未加星标

The scroll bar does not scroll when the selected item is out of sight

字体大小 | |
[前端(javascript) 所属分类 前端(javascript) | 发布者 店小二05 | 时间 2018 | 作者 红领巾 ] 0人收藏点击收藏

We have a number of list items in an unordered list of which we can see five at a time. The currently selected list item has its own class ("selected") and when we click up or down, the next list item gets the "selected" class, while the previous one loses it. How do we make it so that when the list item with the "selected" class comes out of the ul's viewable region, the scroll bar will also scroll with the "selected" item?

It scrolls fine with the mouse, but when the up/down buttons are clicked, the selected class changes but it doesn't scroll. In the CSS, the ul is styled with overflow:auto. I've tried changing the overflow but it doesn't have an effect on the result.

EDIT the problem can be seen here: http://jsfiddle.net/E7MSN/63/ click enter on the textbox, and a dropdown list will appear. Then using the keyboard up/down arrows, keep going until you reach out of bounds. Notice the scroll does not follow the "selected" element.

Use scrollTop to move up and down the ul scroll position. So in your case:

$(".services ul").scrollTop($('li').index($(".selected")) * $('.services li').height());

In the above code, the $('li').index($(".selected")) gets the number of the currently selected li element. Then this number is multiplied by the height of each li .

Updated jsFiddle

You may need to clean it up to your liking.

本文前端(javascript)相关术语:javascript是什么意思 javascript下载 javascript权威指南 javascript基础教程 javascript 正则表达式 javascript设计模式 javascript高级程序设计 精通javascript javascript教程

代码区博客精选文章
分页:12
转载请注明
本文标题:The scroll bar does not scroll when the selected item is out of sight
本站链接:https://www.codesec.net/view/611547.html


1.凡CodeSecTeam转载的文章,均出自其它媒体或其他官网介绍,目的在于传递更多的信息,并不代表本站赞同其观点和其真实性负责;
2.转载的文章仅代表原创作者观点,与本站无关。其原创性以及文中陈述文字和内容未经本站证实,本站对该文以及其中全部或者部分内容、文字的真实性、完整性、及时性,不作出任何保证或承若;
3.如本站转载稿涉及版权等问题,请作者及时联系本站,我们会及时处理。
登录后可拥有收藏文章、关注作者等权限...
技术大类 技术大类 | 前端(javascript) | 评论(0) | 阅读(55)