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docs: add Synchronous Messages Fiddle example (#20451)

* docs: add Synchronous Messages Fiddle example

* Code review changes

* Add OS support info
Amarnath Karthi 5 years ago
parent
dcf6f046d9
commit
0fe718b1d9
3 changed files with 65 additions and 0 deletions
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  1. 27 0
      docs/fiddles/communication/two-processes/synchronous-messages/index.html
  2. 29 0
      docs/fiddles/communication/two-processes/synchronous-messages/main.js
  3. 9 0
      docs/fiddles/communication/two-processes/synchronous-messages/renderer.js

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docs/fiddles/communication/two-processes/synchronous-messages/index.html
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+<!DOCTYPE html>
 
+<html>
 
+  <head>
 
+    <meta charset="UTF-8">
 
+  </head>
 
+  <body>
 
+    <div>
 
+      <div>
 
+        <h1>Synchronous messages</h1>
 
+        <i>Supports: Win, macOS, Linux <span>|</span> Process: Both</i>
 
+        <div>
 
+          <div>
 
+            <button id="sync-msg">Ping</button>
 
+            <span id="sync-reply"></span>
 
+          </div>
 
+          <p>You can use the <code>ipc</code> module to send synchronous messages between processes as well, but note that the synchronous nature of this method means that it <b>will block</b> other operations while completing its task.</p>
 
+          
+          <p>This example sends a synchronous message, "ping", from this process (renderer) to the main process. The main process then replies with "pong".</p>
 
+        </div>
 
+      </div>
 
+    </div>
 
+    <script>
 
+      // You can also require other files to run in this process
 
+      require('./renderer.js')
 
+    </script>
 
+  </body>
 
+</html>

+ 29 - 0
docs/fiddles/communication/two-processes/synchronous-messages/main.js
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+const { app, BrowserWindow, ipcMain } = require('electron')
 
+
 
+let mainWindow = null
 
+
 
+function createWindow () {
 
+  const windowOptions = {
 
+    width: 600,
 
+    height: 400,
 
+    title: 'Synchronous Messages',
 
+    webPreferences: {
 
+      nodeIntegration: true
 
+    }
 
+  }
 
+
 
+  mainWindow = new BrowserWindow(windowOptions)
 
+  mainWindow.loadFile('index.html')
 
+
 
+  mainWindow.on('closed', () => {
 
+    mainWindow = null
 
+  })
 
+}
 
+
 
+app.on('ready', () => {
 
+  createWindow()
 
+})
 
+
 
+ipcMain.on('synchronous-message', (event, arg) => {
 
+    event.returnValue = 'pong'
 
+})

+ 9 - 0
docs/fiddles/communication/two-processes/synchronous-messages/renderer.js
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+const { ipcRenderer } = require('electron')
 
+
 
+const syncMsgBtn = document.getElementById('sync-msg')
 
+
 
+syncMsgBtn.addEventListener('click', () => {
 
+    const reply = ipcRenderer.sendSync('synchronous-message', 'ping')
 
+    const message = `Synchronous message reply: ${reply}`
 
+    document.getElementById('sync-reply').innerHTML = message
 
+})