JavaScript implements four-square grid

In web development, we often need to display pictures or content in columns. One of the commonly used methods is the four-square grid layout. In this article, we will introduce how to use JavaScript to implement a simple four-square grid layout.

What is the Four-Gong Grid?

Four-square grid is a commonly used web page layout method. It divides the entire page into four equal areas, each area contains a picture or a piece of content. The four-square grid layout can separate the page content well and prevent the page from looking too cluttered.

How to realize the four-square grid?

We can use HTML and CSS to implement the four-square grid, but here we will use JavaScript to achieve it. The process of implementing the four-square grid can be divided into two steps: first, generate HTML code and add it to the page; then use CSS to adjust the layout and style of the generated code.

Generate HTML code

We can use JavaScript to dynamically generate HTML code. The specific implementation code is as follows:

// 获取四宫格容器元素
var container = document.getElementById("container");

// 定义图片地址数组和标题数组
var imgSrcs = ["img1.jpg", "img2.jpg", "img3.jpg", "img4.jpg"];
var titles = ["图片1", "图片2", "图片3", "图片4"];

// 循环生成四个图片块
for (var i = 0; i < 4; i++) {
  // 创建图片容器元素
  var imgContainer = document.createElement("div");
  imgContainer.className = "img-container";
  
  // 创建图片元素
  var img = document.createElement("img");
  img.src = imgSrcs[i];
  img.alt = titles[i];
  
  // 创建标题元素
  var title = document.createElement("p");
  title.textContent = titles[i];
  
  // 将图片和标题添加到图片容器中
  imgContainer.appendChild(img);
  imgContainer.appendChild(title);
  
  // 将图片容器添加到四宫格容器中
  container.appendChild(imgContainer);
}

In the above code, we first obtain the four-square grid container element , and then define the image address array and title array. In the loop, we use the createElement method to create the image container element, image element and title element respectively, and add them to the corresponding parent elements.

Using CSS layout and style

Next we need to use CSS to adjust the layout and style of the dynamically generated HTML code. The specific implementation code is as follows:

/* 四宫格容器样式 */
#container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  max-width: 800px;
  margin: 0 auto;
}

/* 图片容器样式 */
.img-container {
  width: 48%;
  margin-bottom: 2%;
  box-shadow: 0px 2px 4px rgba(0, 0, 0, 0.4);
}

/* 图片样式 */
.img-container img {
  display: block;
  width: 100%;
}

/* 标题样式 */
.img-container p {
  font-size: 20px;
  text-align: center;
  margin: 10px 0;
}

In the above code, we have made some layout and style adjustments to the four-square grid container and the picture container to make them meet the requirements of the four-square grid. At the same time, we also made some basic styling settings for images and titles.

The advantages and disadvantages of using JavaScript to implement the four-square grid layout

Compared with using HTML and CSS to directly implement the four-square grid layout, the advantage of using JavaScript to implement it is that it can be implemented more flexibly Advanced Features. For example, we can add or delete picture blocks on the page based on user operations, or implement waterfall flow layout on the page, etc.

However, using JavaScript to implement the four-square grid layout also has some disadvantages. First, it requires additional programming effort and may be difficult for beginners. Secondly, due to the need to dynamically generate HTML code, page loading speed may be slower.

Conclusion

Using JavaScript to implement the four-square grid layout can provide us with more flexibility and scalability, but at the same time, we need to pay attention to its shortcomings and performance impact. For front-end developers, they should choose the implementation method that best suits them based on the specific situation.

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