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們時常會遇到這樣的問題，文字太長致使頁面被拉的太長，加載起來很困難，而且用戶沒有耐心來看這么長篇幅的內容，看到就煩躁而調走，這時候我們就需要一個可以把文字隱藏一部分的功能，然后通過一個點擊來展開或者引導登錄或者關注后在展開。
如此我們可以得到注冊量和關注量，從而達到我們想要的效果！具體作用就不再這里做詳細分析了，相信大家已經知道他們的用途了！下面來看下效果吧！
收起后效果：
收起效果
點擊“查看全文”后的效果
展開效果
源碼也共享給大家，可以自行復制，這次沒有單獨的js，可以直接復制使用哦
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<span style="font-size: 9pt"> <b>文字的折疊和展開效果：</b>我是折疊后的內容，點擊展開后我會消失，只要把展開的開頭內容設置和我一樣了就可以了...[<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>
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<b>文字的折疊和展開效果：</b>我是展開后的內容，收起后我會消失，我是展開后的內容，收起后我會消失，我是展開后的內容，收起后我會消失，我是展開后的內容，收起后我會消失，我是展開后的內容，收起后我會消失，我是展開后的內容，收起后我會消失，我是展開后的內容，收起后我會消失，我是展開后的內容，收起后我會消失，我是展開后的內容，收起后我會消失，我是展開后的內容，收起后我會消失，我是展開后的內容，收起后我會消失，我是展開后的內容，收起后我會消失，我是展開后的內容，收起后我會消失，我是展開后的內容，收起后我會消失，我是展開后的內容，收起后我會消失，我是展開后的內容，收起后我會消失，我是展開后的內容，收起后我會消失，我是展開后的內容，收起后我會消失，我是展開后的內容，收起后我會消失，我是展開后的內容，收起后我會消失，我是展開后的內容，收起后我會消失，我是展開后的內容，收起后我會消失，我是展開后的內容，收起后我會消失，
[<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>
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文章由vv：java-hadoop整理發布，轉載請注明出處
一個有限的空間內顯示用于呈現信息的可折疊的內容面板。
如需了解更多有關 accordion 部件的細節，請查看 API 文檔 折疊面板部件（Accordion Widget）。
默認功能
點擊頭部展開/折疊被分為各個邏輯部分的內容，就像標簽頁（tabs）一樣。您可以選擇性地設置當鼠標懸停時是否切換各部分的打開/關閉狀態。
基本的 HTML 標記是一系列的標題（H3 標簽）和內容 div，因此內容不用通過 JavaScript 即可用。
<!doctype html> <html> <head> <meta charset="utf-8"> <title>jQuery UI 折疊面板（Accordion） - 默認功能</title> <link rel="stylesheet" > <script src="http://code.jquery.com/jquery-1.9.1.js"></script> <script src="http://code.jquery.com/ui/1.10.4/jquery-ui.js"></script> <link rel="stylesheet" > <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>折疊內容
默認情況下，折疊面板總是保持一個部分是打開的。為了讓所有部分都是折疊的，可設置 collapsible 選項為 true。點擊當前打開的部分，來折疊它的內容面板。
<!doctype html> <html> <head> <meta charset="utf-8"> <title>jQuery UI 折疊面板（Accordion） - 折疊內容</title> <link rel="stylesheet" > <script src="http://code.jquery.com/jquery-1.9.1.js"></script> <script src="http://code.jquery.com/ui/1.10.4/jquery-ui.js"></script> <link rel="stylesheet" > <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
自定義圖標
通過 icons 選項自定義標題圖標，icons 選項接受標題默認的和激活的（打開的）狀態的 class。使用 UI CSS 框架中的任意 class，或者使用背景圖像創建自定義的 class。
<!doctype html> <html> <head> <meta charset="utf-8"> <title>jQuery UI 折疊面板（Accordion） - 自定義圖標</title> <link rel="stylesheet" > <script src="http://code.jquery.com/jquery-1.9.1.js"></script> <script src="http://code.jquery.com/ui/1.10.4/jquery-ui.js"></script> <link rel="stylesheet" > <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">切換圖標</button> </body> </html>查看演示
填充空間
由于折疊面板是由塊級元素組成的，默認情況下它的寬度會填充可用的水平空間。為了填充由容器分配的垂直空間，設置 heightStyle 選項為 "fill"，腳本會自動設置折疊面板的尺寸為父容器的高度。
