How would i see updated props without refreshing - reactjs

Question

How to update the state of the props when a user likes a post?
The props would need to automatically update when a user clicks like.
Currently, a user can like a post, and only on page refresh I am able to see the updated number of likes, which shows on
{this.props.likeCount}
What Component lifecycle would be best for seeing the updated props without refreshing the page? this application is using redux.
Like.js
import React, { Component } from 'react';
import ReactDOM from 'react-dom'
import { FontAwesomeIcon } from '#fortawesome/react-fontawesome';
import { faCoffee, faAdjust } from '#fortawesome/free-solid-svg-icons';
import {connect} from 'react-redux';
import { getLikeCount} from '../actions/';
class Like extends Component{
constructor(props){
super(props);
this.state = {
likes: null
}
}
getLikes = (id) => {
// console.log(id);
this.props.getLikeCount(id)
console.log(this.props.likeCount)
}
render(){
return(
<div style={{float:'right', fontSize: '1.5em', color:'tomato'}} >
<i style={{ marginRight: '140px'}} className="fa fa-heart-o">
<span style={{ marginLeft: '6px'}}>
<a href="#" onClick={this.props.like}>Like </a>
{this.getLikes(this.props.postId)}
</span>
{/* gets the like counts */}
{this.props.likeCount}
</i>
</div>
)
}
}
const mapStateToProps = (state) => ({
isEditingId: state.post.isEditingId,
likeCount:state.post.likes
})
const mapDispatchToProps = (dispatch) => ({
// pass creds which can be called anything, but I just call it credentials but it should be called something more
// specific.
getLikeCount: (id) => dispatch(getLikeCount(id)),
// Pass id to the DeletePost functions.
});
export default connect(mapStateToProps, mapDispatchToProps)(Like);
Actions.js
export const getLikeCount = (id) => {
return (dispatch, getState) => {
return Axios.get(`/api/posts/likes/count/${id}`)
.then( (res) => {
const data = res.data
console.log(data);
dispatch({type: GET_LIKES_COUNT, data})
})
}
}
Reducer
import { GET_LIKES_COUNT} from '../actions/';
const initialState = {
post: [],
postError: null,
posts:[],
isEditing:false,
isEditingId:null,
likes:[],
postId:null
}
export default (state = initialState, action) => {
switch (action.type) {
case GET_LIKES_COUNT:
// console.log(action.data)
return({
...state,
likes:action.data
})
default:
return state
}
}
edit(im getting a wierd infinite post loop)
wierd error

