how to add input data to list in react js?

Question

I am trying to make a Todo application but i am stuck,I am not able to proceed further. Please help

var Todo= React.createClass({
    save() {
      this.refs.newText.value
    },

    render(){
        return(
            <div className="list">
              <h1> TO-DO List</h1>
              <input type="text" ref="newtext" defaultValue={this.props.children} />
              <button onclick={this.save} className="btn btn-primary glyphicon glyphicon-floppy-saved">
              </button>
              <ul>
                <li>{this.target.value}</li>
              </ul>
            </div>
        )
    },


});

Please explain your problem a bit more. What's the issue exactly? :) — Chris
– Chris, Commented May 4, 2017 at 13:41
this.target.value will not automatically bind the data to the <li>, if that is what you are expecting. Rather pass the data along with your save function. Manipulate the data and add it to some state of your class and then try binding the state — Saurabh Tiwari
– Saurabh Tiwari, Commented May 4, 2017 at 13:50

Shubham Khatri · Accepted Answer · 2017-05-04 13:50:37Z

1

Maintain a state where in you will add the newly added item and then iterate over it to display in your view. Also you should not be using string refs, rather you should be going for ref callbacks as suggested by the react-docs. Also the onclick on button should be camelcase like onClick

var Todo= React.createClass({
    getInitialState() {
         return {
             todos: []
         }
    },
    save() {
      var todos = [...this.state.todos];
      todos.push(this.newText.value);
      console.log(todos)
      this.setState({todos});
    },

    render(){
        return(
            <div className="list">
              <h1> TO-DO List</h1>
              <input type="text" ref={(ip) => {this.newText = ip}}/>
              <button onClick={this.save} className="btn btn-primary glyphicon glyphicon-floppy-saved">Save
              </button>
              <ul>
                {this.state.todos.map(function(todo) {
                      return <li>{todo}</li>
                 })}
                
              </ul>
            </div>
        )
    },


});

ReactDOM.render(<Todo/>, document.getElementById('app'));

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.0.2/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.0.2/react-dom.min.js"></script>
<div id="app"></div>

answered May 4, 2017 at 13:50

Shubham Khatri

284k58 gold badges431 silver badges411 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Mayank Bhanagay Over a year ago

Thanks,can you let me know what exactly ref={(ip) => {this.newText = ip}} is doing ??

Moe Over a year ago

React will call the ref callback with the DOM element when the component mounts, and call it with null when it unmounts. Using the ref callback just to set a property on the class is a common pattern for accessing DOM elements. The preferred way is to set the property in the ref callback. The shorter way to write it: ref={input => this.textInput = input}.

Shubham Khatri Over a year ago

as @MohamedIsmat said, just as you have used string refs in your question, ref callback does the same work, but is a recommended approach by the react-docs

Moe · Accepted Answer · 2017-05-04 15:53:44Z

To add to Shubnam's answer, consider using ES6 classes and initializing the state in the constructor, since using ES6 classes is the recommended way now. React.createClass is now deprecated and shows a warning on the console. Check this code, notice that you will need to bind the save method.

Check these links for more info:

https://facebook.github.io/react/blog/#migrating-from-react.createclass

https://toddmotto.com/react-create-class-versus-component/

class Todo extends React.Component {
    
    constructor(props) {
      super(props);
      this.state={todos:[]};
    }
    
    save() {
      var todos = [...this.state.todos];
      todos.push(this.newText.value);
      this.setState({todos});
    }

    render(){
        return(
            <div className="list">
              <h1> TO-DO List</h1>
              <input type="text" ref={(ip) => {this.newText = ip}}/>
              <button onClick={this.save.bind(this)} className="btn btn-primary glyphicon glyphicon-floppy-saved">Save
              </button>
              <ul>
                {this.state.todos.map(function(todo) {
                      return <li>{todo}</li>
                 })}
                
              </ul>
            </div>
        )
    }
};

ReactDOM.render(<Todo/>, document.getElementById('app'));

<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"></div>

Roberto Caboni · Accepted Answer · 2020-08-07 12:15:00Z

`` import React, { Component } from 'react'; import Nav from './nav';

class Delete_Contect extends Component {

constructor(props)
{
    super(props);

    this.state={
        name:'vishal',

        name_add:[1,2,4]
     };
    
    this.Change = this.Change.bind(this);
    this.Add_data = this.Add_data.bind(this);
}

Change()
{
    this.setState(
    {
         name:'boss'
    }
  )
}
Add_data(e)
{   
    const newContect = this.newText.value

    this.setState({

       name_add: [...this.state.name_add, newContect]
  
    })
}

render() {
   return (

      <div>

            {this.state.name_add.map((number) => {

                return(

                   <li>{number}</li>

               )

           })}

           <input type="text" ref={(ip) => {this.newText = ip}} />

           <button onClick={this.Add_data}>submit</button>        

         </div>

    );
}

}

export default Delete_Contect;

Collectives™ on Stack Overflow

how to add input data to list in react js?

3 Answers 3

3 Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

3 Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related