如何让PyQt5中QWebEngineView与JavaScript交互

2023-07-13 18:13:04 73

准备工作

开发环境

Python3.8.1
Windows10

安装依赖

pipinstallPyQt5
pipinstallPyQtWebEngine

Python端

1.使用QWebChannel的registerObject（"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

@QtCore.pyqtSlot(str)
deflog(self,message):
print(message)

出参

@QtCore.pyqtSlot(result=str)
defgetName(self):
return"hello"

出入参

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

JavaScript端

在Html的中添加

调用

newQWebChannel(qt.webChannelTransport,function(channel){
channel.objects.pythonBridge.test("hello",function(arg){
console.log("Pythonmessage:"+arg);
alert(arg);
});
});

调试(ChromeDevTools)

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

Demo

Python

1.JsBridge

fromPyQt5importQtCore

classJsBridge(QtCore.QObject):
@QtCore.pyqtSlot(str,result=str)
deftest(self,message):
print(message)
return"ok"

2.Application

fromPyQt5importQtCore
fromPyQt5importQtWebEngineWidgets
fromPyQt5.QtCoreimportQDir
fromPyQt5.QtWebChannelimportQWebChannel
fromPyQt5.QtWebEngineWidgetsimportQWebEngineView
fromPyQt5.QtWidgetsimport*

classTestWindow(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






Test




test

本文作者：liaoheng
本文链接：https://liaoheng.me/2019/12/23/PyQt5-QWebEngineView与JavaScript交互/

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如何让PyQt5中QWebEngineView与JavaScript交互

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