Call a method from parent component via props, when clicking on a button

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I'm stuck because of many multiple solutions to the problem I have, but no clear explanation for a beginner like me.

I'm building my first todo list app. I have an App file and a ToDo child component.

From the child Todo, I'm calling the deleteTodo method, included within my parent app component, using props, but the console doesn't display any result when I click on the button.

What am I missing?

ToDo.js (full code)

import React, { Component } from 'react';

class ToDo extends Component { //define a class that extends Component
   render() {
   return (
          <span>{ this.props.description }</span>
          <button onClick ={this.props.deleteTodo}>Delete</button>
export default ToDo; //the component is made to export the data

App.js (for full code:


deleteTodo() {
    console.log("to do deleted");

You need pass deleteTodo to ToDo comoponent

<ToDo key={ index }          
      description={ todo.description }
      isCompleted={ todo.isCompleted }
      toggleComplete={ () => this.toggleComplete(index)}

How to execute child component function from the parent , In order to execute a function from a child component, you will need to use Refs. We are going to create a Parent element, it will render a <Child/> Component { constructor(props) { super(props); this.state = {open: The button that will open the drawer onTouchTap (click or whatever) I'm using 15.4. The showAlert method is the only method that will be accesible in this.refs.child in the parent component. Example. If you didn't understood well the previous example, you can analyze the following implementation. In this example, we are going to use material-ui and 2 of its components, the drawer and a button.

You are not passing deleteTodo method as prop to Todo component

<ToDo key={ index } description={ todo.description } isCompleted={ todo.isCompleted } toggleComplete={ () => this.toggleComplete(index)} isDeleted = {todo.isDeleted}/>

Pass this method as prop to Todo component, and then call it

<ToDo key={ index } description={ todo.description } isCompleted={ todo.isCompleted } toggleComplete={ () => this.toggleComplete(index)} isDeleted = {todo.isDeleted} deleteTodo={this.deleteTodo.bind(this)}/>

How to call child component method from parent? � Issue #909 , child.js' class Parent extends Component { constructor (props) These methods are called through the form submits of the parent component. that needs to be toggled in a child component once that parent button is clicked. In app.js we imported the component <Button/> and using props we passed a method from app.js "sayHello" to a prop we created called whenClicked. In button.js we referenced this.props.whenClicked and passed it to the onClick property. sayHello is now being shared between the two components because we passed the method as a prop to the <Button

In my case, following steps help me same as your case. I hope to help you with my steps.

  1. Define function in parent component to receive props from child component.
  2. In parent component, pass function name to child component by props.
  3. In child component, call props function when button clicked.
  4. You can see result in the parent component from child.

How to call child component method from parent?, Prevent using string references (react/no-string-refs) How to call child component method from parent extends Component { getAlert() { alert("clicked" ); } render() { return getAlert() // undefined } return ( <div> <Child ref="child" /> < button onClick={this. Component { componentDidMount() { this.props. I think we should to have a consideration about the necessity of parent to use the child’s methods.In fact,parents needn’t to concern the method of child,but can treat the child component as a FSA(finite state machine).Parents component to control the state of child component.So the solution to watch the status change or just use the

Passing Functions to Components – React, Pass event handlers and other functions as props to child components: to have access to the parent component in the handler, you also need to bind the function to the console.log('Click happened'); } render() { return <button onClick={this. Make sure you aren't calling the function when you pass it to the component:. Sending data back to the parent, to do this we simply pass a function as a prop from the parent component to the child component, and the child component calls that function. In this example, we will change the Parent state by passing a function to the Child component and invoking that function inside the Child component. import React from 'react'; class Parent extends React.Component { constructor (props) { super (props); this.state = { count: 0 }; this.outputEvent = this.outputEvent.bind

Parent-Child Component Communication ―, Luckily, React makes this simple through a concept called "props." We will write a method in the App component that receives a zipcode and saves it in it's own state. selectedDate will eventually hold the index of the date we click on. You should either call this method from componentWillUnmount or check to ensure that the component is still mounted within the delayed function. Throttle . Throttling prevents a function from being called more than once in a given window of time. The example below throttles a “click” handler to prevent calling it more than once per second.

How to Pass Props Object from Child Component to Parent , In this guide, we'll go through the React props in detail. We'll also look at how we can pass a props object from a child component to a parent component. HelloReact component and invoke it from the main App component, as shown This function gets used as the click handler for our Button component. The parent component has registered its ClickHandler method with the child component. When the button is clicked the parent components method is invoked with the string from the child. Due to the automatic call to StateHasChanged, the message the parent component displays is automatically updated. 2. Cascading Values. The second method we are going to look at is Cascading Values.

  • Make sure you are sending deleteTodo as prop to Todo component like <Todo deleteTodo={this.deleteTodo} />