java培训小效果-文字的折叠和展开效果

们时常会遇到这样的问题，文字太长致使页面被拉的太长，加载起来很困难，而且用户没有耐心来看这么长篇幅的内容，看到就烦躁而调走，这时候我们就需要一个可以把文字隐藏一部分的功能，然后通过一个点击来展开或者引导登录或者关注后在展开。

如此我们可以得到注册量和关注量，从而达到我们想要的效果！具体作用就不再这里做详细分析了，相信大家已经知道他们的用途了！下面来看下效果吧！

收起后效果：

收起效果

点击“查看全文”后的效果

展开效果

源码也共享给大家，可以自行复制，这次没有单独的js，可以直接复制使用哦

<html>

<head>

<title>文字的折叠和展开效果</title>

</head>

<body>

<div>

<tr>

<span style="font-size: 9pt"> <b>文字的折叠和展开效果：</b>我是折叠后的内容，点击展开后我会消失，只要把展开的开头内容设置和我一样了就可以了...[<a href="javascript：" onclick="document.all.fullContent.style.display=(document.all.fullContent.style.display=='none')?'':'none';document.all.smallContent.style.display=(document.all.smallContent.style.display=='none')?'':'none'" >查看全文</a>]</span></div>

<b>文字的折叠和展开效果：</b>我是展开后的内容，收起后我会消失，我是展开后的内容，收起后我会消失，我是展开后的内容，收起后我会消失，我是展开后的内容，收起后我会消失，我是展开后的内容，收起后我会消失，我是展开后的内容，收起后我会消失，我是展开后的内容，收起后我会消失，我是展开后的内容，收起后我会消失，我是展开后的内容，收起后我会消失，我是展开后的内容，收起后我会消失，我是展开后的内容，收起后我会消失，我是展开后的内容，收起后我会消失，我是展开后的内容，收起后我会消失，我是展开后的内容，收起后我会消失，我是展开后的内容，收起后我会消失，我是展开后的内容，收起后我会消失，我是展开后的内容，收起后我会消失，我是展开后的内容，收起后我会消失，我是展开后的内容，收起后我会消失，我是展开后的内容，收起后我会消失，我是展开后的内容，收起后我会消失，我是展开后的内容，收起后我会消失，我是展开后的内容，收起后我会消失，

[<a href="javascript：" onclick="document.all.fullContent.style.display=(document.all.fullContent.style.display=='none')?'':'none';document.all.smallContent.style.display=(document.all.smallContent.style.display=='none')?'':'none'" >收起</a>]</span></div></td>

</tr>

</table>

</div>

</body>

</html>

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一个有限的空间内显示用于呈现信息的可折叠的内容面板。

如需了解更多有关 accordion 部件的细节，请查看 API 文档折叠面板部件（Accordion Widget）。

默认功能

点击头部展开/折叠被分为各个逻辑部分的内容，就像标签页（tabs）一样。您可以选择性地设置当鼠标悬停时是否切换各部分的打开/关闭状态。

基本的 HTML 标记是一系列的标题（H3 标签）和内容 div，因此内容不用通过 JavaScript 即可用。

<!doctype html> <html> <head> <meta charset="utf-8"> <title>jQuery UI 折叠面板（Accordion） - 默认功能</title> <link rel="stylesheet" href="//code.jquery.com/ui/1.10.4/themes/smoothness/jquery-ui.css"> <script src="//code.jquery.com/jquery-1.9.1.js"></script> <script src="//code.jquery.com/ui/1.10.4/jquery-ui.js"></script> <link rel="stylesheet" href="http://jqueryui.com/resources/demos/style.css"> <script> $(function() { $( "#accordion" ).accordion(); }); </script> </head> <body> <div id="accordion"> <h3>部分 1</h3> <div> <p> Mauris mauris ante, blandit et, ultrices a, suscipit eget, quam. Integer ut neque. Vivamus nisi metus, molestie vel, gravida in, condimentum sit amet, nunc. Nam a nibh. Donec suscipit eros. Nam mi. Proin viverra leo ut odio. Curabitur malesuada. Vestibulum a velit eu ante scelerisque vulputate. </p> </div> <h3>部分 2</h3> <div> <p> Sed non urna. Donec et ante. Phasellus eu ligula. Vestibulum sit amet purus. Vivamus hendrerit, dolor at aliquet laoreet, mauris turpis porttitor velit, faucibus interdum tellus libero ac justo. Vivamus non quam. In suscipit faucibus urna. </p> </div> <h3>部分 3</h3> <div> <p> Nam enim risus, molestie et, porta ac, aliquam ac, risus. Quisque lobortis. Phasellus pellentesque purus in massa. Aenean in pede. Phasellus ac libero ac tellus pellentesque semper. Sed ac felis. Sed commodo, magna quis lacinia ornare, quam ante aliquam nisi, eu iaculis leo purus venenatis dui. </p> <ul> <li>List item one</li> <li>List item two</li> <li>List item three</li> </ul> </div> <h3>部分 4</h3> <div> <p> Cras dictum. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Aenean lacinia mauris vel est. </p> <p> Suspendisse eu nisl. Nullam ut libero. Integer dignissim consequat lectus. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. </p> </div> </div> </body> </html>

