I am new in React ES6 and I think I am modifying the state in a wrong way. My code is like this when I set state on parent component:
class App extends React.Component {
constuctor(props) {
super(props);
this.state = {name:"helloworld"};
}
render() {
return(
<ChildComponent parentObj={this} /> // parentObj for parent context as props on child components
);
}
}
My problem is in other child components, I have to do it repeatitively, is there another way of doing it? I have no problem with React.createClass, but I want to code in es6 so i have this problem.
If you wanna pass the state {name:"helloworld"} do it like that:
class App extends React.Component {
constuctor(props) {
super(props);
this.state = {name:"helloworld"};
}
render() {
return(
<ChildComponent {...this.state} />
);
}
}
and in the child component you can do:
<Text>{this.props.name}</Text>
But If you want to pass the props of the component to it's child:
class App extends React.Component {
constuctor(props) {
super(props);
this.state = {name:"helloworld"};
}
render() {
return(
<ChildComponent {...this.props} />
);
}
}
and in the child component you can do:
<Text>{this.props.stuff}</Text>//place stuff by any property name in props
Now if you want to update the state of parent component from the child component you will need to pass a function to the child component:
class App extends React.Component {
constuctor(props) {
super(props);
this.state = {name:"helloworld"};
}
update(name){
this.setState({name:name})// or with es6 this.setState({name})
}
render() {
return(
<ChildComponent {...this.props, update: this.update.bind(this)} />
);
}
}
and then in child component you can use this : this.props.update('new name')
UPDATE
use more es6 and removed constructor
class App extends React.Component {
state = {name:"helloworld"};
// es6 function, will be bind with adding .bind(this)
update = name => {
this.setState({name:name})// or with es6 this.setState({name})
}
render() {
// notice that we removed .bind(this) from the update
return(
//send multiple methods using ','
<ChildComponent {...this.props, update = this.update} />
);
}
}
if you want to send the whole state :
return( <ChildComponent {...this.state} /> );
But this is likely a bad idea :)
edit: in your scenario, this sends a 'name' property to child component with value 'helloworld'