Simple method for implementing a fade effect on a React component with raw JavaScript techniques?

I am seeking a way to have my React component smoothly fade in upon being mounted. The component's outermost DIV starts with inline style display:none. Within the componentDidMount() method, I've written the following code:

let el = document.querySelector('.myElement');
el.style.transition="opacity 2s";
el.style.opacity=1;

Despite these efforts, the components remain hidden when rendered. Adding el.style.display='block'; results in an instant appearance without the desired fade-in effect.

I experimented with jQuery's fadeIn method and achieved the intended outcome:

$(el).fadeIn(2000);

This prompts the question: is it feasible to achieve this using pure JavaScript?

Note: This specific component is utilized in two scenarios - when a new component is added to the page, and when an existing component loads data from the database on page load. I only aim to have the fade-in transition occur when a new component is included on the page.

javascriptfadein

Answer №1

It's actually quite simple.

Inside your react component:

componentDidMount() {
  let element = document.querySelector('.myElement');
  element.classList.add('fade-in');
}

In your stylesheet:

.myElement {
  opacity: 0;
  transition: 2s opacity;
}

.fade-in {
  opacity: 1;
}

Upon mounting your component, it will initially have an opacity: 0, followed by the addition of a fade-in class that will change its opacity to 1 with a 2-second transition effect.

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