折叠内容

默认情况下，折叠面板总是保持一个部分是打开的。为了让所有部分都是折叠的，可设置 collapsible 选项为 true。点击当前打开的部分，来折叠它的内容面板。

<!doctype html> <html> <head> <meta charset="utf-8"> <title>jQuery UI 折叠面板（Accordion） - 折叠内容</title> <link rel="stylesheet" href="//code.jquery.com/ui/1.10.4/themes/smoothness/jquery-ui.css"> <script src="//code.jquery.com/jquery-1.9.1.js"></script> <script src="//code.jquery.com/ui/1.10.4/jquery-ui.js"></script> <link rel="stylesheet" href="http://jqueryui.com/resources/demos/style.css"> <script> $(function() { $( "#accordion" ).accordion({ collapsible: true }); }); </script> </head> <body> <div id="accordion"> <h3>部分 1</h3> <div> <p>Mauris mauris ante, blandit et, ultrices a, suscipit eget, quam. Integer ut neque. Vivamus nisi metus, molestie vel, gravida in, condimentum sit amet, nunc. Nam a nibh. Donec suscipit eros. Nam mi. Proin viverra leo ut odio. Curabitur malesuada. Vestibulum a velit eu ante scelerisque vulputate.</p> </div> <h3>部分 2</h3> <div> <p>Sed non urna. Donec et ante. Phasellus eu ligula. Vestibulum sit amet purus. Vivamus hendrerit, dolor at aliquet laoreet, mauris turpis porttitor velit, faucibus interdum tellus libero ac justo. Vivamus non quam. In suscipit faucibus urna. </p> </div> <h3>部分 3</h3> <div> <p>Nam enim risus, molestie et, porta ac, aliquam ac, risus. Quisque lobortis. Phasellus pellentesque purus in massa. Aenean in pede. Phasellus ac libero ac tellus pellentesque semper. Sed ac felis. Sed commodo, magna quis lacinia ornare, quam ante aliquam nisi, eu iaculis leo purus venenatis dui. </p> <ul> <li>List item one</li> <li>List item two</li> <li>List item three</li> </ul> </div> <h3>部分 4</h3> <div> <p>Cras dictum. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Aenean lacinia mauris vel est. </p><p>Suspendisse eu nisl. Nullam ut libero. Integer dignissim consequat lectus. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. </p> </div> </div> </body> </html>

查看演示

自定义图标

通过 icons 选项自定义标题图标，icons 选项接受标题默认的和激活的（打开的）状态的 class。使用 UI CSS 框架中的任意 class，或者使用背景图像创建自定义的 class。

<!doctype html> <html> <head> <meta charset="utf-8"> <title>jQuery UI 折叠面板（Accordion） - 自定义图标</title> <link rel="stylesheet" href="//code.jquery.com/ui/1.10.4/themes/smoothness/jquery-ui.css"> <script src="//code.jquery.com/jquery-1.9.1.js"></script> <script src="//code.jquery.com/ui/1.10.4/jquery-ui.js"></script> <link rel="stylesheet" href="http://jqueryui.com/resources/demos/style.css"> <script> $(function() { var icons={ header: "ui-icon-circle-arrow-e", activeHeader: "ui-icon-circle-arrow-s" }; $( "#accordion" ).accordion({ icons: icons }); $( "#toggle" ).button().click(function() { if ( $( "#accordion" ).accordion( "option", "icons" ) ) { $( "#accordion" ).accordion( "option", "icons", null ); } else { $( "#accordion" ).accordion( "option", "icons", icons ); } }); }); </script> </head> <body> <div id="accordion"> <h3>部分 1</h3> <div> <p>Mauris mauris ante, blandit et, ultrices a, suscipit eget, quam. Integer ut neque. Vivamus nisi metus, molestie vel, gravida in, condimentum sit amet, nunc. Nam a nibh. Donec suscipit eros. Nam mi. Proin viverra leo ut odio. Curabitur malesuada. Vestibulum a velit eu ante scelerisque vulputate.</p> </div> <h3>部分 2</h3> <div> <p>Sed non urna. Donec et ante. Phasellus eu ligula. Vestibulum sit amet purus. Vivamus hendrerit, dolor at aliquet laoreet, mauris turpis porttitor velit, faucibus interdum tellus libero ac justo. Vivamus non quam. In suscipit faucibus urna. </p> </div> <h3>部分 3</h3> <div> <p>Nam enim risus, molestie et, porta ac, aliquam ac, risus. Quisque lobortis. Phasellus pellentesque purus in massa. Aenean in pede. Phasellus ac libero ac tellus pellentesque semper. Sed ac felis. Sed commodo, magna quis lacinia ornare, quam ante aliquam nisi, eu iaculis leo purus venenatis dui. </p> <ul> <li>List item one</li> <li>List item two</li> <li>List item three</li> </ul> </div> <h3>部分 4</h3> <div> <p>Cras dictum. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Aenean lacinia mauris vel est. </p><p>Suspendisse eu nisl. Nullam ut libero. Integer dignissim consequat lectus. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. </p> </div> </div> <button id="toggle">切换图标</button> </body> </html>

