I'm having an issue where React seems to be rendering a deleted array element after I've removed it from an array in the components state. After setState(), rendering is triggered, but the deleted item is shown, instead of the remaining item (see GIF video below).
Although the component is extremely simple and I've spent hours on this problem, I haven't been able to solve this issue. The strange thing is that the newState object actually contains the valid new list, but it's not rendered.
I really hope someone can help me figure this out!
import React from "react";
import Button from "@material-ui/core/Button";
import update from "immutability-helper";
import Grid from "@material-ui/core/Grid";
import TextField from "@material-ui/core/TextField";
import * as R from "ramda";
class SessionNoteGroup extends React.Component {
state = {
id: this.props.id,
notes: this.props.notes
};
render() {
const { classes } = this.props;
const { id, notes } = this.state;
return (
<div>
<Grid container>
<Grid item xs={12}>
<TextField
multiline
fullWidth
id="notes"
name="notes"
label="Notes"
rows="2"
value={notes}
onChange={this.handleValueChange}
/>
</Grid>
</Grid>
<Button variant="outlined" color="primary" onClick={this.handleDelete}>
Delete
</Button>
</div>
);
}
handleValueChange = event => {
const { name, value } = event.target;
const { id, notes } = this.state;
let newState = {
id: id,
notes: value
};
this.setState(newState);
};
handleDelete = () => {
this.props.onDelete(this.state.id);
};
}
class SessionNotes extends React.Component {
state = {
notes: this.props.notes.slice(),
deleted: []
};
next_id = 2;
createNotes = () => {
let notesList = [];
for (let i = 0; i < this.state.notes.length; i++) {
const { id, notes } = this.state.notes[i];
notesList.push(
<SessionNoteGroup
id={id}
notes={notes}
onDelete={this.handleDelete}
index={i + 1}
/>
);
}
console.log(notesList);
return notesList;
};
handleDelete = id => {
const newNotes = R.filter(note => note.id !== id, this.state.notes);
this.setState({ notes: newNotes });
};
handleClickAdd = async () => {
const note = {
id: this.next_id,
notes: ""
};
this.next_id++;
const newState = update(this.state, { notes: { $push: [note] } });
this.setState(newState);
};
render() {
return (
<div>
{this.createNotes()}
<Button
variant="outlined"
color="primary"
onClick={this.handleClickAdd}
>
Add
</Button>
</div>
);
}
}
export default SessionNotes;