检测所选文本是否跨越整行或多行

发布于 2024-12-27 19:31:58 字数 510 浏览 0 评论 0原文

我正在尝试自动检测文本区域的选择是否包含新行，或者是否已选择整行。

例如

[abc def] xyz =>应该为 false，因为只选择了 [abc def]
[abc def xyz] =>应该为 true，因为已选择整行
选择跨越多行 (true):
<前><代码> abc [def xyz abc 定义 xyz abc def] xyz

这将检测最后一种情况：

var range = getTextAreaSelection(textarea),
    selection = textarea.value.substring(range[0], range[1]);

if(selection.indexOf('\n') !== -1)
  // do stuff...

但是我如何处理其他两种情况？

原文

I'm trying to auto-detect if the selection of a textarea contains new lines, or if the full line has been selected.

For example

[abc def] xyz => should be false, because only [abc def] is selected
[abc def xyz] => should be true, because the entire line has been selected
the selection spans across multiple lines (true):
```
 abc [def xyz
 abc def xyz
 abc def] xyz
```

This will detect the last case:

var range = getTextAreaSelection(textarea),
    selection = textarea.value.substring(range[0], range[1]);

if(selection.indexOf('\n') !== -1)
  // do stuff...

But how do I handle the other two?

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友谊不毕业 2025-01-03 19:31:58

您可以检查之前/之后的字符是什么：

textarea.value.charAt(range[0] - 1); // if it's `\r` or `\n` it's the first char of a line
textarea.value.charAt(range[1] + 1); // same fot last char of a line

如果其中一个或两个返回空字符串，则它是文本区域值的开头/结尾，因此也算作整行。

You could check what the character before/after is:

textarea.value.charAt(range[0] - 1); // if it's `\r` or `\n` it's the first char of a line
textarea.value.charAt(range[1] + 1); // same fot last char of a line

If either or both return an empty string, it's the beginning/ending of the textarea value so that would also count as a full line.

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