class Template extends React.Component {
constructor(props) {
super(props)
this.state = {
isMenuVisible: false,
isVideoModelVisible: false,
loading: 'is-loading'
}
this.handleToggleVideoModel = this.handleToggleVideoModel.bind(this)
}
handleToggleVideoModel() {
alert('test handleToggleVideoModel ');
console.log('layout');
this.setState({
isVideoModelVisible: !this.state.isVideoModelVisible
})
}
render() {
const { children } = this.props
return (
{children()}
)
}
}
Template.propTypes = {
children: React.PropTypes.func,
handleToggleVideoModel: React.PropTypes.func
}
export default Template
pages/index.js which is rendered in Above Template file in {children()}
class HomeIndex extends React.Component {
constructor(props) {
super(props);
this.handleToggleVideoModel = this.handleToggleVideoModel.bind(this)
}
render() {
return (
<div>
<Helmet>
<title>{siteTitle}</title>
<meta name="description" content={siteDescription} />
</Helmet>
<Banner onToggleVideoModel=
{this.props.handleToggleVideoModel}/>
)
}
}
HomeIndex.propTypes = {
onToggleVideoModel: React.PropTypes.func
}
export default HomeIndex
components/Banner.js
const Banner = (props) => (
<section id="banner" className="major">
<li><a href="javascript:void(0);" className="button next" onClick=
{props.onToggleVideoModel}>Watch video</a></li>
</section>
)
export default Banner
How can i don that?
handleToggleVideoModel i want to call from Banner.js which is Grand child of layout/index Parent layuts/index.js.
child pages/index.js
grandchild components/Banner.js
I am stuck in this any body has idea that how can i access handleToggleVideoModel from Banner suggest me solutions.
Pass method reference from Component 1 to component 2 like this:
<Component 2 toggle={this.handleToggleVideoModel}/>
Now again pass this reference to Component 4 like this from Component 2
<Component 4 toggle={this.props.handleToggleVideoModel} />
Now you can call this function from Component 4 like this:
this.props.handleToggleVideoModel
Related
I want to pass brand.title to the child component - BrandDetail
This is my try and is not working, it simply renders the child component within the parent component and I want it to be rendered solely on the child component.
Parent component:
class BrandsList extends React.Component {
state = {
brands: [],
};
fetchBrands = () => {
axios.get('http://127.0.0.1:8000/api/brands/').then((res) => {
this.setState({
brands: res.data,
});
});
};
componentDidMount() {
this.fetchBrands();
}
render() {
return (
<div style={{ margin: 22 }}>
{this.state.brands.map((brand) => (
<div key={brand.id}>
<Link to={`/brands/${brand.id}`}>{brand.title}</Link>
<BrandDetail brandName={brand.title} />
</div>
))}
</div>
);
}
}
export default BrandsList;
Child component:
import React, { useEffect, useState } from 'react';
import MyLayout from '../MyLayout/MyLayout';
class BrandDetail extends React.Component {
constructor(props) {
super(props);
}
render() {
return (
<MyLayout>
<div>Yes this is the detail page of {this.props.brandName}</div>
</MyLayout>
);
}
}
export default BrandDetail;
UPDATE:
This is the answer I was looking for.
{ this.state.brands.map(brand =>
<div key={brand.id}>
<Link to={{
pathname: `/brands/${brand.title}`,
state: `${brand.title}`,
}}>{brand.title}
</Link>
</div>
)}
And child component:
<div>Yes this is the detail page of {props.location.state}</div>
I have a Modal component in the Main.js app and I want to trigger it from a different component (in this case Homepage, but I have one component for each page).
I don´t know how to pass a component to be rendered inside the modal.
If it helps I´m using Context API.
