纯CSS解决方案截断多行字符

我有一个类似的问题，并从Hackingui.com找到了这个优秀的css解决方案。您可以阅读文章获取信息，但下面是主要代码。

我测试过了，效果很好。希望有人在选择JS或服务器端选项之前发现它有用

  /* styles for '...' */ 
.block-with-text {
  /* hide text if it more than N lines  */
  overflow: hidden;
  /* for set '...' in absolute position */
  position: relative; 
  /* use this value to count block height */
  line-height: 1.2em;
  /* max-height = line-height (1.2) * lines max number (3) */
  max-height: 3.6em; 
  /* fix problem when last visible word doesn't adjoin right side  */
  text-align: justify;  
  /* place for '...' */
  margin-right: -1em;
  padding-right: 1em;
}

/* create the ... */
.block-with-text:before {
  /* points in the end */
  content: '...';
  /* absolute position */
  position: absolute;
  /* set position to right bottom corner of block */
  right: 0;
  bottom: 0;
}

/* hide ... if we have text, which is less than or equal to max lines */
.block-with-text:after {
  /* points in the end */
  content: '';
  /* absolute position */
  position: absolute;
  /* set position to right bottom corner of text */
  right: 0;
  /* set width and height */
  width: 1em;
  height: 1em;
  margin-top: 0.2em;
  /* bg color = bg color under block */
  background: white;
}

75个字符

我已经尝试了最大宽度，但这打乱了我的布局。

使用max-width: 75ch，然后创建一个布局，当你超过这个宽度时不会乱。

这在CSS中是不可能的，你必须使用Javascript。虽然你可以设置p的宽度为30个字符，下一个字母会自动下来，但这不会那么准确，如果字符是大写的，会有所不同。

纯CSS解决方案截断多行字符

我有一个类似的问题，并从Hackingui.com找到了这个优秀的css解决方案。您可以阅读文章获取信息，但下面是主要代码。

我测试过了，效果很好。希望有人在选择JS或服务器端选项之前发现它有用

  /* styles for '...' */ 
.block-with-text {
  /* hide text if it more than N lines  */
  overflow: hidden;
  /* for set '...' in absolute position */
  position: relative; 
  /* use this value to count block height */
  line-height: 1.2em;
  /* max-height = line-height (1.2) * lines max number (3) */
  max-height: 3.6em; 
  /* fix problem when last visible word doesn't adjoin right side  */
  text-align: justify;  
  /* place for '...' */
  margin-right: -1em;
  padding-right: 1em;
}

/* create the ... */
.block-with-text:before {
  /* points in the end */
  content: '...';
  /* absolute position */
  position: absolute;
  /* set position to right bottom corner of block */
  right: 0;
  bottom: 0;
}

/* hide ... if we have text, which is less than or equal to max lines */
.block-with-text:after {
  /* points in the end */
  content: '';
  /* absolute position */
  position: absolute;
  /* set position to right bottom corner of text */
  right: 0;
  /* set width and height */
  width: 1em;
  height: 1em;
  margin-top: 0.2em;
  /* bg color = bg color under block */
  background: white;
}

这篇文章是关于一个CSS解决方案的，但这篇文章已经很老了，所以为了防止其他人偶然发现这一点，并且正在使用一个现代的JS框架，比如Angular 4+，有一个简单的方法可以通过Angular Pipes来实现这一点，而不必在CSS上瞎忙活。

可能也有“React”或“Vue”的方法来做到这一点。这只是为了展示如何在框架中完成它。

truncate-text.pipe.ts

/**
 * Helper to truncate text using JS in view only.
 *
 * This is pretty difficult to do reliably with CSS, especially when there are
 * multiple lines.
 *
 * Example: {{ value | truncateText:maxLength }} or {{ value | truncateText:45 }}
 *
 * If maxLength is not provided, the value will be returned without any truncating. If the
 * text is shorter than the maxLength, the text will be returned untouched. If the text is greater
 * than the maxLength, the text will be returned with 3 characters less than the max length plus
 * some ellipsis at the end to indicate truncation.
 *
 * For example: some really long text I won't bother writing it all ha...
 */
@Pipe({ name: 'truncateText' })
export class TruncateTextPipe implements PipeTransform {
  transform(value: string, ...args: any[]): any {
    const maxLength = args[0]
    const maxLengthNotProvided = !maxLength
    const isShorterThanMaximumLength = value.length < maxLength
    if (maxLengthNotProvided || isShorterThanMaximumLength) {
      return value
    }
    const shortenedString = value.substr(0, maxLength - 3)
    return `${shortenedString}...`
  }
}

app.component.html

<h1>{{ application.name | truncateText:45 }}</h1>

用两种不同的方法试试我的解决方案。

<div class="wrapper">
      <p class="demo-1">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Ut odio temporibus voluptas error distinctio hic quae corrupti vero doloribus optio! Inventore ex quaerat modi blanditiis soluta maiores illum, ab velit.</p>
</div>

<div class="wrapper">
  <p class="demo-2">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Ut odio temporibus voluptas error distinctio hic quae corrupti vero doloribus optio! Inventore ex quaerat modi blanditiis soluta maiores illum, ab velit.</p>
</div>

.wrapper {
  padding: 20px;
  background: #eaeaea;
  max-width: 400px;
  margin: 50px auto;
}

.demo-1 {
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
}

.demo-2 {
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  max-width: 150px;
}