Changing CSS class on button click in React.js app

Question

Changing CSS class on button click in React.js app

Is there a way to add a blur effect to my background when a user clicks a specific button? I want to update my CSS class accordingly.

Below is the current CSS class:

.post_options {
    width: 100%;
    height: 100%;
    float: left;
    background-color: #eceff1;
    position: fixed;
}

I would like to modify it to apply a blur effect when the user clicks the button:

.post_options {
    width: 100%;
    height: 100%;
    float: left;
    background-color: #eceff1;
    position: fixed;
    -webkit-filter: blur(5px);
    -moz-filter: blur(5px);
    -o-filter: blur(5px);
    -ms-filter: blur(5px);
    filter: blur(5px);
}

Here is the button that should trigger the background blur:

<button className="preview_btn" href="#postpreview" onClick={this.preview}>Preview</button>

Note: This implementation is in React.

When trying to create a separate div with background effects, the contents inside also get blurred. How can this be addressed?

javascript html css reactjs

Answer 1

Answer №1

Implement state logic within your component:

 this.state = {
    blur: false; 
  }

Create a method to handle button click events. This method will update the state and trigger a re-render.

 handlePreviewClick() {
    this.setState = {
      blur:true;
    }
}

Modify your button component based on the 'blur' state by adding specific classes.

//The following code applies the 'blur' class when the button is clicked
<button className={this.state.blur?'blur':''} onClick={this.handlePreviewClick}>Preview</button>

View example on Codepen

Answer 2

Implement state logic within your component:

 this.state = {
    blur: false; 
  }

Create a method to handle button click events. This method will update the state and trigger a re-render.

 handlePreviewClick() {
    this.setState = {
      blur:true;
    }
}

Modify your button component based on the 'blur' state by adding specific classes.

//The following code applies the 'blur' class when the button is clicked
<button className={this.state.blur?'blur':''} onClick={this.handlePreviewClick}>Preview</button>

View example on Codepen

Answer 3

Answer №2

To keep it concise, if you are using JSX and Babel, you can utilize ES6 arrow functions. For a live example on codepen, click here.

Styling with CSS

.blur {
    -webkit-filter: blur(5px);
    -moz-filter: blur(5px);
    -o-filter: blur(5px);
    -ms-filter: blur(5px);
    filter: blur(5px);
}

JavaScript Logic

class Section extends React.Component {
  constructor(props) {
    super(props);

    this.state = {
       blur: false
    };
  };

  render() {
    return (
       <section>
        <ul className={this.state.blur ? 'blur' : ''}>
          <li className="post_options">Option 1</li>
          <li className="post_options">Option 2</li>
        </ul>

        <button onClick={this.blur}>Blur</button>
      </section>
    );
  }

  blur = () => {
    this.setState({blur: !this.state.blur})
  };
}

React.render(<Section />, document.body);

Answer 4

To keep it concise, if you are using JSX and Babel, you can utilize ES6 arrow functions. For a live example on codepen, click here.

Styling with CSS

.blur {
    -webkit-filter: blur(5px);
    -moz-filter: blur(5px);
    -o-filter: blur(5px);
    -ms-filter: blur(5px);
    filter: blur(5px);
}

JavaScript Logic

class Section extends React.Component {
  constructor(props) {
    super(props);

    this.state = {
       blur: false
    };
  };

  render() {
    return (
       <section>
        <ul className={this.state.blur ? 'blur' : ''}>
          <li className="post_options">Option 1</li>
          <li className="post_options">Option 2</li>
        </ul>

        <button onClick={this.blur}>Blur</button>
      </section>
    );
  }

  blur = () => {
    this.setState({blur: !this.state.blur})
  };
}

React.render(<Section />, document.body);

Answer 5

Answer №3

While it is technically possible to modify CSS rules using JavaScript, I strongly advise against taking this approach. For more information, you can refer to Changing a CSS rule-set from Javascript

Instead, consider utilizing the following two CSS classes:

.post_options {
    width: 100%;
    height: 100%;
    float: left;
    background-color: #eceff1;
    position: fixed;
}

.filter_blur {
    -webkit-filter: blur(5px);
    -moz-filter: blur(5px);
    -o-filter: blur(5px);
    -ms-filter: blur(5px);
    filter: blur(5px);
}

Your button should then trigger an update in the state on click, indicating that your post_options should render with the filter_blur class. The implementation of this functionality will vary depending on the structure of your app, whether it is based on flux or redux architectures or simple lifecycle components.

