Reactjs 如何使用道具更新我的表单
我有一个更新对话框组件,它需要更新一些值。我的更新对话框如下所示Reactjs 如何使用道具更新我的表单,reactjs,redux,react-redux,Reactjs,Redux,React Redux,我有一个更新对话框组件,它需要更新一些值。我的更新对话框如下所示 class EditWebsiteComponent extends React.Component { constructor(props) { super(props); this.state = { }; } handleChange = name => event => { let temp = this.props.se
class EditWebsiteComponent extends React.Component {
constructor(props) {
super(props);
this.state = {
};
}
handleChange = name => event => {
let temp = this.props.selectedWebsite;
temp[name] = event.target.value;
console.log(temp);
this.props.changesSelectedWebsite(temp);
// this.setState({
// [name]: event.target.value,
// });
};
onFileChange = event => {
this.setState({ logo: event.target.files[0] });
};
render() {
const openDialog = this.props.openDialog;
const {selectedWebsite} = this.props;
return (
<div>
{/*{this.props.selectedWebsite && this.props.selectedWebsite.title}*/}
<Dialog
fullWidth={true}
open={openDialog}
onClose={this.props.closeDialog}
>
<DialogTitle>
{"Edit Website"}
</DialogTitle>
<DialogContent>
<FormControl className="w-100">
<TextField
style={{'margin-right': "10px"}}
className="col-md-11 col-11"
id="name"
label="Title"
value={selectedWebsite.title}
onChange={this.handleChange('title')}
margin="normal"
fullWidth
/>
<TextField
style={{'margin-right': "10px"}}
className="col-md-11 col-11"
id="name"
label="URL"
value={selectedWebsite.url}
onChange={this.handleChange('url')}
margin="normal"
fullWidth
/>
<div style={{"margin-top": "20px"}} className='col-md-11 col-11 flex-class-custom'>
<input type="file" onChange={this.onFileChange} />
</div>
</FormControl>
</DialogContent>
<DialogActions>
<Button onClick={this.props.closeDialog} color="secondary">
Close
</Button>
<Button onClick={() =>
this.props.editWebsite({title: selectedWebsite.title, url:selectedWebsite.url, logo:selectedWebsite.logo, id:selectedWebsite.id})
} color="primary">
Edit
</Button>
</DialogActions>
</Dialog>
{this.props.showMessage && NotificationManager.error(this.props.alertMessage)}
<NotificationContainer/>
</div>
)
}
}
const mapDispatchToProps = dispatch => ({
editWebsite: (payload) => dispatch(editWebsite(payload)),
changesSelectedWebsite: (payload) => dispatch(changesSelectedWebsite(payload))
});
const mapStateToProps = state => ({
selectedWebsite : state.Websites.selectedWebsite,
});
export default connect(
mapStateToProps,
mapDispatchToProps
)(EditWebsiteComponent)
class EditWebsiteComponent扩展了React.Component{
建造师(道具){
超级(道具);
此.state={
};
}
handleChange=name=>event=>{
让temp=this.props.selectedWebsite;
temp[name]=event.target.value;
控制台日志(temp);
此.props.changesSelectedWebsite(temp);
//这是我的国家({
//[名称]:event.target.value,
// });
};
onFileChange=事件=>{
this.setState({logo:event.target.files[0]});
};
render(){
const openDialog=this.props.openDialog;
const{selectedWebsite}=this.props;
返回(
{/*{this.props.selectedWebsite&&this.props.selectedWebsite.title}*/}
{“编辑网站”}
接近
this.props.editWebsite({title:selectedWebsite.title,url:selectedWebsite.url,logo:selectedWebsite.logo,id:selectedWebsite.id})
}color=“primary”>
编辑
{this.props.showMessage&&NotificationManager.error(this.props.alertMessage)}
)
}
}
const mapDispatchToProps=调度=>({
editWebsite:(有效载荷)=>调度(editWebsite(有效载荷)),
changesSelectedWebsite:(有效负载)=>调度(changesSelectedWebsite(有效负载))
});
常量mapStateToProps=状态=>({
selectedWebsite:state.Websites.selectedWebsite,
});
导出默认连接(
MapStateTops,
mapDispatchToProps
)(编辑网站组件)
我从所选网站获取当前值,在更改时,我通过发送changesSelectedWebsite操作更新道具,但是对话框表单没有更新,尽管道具正在更新。我对react和redux非常陌生,所以我想问一下这种方法是否正确?因为我需要所选网站的值,而且如果用户更改了任何内容,我还需要更新。你能试着更改这行吗
this.props.changesSelectedWebsite(temp);
到
只要您在没有“重新创建”的情况下获得prop值,状态就不会感觉到更改,因此,{…temp}重新创建对象,为什么?因为它告诉状态这是一个新对象,并触发重新渲染器并保存新状态。谢谢,它现在可以工作了。您能告诉我,我是否可以以任何方式将props.selectedWebsite保存为组件状态吗?因为我需要更改状态以防use不更新并关闭对话框?为此,我建议您在React文档中查找useEffect Cleanup,它在组件卸载时运行,在您的情况下,当对话框关闭时运行。
this.props.changesSelectedWebsite({...temp});