在QtWebkit中，如何安装从C ++到Javaobject窗口的回调？ [英] In QtWebkit, how to install the callback from C++ to Javaobject window?
问题描述
我已经实现了HTML-JS，这使用 QtWebkit 从JS调用C ++方法。我能够成功。现在，我想从C ++方法发送一个回调到JavaScript窗口。
这是我的代码。 #include< QtGui / QApplication>
#include< QApplication>
#include< QDebug>
#include< QWebFrame>
#include< QWebPage>
#include< QWebView>
class MyJavaScriptOperations：public QObject {
Q_OBJECT
public：
Q_INVOKABLE qint32 MultOfNumbers（int a，int b）{
qDebug（）< ; a * b;
return（a * b）;
}
};
int main（int argc，char * argv []）
{
QApplication a（argc，argv）;
QWebView * view = new QWebView（）;
view-> resize（400，500）;
view-> page（） - > mainFrame（） - > addToJavaScriptWindowObject（myoperations，new MyJavaScriptOperations）;
view-> load（QUrl（./ shreyas.html））;
view-> show（）;
return a.exec（）;
}
#includemain.moc
。
< html>
< head>
< script>
函数Multiply（）
{
var result = myoperations.MultOfNumbers（document.forms [DEMO_FORM] [Multiplicant_A]。 forms [DEMO_FORM] [Multiplicant_B]。value）;
document.getElementById（answer）。value = result;
}
< / script>
< / head>
< body>
< form name =DEMO_FORM>
乘数A：< input type =numbername =Multiplicant_A>< br>
乘数B：< input type =numbername =Multiplicant_B>< br>
结果：< input type =numberid =answername =Multiplicant_C>< br>
< input type =buttonvalue =Multiplication_compute_on_C ++onclick =Multiply（）>
< / form>
< / body>
< / html>
我不知道你能不能调用JS回调直接，但在一个捏，你可以使用你的主框架的 evaluateJavascript （）方法从C ++调用一些JS。
或者你可以连接到JavaScript端的信号，参见 Qt QWEBview JavaScript回调一些想法。
对连接的一个很好的概述机制也可以在 Qt文档中找到。 p>
I have implemented the HTML-JS, this calls the C++ method from the JS using QtWebkit. I am able to do it successfully. Now, I want to send a callback to JavaScript window from the C++ method. How can I do so?
Here is my code.
#include <QtGui/QApplication>
#include <QApplication>
#include <QDebug>
#include <QWebFrame>
#include <QWebPage>
#include <QWebView>
class MyJavaScriptOperations : public QObject {
Q_OBJECT
public:
Q_INVOKABLE qint32 MultOfNumbers(int a, int b) {
qDebug() << a * b;
return (a*b);
}
};
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QWebView *view = new QWebView();
view->resize(400, 500);
view->page()->mainFrame()->addToJavaScriptWindowObject("myoperations", new MyJavaScriptOperations);
view->load(QUrl("./shreyas.html"));
view->show();
return a.exec();
}
#include "main.moc"
The Java script is here.
<html>
<head>
<script>
function Multiply()
{
var result = myoperations.MultOfNumbers(document.forms["DEMO_FORM"]["Multiplicant_A"].value, document.forms["DEMO_FORM"]["Multiplicant_B"].value);
document.getElementById("answer").value = result;
}
</script>
</head>
<body>
<form name="DEMO_FORM">
Multiplicant A: <input type="number" name="Multiplicant_A"><br>
Multiplicant B: <input type="number" name="Multiplicant_B"><br>
Result : <input type="number" id="answer" name="Multiplicant_C"><br>
<input type="button" value="Multiplication_compute_on_C++" onclick="Multiply()">
</form>
</body>
</html>
I don't know if you can somehow call a JS callback directly, but in a pinch you could use your main frame's evaluateJavascript() method to call some JS from C++.
Or you can connect to signals from the JavaScript side, see Qt QWEBview JavaScript callback for some ideas.
A good overview over the connection mechanisms can also be found in the Qt docs
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