查看演示

填充空间

由于折叠面板是由块级元素组成的，默认情况下它的宽度会填充可用的水平空间。为了填充由容器分配的垂直空间，设置 heightStyle 选项为 "fill"，脚本会自动设置折叠面板的尺寸为父容器的高度。

<!doctype html> <html> <head> <meta charset="utf-8"> <title>jQuery UI 折叠面板（Accordion） - 填充空间</title> <link rel="stylesheet" href="//code.jquery.com/ui/1.10.4/themes/smoothness/jquery-ui.css"> <script src="//code.jquery.com/jquery-1.9.1.js"></script> <script src="//code.jquery.com/ui/1.10.4/jquery-ui.js"></script> <link rel="stylesheet" href="http://jqueryui.com/resources/demos/style.css"> <style> #accordion-resizer { padding: 10px; width: 350px; height: 220px; } </style> <script> $(function() { $( "#accordion" ).accordion({ heightStyle: "fill" }); }); $(function() { $( "#accordion-resizer" ).resizable({ minHeight: 140, minWidth: 200, resize: function() { $( "#accordion" ).accordion( "refresh" ); } }); }); </script> </head> <body> <h3>重新调整外部容器：</h3> <div id="accordion-resizer"> <div id="accordion"> <h3>部分 1</h3> <div> <p>Mauris mauris ante, blandit et, ultrices a, suscipit eget, quam. Integer ut neque. Vivamus nisi metus, molestie vel, gravida in, condimentum sit amet, nunc. Nam a nibh. Donec suscipit eros. Nam mi. Proin viverra leo ut odio. Curabitur malesuada. Vestibulum a velit eu ante scelerisque vulputate.</p> </div> <h3>部分 2</h3> <div> <p>Sed non urna. Donec et ante. Phasellus eu ligula. Vestibulum sit amet purus. Vivamus hendrerit, dolor at aliquet laoreet, mauris turpis porttitor velit, faucibus interdum tellus libero ac justo. Vivamus non quam. In suscipit faucibus urna. </p> </div> <h3>部分 3</h3> <div> <p>Nam enim risus, molestie et, porta ac, aliquam ac, risus. Quisque lobortis. Phasellus pellentesque purus in massa. Aenean in pede. Phasellus ac libero ac tellus pellentesque semper. Sed ac felis. Sed commodo, magna quis lacinia ornare, quam ante aliquam nisi, eu iaculis leo purus venenatis dui. </p> <ul> <li>List item one</li> <li>List item two</li> <li>List item three</li> </ul> </div> <h3>部分 4</h3> <div> <p>Cras dictum. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Aenean lacinia mauris vel est. </p><p>Suspendisse eu nisl. Nullam ut libero. Integer dignissim consequat lectus. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. </p> </div> </div> </div> </body> </html>

