使用 css-类中的样式将富文本复制到剪贴板

Question

我使用 this method 从 html 元素复制富文本。问题是，如果样式不是内联在 html 中，而是来自 css，则此方法不起作用。现有代码破坏了格式并且没有考虑样式。这是代码。

HTML

<button onclick="copyToClip(document.getElementById('foo').innerHTML)">
  Copy the stuff
  </button>

<div id=foo>
  You can write some JS to generate this data. 
  It can contain rich stuff.
  <b> test </b> me <i> also </i>
  <div class="green">Hello world</div> You can use setData to put TWO COPIES into the same clipboard, one that is plain and one that is rich. That way your users can paste into either a
  <ul>
    <li>plain text editor</li>
    <li>or into a rich text editor</li>
  </ul>
</div>

CSS

.green {
  display: inline;
  color: green;
}

JavaScript

function copyToClip(str) {
  function listener(e) {
    e.clipboardData.setData("text/html", str);
    e.clipboardData.setData("text/plain", str);
    e.preventDefault();
  }
  document.addEventListener("copy", listener);
  document.execCommand("copy");
  document.removeEventListener("copy", listener);
};

范例in Codepen.

Answer 1

添加到复制文本的换行符是因为“块级元素”，即使您在 css sheet 中添加 "display : inline"

见W3 HTML Block and Inline Elements

为避免这种情况，我们需要更改任何具有内联显示的块级元素，并将所有样式（包括默认样式）恢复为新标签

最后代码会像这样：

Codepen

注意 : 代码注释中的解释

function CopyToClipboard(element) {
 // array off all block level elements
 var block_level_elements = ['P','H1', 'H2', 'H3', 'H4', 'H5', 'H6','OL', 'UL','DIV','FORM','HR','TABLE']; 

 //create new Element so we can change elments like we need
 var newelment = document.createElement("div");

 //copy target Element to the new Element
 newelment.innerHTML = document.getElementById(element).innerHTML;

 //hide new Element to body
 newelment.style.opacity  = 0;
 // add new Element to body
 document.body.appendChild(newelment);

 //get all element childs
 var descendents = newelment.getElementsByTagName('*');

 //loop in childs
 for (var i = 0; i < descendents.length; ++i) {
  //get defult Style
     var style = window.getComputedStyle(descendents[i]);
     var dis = style.getPropertyValue('display');
     //get defult tag name
     var tagname = descendents[i].tagName;
  
  //---------------------------
  //this part is little tricky
  //---------------------------
  //true : Element is a block level elements and css display is inline
     if(dis.includes("inline") && block_level_elements.includes(tagname)){
      //get all Element style include default style
   var defultcss = document.defaultView.getComputedStyle(descendents[i], "").cssText;
   //chang Element tag from block level elements to inline level elements (span)
   descendents[i].outerHTML = descendents[i].outerHTML.replace(new RegExp(tagname, "ig"),"span");   //todo: need to change RegExp to tag name only not inner text 
   //add all Element style include default style to new tag
   descendents[i].style.cssText = defultcss;
  }
 }
 //-----------------copy new Element--------------
 var doc = document;
 var range, selection;
    
 if (doc.body.createTextRange)
    {
  range = doc.body.createTextRange();
  range.moveToElementText(newelment);
  range.select();
 } 
    
    else if (window.getSelection)
    {
  selection = window.getSelection();        
  range = doc.createRange();
  range.selectNodeContents(newelment);
  selection.removeAllRanges();
  selection.addRange(range);
  }
 document.execCommand('copy');
 window.getSelection().removeAllRanges();
 
 // remove new Element from document
 document.body.removeChild(newelment);  
 
 document.getElementById("copybtn").innerHTML="Copied";
 
}

.green {
  display: inline;
  color: green;
  white-space: nowrap;
}

  <button id='copybtn' onclick="CopyToClipboard('foo')">
  Copy the stuff
  </button>
  
<div id='foo'>
  You can write some JS to generate this data. 
  It can contain rich stuff.
  <b> test </b> me <i> also </i>
  <div class="green" style="color: green;">Hello world</div> , <h3 class="green" style="color: green;">header3</h3> You can use setData to put TWO COPIES into the same clipboard, one that is plain and one that is rich. That way your users can paste into either a
  <ul>
    <li>plain text editor</li>
    <li>or into a rich text editor</li>
  </ul>
</div>

使用 css-类中的样式将富文本复制到剪贴板

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使用 css-类 中的样式将富文本复制到剪贴板

Copy rich text to clipboard with styles from css-classes

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使用 css-类中的样式将富文本复制到剪贴板