How to implement pasteboard copy function using JS
This article will analyze 20 lines of JS code to implement the pasteboard function. It is very good and has reference value. Friends in need can refer to it
Using the clipboard is a basic skill. As a coder, everyone should know that Tab, Ctrl/Cmd A, Ctrl/Cmd C and Ctrl/Cmd V are the shortcut keys for auto-focus, copy and paste respectively.
It may not be easy for ordinary users. Even if a user knows what a clipboard is, it will be difficult to highlight the exact text they want (except for) those with great eyesight or quick reflexes. If the user doesn't know the keyboard shortcuts, can't see the hidden editing menu, has never used the right-click menu, or doesn't know that long-pressing the touch screen brings up the options menu, then he will probably not be aware of the copy function.
So should we provide a "Copy to Clipboard" button to help the user? This feature should be useful even for users who are very familiar with keyboard shortcuts.
About clipboard security
A few years ago, it was impossible for browsers to use the clipboard directly. Developers had to implement it through Flash.
The clipboard may seem inconsequential, but imagine what would happen if the browser could see and manipulate the content at will. JS scripts (including third-party scripts) can view the text information in the clipboard and send passwords, sensitive information, or even entire documents to the remote server.
The current clipboard has limited basic functions and has the following restrictions:
Most browsers support the clipboard, except Safari.
Support varies by browser, and some features are incomplete or have issues.
Events must be initiated by the user, such as clicking the mouse or pressing the keyboard. The script does not have free access to the clipboard.
document.execCommand()
This method is the key to implementing the clipboard. It can pass in three parameters: cut, copy, and paste. . Let’s start with the most commonly used document.execCommand('copy')
.
Before using, we should check whether the browser supports the copy command: document.queryCommandSupported('copy');
or document.queryCommandEnabled('copy');
, these two methods have the same effect.
But under Chrome, although Chrome does support the use of copy naming, both methods return false. So it's better to wrap the checking code in a try-catch block.
Next step, what should we allow users to copy? Text must be highlighted, and all browsers can use the select() method to select text within text input and textarea. At the same time, Firefox and Chrome/Opera also support the document.createRange
method, which allows selecting text from any element, as follows:
1 2 3 4 5 6 |
|
but IE/Edge does not support it.
clipboard.js
If you don’t want to implement a more robust cross-browser clipboard method yourself, clipboard.js can help you. It has several ways to set options, such as H5's data attribute, setting binding trigger elements and target elements, such as:
1 2 |
|
Do it yourself
clipboard The .js size is only 2Kb. If only some of the following functions are implemented, it can be implemented within 20 lines of code:
Only some form elements can be copied
If in an unsupported browser (yes, Safari), you can highlight the selected text and prompt the user to press Ctrl/Cmd C.
Like clipboard.js, first create a button to trigger the method, which has a data attribute data-copytarget, pointing to the element to be copied (i.e. #website)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 |
|
Example
Although in the above example, including the code for styles and animations, the code has exceeded 20 lines, animations and styles are optional.
Summary:
Select the content of the form element to be copied through .select()
Call document.execCommand( "copy") method
Call the .blur() method to remove focus from the form element
Include steps 2 and 3 In the try catch block, if the browser does not support it, it will prompt
Other methods
There are many novel clipboard application methods. For example, Trello.com, when hovering over a card, you can press Ctrl / Cmd C
and copy the card's link address to your clipboard. The implementation behind it is to first create a hidden form element containing the URL, then select and copy its content. Very clever and useful - I suspect very few users know about this feature!
The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.
Related articles:
How to implement a circular Nodelist Dom list using JS
How to implement text color change after clicking in Vue
How to set the background color for a separate page in Vue-cli
The above is the detailed content of How to implement pasteboard copy function using JS. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

How to use JS and Baidu Map to implement map pan function Baidu Map is a widely used map service platform, which is often used in web development to display geographical information, positioning and other functions. This article will introduce how to use JS and Baidu Map API to implement the map pan function, and provide specific code examples. 1. Preparation Before using Baidu Map API, you first need to apply for a developer account on Baidu Map Open Platform (http://lbsyun.baidu.com/) and create an application. Creation completed

Essential tools for stock analysis: Learn the steps to draw candle charts in PHP and JS. Specific code examples are required. With the rapid development of the Internet and technology, stock trading has become one of the important ways for many investors. Stock analysis is an important part of investor decision-making, and candle charts are widely used in technical analysis. Learning how to draw candle charts using PHP and JS will provide investors with more intuitive information to help them make better decisions. A candlestick chart is a technical chart that displays stock prices in the form of candlesticks. It shows the stock price

Face detection and recognition technology is already a relatively mature and widely used technology. Currently, the most widely used Internet application language is JS. Implementing face detection and recognition on the Web front-end has advantages and disadvantages compared to back-end face recognition. Advantages include reducing network interaction and real-time recognition, which greatly shortens user waiting time and improves user experience; disadvantages include: being limited by model size, the accuracy is also limited. How to use js to implement face detection on the web? In order to implement face recognition on the Web, you need to be familiar with related programming languages and technologies, such as JavaScript, HTML, CSS, WebRTC, etc. At the same time, you also need to master relevant computer vision and artificial intelligence technologies. It is worth noting that due to the design of the Web side

With the rapid development of Internet finance, stock investment has become the choice of more and more people. In stock trading, candle charts are a commonly used technical analysis method. It can show the changing trend of stock prices and help investors make more accurate decisions. This article will introduce the development skills of PHP and JS, lead readers to understand how to draw stock candle charts, and provide specific code examples. 1. Understanding Stock Candle Charts Before introducing how to draw stock candle charts, we first need to understand what a candle chart is. Candlestick charts were developed by the Japanese

How to use PHP and JS to create a stock candle chart. A stock candle chart is a common technical analysis graphic in the stock market. It helps investors understand stocks more intuitively by drawing data such as the opening price, closing price, highest price and lowest price of the stock. price fluctuations. This article will teach you how to create stock candle charts using PHP and JS, with specific code examples. 1. Preparation Before starting, we need to prepare the following environment: 1. A server running PHP 2. A browser that supports HTML5 and Canvas 3

How to use JS and Baidu Maps to implement map polygon drawing function. In modern web development, map applications have become one of the common functions. Drawing polygons on the map can help us mark specific areas for users to view and analyze. This article will introduce how to use JS and Baidu Map API to implement map polygon drawing function, and provide specific code examples. First, we need to introduce Baidu Map API. You can use the following code to import the JavaScript of Baidu Map API in an HTML file

Overview of how to use JS and Baidu Maps to implement map click event processing: In web development, it is often necessary to use map functions to display geographical location and geographical information. Click event processing on the map is a commonly used and important part of the map function. This article will introduce how to use JS and Baidu Map API to implement the click event processing function of the map, and give specific code examples. Steps: Import the API file of Baidu Map. First, import the file of Baidu Map API in the HTML file. This can be achieved through the following code:

How to use JS and Baidu Maps to implement the map heat map function Introduction: With the rapid development of the Internet and mobile devices, maps have become a common application scenario. As a visual display method, heat maps can help us understand the distribution of data more intuitively. This article will introduce how to use JS and Baidu Map API to implement the map heat map function, and provide specific code examples. Preparation work: Before starting, you need to prepare the following items: a Baidu developer account, create an application, and obtain the corresponding AP