App.js
const App = () => {
return (
<div>this is the main app</div>
<Modal />
)
}
ReactDOM.render(<App />, document.getElementById('root'))
Modal.js
class Modal extends Component {
constructor(props) {
super(props)
this.state = {
'open': false
}
}
componentWillReceiveProps(nextProps) {
this.setState({open: nextProps.open})
}
render() {
if (!this.state.open) {
return false
}
return(
<div className="modal">
{this.props.children}
</div>
)
}
}
export default Modal
Homepage.js
class Homepage extends Component {
constructor(props) {
super(props)
this.handleOpenModal = this.handleOpenModal.bind(this)
}
handleOpenModal() {
// here I want to open the modal and pass the <ModalContent /> component
// basically call the <Modal open="true"> from the Main component
}
render() {
return(
<div className="homepage">
<button onClick={this.handleOpenModal}>open the modal</button>
</div>
)
}
}
const ModalContent = () => {
return(
<div>this is the content I want to render inside the modal</div>
)
}
thank you.
I strongly recommend using something like react-modal (npm). It allows you to keep modal content right next to the trigger. It does this by appending a "portal" high up in the DOM and handles appending the content to is.
Your example may look like the following:
import Modal from 'react-modal';
class Homepage extends Component {
constructor(props) {
super(props)
this.state = { modalOpen: false };
this.handleOpenModal = this.handleOpenModal.bind(this)
}
handleOpenModal() {
this.setState({ modalOpen: true });
}
render() {
return(
<div className="homepage">
<button onClick={this.handleOpenModal}>open the modal</button>
<Modal open={this.state.modalOpen}>
<ModalContent />
</Modal>
</div>
)
}
}
const ModalContent = () => {
return(
<div>this is the content I want to render inside the modal</div>
)
}
I am trying to call parent method from child component, but it doesn't work and method in parent element is not triggered. In this example I have only two components where ChildHello calls method in Hello component.
codesandbox
Hello.tsx
import * as React from "react";
interface Props {
itemClicked: () => void;
}
export class Hello extends React.Component<Props, {}> {
constructor(props: Props) {
super(props);
}
itemClicked = val => {
console.log(val);
};
render() {
const { name } = this.props;
return <h1 itemClicked={this.itemClicked}>{this.props.children}</h1>;
}
}
const styles = {
height: "400px"
};
export class ChildHello extends React.Component<Props, {}> {
constructor(props: Props) {
super(props);
}
render() {
return (
<div onClick={this.props.itemClicked} style={styles}>
<Hello>Hello Child</Hello>
</div>
);
}
}
You need to understand parent child relationship
in childHello you are using the click event.
<div onClick={this.props.itemClicked} style={styles}>
<Hello>Hello Child</Hello>
</div>
childhello is called by the index.jsx page
<div style={styles}>
<ChildHello name="CodeSandbox" />
</div>
Here you are not passing any click events. also, hello component is inside the child component which is wrong.
All the parent component should have click method involved and that method should be passed as props.
Like this
Parent:
<div style={styles}>
<Hello name="CodeSandbox" />
</div>
Hello component
render() {
const { name } = this.props;
return <ChildHello itemClicked={this.itemClicked} />;
}
ChildHello
render() {
return (
<div onClick={this.props.itemClicked} style={styles}>
Hello
</div>
);
}
Sandbox demo
So I have a component "itemSelection" and inside of it I map through an api response like this
<div className="row">
{this.state.items.map(i => <Item name={i.name} quantity={i.quantity} />)}
</div>
Here the state of "Item" component
constructor(props){
super(props);
this.state = {
visible: false,
selected: false,
}
}
How could I pass the state of "Item" component to "itemSelection" component?
Sending data back up to your parent component should be done by using props.
Fairly common question, see this post for the long answer.
As according to me, If I understood your question you want to call the state of the child component to the parent component.
