unmountOnExit: This prop defines that when the element is removed from the DOM, it will also be unmounted.classNames: The prefix of CSS properties that are applied when this component enters or exits the DOM.In this case, if the search is completed before 400ms, the loading spinner will not be rendered at all timeout: The milliseconds to wait before the transition is applied.In the board game search, loading is the state from when the user executes the search until the search results are fetched from the API in: A boolean value which, when it evaluates to true, triggers the transitions.Line 2: The CSSTransition receives four props:.Line 1: Import the CSSTransition Component.Let’s implement the transition of the loading spinner first. During this transition, I just want to change the opacity of this element. Second, the table should slowly blend into the page, taking about 2 seconds before it’s fully visible. The spinner should also slowly appear, and when the search is completed, it should also slowly disappear and basically make room for the results table. How could we improve this styling? First, if loading takes longer, I want to show a loading spinner. Sometimes this happens within a second, and sometimes it takes several seconds. As I said before, the results are rendered instantaneous: The table with all rows just plops in. Render a search result table where each row represents one itemĭepending on the search term, the list of items can be anything between 0 and up to 100 games or more.For each item in this list, make another API call to load the board games details.When searching for a board game, my app executes these steps: exit: The element is removed from the DOM.exit-active: The element is being removed from the DOM.enter-active: The element is active in the DOM.Explained in a nutshell: When an element is added to the DOM, and when it is removed from the DOM, CSS classes are applied to these elements. Based on this, the library CSSTransition helps to apply styling during this transition. React keeps track of elements there are entering or leaving the real DOM. In a React app, all changes to the DOM are first realized in the virtual DOM, and then synced with the real DOM through the process called reconciliation. ![]() Now, let’s see how to apply transitions in a React app. ![]() This looks very nice! And it can be realized with only one line of CSS - see the following snipped, last declaration.Įnter fullscreen mode Exit fullscreen mode Let’s see the button changing its style with the enabled transition: Instead of this, we can gradually apply the new CSS styles with the CSS transition-property: You define for which properties the transition effect takes place, and you define the delay and the duration of this effect. This state change is instantaneous: The new CSS properties are applied immediately. When you hover this button, it changes to rounded corners, and the color becomes lighter. The button is rendered with square borders, and an orange background. It appeared, well, too fast! I was missing smooth transitions: Blend in effects, or element that move into the screen. ![]() You execute a search, and the search result table just plops in. You click on a link, and the next page is there.
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