クロスプラットフォームなアプリ作成ツール「Electron」で遊ぶ　その２：webview導入編

webviewは……簡単にいうとElectronのインラインブラウザーです。
electron.atom.io

実際のところ

前回のスクリプトを基準に
***main.js

'use strict';
const electron = require('electron');
const app = electron.app;  // Module to control application life.
const BrowserWindow = electron.BrowserWindow;  // Module to create native browser window.

// Report crashes to our server.
electron.crashReporter.start();

// Keep a global reference of the window object, if you don't, the window will
// be closed automatically when the JavaScript object is garbage collected.
let mainWindow;

// Quit when all windows are closed.
app.on('window-all-closed', function() {
  // On OS X it is common for applications and their menu bar
  // to stay active until the user quits explicitly with Cmd + Q
  if (process.platform != 'darwin') {
    app.quit();
  }
});

// This method will be called when Electron has finished
// initialization and is ready to create browser windows.
app.on('ready', function() {
  // Create the browser window.
    mainWindow = new BrowserWindow({width: 640, height: 480});
    mainWindow.loadURL(`file://${__dirname}/index.html`);
		       
  // Emitted when the window is closed.
  mainWindow.on('closed', function() {
    // Dereference the window object, usually you would store windows
    // in an array if your app supports multi windows, this is the time
    // when you should delete the corresponding element.
    mainWindow = null;
  });
});

index.html

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <title>Hello World!</title>
  </head>
  <body>
    <script>
      onload = function() {
      var webview = document.getElementById("foo");
      var indicator = document.querySelector(".indicator");

      var loadstart = function() {
      indicator.innerText = "loading...";
      }
      var loadstop = function() {
      indicator.innerText = "";
      }
      webview.addEventListener("did-start-loading", loadstart);
      webview.addEventListener("did-stop-loading", loadstop);
      }
      </script>
    <webview id="foo" src="https://duckduckgo.com/" style="display:inline-block; width:320px; height:240px">...loading</webview>
    <form>
      <input type="button" value="Green" onClick="document.bgColor='green'">
    </form>
  </body>
</html>

見え方

duckduckgoを表示しています。*1
試しに検索ワードを突っ込むと、ちゃんと動いてるのが確認できます。
f:id:shuzo_kino:20151214234458p:plain
検索結果もこの通り。
f:id:shuzo_kino:20151214234619p:plain
ただし、何もしなければ「戻る」ボタンすらないため実装が必要です。
実際にはWEBページなりjsonなりをレンダリングする機能として使うもののようです。