我不熟悉javascriptand QWebEnginePage。当我设置self.content.setText('text')内容时，QWebEngineView内容没有改变？蟒蛇代码class Document(QObject): textChanged = pyqtSignal(str) def __init__(self): super().__init__() self.text = '' def setText(self, text): self.text = text self.textChanged.emit(text) print('emit')class Demo(QWebEngineView): def __init__(self): super().__init__() self.content = Document() page = self.page() channel = QWebChannel() channel.registerObject('content', self.content) page.setWebChannel(channel) with open('index.html') as f: self.setHtml(f.read()) self.content.setText('text')app = QApplication([])demo = Demo()demo.resize(500, 400)demo.show()app.exec()索引html：<!doctype html><html><meta charset="utf-8"><head> <script src="qwebchannel.js"></script></head><body><div id="placeholder">22</div><script> 'use strict'; var placeholder = document.getElementById('placeholder'); var updateText = function (text) { placeholder.innerHTML = text; console.log(text); } new QWebChannel(qt.webChannelTransport, function (channel) { var content = channel.objects.content; updateText(content.text); content.textChanged.connect(updateText); } );</script></body></html>
1 回答
千万里不及你
TA贡献1784条经验 获得超9个赞
您有以下错误：
channel 是一个局部变量，一旦“Demo”构造函数完成就会被移除，它是 Python 和 Javascript 通信的中介。解决方案是通过将其传递给父类（Qt 样式）或使其成为类的属性来延长生命周期。
在 .html 中，您试图包含 qwebchannel.js 但通常您应该使用
<script src="qrc:///qtwebchannel/qwebchannel.js"></script>.如果您将 QObject 导出到 javascript，那么只有 Q-Properties、QSlot 和 QSignals 将被导出，因为 QWebChannel 使用 QMetaObject instropection，但“文本”都不是它们，因此它在 javascript 中将是未定义的。解决方案是将其作为 pyqtProperty 公开。
import os
from PyQt5.QtCore import pyqtProperty, pyqtSignal, QObject, QUrl
from PyQt5.QtWidgets import QApplication
from PyQt5.QtWebEngineWidgets import QWebEngineView
from PyQt5.QtWebChannel import QWebChannel
CURRENT_DIR = os.path.dirname(os.path.realpath(__file__))
class Document(QObject):
textChanged = pyqtSignal(str)
def __init__(self):
super().__init__()
self._text = ""
def text(self):
return self._text
def setText(self, text):
self._text = text
self.textChanged.emit(text)
print("emit")
text = pyqtProperty(str, fget=text, fset=setText, notify=textChanged)
class Demo(QWebEngineView):
def __init__(self):
super().__init__()
self.content = Document()
channel = QWebChannel(self)
channel.registerObject("content", self.content)
self.page().setWebChannel(channel)
filename = os.path.join(CURRENT_DIR, "index.html")
self.load(QUrl.fromLocalFile(filename))
self.content.setText("text")
def main():
app = QApplication([])
demo = Demo()
demo.resize(500, 400)
demo.show()
app.exec()
if __name__ == "__main__":
main()
<!doctype html>
<html>
<meta charset="utf-8">
<head>
<script src="qrc:///qtwebchannel/qwebchannel.js"></script>
</head>
<body>
<div id="placeholder">22</div>
<script>
'use strict';
var placeholder = document.getElementById('placeholder');
var updateText = function (text) {
placeholder.innerHTML = text;
console.log(text);
}
new QWebChannel(qt.webChannelTransport,
function (channel) {
var content = channel.objects.content;
updateText(content.text);
content.textChanged.connect(updateText);
}
);
</script>
</body>
</html>
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