How to bind events when shrinking the screen in jquery

With the popularity of mobile devices, more and more people choose to use mobile phones, tablets and other mobile devices to browse the web. Therefore, responsive design has become an essential skill for modern website design. In responsive design, the resize event is one of the most important events and can be used to detect changes in the size of the browser window to achieve adaptive layout of the page. jQuery is one of the most widely used JavaScript libraries currently, and I believe everyone is very familiar with it. So, this article will introduce how to use jQuery to bind events when the screen is reduced.

1. Basic concept of resize event

In the browser, the resize event is an event triggered when the size of the window changes. It is the core event of responsive design.

1.1. Syntax of resize event

The basic syntax of resize event is as follows:

$(window).resize(function(){
  // 在此处编写窗口大小改变后的操作
});

In the above code, $(window) means to resize the window Listening, resize() means registering a callback function for the resize event, which will be triggered and executed when the browser window size changes.

1.2. Application of resize event

Through the resize event, we can achieve different layout effects according to different window sizes, such as hiding certain elements when the window size becomes smaller than a certain value. , or add new styles to the page when the window becomes very small, etc.

2. jQuery implements binding events when shrinking the screen

In responsive design, we usually need to automatically process the page layout when the browser window size changes, which requires the use of jQuery resize event.

2.1. Detect whether the window has been reduced

First, we need to detect whether the current window has been reduced. A simpler method is to save the width of the current window in a variable and determine whether the current window width is smaller than the previously saved window width in the resize event. The code is as follows:

// 保存当前窗口宽度
var windowWidth = $(window).width();

// 监听resize事件
$(window).resize(function() {
  // 判断当前窗口宽度是否小于之前保存的窗口宽度
  if($(window).width() < windowWidth){
    // 缩小时执行的代码
  } else{
    // 放大时执行的代码
  }
});

In the above code, we execute some codes when the window is reduced and other codes when it is enlarged. The specific code to be executed can be determined based on actual needs.

2.2. Binding events

When shrinking the screen, we may need to perform some specific actions. For example, we may need to hide some elements, change the font size of some text, etc. This requires binding the corresponding event in the resize event. For example, the following code changes the font size of the element with ID #title to 12 pixels when the window is reduced:

$(window).resize(function() {
  // 获取当前窗口宽度
  var width = $(window).width();
  // 判断当前窗口宽度是否小于某一值
  if (width < 768) {
    // 窗口小于768时字号改为12px
    $("#title").css("font-size", "12px");
  } else {
    // 窗口大于等于768时字号改为16px
    $("#title").css("font-size", "16px");
  }
});

When the window is reduced, this code will change the element ID to 12 pixels. The font size of #title is changed to 12 pixels; when the window is expanded, the font size of this element will return to 16 pixels.

3. Summary

This article introduces how to use jQuery to bind events when the screen is reduced. In responsive design, using the resize event can control the layout of page elements very effectively.

When applying the resize event, we need to first determine whether the window is reduced, and then perform some actions. For example, adaptive layout can be achieved by changing the font size of elements, hiding certain elements, etc. Hope this article is helpful to everyone!

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