How to use HTML, CSS and jQuery to implement advanced functions of image merging and display

How to use HTML, CSS and jQuery to realize the advanced function of image merging and display

Overview:
In web design, image display is an important link. Image merge display is one of the common techniques to improve page loading speed and enhance user experience. This article will introduce how to use HTML, CSS and jQuery to implement advanced functions of image merging and display, and provide specific code examples.

1. HTML layout:
First, we need to create a container in HTML to display the merged images. You can use the div element as a container and create an img element in the container to display the image.

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

2. CSS style:
Next, we need to set the style of the image container to ensure that the images can be displayed correctly after merging. You can use the position property of CSS to control the position of the image, and the overflow property to control the display mode of the image.

#image-container {
    position: relative;
    width: 500px;
    height: 500px;
    overflow: hidden;
}

3. jQuery script:
Then, we use jQuery script to implement the image merging function. First, you need to get the width and height of the merged image.

var mergedImageWidth = 2000; // 合并后的图片宽度
var mergedImageHeight = 2000; // 合并后的图片高度

Next, we need to listen to the mouse movement event of the image container and calculate the display position of the merged image based on the position of the mouse. You can use jQuery's mousemove event to monitor mouse movement and determine the offset of the merged image by calculating the relative position of the mouse in the image container.

$("#image-container").mousemove(function(event) {
    var containerOffset = $(this).offset(); // 获取容器相对于文档的偏移量
    var mouseX = event.pageX - containerOffset.left; // 获取鼠标在容器中的水平位置
    var mouseY = event.pageY - containerOffset.top; // 获取鼠标在容器中的垂直位置
    var mergedImageLeft = ((mergedImageWidth - $(this).width()) * mouseX) / $(this).width(); // 计算合并图片的水平偏移量
    var mergedImageTop = ((mergedImageHeight - $(this).height()) * mouseY) / $(this).height(); // 计算合并图片的垂直偏移量
    
    $("#merged-image").css({
        left: -mergedImageLeft,
        top: -mergedImageTop
    }); // 设置合并图片的偏移量
    
});

Finally, we need to reset the merged image to its initial position when the mouse moves out of the container. You can use jQuery's mouseleave event to listen for the mouse to move out of the container and reset the offset of the merged image.

$("#image-container").mouseleave(function() {
    $("#merged-image").css({ left: 0, top: 0 });
});

4. Summary:
Through the above code examples, we can use HTML, CSS and jQuery to implement advanced functions of image merging and display. By listening to mouse movement events, you can calculate the display position of the merged image based on the position of the mouse, and display the image content in the specified area by setting the offset of the merged image. This technique can effectively improve page loading speed and user experience, and is especially suitable for displaying large-size images.

Note: The above code examples are for demonstration purposes only and may need to be modified and optimized according to specific needs in actual projects.

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