在下面的代码中,我试图获取标记为“描述”的TextField,以强制文本全部使用大写字母。我添加了handleChange代码,但是每次尝试在该字段中键入内容时,它将冻结我的表单。我怎样才能使这个TextField都是大写字母?除了onChange之外,还有其他方法吗?是否可以在不使用onChange的情况下使此TextField全部为大写字母?
import * as React from "react";
import { Stack } from 'office-ui-fabric-react';
import { TextField} from 'office-ui-fabric-react/lib/TextField';
import { Dropdown, IDropdownOption } from 'office-ui-fabric-react/lib/Dropdown';
export interface DimInspectionProps {
}
export default class DimInspection extends React.Component<DimInspectionProps> {
handleChange(event) {
this.setState({value: event.target.value.toUpperCase()}); //trying to make them Upper Case
}
render() {
const levelOptions: IDropdownOption[] = [
{ key: '1', text: '1' },
{ key: '2', text: '2' },
{ key: '3', text: '3' },
{ key: '4', text: '4' },
{ key: '5', text: '5' },
{ key: '6', text: '6' }
]
return (
<div>
<Stack horizontal tokens={{ childrenGap: 5 }} styles={{ root: { width: 350 } }}>
<Dropdown
label="Level"
key="levelKey"
options={levelOptions}
styles={{ root: { width: 50 } }}
/>
<TextField
label="Description"
styles={{ root: { width: 245 } }}
onChange={this.handleChange} //here is where I am trying to handle the Change
/>
</Stack>
<Stack horizontal tokens={{ childrenGap: 5 }} styles={{ root: { width: 350 } }}>
<TextField
label="Setup Time"
styles={{ root: { width: 95 } }}
defaultValue={'1'}
suffix="hour(s)"
disabled={false}
/>
<TextField
label="Run Time"
suffix="min(s)"
styles={{ root: { width: 100 } }}
/>
<TextField
label="Contingency"
suffix="%"
styles={{ root: { width: 95 } }}
/>
</Stack>
<Stack horizontal tokens={{ childrenGap: 5 }} styles={{ root: { width: 350 } }}>
<TextField
label="Total Tooling"
styles={{ root: { width: 100 } }}
/>
<TextField
label="Comments"
styles={{ root: { width: 195 } }}
/>
</Stack>
</div>
);
}
}
根本上,问题可能是this.state
未定义。您需要在构造函数中对其进行初始化,或者在定义渲染函数之前添加它:
export class TextFieldControlledExample extends React.Component<{}, ITextFieldControlledExampleState> {
public state: ITextFieldControlledExampleState = { value: '' };
...
}
有关该库中受控组件的更多详细信息,请参见:https://developer.microsoft.com/en-us/fabric#/controls/web/textfield
此外,您当前没有受控组件(这意味着您无法控制该值)。您正在设置状态,但没有将其用作值。您的<TextField>
应该包含value
属性:
<TextField
label="Description"
styles={{ root: { width: 245 } }}
value={this.state.value}
onChange={this.handleChange}
/>