非自动高度

设置 heightStyle: "content"，让折叠面板保持它们初始的高度。

<!doctype html> <html> <head> <meta charset="utf-8"> <title>jQuery UI 折叠面板（Accordion） - 非自动高度</title> <link rel="stylesheet" href="//code.jquery.com/ui/1.10.4/themes/smoothness/jquery-ui.css"> <script src="//code.jquery.com/jquery-1.9.1.js"></script> <script src="//code.jquery.com/ui/1.10.4/jquery-ui.js"></script> <link rel="stylesheet" href="http://jqueryui.com/resources/demos/style.css"> <script> $(function() { $( "#accordion" ).accordion({ heightStyle: "content" }); }); </script> </head> <body> <div id="accordion"> <h3>部分 1</h3> <div> <p>Mauris mauris ante, blandit et, ultrices a, susceros. Nam mi. Proin viverra leo ut odio. Curabitur malesuada. Vestibulum a velit eu ante scelerisque vulputate.</p> </div> <h3>部分 2</h3> <div> <p>Sed non urna. Donec et ante. Phasellus eu ligula. Vestibulum sit amet purus. Vivamus hendrerit, dolor at aliquet laoreet, mauris turpis porttitor velit, faucibus interdum tellus libero ac justo. Vivamus non quam. In suscipit faucibus urna. </p> </div> <h3>部分 3</h3> <div> <p>Nam enim risus, molestie et, porta ac, aliquam ac, risus. Quisque lobortis. Phasellus pellentesque purus in massa. Aenean in pede. Phasellus ac libero ac tellus pellentesque semper. Sed ac felis. Sed commodo, magna quis lacinia ornare, quam ante aliquam nisi, eu iaculis leo purus venenatis dui. </p> <ul> <li>List item</li> <li>List item</li> <li>List item</li> <li>List item</li> <li>List item</li> <li>List item</li> <li>List item</li> </ul> </div> </div> </body> </html>

查看演示

当悬停时打开

点击头部展开/折叠被分为各个逻辑部分的内容，就像标签页（tabs）一样。您可以选择性地设置当鼠标悬停时是否切换各部分的打开/关闭状态。

基本的 HTML 标记是一系列的标题（H3 标签）和内容 div，因此内容不用通过 JavaScript 即可用。

<!doctype html> <html> <head> <meta charset="utf-8"> <title>jQuery UI 折叠面板（Accordion） - 当悬停时打开</title> <link rel="stylesheet" href="//code.jquery.com/ui/1.10.4/themes/smoothness/jquery-ui.css"> <script src="//code.jquery.com/jquery-1.9.1.js"></script> <script src="//code.jquery.com/ui/1.10.4/jquery-ui.js"></script> <link rel="stylesheet" href="http://jqueryui.com/resources/demos/style.css"> <script> $(function() { $( "#accordion" ).accordion({ event: "click hoverintent" }); }); /* * hoverIntent | Copyright 2011 Brian Cherne * http://cherne.net/brian/resources/jquery.hoverIntent.html * modified by the jQuery UI team */ $.event.special.hoverintent={ setup: function() { $( this ).bind( "mouseover", jQuery.event.special.hoverintent.handler ); }, teardown: function() { $( this ).unbind( "mouseover", jQuery.event.special.hoverintent.handler ); }, handler: function( event ) { var currentX, currentY, timeout, args=arguments, target=$( event.target ), previousX=event.pageX, previousY=event.pageY; function track( event ) { currentX=event.pageX; currentY=event.pageY; }; function clear() { target .unbind( "mousemove", track ) .unbind( "mouseout", clear ); clearTimeout( timeout ); } function handler() { var prop, orig=event; if ( ( Math.abs( previousX - currentX ) + Math.abs( previousY - currentY ) ) < 7 ) { clear(); event=$.Event( "hoverintent" ); for ( prop in orig ) { if ( !( prop in event ) ) { event[ prop ]=orig[ prop ]; } } // 防止访问原始事件，因为新事件会被异步触发，旧事件不再可用 (#6028) delete event.originalEvent; target.trigger( event ); } else { previousX=currentX; previousY=currentY; timeout=setTimeout( handler, 100 ); } } timeout=setTimeout( handler, 100 ); target.bind({ mousemove: track, mouseout: clear }); } }; </script> </head> <body> <div id="accordion"> <h3>部分 1</h3> <div> <p> Mauris mauris ante, blandit et, ultrices a, suscipit eget, quam. Integer ut neque. Vivamus nisi metus, molestie vel, gravida in, condimentum sit amet, nunc. Nam a nibh. Donec suscipit eros. Nam mi. Proin viverra leo ut odio. Curabitur malesuada. Vestibulum a velit eu ante scelerisque vulputate. </p> </div> <h3>部分 2</h3> <div> <p> Sed non urna. Donec et ante. Phasellus eu ligula. Vestibulum sit amet purus. Vivamus hendrerit, dolor at aliquet laoreet, mauris turpis porttitor velit, faucibus interdum tellus libero ac justo. Vivamus non quam. In suscipit faucibus urna. </p> </div> <h3>部分 3</h3> <div> <p> Nam enim risus, molestie et, porta ac, aliquam ac, risus. Quisque lobortis. Phasellus pellentesque purus in massa. Aenean in pede. Phasellus ac libero ac tellus pellentesque semper. Sed ac felis. Sed commodo, magna quis lacinia ornare, quam ante aliquam nisi, eu iaculis leo purus venenatis dui. </p> <ul> <li>List item one</li> <li>List item two</li> <li>List item three</li> </ul> </div> <h3>部分 4</h3> <div> <p> Cras dictum. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Aenean lacinia mauris vel est. </p> <p> Suspendisse eu nisl. Nullam ut libero. Integer dignissim consequat lectus. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. </p> </div> </div> </body> </html>

