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PyQt5中QWebEngineView与JavaScript交互

准备工作

开发环境

  • Python 3.8.1
  • Windows 10

安装依赖

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pip install PyQt5
pip install PyQtWebEngine

Python端

  1. 使用QWebChannelregisterObject("JsBridge名","JsBridge")方法注册回调

    • JsBridge名:在JavaScript中调用时使用的对象名称
    • JsBridge:被JavaScript调用的Python对象
  2. JsBridge 对象

    • 入参

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      @QtCore.pyqtSlot(str)
      def log(self, message):
      print(message)
    • 出参

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      @QtCore.pyqtSlot(result=str)
      def getName(self):
      return "hello"
    • 出入参

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      @QtCore.pyqtSlot(str, result=str)
      def test(self, message):
      print(message)
      return "ok"

JavaScript端

  1. 在Html的<head>中添加

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    <script src='qrc:///qtwebchannel/qwebchannel.js'></script>
  2. 调用

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    new QWebChannel(qt.webChannelTransport, function(channel) {
    channel.objects.pythonBridge.test("hello",function(arg) {
    console.log("Python message: " + arg);
    alert(arg);
    });
    });
  3. 调试(Chrome DevTools)

    1. 配置环境变量:QTWEBENGINE_REMOTE_DEBUGGING = port
    2. 使用Chromium内核的浏览器打开地址:http://127.0.0.1:port
    3. 使用PyCharm中可以在运行配置(Run/Debug Configurations)中的Environment variables中添加环境变量,用;号分隔,然后可以直接运行。

Demo

Python

  1. JsBridge

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    from PyQt5 import QtCore

    class JsBridge(QtCore.QObject):
    @QtCore.pyqtSlot(str, result=str)
    def test(self, message):
    print(message)
    return "ok"
  2. Application
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    from PyQt5 import QtCore
    from PyQt5 import QtWebEngineWidgets
    from PyQt5.QtCore import QDir
    from PyQt5.QtWebChannel import QWebChannel
    from PyQt5.QtWebEngineWidgets import QWebEngineView
    from PyQt5.QtWidgets import *

    class TestWindow(QMainWindow):
    def __init__(self):
    super().__init__()
    self.webView = QWebEngineView()
    self.webView.settings().setAttribute(
    QtWebEngineWidgets.QWebEngineSettings.JavascriptEnabled, True)

    channel = QWebChannel(self.webView.page())
    self.webView.page().setWebChannel(channel)
    self.python_bridge = JsBridge(None)
    channel.registerObject("pythonBridge", self.python_bridge)
    layout = QVBoxLayout()
    layout.addWidget(self.webView)
    widget = QWidget()
    widget.setLayout(layout)
    self.setCentralWidget(widget)

    self.resize(900, 600)
    self.setWindowTitle('Test')
    qr = self.frameGeometry()
    cp = QDesktopWidget().availableGeometry().center()
    qr.moveCenter(cp)
    self.move(qr.topLeft())
    self.show()
    html_path = QtCore.QUrl.fromLocalFile(QDir.currentPath() + "/assets/index.html")
    self.webView.load(html_path)

    if __name__ == '__main__':
    app = QApplication(sys.argv)
    m = TestWindow()
    sys.exit(app.exec_())

JavaScript

index.html
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<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
<title>Test</title>
<script src='qrc:///qtwebchannel/qwebchannel.js'></script>
<script src="https://code.jquery.com/jquery-3.4.1.min.js"
integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo="
crossorigin="anonymous"></script>
</head>
<body>
<button id="test">test</button>
</body>
<script>
$(document).ready(function() {
new QWebChannel(qt.webChannelTransport, function(channel) {
$('#test').on('click', function() {
channel.objects.pythonBridge.test("hello",function(arg) {
console.log("Python message: " + arg);
alert(arg);
});
});
});
});
</script>
</html>