: ParentComponentState = {
selectedItem: undefined,
value: undefined,
};
render(){
const { selectedItem } = this.state;
const options: IDropdownOption[] = [
{ key: 'blank', text: '' },
{ key: 'topLevelMake', text: 'Parents', itemType: DropdownMenuItemType.Header },
{ key: 'topLevel', text: 'TOP LEVEL' },
{ key: 'make', text: 'MAKE ITEM' },
{ key: 'divider_1', text: '-', itemType: DropdownMenuItemType.Divider },
{ key: 'Purchased', text: 'Purchases', itemType: DropdownMenuItemType.Header },
{ key: 'rawMaterial', text: 'RAW MATERIAL' },
{ key: 'buyItem', text: 'BUY ITEM' },
];
return(
<div>
<ChildComponent
options={options}
selectedKey={selectedItem ? selectedItem.key : undefined}
onChange={this._onChange}
/>
<TextField
name="textTest"
label={"Test"}
/>
</div>
);
}
private _onChange = (event: React.FormEvent<HTMLDivElement>, item: IDropdownOption): void => {
this.setState({ selectedItem: item });
let opValue = item.text;
console.log(event);
console.log(opValue);
};
}
After inserting Muhammad's logic, here is the error I am getting. Do I need to add an onChange event for the TextField? and then put "this.state.selectedItem" in the handleChange event? Do I need to make a new child component and have the TextField rollup to ParentComponent?

Answer 1

You just need to assign that state in the value prop for the textField as you have the selectedItem in your state
<TextFieid
label={"Test"}
styles={{ root: { width: 300 } }}
value={this.state.selectedItem}
/>

Answer 2

import * as React from "react";
import ChildComponent from './Operations/ChildComponent';
import { DropdownMenuItemType, IDropdownOption } from 'office-ui-fabric-react/lib/Dropdown';
import { TextField} from 'office-ui-fabric-react/lib/TextField';
export interface ParentComponentState {
selectedItem?: { key: string | number | undefined };
value?;
}
export default class ParentComponent extends React.Component{
constructor(props) {
super(props);
this.state = {
value: '',
};
}
public state: ParentComponentState = {
selectedItem: undefined,
};
handleChange = (event) => {
this.setState({
value: event.target.value,
})
};
render(){
const { selectedItem } = this.state;
const options: IDropdownOption[] = [
{ key: 'blank', text: '' },
{ key: 'topLevelMake', text: 'Parents', itemType: DropdownMenuItemType.Header },
{ key: 'topLevel', text: 'TOP LEVEL' },
{ key: 'make', text: 'MAKE ITEM' },
{ key: 'divider_1', text: '-', itemType: DropdownMenuItemType.Divider },
{ key: 'Purchased', text: 'Purchases', itemType: DropdownMenuItemType.Header },
{ key: 'rawMaterial', text: 'RAW MATERIAL' },
{ key: 'buyItem', text: 'BUY ITEM' },
];
return(
<div>
<ChildComponent
options={options}
selectedKey={selectedItem ? selectedItem.key : undefined}
onChange={this._onChange}
/>
<TextField
name="textTest"
label={"Test"}
onChange={this.handleChange}
value={this.state.value}
/>
</div>
);
}
private _onChange = (event: React.FormEvent<HTMLDivElement>, item: IDropdownOption): void => {
this.setState({ selectedItem: item });
this.setState({value: item.text})
let opValue = item.text;
console.log(event);
console.log(opValue);
};
}