如何在pyqt5 qwebengineview中更改html的一部分

Question

我在 qwebengineview.setHtml() 中查看了一些 html 现在我想运行单击 html 中的按钮时的 python 函数查看，然后将一些 html 添加到我的 html 视图，这是我调用的函数的输出。具体来说：我希望在按下表单按钮时删除输入。

我已阅读此，但它没有告诉我如何在我的 html 中进行更改或更改其中的一部分或附加到它。
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

如果你想从 HTML 中删除一个元素，你必须用 js 来做，但主要的问题是知道什么时候做，如果是表单，页面会重新加载，所以你必须删除在为它加载后的瞬间，“输入”可以使用带有适当 "t" 的 QTimer.singleShot (t, func)。

考虑到上述情况并使用相同的代码，那么解决方案是

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)
        <b>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");
        """
        )</b>

如何在pyqt5 qwebengineview中更改html的一部分

how to change a part of html in pyqt5 qwebengineview

python

python-3.x

pyqt

pyqt5

qwebengineview