以相反的顺序单击时，通过javascript添加到嵌套列表的“ onclick”属性不起作用
[英]“onclick” attribute added to nested lists through javascript doesn't work when clicked in reverse order
问题描述
我正在尝试从头开始构建显示/隐藏列表。 当我从上至下单击该列表时，该列表有效，但当我从上至下单击该列表时，则炸弹。 如果有人能指出我做错了什么，我将不胜感激，谢谢！
编辑：对不起，我只是注意到第一个单词实际上是可点击的。 “第二”和“第三”扩展列表，但“元素”不扩展。
var clickableLists = document.querySelectorAll("p:only-of-type"); for (var i = 0; i < clickableLists.length; i += 1) { clickableLists[i].setAttribute("onclick", "showMore(this.nextElementSibling)"); } function showMore(selectedElement) { selectedElement.style.opacity = "1"; selectedElement.style.height = "auto"; }
ul { opacity: 0; height: 0; } li { list-style: none; }
<!DOCTYPE html> <html> <head> <title>List Viewer</title> </head> <body> <div> <div> <p>First Element</p> <ul> <li> <p>One</p> <ul> <li>+ Test</li> </ul> </li> <li> <p>Two</p> <ul> <li>+ Test</li> </ul> </li> </ul> </div> <div> <p>Second Element</p> <ul> <li> <p>One</p> <ul> <li>+ Test</li> </ul> </li> <li> <p>Two</p> <ul> <li>+ Test</li> </ul> </li> </ul> </div> <div> <p>Third Element</p> <ul> <li> <p>One</p> <ul> <li>+ Test</li> </ul> </li> <li> <p>Two</p> <ul> <li>+ Test</li> </ul> </li> </ul> </div> </div> </body> </html>
2 个解决方案
解决方案1
0 2017-04-25 01:47:06
使用“可见性：隐藏；” 而不是“不透明度：0;”
<!DOCTYPE html> <html> <head> <title>List Viewer</title> <style type="text/css"> ul { visibility: hidden; height: 0; } li { list-style: none; } </style> </head> <body> <div> <div> <p>First Element</p> <ul> <li> <p>One</p> <ul> <li>+ Test</li> </ul> </li> <li> <p>Two</p> <ul> <li>+ Test</li> </ul> </li> </ul> </div> <div> <p>Second Element</p> <ul> <li> <p>One</p> <ul> <li>+ Test</li> </ul> </li> <li> <p>Two</p> <ul> <li>+ Test</li> </ul> </li> </ul> </div> <div> <p>Third Element</p> <ul> <li> <p>One</p> <ul> <li>+ Test</li> </ul> </li> <li> <p>Two</p> <ul> <li>+ Test</li> </ul> </li> </ul> </div> </div> <script type="text/javascript"> var clickableLists = document.querySelectorAll("p:only-of-type"); for (var i = 0; i < clickableLists.length; i += 1){ clickableLists[i].setAttribute("onclick", "showMore(this.nextElementSibling)"); } function showMore(selectedElement) { selectedElement.style.visibility = "visible"; selectedElement.style.height = "auto"; } </script> </body> </html>
解决方案2
0 已采纳 2017-04-25 01:47:13
您的不可见元素溢出了其容器， height: 0并且位于以下元素的顶部，从而拦截了它们的点击。 不更改不透明度，更容易发现问题：
var clickableLists = document.querySelectorAll("p:only-of-type"); for (var i = 0; i < clickableLists.length; i += 1){ clickableLists[i].setAttribute("onclick", "showMore(this.nextElementSibling)"); } function showMore(selectedElement) { selectedElement.style.opacity = "1"; selectedElement.style.height = "auto"; }
ul { height: 0; } li { list-style: none; }
<div> <div> <p>First Element</p> <ul> <li> <p>One</p> <ul> <li>+ Test</li> </ul> </li> <li> <p>Two</p> <ul> <li>+ Test</li> </ul> </li> </ul> </div> <div> <p>Second Element</p> <ul> <li> <p>One</p> <ul> <li>+ Test</li> </ul> </li> <li> <p>Two</p> <ul> <li>+ Test</li> </ul> </li> </ul> </div> <div> <p>Third Element</p> <ul> <li> <p>One</p> <ul> <li>+ Test</li> </ul> </li> <li> <p>Two</p> <ul> <li>+ Test</li> </ul> </li> </ul> </div> </div>
您可以添加overflow: hidden以确保没有溢出height: 0的<ul> ，但是设置display: none甚至更容易，这将从流中完全删除一个元素。
最好不要将JavaScript表示为JavaScript内部的字符串。 您可以将函数直接分配给元素的onclick属性：
clickableLists[i].onclick = function () {
showMore(this.nextElementSibling);
};
var clickableLists = document.querySelectorAll("p:only-of-type"); for (var i = 0; i < clickableLists.length; i += 1){ clickableLists[i].onclick = function () { showMore(this.nextElementSibling); }; } function showMore(selectedElement) { selectedElement.style.display = 'block'; }
ul { display: none; } li { list-style: none; }
<div> <div> <p>First Element</p> <ul> <li> <p>One</p> <ul> <li>+ Test</li> </ul> </li> <li> <p>Two</p> <ul> <li>+ Test</li> </ul> </li> </ul> </div> <div> <p>Second Element</p> <ul> <li> <p>One</p> <ul> <li>+ Test</li> </ul> </li> <li> <p>Two</p> <ul> <li>+ Test</li> </ul> </li> </ul> </div> <div> <p>Third Element</p> <ul> <li> <p>One</p> <ul> <li>+ Test</li> </ul> </li> <li> <p>Two</p> <ul> <li>+ Test</li> </ul> </li> </ul> </div> </div>
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