jquery sets scroll bar specification

In a web page, the scroll bar is a very important component, which allows users to freely scroll the page in the browser window to view more content. In some applications, we need to program the position of the scroll bar so that the user can accurately locate the specified content. This article will introduce how to use jQuery to set the position of the scroll bar.

1. Introduction

jQuery is a very popular JavaScript library. It simplifies the JavaScript development process and provides a more convenient API to operate DOM, events, animations, etc. wait. It is also very convenient to use jQuery to set the position of the scroll bar.

2. Set the scroll bar position

2.1 Get the scroll bar position

First, we need to get the current scroll bar position. In jQuery, you can use the scrollTop method to get the distance from the top of the document relative to the top of the window. For example:

$(window).scrollTop();

This line of code will return the distance from the top of the current window relative to the top of the document.

2.2 Set the scroll bar position

With the current scroll bar position, you can set the scroll bar position. Still using the scrollTop method, but this time the parameter passed in is the scroll bar position that needs to be set. For example:

$(window).scrollTop(500);

This line of code will set the position of the scroll bar to 500 pixels from the top of the document. Note that the parameters here are in pixels.

3. Dynamicly set the scroll bar position

With the method of obtaining and setting the scroll bar position, the following can introduce how to dynamically set the scroll bar position during user operation. Suppose we have a page with some chapters. Each chapter has an anchor link. Clicking the link can jump to the specified chapter. After the jump, we hope that the page will automatically scroll to the specified chapter so that the user can directly see the relevant content.

First, you need to bind a click event to each anchor link. When the user clicks the link, get the position of the target element, and then set the scroll bar position. For example:

$('a').on('click', function() {
  var targetOffset = $($(this).attr('href')).offset().top;
  $(window).scrollTop(targetOffset);
});

This code will bind click events to all anchor links in the page. When the user clicks on the link, the link's href attribute (the value of the anchor point) will be obtained, and then used as a selector to obtain the target element, and use the offset method to obtain the relative position of the target element. The position at the top of the document, and finally use the scrollTop method to set the scroll bar position.

4. Summary

This article introduces how to use jQuery to set the position of the scroll bar. First, you need to use the scrollTop method to get the current scroll bar position; then, you can use the same method to set the scroll bar position. Finally, we introduced how to dynamically set the scroll bar position when the user clicks the anchor link so that the user can directly see the target content. Hope this article can be helpful to you.

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