Get input value on Click in React

Question

I'm trying to get the value of input onClick(not onChange) and I got really confused. (the function should take user input and multiply it by 5)

var Multiply = React.createClass({
  getInitialState: function(){
    return {number: '-'}

  },
  multiply: function(a){
    return (a * 5);
  },
 handleChange: function(e) {
    this.setState({ number: e.target.value });
  },
  handleClick: function(e) {

    this.multiply(this.state.number);
  },

  render: function () {
    return (
      <div>
        <p>multiply by 5!</p><br />
      <textarea onChange={this.handleChange}>
      </textarea><br/>
        <button  onClick={this.handleClick}>Submit</button>
        <p>result:</p> {this.state.result}

      </div>
    );
  }
});
ReactDOM.render(
    <Multiply/>,
    document.getElementById('root')
);

Here is a link to code: http://codepen.io/polinaz/pen/MmezZy?editors=0010

What's wrong with my logic? Will really appreciate a good explanation! Thank you

Jayce444 · Accepted Answer · 2017-04-23 12:19:30Z

1

When you click the button, it multiples the number by 5, but then you don't do anything with that multiplied number (the result). In your handleClick function you need something like this:

handleClick: function(e) {
    this.setState({result: this.multiply(this.state.number)});
}

answered Apr 23, 2017 at 12:19

Jayce444

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2 Comments

Etoya Over a year ago

Thank you for the explanation! Only now I noticed that my this.state.result does nothing

Jayce444 Over a year ago

what do you mean this.state.result 'does nothing'?

Dream_Cap · Accepted Answer · 2017-04-23 12:25:32Z

0

I added result to the state, and added a result variable into the multiply function so you can store it in the state. Please look below:

    var Multiply = React.createClass({
  getInitialState: function(){
   //added result to the initial state here 
    return {number: '-',
           result: 0}

  },
  multiply: function(a){
   //added result var here, and set the state to accept this result
    var result = a * 5;
    this.setState({result: result});
  },
 handleChange: function(e) {

    this.setState({ number: e.target.value });
  },
  handleClick: function(e) {

    this.multiply(this.state.number);
  },

  render: function () {
    return (
      <div>
        <p>multiply by 5!</p><br />
      <textarea onChange={this.handleChange}>
      </textarea><br/>
        <button  onClick={this.handleClick}>Submit</button>
        <p>result:</p> {this.state.result}

      </div>
    );
  }
});
ReactDOM.render(
    <Multiply/>,
    document.getElementById('root')
);

answered Apr 23, 2017 at 12:25

Dream_Cap

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2 Comments

Etoya Over a year ago

Thank you so much!!

Dream_Cap Over a year ago

Your welcome. Please check the checkmark to the left of whichever answer helped you. :)

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