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js implements the function of copying text files (detailed step-by-step explanation)

php中世界最好的语言Original: 2018-04-28 13:34:544610browse

This time I will bring you the function of copying text files in js (detailed step-by-step explanation). What are the precautions for realizing the function of copying text files in js. The following is a practical case, let's take a look.

I recently encountered a need to click a button to copy the text in the

tag to the clipboard

I have copied the contents of the input box before. I thought it was almost the same, but I found that It didn’t work at all

I tried various methods, and finally used a blind trick to achieve the following effect

##1. Principle analysis

The browser provides the copy command, which can copy the selected content

document.execCommand("copy")

If it is an input box, you can use the

select() method, Select the text in the input box, and then call the copy command to copy the text to the clipboard

But the select() method is only valid for and

, but not for <p> <p style="text-align: left;"></p>My final solution is to add a <textarea> to the page and then hide it<p style="text-align: left;"></p>
<p style="text-align: left;">When clicking the button, first remove the <textarea> Change value to the innerText of <p>, and then copy the content in <textarea> <strong></strong></p>
<p style="text-align: left;">2. Code implementation<strong></strong></p>HTML part<p style="text-align: left;"></p>
<pre class="brush:php;toolbar:false"><style type="text/css">
  .wrapper {position: relative;}
  #input {position: absolute;top: 0;left: 0;opacity: 0;z-index: -10;}
</style>
<p class="wrapper">
  <p id="text">我把你当兄弟你却想着复制我？</p>
  <textarea id="input">这是幕后黑手</textarea>
  <button onclick="copyText()">copy</button>
</p></pre> JS part<p style="text-align: left;"></p>
<pre class="brush:php;toolbar:false"><script type="text/javascript">
  function copyText() {
   var text = document.getElementById("text").innerText;
   var input = document.getElementById("input");
   input.value = text; // 修改文本框的内容
   input.select(); // 选中文本
   document.execCommand("copy"); // 执行浏览器复制命令
   alert("复制成功");
  }
 </script></pre>Personal test, Firefox 48.0, Chrome 60.0, IE 8 can all be used<p style="text-align: left;"></p>I believe you have mastered the method after reading the case in this article. For more exciting things, please pay attention to php Chinese Other related articles online! <p></p>Recommended reading: <p></p>
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