React component not displaying styles applied with jQuery

While jQuery appears to be functioning properly within a React component, I am facing issues when trying to apply styling using jQuery in the same component. The console.log(eachVisitedTopic) statement within the loop is providing the expected results.

topicsVisited(arr){
     $(function() {
      $.each(arr, function(key, eachVisitedTopic) {
        console.log(eachVisitedTopic);
        $('.single-topic[data-topic-id="' + eachVisitedTopic + '"]').css({
          'background-color': 'red'
        });
      });
    });
  };

Markup

import {React, ReactDOM} from '../../../../build/react';

export default class SingleTopicBox extends React.Component {
  render() {
    return (
      <div>
        <div className="col-sm-2">
          <div className="single-topic" data-topic-id={this.props.topicID} onClick={() => this.props.onClick(this.props.topicID)}>
            {this.props.label}
            {this.props.topicID}
          </div>
        </div>
      </div>
    );
  }
};

Answer №1

React's duty is to handle all rendering processes efficiently by checking the dirty DOM and only updating elements that have changed.

To achieve your desired outcome, simply utilize React state management. When a setState change is triggered, React will analyze the DOM for changes and render accordingly.

For more information, refer to: https://facebook.github.io/react/docs/component-api.html#setstate

constructor() {
        super();
        this.state = {
            bgDisplayColor: "blue"
        };
    }  

In your component, you can implement the following logic:

$('.single-topic[data-topic-id="' + eachVisitedTopic + '"]').css({
          'background-color': this.state.bgDisplayColor
        });

To update it, simply use:

this.setState({bgDisplayColor: "red"});

EDIT

If encountering an undefined variable error, remember to store the scope of "this" within your function before using it in jQuery methods. In the context of jQuery, "this" refers to the jQuery object and not your class instance.

Here's an example illustrating this concept:

topicsVisited(arr){
   var self = this;
   $(function(){
      $.each(arr, function(key, eachVisitedTopic){
         console.log(eachVisitedTopic);
         //self here represents the global scope of your class
         //Within jQuery.css, "this" refers to the jQuery object and not your class instance
         $('.single-topic[data-topic-id="' + eachVisitedTopic + '"]').css({
                  'background-color': self.state.bgDisplayColor
                });
        });
      });
    });
  };

Answer №2

To test this out, ensure you encapsulate all jQuery scripts within the componentDidMount method as shown below:

      componentDidMount() {
         //Insert your jQuery logic here
      }

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