Displaying elements upon checkbox selection in React

Hello, I'm new to React and I am facing an issue with checkbox click handling in React. My goal is to display a div when a checkbox is checked and hide the div when the checkbox is unchecked.

The current implementation only shows the div when the checkbox is clicked, but it does not remove the div when the checkbox is unchecked. How can I achieve this functionality in React?

class QuestionOverlay extends Component {

    constructor() {

        super();

        this.showComments = this.showComments.bind(this);

        this.state = {

            showComponent: false,
        };

    }


    showComments = (e) => {

        this.setState({

            showComponent: true,

        });

    }

    render() {

           return (

                <div className="add_checkbox">

                   <span>Enable Comments</span>
                   <input className="checkbox" type="checkbox" name="enable_comment" onClick={this.showComments} value="enable_comment"/>

                </div>



                {this.state.showComponent ? <div  className="comments_preview_sample"></div> : null}

        )
    }
}

Answer №1

The issue is that you continuously set the value of showComponent=true. To solve this, make sure to reset the state variable when the checkbox is unchecked. Here's an example:

showComments(e){

    this.setState({
        showComponent: e.target.checked,
    });

}

You can see a working example here: https://jsfiddle.net/mrqutgbz/

Here are a few things you should update:

*Avoid returning 2 elements from render, consolidate any conditional rendering within the main div.

*Remove the unnecessary second binding of the showComments method using an arrow function.

*Ensure that the div being rendered conditionally has some content inside it.

Answer №2

It's important to update your onClick listener to onChange. Additionally, make sure to rename showComments to toggleComments and set up the function as follows:

handleToggle(e) {
  this.setState({ displayComments: e.target.checked });
}

Answer №3

We have identified a few syntax errors in your code:

  1. A function defined within a class cannot use the = assignment method.
  2. The React render function requires a root container element, such as a div tag.

const { Component } = React;
const { render } = ReactDOM;

class QuestionOverlay extends Component {
constructor(props) {
super(props);
this.state = {
showComponent: false
}
this.showComments = this.showComments.bind(this);
}

showComments() {
this.setState({
showComponent: !this.state.showComponent
});
}

render() {
return (
<div>
<div className="add_checkbox">
Enable Comments <br/>
<input type="checkbox" onClick={this.showComments} />
</div>
{this.state.showComponent ? <div className="comments_preview_sample">comments</div> : null}
</div>
);
}
}

render(
<QuestionOverlay />,
document.getElementById('root')
);
<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="root"></div>

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