<!doctype html> <html> <head> <meta charset="utf-8"> <title>jQuery UI 折疊面板（Accordion） - 填充空間</title> <link rel="stylesheet" > <script src="http://code.jquery.com/jquery-1.9.1.js"></script> <script src="http://code.jquery.com/ui/1.10.4/jquery-ui.js"></script> <link rel="stylesheet" > <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>重新調整外部容器：</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>非自動高度
設置 heightStyle: "content"，讓折疊面板保持它們初始的高度。
<!doctype html> <html> <head> <meta charset="utf-8"> <title>jQuery UI 折疊面板（Accordion） - 非自動高度</title> <link rel="stylesheet" > <script src="http://code.jquery.com/jquery-1.9.1.js"></script> <script src="http://code.jquery.com/ui/1.10.4/jquery-ui.js"></script> <link rel="stylesheet" > <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
當懸停時打開
點擊頭部展開/折疊被分為各個邏輯部分的內容，就像標簽頁（tabs）一樣。您可以選擇性地設置當鼠標懸停時是否切換各部分的打開/關閉狀態。
基本的 HTML 標記是一系列的標題（H3 標簽）和內容 div，因此內容不用通過 JavaScript 即可用。
<!doctype html> <html> <head> <meta charset="utf-8"> <title>jQuery UI 折疊面板（Accordion） - 當懸停時打開</title> <link rel="stylesheet" > <script src="http://code.jquery.com/jquery-1.9.1.js"></script> <script src="http://code.jquery.com/ui/1.10.4/jquery-ui.js"></script> <link rel="stylesheet" > <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 ]; } } // 防止訪問原始事件，因為新事件會被異步觸發，舊事件不再可用 (#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）
拖拽標題來給面板重新排序。
<!doctype html> <html> <head> <meta charset="utf-8"> <title>jQuery UI 折疊面板（Accordion） - 排序（Sortable）</title> <link rel="stylesheet" > <script src="http://code.jquery.com/jquery-1.9.1.js"></script> <script src="http://code.jquery.com/ui/1.10.4/jquery-ui.js"></script> <link rel="stylesheet" > <style> /* 當排序時，IE 存在布局問題（查看 #5413） */ .group { zoom: 1 } </style> <script> $(function() { $( "#accordion" ) .accordion({ header: "> div > h3" }) .sortable({ axis: "y", handle: "h3", stop: function( event, ui ) { // 當排序時，IE 不能注冊 blur，所以觸發 focusout 處理程序來移除 .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>我們使用CSS來對一個高度未定的元素添加折疊動畫時，會遇到使用transition來對Height從0到auto添加過度動畫，動畫并沒有生效的問題；
幸運的是，現在有了解決方案： 使用表格布局，實現簡單并且效果完美；
通常以前對于這種場景，使用CSS來實現：使用max-height 或者 scaleY 貌似能夠解決；但是會有不同程度的問題：
折疊時設置max-height為零，展開時設置max-height為一個較大的值；
弊端： 因為需要盡可能保證max-height大于折疊內容的寬度，需要將max-height設置的比較大，導致展開時動畫速度變慢，并且折疊時有短暫的停頓；
通過scaleY 0 - 1的過渡實現，但是動畫過程中可見內容被擠壓變形，體驗不好；
現在如果用網格布局來實現，讓我們來試下：
html結構：
html復制代碼<div class="accordion">
<div class="accordion-title">Hover me!</div>
<div class="accordion-body">
<div>
<p>Lorem ipsum ...</p>
</div>
</div>
</div>
css復制代碼.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：
原文鏈接：
https://dev.to/francescovetere/css-trick-transition-from-height-0-to-auto-21de
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