How to use Layui to achieve image switching and stretching effects

How to use Layui to achieve image switching and stretching effects

In recent years, with the rapid development of Web front-end technology, more and more frameworks and libraries have been used To beautify and enhance the functionality of web pages. Among them, Layui is a very popular front-end framework that provides rich UI components and easy-to-use function extensions. This article will introduce how to use Layui to achieve image switching and stretching effects, and give specific code examples.

1. Implementation of image switching effect

1. HTML structure

First, we need to prepare some HTML structures for displaying and switching images. Suppose we have three images that can be switched by clicking a button.

<div class="image-container">
  <img  class="current-image lazy"  src="/static/imghw/default1.png"  data-src="image1.jpg"  alt="How to use Layui to achieve image switching and stretching effects" >
  <img  src="/static/imghw/default1.png"  data-src="image2.jpg"  class="lazy" alt="How to use Layui to achieve image switching and stretching effects" >
  <img  src="/static/imghw/default1.png"  data-src="image3.jpg"  class="lazy" alt="How to use Layui to achieve image switching and stretching effects" >
</div>

<button class="btn-prev">上一张</button>
<button class="btn-next">下一张</button>

2. CSS Styles

Next, we need to add some styles to the images and buttons so that they appear centered on the page and have the right size.

.image-container {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 400px;
  width: 600px;
  overflow: hidden;
}

.image-container img {
  width: 100%;
  height: auto;
  transition: transform 0.5s;
}

.btn-prev,
.btn-next {
  margin: 10px;
}

3. JavaScript code

Finally, we use Layui’s event listening mechanism to achieve the image switching effect.

layui.use('jquery', function(){
  var $ = layui.jquery;
  
  // 获取图片列表和按钮
  var images = $('.image-container img');
  var btnPrev = $('.btn-prev');
  var btnNext = $('.btn-next');
  
  // 设置初始下标
  var currentIndex = 0;
  
  // 上一张按钮点击事件
  btnPrev.click(function(){
    currentIndex = (currentIndex - 1 + images.length) % images.length;
    updateImage();
  });
  
  // 下一张按钮点击事件
  btnNext.click(function(){
    currentIndex = (currentIndex + 1) % images.length;
    updateImage();
  });
  
  // 更新图片显示
  function updateImage(){
    images.removeClass('current-image');
    images.eq(currentIndex).addClass('current-image');
  }
});

Through the above code, we have achieved the image switching effect. Clicking the "Previous" button will switch to the previous picture; clicking the "Next" button will switch to the next picture.

2. Implementation of the picture stretching effect

1. HTML structure

Before realizing the picture stretching effect, we need to add some additional HTML structures .

<div class="image-wrap">
  <img  src="/static/imghw/default1.png"  data-src="image.jpg"  class="lazy" alt="How to use Layui to achieve image switching and stretching effects" >
</div>

<button class="btn-stretch">拉伸</button>

2. CSS Style

In order to achieve the image stretching effect, we need to define an outer container to limit the size of the image. At the same time, we also need to add some styles to the button.

.image-wrap {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 400px;
  width: 400px;
  overflow: hidden;
  border: 1px solid #000;
}

.image-wrap img {
  width: 100%;
  height: auto;
  transition: all 0.5s;
}

.btn-stretch {
  margin-top: 10px;
}

3. JavaScript code

Finally, we use Layui’s event listening mechanism to achieve the stretching effect of the image.

layui.use('jquery', function(){
  var $ = layui.jquery;
  
  // 获取图片和按钮
  var imageWrap = $('.image-wrap');
  var image = $('.image-wrap img');
  var btnStretch = $('.btn-stretch');
  
  // 是否拉伸标志
  var isStretched = false;
  
  // 拉伸按钮点击事件
  btnStretch.click(function(){
    if(isStretched){
      image.css('width', '100%');
    } else {
      image.css('width', '200%');
    }
    
    isStretched = !isStretched;
  });
});

Through the above code, we have achieved the image stretching effect. Click the "Stretch" button, and the width of the image will switch from 100% to 200%, and then from 200% back to 100%. Achieved the stretching and shrinking effect of the picture.

Summary:

This article introduces how to use the Layui framework to achieve image switching and stretching effects. Through the above code examples, we can see that the Layui framework provides a wealth of components and extension functions to facilitate developers to quickly build beautiful and practical Web pages. I hope this article can help you learn and use the Layui framework.

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