我正在尝试为我单击的项目触发onClick事件。并非所有项目。
<Button onClick = {this.writeComment} varient="outlined" component="span" color="primary">
{!this.state.isComment ? "Write Comment": "Close"}
</Button>
{this.state.isComment ? <Comment onSubmit={this.commentSubmit} commentBody={this.state.comment_body} commentChange={this.handleCommentChange}/> : null}
writeComment函数
writeComment = (e) => {
e.preventDefault();
this.setState({
isComment:!this.state.isComment
})
}
这仅应为该项目而不是所有项目提供评论表单。这是在map循环内。
{this.state.images.length > 0 ? (
this.state.images.map( (img, i) => (
<Grid item sm={12} md={12} key={i} style={{ margin: '30px 0px'}}>
<Paper style={{padding:'20px 20px'}}>
{/* // empty image_title */}
<Typography style={{ padding: '30px 5px', letterSpacing:'8px', textTransform:'uppercase'}} variant="h4" align="center">{img.image_title}</Typography>
<Divider style={{ width: '150px', margin:'10px auto', backgroundColor:'#000000'}} variant="middle" />
<Image image_url={img.img_url} />
<Typography variant="h6" align="center">{img.user.username}</Typography>
<Typography variant="h6" align="center">{moment(img.created_at).calendar()}</Typography>
<Button onClick = {this.writeComment} varient="outlined" component="span" color="primary">
{!this.state.isComment ? "Write Comment": "Close"}
</Button>
{this.state.isComment ? <Comment onSubmit={this.commentSubmit} commentBody={this.state.comment_body} commentChange={this.handleCommentChange}/> : null}
<Button onClick={() => this.deleteImg(img.id)} variant="outlined" component="span" color="primary">
Delete
</Button>
</Paper>
</Grid>
))
) : (
<div>
<Grid item md={8}>
<Typography>No Images yet</Typography>
</Grid>
</div>
)}
</Grid>
{/* Images */}
</Grid>
完整代码
import React, { Component } from "react";
import Button from '@material-ui/core/Button';
import TextField from '@material-ui/core/TextField';
import Grid from '@material-ui/core/Grid';
import Typography from '@material-ui/core/Typography';
import Paper from '@material-ui/core/Paper';
import ImageUploader from 'react-images-upload';
import Divider from '@material-ui/core/Divider';
import Axios from '../Axios';
import Image from './Image';
import moment from 'moment';
import Comment from './Comment';
class Dashboard extends Component{
constructor(props){
super(props);
this.state = {
image_url: 'http://www.conservewildlifenj.org/images/artmax_1001.jpg',
images: [],
description:'',
upload:false,
isComment:false,
comment_body:''
}
}
handleUpload = file => {
const data = new FormData()
const image = file[0]
// console.log(this.state.description)
// data.append('ourImage', this.state.description)
data.append('ourImage',image, this.state.description )
Axios.post('/images/upload', data).then((response) => {
const newImage = {...response.data}
console.log(newImage);
//update component-state
this.setState({
description:'', // resets title after upload
images: [
{
id: newImage[0].id,
user:{
username: newImage[0].user.username
},
image_title: newImage[0].image_title,
img_url: newImage[0].img_url,
created_at: new Date().toLocaleString().replace(',', ''),
updated_at: new Date().toLocaleString().replace(',', '')
},
...this.state.images
]
})
});
}
handleChange = (e) => {
// e.preventDefault();
this.setState({
[e.target.name]: e.target.value
})
// console.log(this.state.description)
}
handleCommentChange = (e) => {
this.setState({
comment_body: e.target.value
})
}
componentWillMount(){
Axios.get('/images/uploads').then( (response) => {
// let img;
// let imgTitle;
Object.keys(response.data).forEach( (key) => {
console.log(response.data[key]);
this.setState({
images:[ ...this.state.images, response.data[key]]
})
