Question

我已经在qwebengineview.setHtml（）中查看了一些html，现在我想在该html视图中单击按钮时运行一个python函数，然后将一些html添加到我的html视图中，这是该函数的输出我打电话了。具体来说：我希望在按下表单按钮时希望删除输入。

我已阅读过此question，但它没有告诉我如何在html中进行更改，更改其一部分或附加到其上。
示例：

import os
import sys
from PyQt5 import QtCore, QtWidgets, QtWebEngineWidgets, QtWebChannel
from jinja2 import Template


class Element(QtCore.QObject):
    def __init__(self, name, parent=None):
        super(Element, self).__init__(parent)
        self._name = name

    @property
    def name(self):
        return self._name

    def script(self):
        raise NotImplementedError


class FormObject(Element):
    numbersChanged = QtCore.pyqtSignal(str, str)

    def script(self):
        _script = r"""
        var btn = document.getElementById('sub1');
        btn.addEventListener("click", function(event){
            var number1 = document.getElementById('num1');
            var number2 = document.getElementById('num2');
            {{name}}.update(number1.value , number2.value);
        });
        """
        return Template(_script).render(name=self.name)

    @QtCore.pyqtSlot(str, str)
    def update(self, number1, number2):
        self.numbersChanged.emit(number1, number2)


class WebEnginePage(QtWebEngineWidgets.QWebEnginePage):
    def __init__(self, *args, **kwargs):
        super(WebEnginePage, self).__init__(*args, **kwargs)
        self.loadFinished.connect(self.onLoadFinished)
        self._objects = []

    def add_object(self, obj):
        self._objects.append(obj)

    @QtCore.pyqtSlot(bool)
    def onLoadFinished(self, ok):
        if ok:
            self.load_qwebchannel()
            self.load_objects()

    def load_qwebchannel(self):
        file = QtCore.QFile(":/qtwebchannel/qwebchannel.js")
        if file.open(QtCore.QIODevice.ReadOnly):
            content = file.readAll()
            file.close()
            self.runJavaScript(content.data().decode())
        if self.webChannel() is None:
            channel = QtWebChannel.QWebChannel(self)
            self.setWebChannel(channel)

    def load_objects(self):
        if self.webChannel() is not None:
            objects = {obj.name: obj for obj in self._objects}
            self.webChannel().registerObjects(objects)
            _script = r"""
            {% for obj in objects %}
            var {{obj}};
            {% endfor %}
            new QWebChannel(qt.webChannelTransport, function (channel) {
            {% for obj in objects %}
                {{obj}} = channel.objects.{{obj}};
            {% endfor %}
            });
            """
            self.runJavaScript(Template(_script).render(objects=objects.keys()))
            for obj in self._objects:
                if isinstance(obj, Element):
                    self.runJavaScript(obj.script())


class WebPage(QtWebEngineWidgets.QWebEngineView):
    def __init__(self, parent=None):
        super().__init__(parent)

        page = WebEnginePage(self)
        self.setPage(page)

        formobject = FormObject("formobject", self)
        formobject.numbersChanged.connect(self.on_numbersChanged)
        page.add_object(formobject)

        filepath = os.path.abspath(
            os.path.join(os.path.dirname(__file__), "new.html")
        )
        self.load(QtCore.QUrl.fromLocalFile(filepath))

    @QtCore.pyqtSlot(str, str)
    def on_numbersChanged(self, number1, number2):
        print(number1, number2)


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    web = WebPage()
    web.show()
    sys.exit(app.exec_())

<!DOCTYPE <html>
    <body>
        <form>
            Number 1:<input type="text" id="num1">
            <br>
            Number 2:<input type="text" id="num2">
            <br>
            <input type="submit" id="sub1">
        </form>
    </body>
</html>

Answer 1

如果要从HTML中删除元素，则必须使用js来完成，但是主要的问题是知道何时执行此操作（如果是表单，则页面会重新加载），因此必须立即删除“输入”为其加载后，可以使用带有适当“ t”的QTimer.singleShot（t，func）。

考虑以上内容并使用相同的代码，则解决方案是

class WebPage(QtWebEngineWidgets.QWebEngineView):
    def __init__(self, parent=None):
        super().__init__(parent)

        page = WebEnginePage(self)
        self.setPage(page)

        formobject = FormObject("formobject", self)
        formobject.numbersChanged.connect(self.on_numbersChanged)
        page.add_object(formobject)

        filepath = os.path.abspath(
            os.path.join(os.path.dirname(__file__), "new.html")
        )
        self.load(QtCore.QUrl.fromLocalFile(filepath))

    @QtCore.pyqtSlot(str, str)
    def on_numbersChanged(self, number1, number2):
        print(number1, number2)
        QtCore.QTimer.singleShot(100, self.remove_inputs)

    def remove_inputs(self):
        self.page().runJavaScript(
            """
            function remove_by_id(_id){
                var elem = document.getElementById(_id);
                elem.parentNode.removeChild(elem);
            }
            remove_by_id("num1");
            remove_by_id("num2");
        """
        )

如何在pyqt5 qwebengineview中更改html的一部分

1 个答案: