傳遞給window.prompt的文本被替換爲「...」

Question

我想允許用戶將大量電子郵件地址複製到其剪貼板。這個答案似乎是最可靠的方式做到這一點：

How do I copy to the clipboard in JavaScript?

不過，測試時我發現，window.prompt()總是替換與...的電子郵件一個一部分。

下面是測試數據：

test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
test@test.com; test@test.com;test@test.com;test@test.com;test@test.com; 
test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
test@test.com;test@test.com; 

下面是示例代碼用下面的測試數據：

window.prompt ("To copy emails to clipboard, press: Ctrl+C, then Enter", 
    "test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
    test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
    test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
    test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
    test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
    test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
    test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
    test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
    test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
    test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
    test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
    test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
    test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
    test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
    test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
    test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
    test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
    test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
    test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
    test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
    test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
    test@test.com; test@test.com;test@test.com;test@test.com;test@test.com; 
    test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
    test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
    test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
    test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
    test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
    test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
    test@test.com;test@test.com;test@test.com;test@test.com;test@test.com; 
    test@test.com;test@test.com;"); 

的jsfiddle：http://jsfiddle.net/MkYDz/

點擊上面的鏈接，複製和粘貼文本添加到文本編輯器中，您將看到其中一封電子郵件（大約一半）變爲：

test@...om 

這是爲什麼發生？

Answer 1

的字符數限制的提示似乎像MVP說的原因。 它有一個相當好的解決方法。 使用textarea作爲其內容的電子郵件文本，並使用select函數來選擇textarea中的整個文本，就像您對提示進行的操作一樣。

實施例：

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

假設，則使用jquery。如果沒有，你可以在textarea DOM元素上使用select函數。

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

Answer 2

Chromium中的window.prompt（）函數被限制爲2000個字符。如果輸入字符串超過此限制（您的示例中有2059個字符），則輸入字符串將在中間用點標記。這被稱爲ellipsis。

下面是使用完全相同2000個字符（我更換了最後三個字符用XXX）演示：http://jsfiddle.net/MkYDz/2/

;test@tesXXX"); 

Answer 3

如果我有更多的聲譽分，我將在Jitesh的答案評論...

如果你不使用jQuery，你不能做到這一點：

emailsTxtArea.select().focus(); 

相反，你必須這樣做：

emailsTxtArea.select(); 
emailsTxtArea.focus(); 

在普通的javascript中，select方法不返回對象。