深度链接 (Deep Links)
概览
This guide will take you through the process of setting your Electron app as the default handler for a specific protocol.
通过此教程,您会掌握如何设置您的应用以拦截并处理任意特定协议的URL的点击事件。 在本指南中,我们假定这个协议名为“electron-fiddle://
”。
示例
主进程(main.js)
首先,我们需要从electron
导入所需的模块。 这些模块有助于控制应用的生命周期,或创建原生的浏览器窗口。
const { app, BrowserWindow, shell } = require('electron')
const path = require('node:path')
其次,我们将应用注册为“electron-fiddle://
”协议的处理器。
if (process.defaultApp) {
if (process.argv.length >= 2) {
app.setAsDefaultProtocolClient('electron-fiddle', process.execPath, [path.resolve(process.argv[1])])
}
} else {
app.setAsDefaultProtocolClient('electron-fiddle')
}
现在我们定义负责创建浏览器窗口的函数,并加载应用的 index.html
文件。
let mainWindow
const createWindow = () => {
// 创建浏览器窗口
mainWindow = new BrowserWindow({
width: 800,
height: 600,
webPreferences: {
preload: path.join(__dirname, 'preload.js')
}
})
mainWindow.loadFile('index.html')
}
紧接着,我们将创建 BrowserWindow
并在应用中定义如何处理此外部协议被点击的事件。
这段代码在 Windows 和 Linux 上会与 MacOS 有所不同。 这是因为这两个平台会触发 second-instance
事件,而不是 open-url
事件,而且 Windows 需要额外的代码才能在同一个 Electron 实例中打开协议链接的内容。 Read more about this here.
Windows 和 Linux 的代码示例:
const gotTheLock = app.requestSingleInstanceLock()
if (!gotTheLock) {
app.quit()
} else {
app.on('second-instance', (event, commandLine, workingDirectory) => {
// 用户正在尝试运行第二个实例,我们需要让焦点指向我们的窗口
if (mainWindow) {
if (mainWindow.isMinimized()) mainWindow.restore()
mainWindow.focus()
}
// 命令行是一个字符串数组,其中最后一个元素是深度链接的URL。
dialog.showErrorBox('Welcome Back', `You arrived from: ${commandLine.pop()}`)
})
// 创建主窗口,加载应用程序的其他部分,等等...
app.whenReady().then(() => {
createWindow()
})
}
MacOS 代码示例:
// Electron 在完成初始化,并准备创建浏览器窗口时,
// 会调用这个方法。
// 部分 API 在 ready 事件触发后才能使用。
app.whenReady().then(() => {
createWindow()
})
// 处理协议 在本例中,我们选择显示一个错误提示对话框。
app.on('open-url', (event, url) => {
dialog.showErrorBox('欢迎回来', `导向自: ${url}`)
})
最后,我们还需要处理应用的关闭事件。
// 在除 MacOS 的其他平台上,当所有窗口关闭后,退出当前应用。 在 MacOS 上,
// 应用及其菜单栏通常会保持活跃状态,
// 直到用户明确按下 Cmd + Q 退出应用
app.on('window-all-closed', () => {
if (process.platform !== 'darwin') app.quit()
})
重要提醒:
打包
在 macOS 和 Linux 上,此功能仅在应用打包后才有效。 在命令行启动的开发版中无效。 当您打包应用程序时,你需要确保应用程序的 macOS Info.plist
和 Linux .desktop
文件已更新以包含新的协议处理程序。 一些绑定和分发应用程序的 Electron 工具会自动为你处理
Electron Forge
If you're using Electron Forge, adjust packagerConfig
for macOS support, and the configuration for the appropriate Linux makers for Linux support, in your Forge configuration (please note the following example only shows the bare minimum needed to add the configuration changes):
{
"config": {
"forge": {
"packagerConfig": {
"protocols": [
{
"name": "Electron Fiddle",
"schemes": ["electron-fiddle"]
}
]
},
"makers": [
{
"name": "@electron-forge/maker-deb",
"config": {
"mimeType": ["x-scheme-handler/electron-fiddle"]
}
}
]
}
}
}
Electron Packager
对于 macOS 支持:
如果您正在使用 Electron Packager 的 API,添加对协议处理程序的支持类似于 Electron Forge 的处理方式, 其他 protocols
是传递到 packager
函数的 Packager 选项的一部分。
const packager = require('@electron/packager')
packager({
// ...other options...