Answer 6

While it is technically possible to modify CSS rules using JavaScript, I strongly advise against taking this approach. For more information, you can refer to Changing a CSS rule-set from Javascript

Instead, consider utilizing the following two CSS classes:

.post_options {
    width: 100%;
    height: 100%;
    float: left;
    background-color: #eceff1;
    position: fixed;
}

.filter_blur {
    -webkit-filter: blur(5px);
    -moz-filter: blur(5px);
    -o-filter: blur(5px);
    -ms-filter: blur(5px);
    filter: blur(5px);
}

Your button should then trigger an update in the state on click, indicating that your post_options should render with the filter_blur class. The implementation of this functionality will vary depending on the structure of your app, whether it is based on flux or redux architectures or simple lifecycle components.

Answer 7

Answer №4

Custom Styling

In React, the style attribute allows you to define custom styles using a JavaScript object with camelCased properties instead of a CSS string. This approach is in line with the DOM style property in JavaScript, offering better efficiency and enhancing security by preventing XSS vulnerabilities. For instance:

const divStyles = {
  color: 'red',
  backgroundColor: 'url(' + imageUrl + ')',
};


function GreetingComponent() {
  return <div style={divStyles}>Greetings from React!</div>;
}

To explore further, visit DOM Elements - React

Answer 8

Custom Styling

In React, the style attribute allows you to define custom styles using a JavaScript object with camelCased properties instead of a CSS string. This approach is in line with the DOM style property in JavaScript, offering better efficiency and enhancing security by preventing XSS vulnerabilities. For instance:

const divStyles = {
  color: 'red',
  backgroundColor: 'url(' + imageUrl + ')',
};


function GreetingComponent() {
  return <div style={divStyles}>Greetings from React!</div>;
}

To explore further, visit DOM Elements - React

Answer 9

Answer №5

My suggestion is to follow Thomas' advice or you have the option to trigger this function upon clicking

function modify_post_options(){
 var x = document.getElementsByClassName("post-options");
 x[0].style.filter= "blur(5px)";
 x[0].style.-webkit-filter= "blur(5px)";
 x[0].style.-moz-filter= "blur(5px)";
 x[0].style.-o-filter= "blur(5px)";
 x[0].style.-ms-filter= "blur(5px)";
}

Answer 10

My suggestion is to follow Thomas' advice or you have the option to trigger this function upon clicking

function modify_post_options(){
 var x = document.getElementsByClassName("post-options");
 x[0].style.filter= "blur(5px)";
 x[0].style.-webkit-filter= "blur(5px)";
 x[0].style.-moz-filter= "blur(5px)";
 x[0].style.-o-filter= "blur(5px)";
 x[0].style.-ms-filter= "blur(5px)";
}

Answer 11

Answer №6

Why not create a new class and switch between the classes?

To achieve this, all you have to do is transfer the modified effects into a different class, for example post_options_clicked, and then toggle a component state when the button is clicked within that method.

Imagine you have a basic component like so:

const ExampleComponent = React.createClass({
    getInitialState() {
        return({
            toggled: false
        });
    },

    toggleState() {
        if(this.state.toggled){
            this.setState({ toggled:false });
        }else{
            this.setState({ toggled:true });
        }
    },

    render() {
        return(
            <div>
               {
                this.state.toggled
                ?
                <div className="post-options-clicked">
                  //Your Code goes here
                </div>
                :
                <div className="post-options">
                  //Your Code goes here
                </div>
               }
               <button 
                 className="preview_btn" 
                 href="#postpreview" 
                 onClick={this.toggleState}
               >
               Preview
               </button>
            </div>
        )
    },
)}

Answer 12

Why not create a new class and switch between the classes?

To achieve this, all you have to do is transfer the modified effects into a different class, for example post_options_clicked, and then toggle a component state when the button is clicked within that method.

Imagine you have a basic component like so:

const ExampleComponent = React.createClass({
    getInitialState() {
        return({
            toggled: false
        });
    },

    toggleState() {
        if(this.state.toggled){
            this.setState({ toggled:false });
        }else{
            this.setState({ toggled:true });
        }
    },

    render() {
        return(
            <div>
               {
                this.state.toggled
                ?
                <div className="post-options-clicked">
                  //Your Code goes here
                </div>
                :
                <div className="post-options">
                  //Your Code goes here
                </div>
               }
               <button 
                 className="preview_btn" 
                 href="#postpreview" 
                 onClick={this.toggleState}
               >
               Preview
               </button>
            </div>
        )
    },
)}

Changing CSS class on button click in React.js app

Answer №1

Answer №2

Styling with CSS

JavaScript Logic

Answer №3

Answer №4

Answer №5

Answer №6

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