jquery determines whether the scroll bar stops

In web pages, the use of scroll bars is often related to dynamic interaction. However, in some cases we need to know if the scrollbar has stopped scrolling. This article will introduce a method to use jQuery to determine whether the scroll bar has stopped.

First, let’s review how to use jQuery to detect scroll events. In jQuery, you can use the following code to bind scroll events:

$(window).scroll(function(){
  //scroll event code here
});

In this example, we use $(window) to select the entire web page, and then use . scroll() method to bind scroll events. When the user scrolls the page, this event is triggered and the corresponding code is executed.

When detecting whether the scroll bar stops, we need some additional code. Specifically, we need to use the setTimeout() method and variables to record the position of the scroll bar, and then compare it with the new position to determine whether the scroll bar has stopped. The following is a sample code:

//声明变量
var position = $(window).scrollTop();
var timeout = null;

$(window).scroll(function() {
  //清除定时器
  clearTimeout(timeout);
  //设置定时器
  timeout = setTimeout(function() {
    //判断是否停止滚动
    if ($(window).scrollTop() == position) {
      console.log("滚动条已停止");
      //停止滚动后执行的代码
    }
    //更新位置
    position = $(window).scrollTop();
  }, 50);
});

In this code, we create two variables: position is used to record the current scroll bar position, timeout is used to Stores the timer we are going to set. When the user scrolls the page, we first clear the previously set timer, and then use the setTimeout() method to set a new timer. This timer is executed after 50 milliseconds. If the position of the scroll bar is different from before, we update the value of position. If the scroll bar is in the same position as before, we output a message indicating that the scroll bar has stopped.

It should be noted that we need to calculate in the timer to ensure that the user has stopped scrolling. In this example, we used an interval of 50 milliseconds. This number can be adjusted on a case-by-case basis to ensure accuracy and performance.

So far, we have successfully used jQuery to determine whether the scroll bar has stopped. In practical applications, we can add further code as needed to achieve more complex functions.

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