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How to implement mobile in css3

Apr 24, 2023 am 09:09 AM

CSS3 realizes mobile

With the popularity of mobile devices and the development of Web applications, we increasingly need to achieve mobile effects in web pages. CSS3 provides some new mobile-related properties, and this article will introduce some of the most commonly used ones.

  1. transform attribute

The transform attribute can change the shape, size, position, etc. of the element. Among them, the translate function can realize the translation of elements. It receives two parameters, representing the translation distance in the horizontal and vertical directions respectively. For example, the following code translates a div element 50 pixels to the right and 50 pixels downward:

div {
  transform: translate(50px, 50px);
}

You can also use a percentage as a parameter in the translate function to represent the translation distance relative to the width and height of the element itself. For example, the following code translates a div element 50% of its width and height to the right and 50% of its height:

div {
  transform: translate(50%, 50%);
}
  1. transition attribute

The transition attribute can be the element's Changes define transition effects. It receives four parameters, representing the changed attributes, transition time, transition type and delay time. For example, the following code defines a 0.5-second smooth transition effect for the transform attribute of a div element:

div {
  transition: transform 0.5s ease;
}

When the value of the transform attribute of the div element changes, it will smoothly transition from the original state to The new state has a duration of 0.5 seconds and a transition type of ease. We can set multiple transition attributes in CSS. For example, the following code defines a transition effect for each of the opacity attribute and transform attribute of a div element:

div {
  transition: opacity 0.5s ease, transform 0.5s ease;
}
  1. keyframes animation

keyframes animation can achieve more complex animation effects. It defines a timeline and defines the state of the element at different points in time. For example, the following code defines an animation effect that moves in from the left:

@keyframes movetoright {
  from {
    transform: translateX(-100%);
  }

  to {
    transform: translateX(0%);
  }
}

div {
  animation: movetoright 1s ease;
}

The timeline of this animation is divided into multiple time points, where from represents the state at the beginning of the animation, and to represents the state at the end of the animation. state. We can define any number of time points on the timeline and set different element states at different time points to achieve more diverse animation effects.

  1. touch event

When interacting on a mobile device, we usually need to listen for touch events. The following are commonly used touch event types:

  • touchstart: triggered when the finger starts to touch the screen;
  • touchmove: triggered when the finger slides on the screen;
  • touchend: Triggered when the finger leaves the screen;
  • touchcancel: Triggered when the system cancels the touch event, such as a sudden call, etc.

For example, in the following code, when the user slides on the div element, the position of the div element will be changed:

<div>
  拖我
</div>

<script>
var box = document.getElementById(&#39;move-box&#39;);
var startX, startY, moveX, moveY;

box.addEventListener(&#39;touchstart&#39;, function(e) {
  var touch = e.touches[0];
  startX = touch.clientX;
  startY = touch.clientY;
});

box.addEventListener(&#39;touchmove&#39;, function(e) {
  var touch = e.touches[0];
  moveX = touch.clientX - startX;
  moveY = touch.clientY - startY;
  box.style.transform = &#39;translate(&#39; + moveX + &#39;px, &#39; + moveY + &#39;px)&#39;;
});
</script>

In this code, we listen to the touchstart event and touchmove event , respectively obtain the initial position and current position of the finger, and calculate the distance the finger moves on the screen. Then, by setting the translate attribute, the translation effect of the div element is achieved.

Summary

The above introduces several of the most commonly used mobile-related properties in CSS3, including transform, transition, keyframes animation and touch events. These properties provide great flexibility for implementing a wide variety of movement effects. When developing web applications, we can flexibly apply these attributes according to specific needs to create a more colorful user experience.

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