There are a few things that are technically incorrect in terms of implementing the React Code.
First, With the ES6 style of writing a class, any function that needs to access the properties of the class must be explicit binded
. In your case, you need to bind the handleSubmit function with arrow function
or binding in constructor
.
See this answer for more details: Why and when do we need to bind functions and eventHandlers in React?
-: , componentWillMount, . setState
componentWillMount
, undefined. componentDidMount
lifecycle .
, AJAX componentDidMount
componentWillMount
: setState , , , setState . setState callback
.
. :
setState
React setState
:
export default class Update extends Component {
constructor(props) {
super(props);
this.state = {
updateClothingItem: {}
};
}
componentDidMount() {
fetchClothingItem(this.props.match.params.postId)
.then(data => {
this.setState(state => {
state.updateClothingItem = data;
return state;
});
console.log("data", data);
console.log("this.state.updateClothingItem",this.state.updateClothingItem)
})
.catch(err => {
console.error("err", err);
});
}
handleSubmit = (data) => { .
console.log("this.state.updateClothingItem", this.state.updateClothingItem);
updateClothingItem(this.state.updateClothingItem.id, data); this.props.router.push("/update");
}
render() {
return (
<div>
<FormUpdate
//onSubmit={this.handleSubmit.bind(this)}
id={this.state.updateClothingItem.id}
name={this.state.updateClothingItem.name}
sleeveLength={this.state.updateClothingItem.sleeveLength}
fabricWeight={this.state.updateClothingItem.fabricWeight}
mood={this.state.updateClothingItem.body}
color={this.state.updateClothingItem.color}
/>
<button
type="submit"
onClick={this.handleSubmit}
className="addItemButton"
>
Button
</button>
</div>
);
}
}