從 pyqt QWebEngineView 啟動 javascript 函數

Question

我打算從 pyqt QWebEngine 執行一個 javascript 函數。 我遵循了一個使用地圖的示例，並在按下 Qt 應用程序按鈕時檢索了地圖綁定，並編寫了一個小示例。

html：

<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
</head>

<body>

<script>
    function helloWorld(param1, param2) {
        return "Hello world " + param1 + " " + param2;
    }
</script>

</body>
</html>

Python：

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QVBoxLayout, QWidget
from PyQt5.QtWebEngineWidgets import QWebEngineView


class MainWindow(QMainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        self.form_widget = FormWidget(self)
        _widget = QWidget()
        _layout = QVBoxLayout(_widget)
        _layout.addWidget(self.form_widget)
        self.setCentralWidget(_widget)


class FormWidget(QWidget):
    def __init__(self, parent):
        super(FormWidget, self).__init__(parent)
        self.__controls()
        self.__layout()
        self.browser.page().runJavaScript("helloWorld()", self.ready)

    def __controls(self):
        html = open('test.html', 'r').read()
        self.browser = QWebEngineView()
        self.browser.setHtml(html)

    def __layout(self):
        self.vbox = QVBoxLayout()
        self.hBox = QVBoxLayout()
        self.hBox.addWidget(self.browser)
        self.vbox.addLayout(self.hBox)
        self.setLayout(self.vbox)

    def ready(self, returnValue):
        print(returnValue)

def main():
    app = QApplication(sys.argv)
    win = MainWindow()
    win.show()
    app.exec_()


if __name__ == '__main__':
    sys.exit(main())

不過，我收到以下錯誤：

js: Uncaught ReferenceError: helloWorld is not defined
None ----> This is the return value printed at ready()

我錯過了什么？

Answer 1

你有2個錯誤：

當頁面尚未完成加載時，您正在調用該函數。
您的函數需要 2 個參數，雖然它也可以工作，但會發出undefined信號。

使用上述內容，您將獲得以下內容：

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QVBoxLayout, QWidget
from PyQt5.QtWebEngineWidgets import QWebEngineView


class MainWindow(QMainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        self.form_widget = FormWidget(self)
        _widget = QWidget()
        _layout = QVBoxLayout(_widget)
        _layout.addWidget(self.form_widget)
        self.setCentralWidget(_widget)


class FormWidget(QWidget):
    def __init__(self, parent):
        super(FormWidget, self).__init__(parent)
        self.__controls()
        self.__layout()

    def __controls(self):
        html = open('test.html', 'r').read()
        self.browser = QWebEngineView()
        self.browser.setHtml(html)
        self.browser.loadFinished.connect(self.onLoadFinished)

    def onLoadFinished(self, ok):
        if ok:
            self.browser.page().runJavaScript("helloWorld(1, \"2\")", self.ready)

    def __layout(self):
        self.vbox = QVBoxLayout()
        self.hBox = QVBoxLayout()
        self.hBox.addWidget(self.browser)
        self.vbox.addLayout(self.hBox)
        self.setLayout(self.vbox)

    def ready(self, returnValue):
        print(returnValue)

def main():
    app = QApplication(sys.argv)
    win = MainWindow()
    win.show()
    return app.exec_()


if __name__ == '__main__':
    sys.exit(main())

加：

要可視化 js 控制台的輸出，您必須覆蓋QWebEnginePage的javaScriptConsoleMessage方法：

...
class WebEnginePage(QWebEnginePage):
    def javaScriptConsoleMessage(self, level, message, lineNumber, sourceID):
        print("javaScriptConsoleMessage: ", level, message, lineNumber, sourceID)


class FormWidget(QWidget):
    ...
    def __controls(self):
        ...
        self.browser = QWebEngineView()
        self.browser.setPage(WebEnginePage(self.browser))
        ...

要驗證這一點，您必須使用console.log(...) ：

*.html

...
<script>
    function helloWorld(param1, param2) {
        console.log("Hello world")
        return "Hello world " + param1 + " " + param2;
    }
</script>
...

輸出：

javaScriptConsoleMessage:  0 Hello world 12 data:text/html;charset=UTF-8,%3C%21DOCTYPE%20html%3E%0A%3Chtml%3E%0A%0A%3Chead%3E%0A%20%20%20%20%3Cmeta%20charset%3D%22UTF-8%22%3E%0A%3C%2Fhead%3E%0A%0A%3Cbody%3E%0A%0A%3Cscript%3E%0A%20%20%20%20function%20helloWorld%28param1%2C%20param2%29%20%7B%0A%20%20%20%20%09console.log%28%22Hello%20world%22%29%0A%20%20%20%20%20%20%20%20return%20%22Hello%20world%20%22%20%2B%20param1%20%2B%20%22%20%22%20%2B%20param2%3B%0A%20%20%20%20%7D%0A%3C%2Fscript%3E%0A%0A%3C%2Fbody%3E%0A%3C%2Fhtml%3E

從 pyqt QWebEngineView 啟動 javascript 函數

問題描述

1 個解決方案

解決方案1
8 已采納 2018-08-30 15:10:51

從 pyqt QWebEngineView 啟動 javascript 函數

問題描述

1 個解決方案

解決方案1 8 已采納 2018-08-30 15:10:51

解決方案1
8 已采納 2018-08-30 15:10:51