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How to copy content to clipboard in JS

php中世界最好的语言
php中世界最好的语言Original
2018-04-12 15:54:012381browse

This time I will show you how to copy content to the clipboard with JS. What are the precautions for copying content to the clipboard with JS? The following is a practical case. Get up and take a look.

Common methods

After checking the all-powerful Google, the common methods now are mainly the following two:

Third-party library: clipboard.js

Native method:
document.execCommand()

Let’s take a look at how these two methods are used.

clipboard.js

This is the official website of clipboard:

https://clipboardjs.com/, it seems so simple.

Quote

Direct quote:

Package:

npm install clipboard --save , then import Clipboard from 'clipboard';

use

Copy from input box

Now there is an <input> tag on the page, we need to copy the content inside it, we can do this:

<input id="demoInput" value="hello world">
<button class="btn" data-clipboard-target="#demoInput">点我复制</button>
import Clipboard from 'clipboard';
const btnCopy = new Clipboard('btn');
Notice that a

data-clipboard-target attribute is added to the 

import Clipboard from 'clipboard';
const btnCopy = new Clipboard('btn');
this.copyValue = 'hello world';

event

Sometimes we need to do something after copying, in which case we need the support of

callback function.

Add the following code to the processing function: 

// 复制成功后执行的回调函数
clipboard.on('success', function(e) {
 console.info('Action:', e.action); // 动作名称，比如：Action: copy
 console.info('Text:', e.text); // 内容，比如：Text：hello word
 console.info('Trigger:', e.trigger); // 触发元素：比如：<button class="btn" :data-clipboard-text="copyValue">点我复制</button>
 e.clearSelection(); // 清除选中内容
});
// 复制失败后执行的回调函数
clipboard.on('error', function(e) {
 console.error('Action:', e.action);
 console.error('Trigger:', e.trigger);
});

Summary

The document also mentions that if

clipboard is used in a single page, in order to make lifecycle management more elegant, remember btn.destroy() ## after use. #Destroy it. Isn’t clipboard very simple to use? However, is it not elegant enough to use additional third-party libraries just for a copy function? What should we do at this time? Then use native methods to achieve it.

document.execCommand() method

Let’s first look at how this method is defined on

MDN

:

which allows one to run commands to manipulate the contents of the editable region.

This means that commands can be run to manipulate the contents of the editable area. Note that it is an editable area.

Definition

bool = document.execCommand(aCommandName, aShowDefaultUI, aValueArgument)

The method returns a Boolean value indicating whether the operation was successful.

    aCommandName: Indicates the command name, such as: copy, cut, etc. (see commands for more commands);

  • aShowDefaultUI: Whether to display the user interface, usually false;
  • <p>

    aValueArgument: Some commands require additional parameters, which are generally not used;
  • <p>

compatibility

The compatibility of this method was actually not very good before, but fortunately it is now basically compatible with all mainstream browsers and can also be used on mobile terminals.

use

从输入框复制
现在页面上有一个 <input> 标签，我们想要复制其中的内容，我们可以这样做：

<input id="demoInput" value="hello world">
<button id="btn">点我复制</button>

js代码

const btn = document.querySelector('#btn');
btn.addEventListener('click', () => {
	const input = document.querySelector('#demoInput');
	input.select();
	if (document.execCommand('copy')) {
		document.execCommand('copy');
		console.log('复制成功');
	}
})

其它地方复制

有的时候页面上并没有 <input> 标签，我们可能需要从一个 <p> 中复制内容，或者直接复制变量。

还记得在 execCommand() 方法的定义中提到，它只能操作可编辑区域，也就是意味着除了 <input>、