如何从下拉选择中设置TextField的值？
如何从下拉选择中设置TextField的值？
提问于 2020-04-01 08:52:18
在下面的代码中，我很好奇如何设置以下TextField的值。对于本例，如何将TextField设置为下拉列表中选定的项？如果用户在下拉列表中选择“顶级”，那么我希望将TextField填充为“顶级”。下拉列表称为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);
};
}在插入穆罕默德的逻辑之后，这是我所犯的错误。我需要为onChange添加一个TextField事件吗？然后把"this.state.selectedItem“放在handleChange事件中？我是否需要创建一个新的子组件并将TextField汇总到ParentComponent？
回答 2
Stack Overflow用户
回答已采纳
发布于 2020-04-01 08:57:05
您只需要在textField的值支柱中分配该状态，因为selectedItem在您的state中。
<TextFieid
label={"Test"}
styles={{ root: { width: 300 } }}
value={this.state.selectedItem}
/>Stack Overflow用户
发布于 2020-04-01 11:26:13
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);
};
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/60976176
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