问题
Is it possible to detect where text wraps?
Lorem ipsum dolor sit amet
lets say that above text wraps after 'dolor' word. How to detect that and insert there some mark of it so it would be Lorem ipsum dolor<div class='wrap-mark'/> sit amet for example?
回答1:
I've seen this problem solved a few different ways. One of my favorites involves creating a div that mirrors the width of the container that holds your text. You then print words of your content into faux-container one-by-one, measuring the height of the container along the way. When the height of the container changes, you know you have a line feed/wrap.
Facebook and a few other CMS's use a method like this to grow their textareas to fit the contents of a user's input. I'm sure you could probably glean a few more creative ways to measure your text by researching those techniques, too.
回答2:
Use the soft-hyphen entity to mark the wrapping position, plus the non-breaking-space entity to separate words without whitespace. The non-breaking space needs to come before the soft hyphen for IE10. Here is an example:
Here is a cross-browser solution:
<!doctype html>
<html>
<head>
<title>Soft Hyphen Text Wrapping</title>
<style>
/* Generate space after each soft hyphen */
.fake-space:after { content: "\00a0"; }
@media all and (-ms-high-contrast: none) {
/* Generate space before each soft hyphen for IE10 */
.fake-space:before { content: "\00a0"; }
.fake-space:after { content: ""; }
}
</style>
</head>
<body>
<!--Paragraph with words separated by soft hypen entity wrapped in a span-->
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</body>
</html>
References
- Yes, SOFT HYPHEN is a hard problem
- Unicode Line Breaking Algorithm
- The WBR tag
- Soft Hyphen - A Hard Problem?
- No-wrapping and Softwrapping: with NOBR, WBR and ­
- nobr and wbr
- Suggested Word Break
- The WBR Element
来源：https://stackoverflow.com/questions/13628337/is-it-possible-to-detect-when-text-wraps