PyQt5 使用 runJavaScript 检索表单值 [英] PyQt5 retrieve form values using runJavaScript

问题描述

我有一个 form.html 文件，我使用 PyQt5 QWebEngineView 运行它.我想在单击提交按钮后检索表单值.我经历了许多解决方案，但找不到完美的解决方案.例如:我找到了这个，但它适用于URL Change.

我只是在寻找一种可以点击提交按钮的解决方案.

这是我从上面的链接中使用的代码，但我没有从表单返回任何值:

导入操作系统导入系统从 PyQt5.QtWidgets 导入 QApplication、QVBoxLayout、QWidget从 PyQt5.QtCore 导入 QUrl, QEventLoop从 PyQt5.QtWebEngineWidgets 导入 QWebEngineView从 PyQt5.QtWebEngineCore 导入 QWebEngineUrlRequestInterceptor类网页(QWebEngineView):def __init__(self):QWebEngineView.__init__(self)文件路径 = os.path.abspath(os.path.join(os.path.dirname(__file__), 'form.html'))self.load(QUrl.fromLocalFile(filepath))self.loadFinished.connect(self._on_load_finished)def _on_load_finished(self):self.page().runJavaScript("document.getElementById('num1').value", self.store_value)def store_value(self, param):self.value = 参数打印(参数:" +str(参数))如果 __name__ == "__main__":app = QApplication(sys.argv)网页 = 网页()网络秀()sys.exit(app.exec_())

HTML:

<身体><表格>数字 1:<br>数字 2:<br><input type="submit" id="sub1"></表单>

解决方案

基于我在 我的旧答案中使用的策略，解决办法是通过QWebChannel注入一个QObject，并在其中绑定按钮点击事件来更新一个slot.在这种情况下，我使用 Jinja2 来简化脚本的编写.

import os导入系统从 PyQt5 导入 QtCore、QtWidgets、QtWebEngineWidgets、QtWebChannel从 jinja2 导入模板类元素(QtCore.QObject):def __init__(self, name, parent=None):super(Element, self).__init__(parent)self._name = 姓名@财产定义名称(自己):返回 self._name定义脚本(自我):引发 NotImplementedError类 FormObject(Element):numbersChanged = QtCore.pyqtSignal(str, str)定义脚本(自我):_script = r"""var btn = document.getElementById('sub1');btn.addEventListener("点击", function(event){var number1 = document.getElementById('num1');var number2 = document.getElementById('num2');{{name}}.update(number1.value, number2.value);});"""返回模板(_script).render(name=self.name)@QtCore.pyqtSlot(str, str)定义更新(自我，编号1，编号2):self.numbersChanged.emit(number1, number2)类 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):如果没问题:self.load_qwebchannel()self.load_objects()def load_qwebchannel(self):file = QtCore.QFile(":/qtwebchannel/qwebchannel.js")如果 file.open(QtCore.QIODevice.ReadOnly):内容 = file.readAll()文件.close()self.runJavaScript(content.data().decode())如果 self.webChannel() 是 None:频道 = QtWebChannel.QWebChannel(self)self.setWebChannel(频道)def load_objects(self):如果 self.webChannel() 不是 None:objects = {obj.name: obj for obj in self._objects}self.webChannel().registerObjects(objects)_script = r"""{% for obj in objects %}var {{obj}};{% 结束为 %}新 QWebChannel(qt.webChannelTransport, 函数 (channel) {{% for obj in objects %}{{obj}} = channel.objects.{{obj}};{% 结束为 %}});"""self.runJavaScript(Template(_script).render(objects=objects.keys()))对于 self._objects 中的 obj:如果是实例(对象，元素):self.runJavaScript(obj.script())类网页(QtWebEngineWidgets.QWebEngineView):def __init__(self, parent=None):super().__init__(parent)页面 = WebEnginePage(self)self.setPage(页面)formobject = FormObject("formobject", self)formobject.numbersChanged.connect(self.on_numbersChanged)page.add_object(formobject)文件路径 = os.path.abspath(os.path.join(os.path.dirname(__file__), "form.html"))self.load(QtCore.QUrl.fromLocalFile(filepath))@QtCore.pyqtSlot(str, str)def on_numbersChanged(self, number1, number2):打印(编号1，编号2)如果 __name__ == "__main__":app = QtWidgets.QApplication(sys.argv)网页 = 网页()网络秀()sys.exit(app.exec_())

I have a form.html file and i run it using PyQt5 QWebEngineView. I want to retrieve form values after the Submit button is clicked. I've gone through many solutions but cannot find the perfect one. Eg: I found this one but it works on URL Change.

I'm just simply looking for a solution which works on clicking the Submit button.

Here's my code that i have used from the above link but i'm not getting any value returned from the form:

import os
import sys
from PyQt5.QtWidgets import QApplication, QVBoxLayout, QWidget
from PyQt5.QtCore import QUrl, QEventLoop
from PyQt5.QtWebEngineWidgets import QWebEngineView
from PyQt5.QtWebEngineCore import QWebEngineUrlRequestInterceptor

class WebPage(QWebEngineView):
    def __init__(self):
        QWebEngineView.__init__(self)
        filepath = os.path.abspath(os.path.join(os.path.dirname(__file__), 'form.html'))
        self.load(QUrl.fromLocalFile(filepath))
        self.loadFinished.connect(self._on_load_finished)

    def _on_load_finished(self):
        self.page().runJavaScript("document.getElementById('num1').value", self.store_value)

    def store_value(self, param):
        self.value = param
        print("Param: " +str(param))

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

HTML:

<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>

解决方案

Based on the strategy that I used in my old answer, the solution is to inject a QObject through QWebChannel, and in it to make a binding with the button click event to update a slot. In this case I use Jinja2 to make writing the script easier.

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__), "form.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_())

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