How to use CSS to create a web page loading progress bar implementation steps

How to use CSS to create a web page loading progress bar implementation steps

In modern web design, loading speed is crucial to user experience. In order to improve the user experience, you can use CSS to create a web page loading progress bar so that users can clearly understand the web page loading progress. This article will introduce the implementation steps of using CSS to create a web page loading progress bar, and provide specific code examples.

Step 1: HTML structure
First, you need to add a div element representing the progress bar in HTML, as shown below:

<div class="progress-bar"></div>

Step 2: CSS style
Next , use CSS styles to beautify the progress bar. Set the style, color, size and other properties of the progress bar. Here is a basic CSS style example:

.progress-bar {
  width: 100%;
  height: 5px;
  background-color: #ccc;
}

This CSS code will create a progress bar with a width of 100% and a height of 5px, and set the background color to gray.

Step 3: Loading progress animation
In order to make the progress bar show a loading effect, you can use CSS animation to achieve it. In the following example, the progress bar will gradually fill from 0% to 100% within 5 seconds:

.progress-bar {
  width: 0%;
  height: 5px;
  background-color: #ccc;
  animation: progress 5s both;
}

@keyframes progress {
  0% {
    width: 0%;
  }
  100% {
    width: 100%;
  }
}

In this CSS code, the width of the progress bar is set from 0% to 100% through keyframe animation. animation effect. Through the animation attribute, the animation name progress and duration 5s are specified, and the keyword both is used to indicate that the last animation state is maintained after the animation ends.

Step 4: Loading completion effect
Finally, you can add some transition effects to make the progress bar disappear after the web page is completely loaded. The following example will make the progress bar gradually disappear after loading is completed:

.progress-bar {
  width: 0%;
  height: 5px;
  background-color: #ccc;
  animation: progress 5s both;
  transition: width 0.3s ease-in;
}

body.loaded .progress-bar {
  width: 100%;
}

body.loaded .progress-bar {
  width: 0%;
}

In this CSS code, a 0.3-second gradient effect is added to the width of the progress bar through the transition attribute, and after the web page is loaded, the JavaScript adds the loaded class name to the body element to gradually change the width of the progress bar to 0%, thereby achieving the effect of the progress bar disappearing.

Through the above four steps, you can use CSS to create a web page loading progress bar. By adjusting CSS styles and animation effects, you can customize the appearance and animation effects of the progress bar according to your needs. In practical applications, JavaScript code can be combined to control the loading status of the progress bar and dynamically update the width of the progress bar based on the actual loading progress.

I hope this article will be helpful to you in learning CSS to create a web page loading progress bar!

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