Answer 1

Update the code to the following code.
GET_LIKES_COUNT handles the api action, of getting the number of likes for a post.
Without it, it will be always set to 0 likes on render.
ADD_LIKE action gives it the functionality of updating the state without refreshing the page.(i know that their is more specific term they call this in react, maybe its re-rendering) Update the state without re-rendering the component as well as the most important part which is making the api call to the backend to allow the user to like a post. We set likes to 0 to make it possible to upvote the state and it to have it updated without refresh.
Thanks for the assistance #novonimo.
Reducer
import { GET_LIKES_COUNT, ADD_LIKE} from '../actions/';
const initialState = {
post: [],
postError: null,
posts:[],
isEditing:false,
isEditingId:null,
likes:0,
postId:null
}
export default (state = initialState, action) => {
switch (action.type) {
// get number of likes from api
case GET_LIKES_COUNT:
// console.log(action.data)
return({
...state,
likes:action.data
})
case ADD_LIKE:
return({
...state,
likes: state.likes + 1
})
default:
return state
}
}
Actions
export const postLike = (id) => {
return (dispatch) => {
// console.log(userId);
return Axios.post('/api/posts/like', {
postId: id
}).then( (like) => {
dispatch({type: ADD_LIKE})
// console.log('you have liked this', like)
}).catch( (err)=> {
console.log('there seem to be an error', err);
})
}
}
export const getLikeCount = (id) => {
return (dispatch, getState) => {
return Axios.get(`/api/posts/likes/count/${id}`)
.then( (res) => {
const data = res.data
console.log(data);
dispatch({type: GET_LIKES_COUNT, data})
})
}
}
PostItem.js
import React, { Component } from 'react';
import Paper from '#material-ui/core/Paper';
import Button from '#material-ui/core/Button';
import Typography from '#material-ui/core/Typography';
import moment from 'moment';
import Editable from './Editable';
import {connect} from 'react-redux';
import {UpdatePost, getLikeCount, postLike} from '../actions/';
import Like from './Like';
import Axios from '../Axios';
const Styles = {
myPaper: {
margin: '20px 0px',
padding: '20px'
},
button:{
marginRight:'30px'
}
}
class PostItem extends Component{
constructor(props){
super(props);
this.state = {
disabled: false,
}
}
onUpdate = (id, title) => () => {
// we need the id so expres knows what post to update, and the title being that only editing the title.
if(this.props.myTitle !== null){
const creds = {
id, title
}
this.props.UpdatePost(creds);
}
}
clickLike = (id) => () => {
this.props.postLike(id);
}
render(){
const {title, id, userId, removePost, createdAt, post_content, username, editForm, isEditing, editChange, myTitle, postUpdate, likes} = this.props
return(
<div>
<Typography variant="h6" component="h3">
{/* if else teneray operator */}
{isEditing ? (
<Editable editField={myTitle ? myTitle : title} editChange={editChange}/>
): (
<div>
{title}
</div>
)}
</Typography>
<Typography component="p">
{post_content}
<h5>
by: {username}</h5>
<Typography color="textSecondary">{moment(createdAt).calendar()}</Typography>
<Like like={this.clickLike(id)} postId={id}/>
</Typography>
{!isEditing ? (
<Button variant="outlined" type="submit" onClick={editForm(id)}>
Edit
</Button>
):(
// pass id, and myTitle which as we remember myTitle is the new value when updating the title
<div>
<Button
disabled={myTitle.length <= 3}
variant="outlined"
onClick={this.onUpdate(id, myTitle)}>
Update
</Button>
<Button
variant="outlined"
style={{marginLeft: '0.7%'}}
onClick={editForm(null)}>
Close
</Button>
</div>
)}
{!isEditing && (
<Button
style={{marginLeft: '0.7%'}}
variant="outlined"
color="primary"
type="submit"
onClick={removePost(id)}>
Remove
</Button>
)}
</div>
)
}
}
const mapStateToProps = (state) => ({
isEditingId: state.post.isEditingId,
})
const mapDispatchToProps = (dispatch) => ({
// pass creds which can be called anything, but i just call it credentials but it should be called something more
// specific.
UpdatePost: (creds) => dispatch(UpdatePost(creds)),
getLikeCount: (id) => dispatch(getLikeCount(id)),
postLike: (id) => dispatch( postLike(id))
// Pass id to the DeletePost functions.
});
export default connect(null, mapDispatchToProps)(PostItem);
Like.js
import React, { Component } from 'react';
import ReactDOM from 'react-dom'
import { FontAwesomeIcon } from '#fortawesome/react-fontawesome';
import { faCoffee, faAdjust } from '#fortawesome/free-solid-svg-icons';
import {connect} from 'react-redux';
import { getLikeCount} from '../actions/';
class Like extends Component{
constructor(props){
super(props);
this.state = {
likes: null
}
}
getLikes = (id) => {
// console.log(id);
this.props.getLikeCount(id)
console.log(this.props.likeCount)
}
render(){
return(
<div style={{float:'right', fontSize: '1.5em', color:'tomato'}} >
<i style={{ marginRight: '140px'}} className="fa fa-heart-o">
<span style={{ marginLeft: '6px'}}>
<a href="#" onClick={this.props.like}>Like </a>
{this.getLikes(this.props.postId)}
</span>
{/* gets the like counts */}
{this.props.likeCount}
</i>
</div>
)
}
}
const mapStateToProps = (state) => ({
isEditingId: state.post.isEditingId,
likeCount:state.post.likes
})
const mapDispatchToProps = (dispatch) => ({
getLikeCount: (id) => dispatch(getLikeCount(id)),
// Pass id to the DeletePost functions.
});
export default connect(mapStateToProps, mapDispatchToProps)(Like);

Answer 2

React philosophy is based on remove Refresh pages on changes.
so forget refresh in all react app.
in the component you can change code like this:
handleAddUpVote = ()=> this.props.dispatch(addUpVote())
return(
<div onClick={this.handleAddUpVote}> sth </div>
)
and in action:
const ADD_UP_VOTE = "ADD_UP_VOTE";
const addUpVote = ({type: ADD_UP_VOTE});
export {ADD_UP_VOTE, addUpVote}
and finally, change your reducer:
initialState={
voteCounter: 0
}
const Reducer = (state=initialState, action) => {
switch(action.type){
case(ADD_UP_VOTE):
return{
...state,
voteCounter: state.voteCounter + 1
};
}
}