console.log(this.state.images);
});
})
}
componentDidUpdate(prevProps, prevState) {
if (this.state.images.length !== prevState.images.length) {
console.log(this.state.images);
}
// debugger;
}
onUploadClick = (e) => {
e.preventDefault();
this.setState({
upload: !this.state.upload
})
}
deleteImg = (id) => {
Axios.post(`/images/delete/${id}`).then( () => {
this.setState({
images: [ ...this.state.images.filter(img => img.id !== id)]
})
})
}
writeComment = (e) => {
e.preventDefault();
this.setState({
isComment:!this.state.isComment
})
}
commentSubmit = (e) => {
e.preventDefault();
console.log(this.state.comment_body);
// Axios.post('/images/newComment', this.state.comment_body).then( (response )=> {
// const newComment = { ...response.data};
// console.log(newComment);
// this.setState({
// comment_body: ''
// })
// })
}
render(){
const uploader = (
<ImageUploader
withIcon={true}
withPreview={true}
onChange={this.handleUpload}
singleImage={true}
buttonText='Upload an image'
imgExtension={['.jpg', '.gif', '.png', '.gif']}
maxFileSize={5242880}
/>
)
return(
<div>
<Grid container justify="center" spacing={16}>
<Grid item sm={8} md={6} style={{ margin: '40px 0px', padding: '0px 30px'}}>
<Typography align="center" variant="h6">
Welcome to the Dashboard
</Typography>
<Button onClick={this.onUploadClick} variant="outlined" component="span" color="primary">
{/* toggle between Upload or Close
Will be upload by default, else if upload is clicked, close will show.
*/}
{!this.state.upload ? "Upload": "Close"}
</Button>
<br></br>
<br></br>
{this.state.upload ? (
<div>
<TextField
id="outlined-name"
label="Image Title"
name="description"
type="text"
required={true}
fullWidth
style={{ borderRadius: '0px'}}
className=""
value={this.state.description}
onChange={this.handleChange}
margin="normal"
/>
<br></br>
<br></br>
{/* so here what we are saying, if this text field is FILLED show the uploader component
else hide it.
*/}
{this.state.description ? uploader : null}
</div>
):(
null
)}
{this.state.images.length > 0 ? (
this.state.images.map( (img, i) => (
<Grid item sm={12} md={12} key={i} style={{ margin: '30px 0px'}}>
<Paper style={{padding:'20px 20px'}}>
{/* // empty image_title */}
<Typography style={{ padding: '30px 5px', letterSpacing:'8px', textTransform:'uppercase'}} variant="h4" align="center">{img.image_title}</Typography>
<Divider style={{ width: '150px', margin:'10px auto', backgroundColor:'#000000'}} variant="middle" />
<Image image_url={img.img_url} />
<Typography variant="h6" align="center">{img.user.username}</Typography>
<Typography variant="h6" align="center">{moment(img.created_at).calendar()}</Typography>
<Button onClick = {this.writeComment} varient="outlined" component="span" color="primary">
{!this.state.isComment ? "Write Comment": "Close"}
</Button>
{this.state.isComment ? <Comment onSubmit={this.commentSubmit} commentBody={this.state.comment_body} commentChange={this.handleCommentChange}/> : null}
<Button onClick={() => this.deleteImg(img.id)} variant="outlined" component="span" color="primary">
Delete
</Button>
</Paper>
</Grid>
))
) : (
<div>
<Grid item md={8}>
<Typography>No Images yet</Typography>
</Grid>
</div>
)}
</Grid>
{/* Images */}
</Grid>
</div>
)
}
}
export default Dashboard;
答案 0 :(得分：1)
onClick ={() => this.writeComment(image.id)} //id of your item
writeComment = (id) => {
this.setState({
isComment: this.state.isComment ? '' : id // check if you state is filled to toggle on/off comment
})
}
{this.state.isComment === image.id ? <Comment onSubmit={this.commentSubmit} commentBody={this.state.comment_body} commentChange={this.handleCommentChange}/> : null}