How to write thinkphp magnifying glass

ThinkPHP is a very popular PHP framework that has always been loved by developers. Under this framework, it is also very simple to implement the picture magnifier function. Below we will explain step by step how to achieve the picture magnifying glass effect in ThinkPHP.

1. Introducing the magnifying glass code

To use the magnifying glass effect on a web page, you need to use JavaScript code to achieve it. We can download a copy of the magnifying glass code from the Internet, or we can write it ourselves. Here we assume that we already have a file named magnifier.js and place it in the public/js directory.

2. Prepare picture resources

Upload the pictures that need to be applied with the magnifying glass effect to the public/images directory, and prepare the enlarged pictures.

3. Write HTML template file

In the page where the magnifying glass effect needs to be applied, create a div container and set its style to the style required for the magnifying glass effect. Next, insert the img tag into the container, specify the path of the image to which the magnifying glass effect needs to be applied, and set the style of the image so that its width, height, and style class name are consistent with the container. At the same time, set a custom attribute data-magnify-src to the img tag to specify the path of the enlarged image. This path is the image resource we prepared in advance.

Let’s take a look at the template code:

<!-- 引入放大镜代码 -->
<script type="text/javascript" src="/public/js/magnifier.js"></script>

<!-- 创建容器并插入图片 -->
<div class="magnify-container">
    <img class="magnify-image" src="/public/images/product.jpg" data-magnify-src="/public/images/product-large.jpg">
</div>

4. Write JavaScript code

In JavaScript, we first need to introduce the magnifying glass code magnifier.js we just downloaded. Next, you need to call the magnify() method in the code and pass the image and container to which the magnifying glass effect is applied to the method. Finally, we can also set some parameters, such as the image magnification factor, the size of the magnified area after the mouse is moved, etc.

Let’s take a look at JavaScript code examples:

<script type="text/javascript">
    // 引入放大镜代码
    $.getScript("/public/js/magnifier.js", function(){
        // 获取图片元素和容器元素
        var magnifyImg = $('.magnify-image');
        var magnifyContainer = $('.magnify-container');

        // 应用放大镜效果
        magnifyImg.magnify({
            // 设置放大倍数
            ratio: 3,
            // 设置放大区域的大小
            width: 300,
            height: 300,
            // 设置当鼠标移出容器时是否隐藏放大镜区域
            srcollable: false,
            // 设置跟随鼠标移动的半径范围
            radius: 100,
            // 设置是否显示放大区域的边框
            border: false,
            // 设置放大区域的形状
            shape: 'circle'
        });
    });
</script>

5. Style settings

Finally, we also need to set styles for containers and images so that they are centered and in line with Containers are of consistent size.

The following is a CSS code example:

<style type="text/css">
    /* 容器样式 */
    .magnify-container {
        width: 300px;
        height: 300px;
        margin: 0 auto;
        position: relative;
    }

    /* 图片样式 */
    .magnify-image {
        width: 100%;
        height: 100%;
    }
</style>

So far, through the above steps, we have successfully implemented the function of applying the magnifying glass effect in ThinkPHP.

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