Modify scroll bar width jquery

In web design, scroll bars are a very important component, which allow users to easily browse long pages or areas. However, due to differences in different browsers and operating systems, the appearance of scroll bars is also different. In this case, we may need to modify the style and width of the scroll bar to meet the design requirements, and this can be easily achieved using jQuery.

1. Modify the scroll bar style

First, we need to define a style to override the browser's default scroll bar style. You can refer to the following code:

/* 外部容器 */
.scroll-container {
  width: 300px;
  height: 200px;
  overflow: auto; /* 必须设置为auto或scroll才会产生滚动条 */
  background-color: #f2f2f2;
}

/* 滚动条整体 */
.scroll-bar {
  width: 8px;
  background-color: #aaa;
  border-radius: 4px;
}

/* 滚动条滑块 */
.scroll-thumb {
  width: 100%;
  background-color: #666;
  border-radius: 4px;
}

/* 滚动条箭头 */
.scroll-arrow {
  width: 8px;
  height: 8px;
  background-color: #aaa;
}

/* 鼠标悬停样式 */
.scroll-thumb:hover {
  background-color: #333;
}

/* 滚动条被选中时的样式 */
.scroll-thumb:active {
  background-color: #000;
}

/* 禁用滚动条样式 */
.scroll-container[disabled]::-webkit-scrollbar {
  width: 0;
  background-color: #f2f2f2;
}

In the above code , we define an external container .scroll-container and set its width, height and scroll bar style. The overall style of the scroll bar .scroll-bar and the slider style .scroll-thumb respectively set the width, background color, rounded corners and other styles, while the arrow style .scroll -arrow only sets the width, height and background color. Finally, we define styles for hover and selection, as well as styles for when the scrollbar is disabled. It should be noted that disabling scroll bar styles requires the use of CSS pseudo-element ::-webkit-scrollbar.

2. Use jQuery to modify the scroll bar width

In the above style definition, we set the overall width of the scroll bar to 8px. If you need to dynamically modify the scroll bar width, you can use the following jQuery code:

$('#container').css('scrollbar-width', '16px');

In the above code, we use the .css() method to modify the container #container The width of the scroll bar, set the width to 16px. What needs special reminder here is that scrollbar-width is a new CSS property, currently only supported by the Chrome browser. For other browsers, you can use the following code to achieve it:

if(navigator.userAgent.indexOf('Chrome') != -1) {
  $('#container').css('scrollbar-width', '16px');
} else {
  $('#container').css('width', $('#container').width() - 8 + 16);
  $('.scroll-thumb').css('width', 'calc(100% - 16px)');
}

In the above code, we first determine whether the current browser is Chrome through the navigator.userAgent method, and if so, directly modify the scrolling Bar width; if not, you need to subtract the default scroll bar width of 8px from the container width width, and add the new width of 16px. Then, we modify the slider width to calc(100% - 16px) through the .css() method.

3. Summary

The above content introduces how to modify the scroll bar style and width through CSS and jQuery. It should be noted that the CSS property scrollbar-width is only applicable to the Chrome browser, while other browsers need to use other methods to implement it. In actual development, we should choose the appropriate solution according to the specific situation and perform appropriate compatibility processing to ensure that the scroll bar can be displayed and used normally under different browsers and operating systems.

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