反应:将道具传递给功能组件 [英] React: Passing down props to functional components
问题描述
关于道具和功能组件,我似乎有一个琐碎的问题。基本上,我有一个容器组件,该组件在用户单击按钮时触发的状态更改后呈现一个Modal组件。模态是一个无状态的功能组件,其中包含一些输入字段,这些输入字段需要连接到容器组件内部的功能。
I have a seemingly trivial question about props and functional components. Basically, I have a container component which renders a Modal component upon state change which is triggered by user click on a button. The modal is a stateless functional component that houses some input fields which need to connect to functions living inside the container component.
我的问题:当用户与无状态Modal组件内的表单字段进行交互时,如何使用父组件内的函数来更改状态?我是否错误地传递了道具?预先感谢。
My question: How can I use the functions living inside the parent component to change state while the user is interacting with form fields inside the stateless Modal component? Am I passing down props incorrectly? Thanks in advance.
容器
export default class LookupForm extends Component {
constructor(props) {
super(props);
this.state = {
showModal: false
};
}
render() {
let close = () => this.setState({ showModal: false });
return (
... // other JSX syntax
<CreateProfile fields={this.props} show={this.state.showModal} onHide={close} />
);
}
firstNameChange(e) {
Actions.firstNameChange(e.target.value);
}
};
功能(模态)组件
const CreateProfile = ({ fields }) => {
console.log(fields);
return (
... // other JSX syntax
<Modal.Body>
<Panel>
<div className="entry-form">
<FormGroup>
<ControlLabel>First Name</ControlLabel>
<FormControl type="text"
onChange={fields.firstNameChange} placeholder="Jane"
/>
</FormGroup>
);
};
示例:说我想呼叫 this.firstNameChange
在Modal组件中。我猜想将道具传递给功能组件的破坏性语法让我有些困惑。即:
Example: say I want to call this.firstNameChange
from within the Modal component. I guess the "destructuring" syntax of passing props to a functional component has got me a bit confused. i.e:
const SomeComponent =({someProps})=> {// ...};
推荐答案
您需要分别传递每个道具您需要调用的每个函数
You would need to pass down each prop individually for each function that you needed to call
<CreateProfile
onFirstNameChange={this.firstNameChange}
onHide={close}
show={this.state.showModal}
/>
然后在CreateProfile组件中可以执行
and then in the CreateProfile component you can either do
const CreateProfile = ({onFirstNameChange, onHide, show }) => {...}
进行解构后,会将匹配的属性名称/值分配给传入的变量。名称只需与属性相匹配
with destructuring it will assign the matching property names/values to the passed in variables. The names just have to match with the properties
,或者只需
const CreateProfile = (props) => {...}
,然后在每个地方调用 props.onHide
或您尝试访问的任何道具。
and in each place call props.onHide
or whatever prop you are trying to access.
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