传递给window.prompt的文本将替换为“...” [英] Text passed to window.prompt gets replaced with "..."

问题描述

我想允许用户将大量电子邮件地址复制到剪贴板。这个答案似乎是最可靠的方法：

I want to allow users to copy a large number of email addresses to their clipboard. This answer seemed like the most reliable way to do that:

如何用JavaScript复制到剪贴板？

然而，当我发现测试时那个 window.prompt（） 总是用替换一个电子邮件的一部分.. 。。

However, when testing I found that window.prompt() always replaces part of one of the emails with ....

这是测试数据：

[e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
[e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
[e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
[e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
[e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
[e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
[e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
[e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
[e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
[e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
[e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
[e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
[e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
[e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
[e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
[e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
[e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
[e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
[e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
[e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
[e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
[e-mail]; [e-mail];[e-mail];[e-mail];[e-mail];
[e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
[e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
[e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
[e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
[e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
[e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
[e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
[e-mail];[e-mail];

以下是包含以下测试数据的示例代码：

Here is example code with the following test data:

window.prompt ("To copy emails to clipboard, press: Ctrl+C, then Enter", 
  "[e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
  [e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
  [e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
  [e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
  [e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
  [e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
  [e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
  [e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
  [e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
  [e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
  [e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
  [e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
  [e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
  [e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
  [e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
  [e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
  [e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
  [e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
  [e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
  [e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
  [e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
  [e-mail]; [e-mail];[e-mail];[e-mail];[e-mail];
  [e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
  [e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
  [e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
  [e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
  [e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
  [e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
  [e-mail];[e-mail];[e-mail];[e-mail];[e-mail];
  [e-mail];[e-mail];");

JSFiddle： http://jsfiddle.net/MkYDz/

JSFiddle: http://jsfiddle.net/MkYDz/

点击上面的链接，将文本复制并粘贴到文本编辑器，您将看到其中一封电子邮件（大约一半）变为：

Click on the link above, copy and paste the text to a text editor, and you will see that one of the emails (about halfway) becomes:

test@...om

为什么会发生这种情况？

Why is this happening?

推荐答案

提示的字符限制似乎就像MVP所说的那样。
有一个非常好的解决方法。
使用 textarea 并将电子邮件文本作为其内容，并使用 select 函数选择全文在textarea中，就像你提到的那样。

The character limit for the prompt seems to be the reason like MVP said. There is a pretty better workaround for it. Use a textarea with the emails text as its content and use the select function to select the whole text in the textarea like you did with the prompt.

示例：

$('#container').append('To copy emails to clipboard, press: Ctrl+C, then Enter <br />
<textarea id="emailsToCopy">'+emailsToCopy+'</textarea>');
$('#emailsToCopy').select().focus();

假设您使用jquery。如果没有，你可以在textarea DOM元素上使用选择函数。

Assuming, you use jquery. If not you could use select function on the textarea DOM element.

var emailsTxtArea = document.getElementById(emailsToCopy);
emailsTxtArea.select();
emailsTxtArea.focus();

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