protocols: [
{
name: 'Electron Fiddle',
schemes: ['electron-fiddle']
}
]
}).then(paths => console.log(`SUCCESS: Created ${paths.join(', ')}`))
.catch(err => console.error(`ERROR: ${err.message}`))
如果您使用 Electron Packager 的 CLI,请使用 --protocol
和 --protocol-name
标志。 例如:
npx electron-packager . --protocol=electron-fiddle --protocol-name="Electron Fiddle"
结论
启动 Electron 应用后,在浏览器内键入包含该自定义协议的 URL,如 "electron-fiddle://open"
,观察应用是否正确响应并显示一个错误提示对话框。
- main.js
- preload.js
- index.html
- renderer.js
// Modules to control application life and create native browser window
const { app, BrowserWindow, ipcMain, shell, dialog } = require('electron/main')
const path = require('node:path')
let mainWindow
if (process.defaultApp) {
if (process.argv.length >= 2) {
app.setAsDefaultProtocolClient('electron-fiddle', process.execPath, [path.resolve(process.argv[1])])
}
} else {
app.setAsDefaultProtocolClient('electron-fiddle')
}
const gotTheLock = app.requestSingleInstanceLock()
if (!gotTheLock) {
app.quit()
} else {
app.on('second-instance', (event, commandLine, workingDirectory) => {
// Someone tried to run a second instance, we should focus our window.
if (mainWindow) {
if (mainWindow.isMinimized()) mainWindow.restore()
mainWindow.focus()
}
dialog.showErrorBox('Welcome Back', `You arrived from: ${commandLine.pop().slice(0, -1)}`)
})
// Create mainWindow, load the rest of the app, etc...
app.whenReady().then(() => {
createWindow()
})
app.on('open-url', (event, url) => {
dialog.showErrorBox('Welcome Back', `You arrived from: ${url}`)
})
}
function createWindow () {
// Create the browser window.
mainWindow = new BrowserWindow({
width: 800,
height: 600,
webPreferences: {
preload: path.join(__dirname, 'preload.js')
}
})
mainWindow.loadFile('index.html')
}
// Quit when all windows are closed, except on macOS. There, it's common
// for applications and their menu bar to stay active until the user quits
// explicitly with Cmd + Q.
app.on('window-all-closed', function () {
if (process.platform !== 'darwin') app.quit()
})
// Handle window controls via IPC
ipcMain.on('shell:open', () => {
const pageDirectory = __dirname.replace('app.asar', 'app.asar.unpacked')
const pagePath = path.join('file://', pageDirectory, 'index.html')
shell.openExternal(pagePath)
})
const { contextBridge, ipcRenderer } = require('electron/renderer')
contextBridge.exposeInMainWorld('shell', {
open: () => ipcRenderer.send('shell:open')
})
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<!-- https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP -->
<meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self'">
<meta http-equiv="X-Content-Security-Policy" content="default-src 'self'; script-src 'self'">
<title>app.setAsDefaultProtocol Demo</title>
</head>
<body>
<h1>App Default Protocol Demo</h1>
<p>The protocol API allows us to register a custom protocol and intercept existing protocol requests.</p>
<p>These methods allow you to set and unset the protocols your app should be the default app for. Similar to when a
browser asks to be your default for viewing web pages.</p>
<p>Open the <a href="https://www.electronjs.org/docs/latest/api/protocol">full protocol API documentation</a> in your
browser.</p>
-----
<h3>Demo</h3>
<p>
First: Launch current page in browser
<button id="open-in-browser" class="js-container-target demo-toggle-button">
Click to Launch Browser
</button>
</p>
<p>
Then: Launch the app from a web link!
<a href="electron-fiddle://open">Click here to launch the app</a>
</p>
----
<p>You can set your app as the default app to open for a specific protocol. For instance, in this demo we set this app
as the default for <code>electron-fiddle://</code>. The demo button above will launch a page in your default
browser with a link. Click that link and it will re-launch this app.</p>
<h3>Packaging</h3>
<p>This feature will only work on macOS when your app is packaged. It will not work when you're launching it in
development from the command-line. When you package your app you'll need to make sure the macOS <code>plist</code>
for the app is updated to include the new protocol handler. If you're using <code>@electron/packager</code> then you
can add the flag <code>--extend-info</code> with a path to the <code>plist</code> you've created. The one for this
app is below:</p>
<p>
<h5>macOS plist</h5>
<pre><code>
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>CFBundleURLTypes</key>
<array>
<dict>
<key>CFBundleURLSchemes</key>
<array>
<string>electron-api-demos</string>
</array>
<key>CFBundleURLName</key>
<string>Electron API Demos Protocol</string>
</dict>
</array>
<key>ElectronTeamID</key>
<string>VEKTX9H2N7</string>
</dict>
</plist>
</code>
</pre>
<p>
<!-- You can also require other files to run in this process -->
<script src="./renderer.js"></script>
</body>
</html>
// This file is required by the index.html file and will
// be executed in the renderer process for that window.
// All APIs exposed by the context bridge are available here.
// Binds the buttons to the context bridge API.
document.getElementById('open-in-browser').addEventListener('click', () => {
window.shell.open()
})