如何仅通过CSS实现多行文本超长自动省略号

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如何仅通过CSS实现多行文本超长自动省略号

http://www.cnblogs.com/jaxu/category/686860.html

　　在CSS中，我们可以通过下面的样式实现DIV元素中文本超长后自动截断并以省略号结尾：

overflow: hidden;word-break: normal;text-overflow: ellipsis;

　　text-overflow: ellipsis是实现文本截断后以省略号结尾的关键样式，但问题是如果添加该样式则DIV元素内的文本无法自动换行，也就是说该效果只被允许在单行文本上实现。另外，word-break: normal可以防止文字被部分截断，这个在内容为英文的情况下显得尤其重要。

　　要实现多行文本自动截断以省略号结尾的效果，通常的做法是使用JavaScript脚本。下面这些文章给出了如何通过脚本进行字符串截断，不过仅限于英文环境。

http://www.barelyfitz.com/projects/truncate/

http://www.javascriptsource.com/miscellaneous/truncate-text.html

http://www.javascriptbank.com/truncate-html-text.html/en/

　　使用纯CSS样式来实现该效果则会稍微有些麻烦，你需要懂得如何在CSS中进行hack。这里是一个可以在多个通用浏览器中实现该效果的例子:

<!DOCTYPE HTML><html><head>    <style>        html, body, p { margin: 0; padding: 0; font-family: sans-serif;}        .ellipsis {            overflow: hidden;            height: 200px;            line-height: 25px;            margin: 20px;            border: 5px solid #AAA; }        .ellipsis:before {            content:"";            float: left;            width: 5px; height: 200px; }        .ellipsis > *:first-child {            float: right;            width: 100%;            margin-left: -5px; }                .ellipsis:after {            content: "\02026";              box-sizing: content-box;            -webkit-box-sizing: content-box;            -moz-box-sizing: content-box;            float: right; position: relative;            top: -25px; left: 100%;             width: 3em; margin-left: -3em;            padding-right: 5px;                        text-align: right;            background: -webkit-gradient(linear, left top, right top,                from(rgba(255, 255, 255, 0)), to(white), color-stop(50%, white));            background: -moz-linear-gradient(to right, rgba(255, 255, 255, 0), white 50%, white);                        background: -o-linear-gradient(to right, rgba(255, 255, 255, 0), white 50%, white);            background: -ms-linear-gradient(to right, rgba(255, 255, 255, 0), white 50%, white);            background: linear-gradient(to right, rgba(255, 255, 255, 0), white 50%, white); }    </style></head><body>    <div class="ellipsis"><div>        <p>Call me Ishmael.  Some years ago &ndash; never mind how long precisely &ndash; having little or no money in my purse, and nothing particular to interest me on shore, I thought I would sail about a little and see the watery part of the world.  It is a way I have of driving off the spleen, and regulating the circulation.  Whenever I find myself growing grim about the mouth; whenever it is a damp, drizzly November in my soul; whenever I find myself involuntarily pausing before coffin warehouses, and bringing up the rear of every funeral I meet; and especially whenever my hypos get such an upper hand of me, that it requires a strong moral principle to prevent me from deliberately stepping into the street, and methodically knocking people's hats off &ndash; then, I account it high time to get to sea as soon as I can.</p>        </div></div></body></html>

　　通过修改.ellipsis和.ellipsis:before样式中height属性的值来指定容器的高度。该样式的实现在多个不同版本的浏览器下测试通过，注意如果你是在IE下查看则需要确保你的文档模型必须是在标准模式下，即Document Mode必须是Standards。

　　这里是原文出处：http://www.mobify.com/blog/multiline-ellipsis-in-pure-css/

原理：

ellipsis:before (由于float:left)在这里是至关重要的，设置了它之后，才能在文字溢出（文字容器float:right）之后，ellipsis:after也就是省略号的部分移到ellipsis:before的下面（由于float:right,而ellipsis:before固定了高度），看起来是在文字的后面，只是因为设置了left:100%，其实在文字未溢出的时候，省略号一直在文字的下面，也就是因为设置了left:100%，才看不到的。说白了设置那么多float，就是为了在右边的容器高于左边的容器时，省略号容器能改变位置。

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