CSS Effect: How to automatically add an expand button when two lines of text overflow?

Elegant handling of web text overflow: Automatically add expand buttons

In web design, text overflow processing is crucial. When the text is too long, how can you ensure both beauty and provide a good user experience? This article discusses a solution: when the text exceeds two lines, an expand button will be automatically added, and click the button to display the complete content.

Traditional methods use attributes such as -webkit-line-clamp to display ellipses on two lines of text. But for a more user-friendly experience, we want to use the expand button instead of the ellipsis. This requires solving the following key issues:

• Accurately judge the overflow of text lines: How to determine whether the text has exceeded two lines?
• Dynamic Show/Hide Expand Button: The button is displayed only if the text overflows.
• Button position and status toggle: The button should be located in the lower right corner of the text and can switch icons or text according to the expanded/collapse status.

An article titled "CSS Implementing Multi-Line Text "Expand and Close"" explores the solution to this problem in depth. The article points out that the challenge in implementing this function is:

• Press button precise positioning: The button must always be located in the lower right corner of multiple lines of text.
• State switching mechanism: realizes smooth switching between "expand" and "collapse" states.
• Conditional judgment: The button is displayed only when the text exceeds the specified number of lines.

By solving the above challenges, we can create a beautiful and practical text overflow processing solution to improve the user experience.

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