我正在尝试,使用 Qt 类QWebEngineView
, and QWebChannel
在 HTML 页面和 Python 脚本之间建立简单的连接。目标只是执行foo()
当标题<h2>
被点击。
import sys
from PyQt5.QtCore import pyqtSlot
from PyQt5.QtWidgets import QApplication
from PyQt5.QtWebChannel import QWebChannel
from PyQt5.QtWebEngineWidgets import QWebEngineView, QWebEnginePage
html = '''
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<script src="qrc:///qtwebchannel/qwebchannel.js"></script>
<script>
var backend;
new QWebChannel(qt.webChannelTransport, function (channel) {
backend = channel.objects.backend;
});
document.getElementById("header").addEventListener("click", function(){
backend.foo();
});
</script>
</head>
<body> <h2 id="header">Header.</h2> </body>
</html>
'''
class HelloWorldHtmlApp(QWebEngineView):
def __init__(self):
super().__init__()
# setup a page with my html
my_page = QWebEnginePage(self)
my_page.setHtml(html)
self.setPage(my_page)
# setup channel
self.channel = QWebChannel()
self.channel.registerObject('backend', self)
self.page().setWebChannel(self.channel)
self.show()
@pyqtSlot()
def foo(self):
print('bar')
if __name__ == "__main__":
app = QApplication.instance() or QApplication(sys.argv)
view = HelloWorldHtmlApp()
view.show()
app.exec_()
问题似乎是变量backend
is not visible之外的QWebChannel
构造函数。我试着做backend
的一个属性widnow
做到这一点global但它不起作用。
问题不在于可见性,而在于与点击事件的连接,文件的上传是从上到下的,因此您尝试在标头尚不存在时连接标头,解决方案是重写 HTML:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<script src="qrc:///qtwebchannel/qwebchannel.js"></script>
</head>
<body> <h2 id="header">Header.</h2> </body>
<script>
var backend;
new QWebChannel(qt.webChannelTransport, function (channel) {
backend = channel.objects.backend;
});
document.getElementById("header").addEventListener("click", function(){
backend.foo();
});
</script>
</html>
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