查看演示

排序（Sortable）

拖拽标题来给面板重新排序。

<!doctype html> <html> <head> <meta charset="utf-8"> <title>jQuery UI 折叠面板（Accordion） - 排序（Sortable）</title> <link rel="stylesheet" href="//code.jquery.com/ui/1.10.4/themes/smoothness/jquery-ui.css"> <script src="//code.jquery.com/jquery-1.9.1.js"></script> <script src="//code.jquery.com/ui/1.10.4/jquery-ui.js"></script> <link rel="stylesheet" href="http://jqueryui.com/resources/demos/style.css"> <style> /* 当排序时，IE 存在布局问题（查看 #5413） */ .group { zoom: 1 } </style> <script> $(function() { $( "#accordion" ) .accordion({ header: "> div > h3" }) .sortable({ axis: "y", handle: "h3", stop: function( event, ui ) { // 当排序时，IE 不能注册 blur，所以触发 focusout 处理程序来移除 .ui-state-focus ui.item.children( "h3" ).triggerHandler( "focusout" ); } }); }); </script> </head> <body> <div id="accordion"> <div> <h3>部分 1</h3> <div> <p>Mauris mauris ante, blandit et, ultrices a, suscipit eget, quam. Integer ut neque. Vivamus nisi metus, molestie vel, gravida in, condimentum sit amet, nunc. Nam a nibh. Donec suscipit eros. Nam mi. Proin viverra leo ut odio. Curabitur malesuada. Vestibulum a velit eu ante scelerisque vulputate.</p> </div> </div> <div> <h3>部分 2</h3> <div> <p>Sed non urna. Donec et ante. Phasellus eu ligula. Vestibulum sit amet purus. Vivamus hendrerit, dolor at aliquet laoreet, mauris turpis porttitor velit, faucibus interdum tellus libero ac justo. Vivamus non quam. In suscipit faucibus urna. </p> </div> </div> <div> <h3>部分 3</h3> <div> <p>Nam enim risus, molestie et, porta ac, aliquam ac, risus. Quisque lobortis. Phasellus pellentesque purus in massa. Aenean in pede. Phasellus ac libero ac tellus pellentesque semper. Sed ac felis. Sed commodo, magna quis lacinia ornare, quam ante aliquam nisi, eu iaculis leo purus venenatis dui. </p> <ul> <li>List item one</li> <li>List item two</li> <li>List item three</li> </ul> </div> </div> <div> <h3>部分 4</h3> <div> <p>Cras dictum. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Aenean lacinia mauris vel est. </p><p>Suspendisse eu nisl. Nullam ut libero. Integer dignissim consequat lectus. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. </p> </div> </div> </div> </body> </html>

我们使用CSS来对一个高度未定的元素添加折叠动画时，会遇到使用transition来对Height从0到auto添加过度动画，动画并没有生效的问题；

幸运的是，现在有了解决方案：使用表格布局，实现简单并且效果完美；

通常以前对于这种场景，使用CSS来实现：使用max-height 或者 scaleY 貌似能够解决；但是会有不同程度的问题：

max-height:

折叠时设置max-height为零，展开时设置max-height为一个较大的值；

弊端：因为需要尽可能保证max-height大于折叠内容的宽度，需要将max-height设置的比较大，导致展开时动画速度变慢，并且折叠时有短暂的停顿；

scaleY

通过scaleY 0 - 1的过渡实现，但是动画过程中可见内容被挤压变形，体验不好；

现在如果用网格布局来实现，让我们来试下：

grid-template-rows

html结构：

html复制代码<div class="accordion">
  <div class="accordion-title">Hover me!</div>
  <div class="accordion-body">
    <div>
      <p>Lorem ipsum ...</p>
    </div>
  </div>
</div>
css复制代码.accordion-body {
  display: grid; 
  grid-template-rows: 0fr;
  transition: 250ms grid-template-rows ease;
}

.accordion:hover .accordion-body {
  grid-template-rows: 1fr;
}

.accordion-body > div {
  overflow: hidden;
}

效果：

原文链接：

https://dev.to/francescovetere/css-trick-transition-from-height-0-to-auto-21de

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max-height:

scaleY

grid-template-rows

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