//Child.js
import s from './Child.css';
class Child extends Component {
getAlert() {
alert('clicked');
}
render() {
return (
<h1 ref="hello">Hello</h1>
);
}
}
export default withStyles(s)(Child);
//Parent.js
class Parent extends Component {
render() {
onClick() {
this.refs.child.getAlert()
}
return (
<div>
<Child ref="child" />
<button onClick={this.onClick.bind(this)}>Click</button>
</div>
);
}
}
Also, you can get the code reference from the link: https://github.com/kriasoft/react-starter-kit/issues/909
This a little tricky but Maybe, its help you solving your problem.
//Parent.js
class Parent extends Component {
component(props) {
super(props)
this.state = {
test: 'abc'
}
}
ParentFunction = (value) => {
this.state.test = value;
this.setState(this.state);
}
render() {
return (
<div>
<Child
test={this.state.test}
ParentFunction={this.ParentFunction}
/>
</div>
);
}
}
//Child.js
import s from './Child.css';
class Child extends Component {
component(props) {
super(props)
this.state = {
test: props.test
}
}
handleChange = () => {
this.state.test = event.target.value;
this.setState(this.state);
this.handleOnSave()
}
handleOnSave = () => {
this.props.ParentFunction(this.state.test);
}
render() {
return (
<div>
<input type="text" onChange={this.handleChange} />
</div>
);
}
}
export default withStyles(s)(Child);
i'm using ReactJS without FLux or Redux. I want the grand child component can communicate (read/update data) with his grandparents component.
Here's the parent component App:
export default class App extends React.Component {
static propTypes = {
children: React.PropTypes.object.isRequired
};
constructor(props) {
super(props);
this.state = {
tabActive: 0,
};
}
setTabActive(item) {
this.setState({
tabActive: item,
});
}
render() {
return (
<div>
<Header tabActive={this.state.tabActive} />
<Content>
{this.props.children}
</ Content>
<Footer />
</div>
);
}
}
child component Header:
export default class Header extends React.Component {
render() {
return (
<div>
....
<SettingTabBar tabActive={this.props.tabActive} />
</div>
);
}
}
Child of child component SettingTabBar:
export default class SettingTabBar extends React.Component {
constructor(props) {
super(props);
this.state = { activeTab: this.props.tabActive };
}
render() {
if (location.pathname.indexOf('setting') > 0) {
return (
<Tabs activeTab={this.state.activeTab} onChange={tabId => this.setState({ activeTab: tabId })} ripple>
<Tab>SETTING</Tab>
<Tab>CHARTS</Tab>
<Tab>HELP</Tab>
</Tabs>
);
}
return null;
}
}
Are there anyway to make SettingTabBar component can update data to App/Header component via function setTabActive() when onChange?
For communication with grandparent and grandchild, you can use context. It's not recomended, but it's working.
// root component
class App extends React.Component {
constructor(props){
super(props);
this.state = {
activeMenu: "none"
};
}
getChildContext() {
return {
rootCallback: menuName => {
this.setState({activeMenu: menuName});
}
}
}
render() {
return (
<div>
<div>Current active menu is: <strong>{this.state.activeMenu}</strong></div>
<Child />
</div>
);
}
}
// declare childContextTypes at context provider
App.childContextTypes = {
rootCallback: React.PropTypes.function
}
// intermediate child
class Child extends React.Component {
render() {
return (
<div>
<GrandChild />
</div>
);
}
}
// grand child
class GrandChild extends React.Component {
render() {
return (
<div>
{/* get context by using this.context */}
<button
type="button"
onClick={()=>this.context.rootCallback("one")}
>
Activate menu one
</button>
<button
type="button"
onClick={()=>this.context.rootCallback("two")}
>
Activate menu two
</button>
<button
type="button"
onClick={()=>this.context.rootCallback("three")}
>
Activate menu three
</button>
</div>
)
}
}
// also declare contextTypes at context consumer
GrandChild.contextTypes = {
rootCallback: React.PropTypes.function
}
// render it to DOM
ReactDOM.render(<App /> , document.getElementById('app-mount'));
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<div id="app-mount"></div>