I have two components:
Parent component
Child component
I was trying to call Child’s method from Parent, I tried this way but couldn’t get a result:
class Parent extends Component {
render() {
return (
);
}
}
class Child extends Component {
getAlert() {
alert(‘clicked’);
}
render() {
return (
Hello
);
}
}
Is there a way to call Child’s method from Parent?
Note: Child and Parent components are in two different files.
If you have to expose an imperative method on a child component, you can use refs. First off, let me say, this is generally not the way to do things in React land. What do you want is pass down functionality to children in props and pass up notifications from children during events (or better yet: dispatch) if you need to show an escape hatch and usually indicates that an improved design is available.\n\nPreviously, refs were only supported for Class-based components. With the advent of React Hooks, that\’s no longer the case.\n\nModern React with Hooks (v16.8+) .\n\nconst forwardRef, useFref; useImperativeHandle – = React; .\n\nWe need to wrap component in forwardRef to gain // access to the ref object given by the prop. // // This ref is passed as the second parameter of the function component. const Child = forwardRf((props, ref) => .\n\nThe second argument useImperativeHandle(ref, () => (), // // The component instance will be extended // with whatever you return from the callback passed //.\n\nalert(\”getAlert from Child\”); getALERt() .\n\nparaphrase )); .\n\nReject h1>Hi/h1,>>;); .\n\n// // you have to assign the child component instance to a ref, so we call one const childRef() to get one Const ChildRf = useRuff(); .\n\nReturn (div> Child ref=childRef />button onClick =() => childRref.current.getAlert()>>Clik/Button> (i.e.\n\nScript src=\”https://unpkg.com/react->, document.getElementById(\’root\’) ); \”spread: http://wwwwww.16/umd/detailtail.js\” crossorigin> \’script>> \”script [swc] [/[/sh]: www.script-sarah_s/strughorc-\” /script \”their-domin_domdom\”@@6/unt-to-retail-top-[[s] [re>//]\n\ndiv id=\”root\”>/div> .\n\n\n\nHere: Documentation for useImperativeHandle(): .\n\nIn use of ref, useImperativeHandle adapts the instance value to parent components.\n\nClass Components (>= [email protected]): Legacy API .\n\nComponent = React; const .\n\nThis.child = React.createRef(); is extended by class Parent to Component ( constructor(props) – super( Props); and this. child = Class Parent.\n\nThis.child.current.getAlert(); ; onClick = () => .\n\nReturn (div>,Child ref=this.child />button onClick =This.onColick>Clik/Button> – i.e.\n\nClass Child extends Component getAlert() ‘’ alert(’getALERt from Child’ – ‘ .\n\nReturn (h1>Hello/h1)>>: render() .\n\nScript src=\”https://unpkg.com/react-backback(\’root\’)), document.getElementById (\’pathpath\’), crossorigin>Script: http://wwwwww.16/umd/detail.js\” Crossoght-script-shrink-wraprap-to-ram-process-trick-and-reacted-development.Js \”short-ad> />>\n\n\n\nCallback Ref API callback-style refs are another approach to achieving this, although it is not quite as common in modern React: Reas.\n\nComponent = React; const ; render . = reactDOM;\n\nClass Parent extends Component render() (div>Child ref=instance => this.child = instance; i.e. /> .button onClick =d – \’\’ this child.getAlert()\’ ; in a class Parent\’s Click/Button>/ d/div] , oselect : ?\n\nClass Child extends Component getAlert() – alert(\’clicked\’) ; .\n\nreturn (h1>Hello/h1,> ); render() .\n\nScript src=\”https://cdnjs.cloudflare.com/ajax/libs/react.15.1.0/reasonson(\’app\’), document.getElementById\” ) ); \”script\”s=\”>>/script> \’script [s] [/[/sh] [ahmnc. / .hc/wrapraps__swwh]. http://wwwwww.\n\ndiv id=\”app\”>/div> .
