Use Webman to implement responsive image display on the website

Use Webman to implement responsive image display on the website

With the development of the mobile Internet, more and more users access websites through mobile devices. On mobile devices, due to differences in screen size and resolution, traditional fixed-size images may not be displayed perfectly, resulting in a degraded user experience. In order to improve user experience, we can use Webman (a set of tools for processing images provided by WebP Lab) to implement responsive image display on the website.

Webman is a post-processing tool based on WebP. It can generate responsive images that meet different visual needs based on device screenshots, thereby improving the display effect of the website on different devices. Next, we will use a code example to introduce how to use Webman to implement responsive image display.

First of all, we need to introduce Webman related resources into the web page. Webman scripts and style sheets can be introduced into the web page through the following code:

<link rel="stylesheet" href="webman.css">
<script src="webman.js"></script>

Next, we need to define a container in the web page to display the image. You can use the following code to define an image container with the id "responsive-image":

<div id="responsive-image">
  <img src="/static/imghw/default1.png"  data-src="image.jpg"  class="lazy" alt="Responsive Image">
</div>

In the CSS style sheet, we can set a width for the image container relative to the viewport size, and set The width of the image is set to 100%. This ensures that the image maintains proper proportions across different screen sizes. The following code can be used to set the style:

#responsive-image {
  width: 100%;
}

#responsive-image img {
  width: 100%;
  height: auto;
}

Then, we need to use Webman in the JavaScript code to process the image. You can use the following code to generate responsive images using Webman:

var responsiveImage = document.getElementById('responsive-image');
var sourceImage = responsiveImage.getElementsByTagName('img')[0];

webman.process(sourceImage, function(result) {
  responsiveImage.innerHTML = ''; // 清空容器内容
  responsiveImage.appendChild(result); // 将处理后的图片添加到容器中
});

In the above code, we first obtain the image container and source image object. Then, call Webman's process method to process the source image. After processing is complete, we clear the contents of the container and add the processed image to the container.

Finally, we only need to save the relevant configuration of Webman for processing images in the webman.js file. You can use the following code to define Webman's configuration file:

webman.config = {
  responsive: true,
  quality: 80,
  sizes: [
    {width: 320},
    {width: 480},
    {width: 640},
    {width: 800}
  ]
};

In the above code, we can configure Webman parameters according to actual needs. The responsive parameter indicates whether to enable the responsive function, the quality parameter indicates the processed image quality, and the sizes parameter indicates the image size generated under different screen sizes.

Through the above steps, we can use Webman to implement responsive image display on the website. When a user visits a website, Webman will generate a picture suitable for the current device based on the device's screenshot and display it on the web page, thereby improving the user experience.

To sum up, using Webman to implement responsive image display on the website is a very good way to display appropriate image sizes according to different user devices, thereby providing a better user experience. I hope the above code examples can help you use Webman to implement responsive image display in website development.

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