Qt QWEBview JavaScript 回调

发布于 2024-10-16 23:49:01 字数 324 浏览 10 评论 0原文

如何将函数“指针”从 JavaScript 传递到槽？

在 JavaScript 中：

function f1()
{
    alert("f1");
}
qtclass.submit(f1);

和在 Qt 中：

public slots:
    void submit(void * ptr) 
    {
        (void)ptr;
    }

一旦完成一些处理，我需要“f1”函数从 c++ 中的 JavaScript 中触发。另外我事先也不知道函数指针的名称。

原文

How to pass a function "pointer" from JavaScript to a slot?

in JavaScript:

function f1()
{
    alert("f1");
}
qtclass.submit(f1);

and in Qt:

public slots:
    void submit(void * ptr) 
    {
        (void)ptr;
    }

I need the "f1", function to get fired in the JavaScript from the c++, once some processing is done. Also I do not know in advance the name of the function pointer.

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萌辣 2024-10-23 23:49:01

您应该能够使用 QWebFrame::evaluateJavaScript 方法执行脚本。看看下面的示例是否适合您：

初始化 webview:

QWebView *view = new QWebView(this->centralWidget());
view->load(QUrl("file:///home//test.html"));
connect(view, SIGNAL(loadFinished(bool)), this, SLOT(loadFinished(bool)));

loadFinished 信号处理程序:

void MyTestWindow::loadFinished(bool)
{
    QVariant f1result = ((QWebView*)sender())->page()->mainFrame()->evaluateJavaScript("f1('test param')");
    qDebug() << f1result.toString();
}

test.html:

<head>
    <script LANGUAGE="JavaScript">
        function f1 (s) 
        {
            alert (s) 
            return "f1 result"
        }
    </script>
</head>
<body>
    test html
</body>

evaluateJavaScript 应触发警报消息框并返回带有 f1 函数结果的 QVariant。

希望这有帮助，问候

you should be able to execute your script using QWebFrame::evaluateJavaScript method. See if an example below would work for you:

initializing webview:

QWebView *view = new QWebView(this->centralWidget());
view->load(QUrl("file:///home//test.html"));
connect(view, SIGNAL(loadFinished(bool)), this, SLOT(loadFinished(bool)));

loadFinished signal handler:

void MyTestWindow::loadFinished(bool)
{
    QVariant f1result = ((QWebView*)sender())->page()->mainFrame()->evaluateJavaScript("f1('test param')");
    qDebug() << f1result.toString();
}

test.html:

<head>
    <script LANGUAGE="JavaScript">
        function f1 (s) 
        {
            alert (s) 
            return "f1 result"
        }
    </script>
</head>
<body>
    test html
</body>

evaluateJavaScript should trigger an alert message box and return QVariant with f1 function result.

hope this helps, regards

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蝶…霜飞 2024-10-23 23:49:01

您可以通过使用 Qt 信号以另一种方式解决此问题，如下所示：

class qtclass
{
   signals:
      void done(QString message);
};

在您的 HTML 文件中，您可以连接到此信号，如下所示：

qtclass.done.connect(f1);

function f1(message)
{
   alert('f1 called from qtclass with message' + message);
}

然后您的 C++ 类不需要了解 javascript 函数。

You could solve this in another way, by using Qt signals, as follows:

class qtclass
{
   signals:
      void done(QString message);
};

In your HTML file you can connect to this signal, like this:

qtclass.done.connect(f1);

function f1(message)
{
   alert('f1 called from qtclass with message' + message);
}

Then you C++ class does not need to know about the javascript function.

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凑诗 2024-10-23 23:49:01

虽然它并非在所有情况下都有效，但您可以简单地将一个字符串传递到您的插槽中。然后你的槽可以使用evaluateJavaScript（正如serge建议的那样）来调用该函数。

function f1()
{
    alert("f1");
}
qtclass.submit("f1");

在 Qt 中：

public slots:
    void submit(QString functionName) 
    {
        m_pWebView->page()->mainFrame()->evaluateJavaScript(functionName + "()");
    }

While it wouldn't work in all cases, you could simply pass a string to your slot. Your slot could then use evaluateJavaScript (as serge has suggested) to call the function.

function f1()
{
    alert("f1");
}
qtclass.submit("f1");

and in Qt:

public slots:
    void submit(QString functionName) 
    {
        m_pWebView->page()->mainFrame()->evaluateJavaScript(functionName + "()");
    }

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歌枕肩 2024-10-23 23:49:01

我这里有一个完整的工作解决方案 - 使用插槽。但是，我无法按照库尔特的建议使信号正常工作。

#include <QtGui/QApplication>
#include <QApplication>
#include <QDebug>
#include <QWebFrame>
#include <QWebPage>
#include <QWebView>

class MyJavaScriptOperations : public QObject {
    Q_OBJECT
public:
     QWebView *view;
     MyJavaScriptOperations();

    Q_INVOKABLE qint32 MultOfNumbers(int a, int b) {
        qDebug() << a * b;
        return (a*b);
    }
public slots:
     void callback();
public:

void  firecb();

 signals:
      void done();
};


MyJavaScriptOperations::MyJavaScriptOperations()
{
    view = new QWebView();
    view->resize(400, 500);

    connect(view->page()->mainFrame(), SIGNAL(javaScriptWindowObjectCleared()), this, SLOT(callback()));

    view->load(QUrl("./shreyas.html"));

    view->show();


    qDebug()<<view;


}

void MyJavaScriptOperations::callback()
{
    qDebug()<<"Sending hello text";
    QString function = "f1()";
    view->page()->mainFrame()->addToJavaScriptWindowObject("myoperations", this);
    view->page()->mainFrame()->evaluateJavaScript("f1()");
    done();
}

void  MyJavaScriptOperations::firecb()
{
     qDebug()<<"Emitting Signal";
     done();
}

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);


    MyJavaScriptOperations *jvs = new MyJavaScriptOperations;
    jvs->firecb();

    return a.exec();
}
#include "main.moc"

html 文件的更改是 -

<head>
    <script LANGUAGE="JavaScript">


function f1()
{
   alert('f1 called from qtclass with message');
   document.write("HELLLLLLLLL");
}
myoperations.callback(f1);


function f2()
{
   var result = myoperations.MultOfNumbers(3,7);
   document.write(result);
    alert('f1 called from qtclass with message');
}


function f3()
{

    alert('f3');
}

myoperations.done.connect(f3);


    </script>
</head>
<body>
    test html
<input type="button" value="click" onclick="f2()">
</body>

I have one entire working solution here - using slots. However, I couldn't get the signals working as suggested by Kurt.

#include <QtGui/QApplication>
#include <QApplication>
#include <QDebug>
#include <QWebFrame>
#include <QWebPage>
#include <QWebView>

class MyJavaScriptOperations : public QObject {
    Q_OBJECT
public:
     QWebView *view;
     MyJavaScriptOperations();

    Q_INVOKABLE qint32 MultOfNumbers(int a, int b) {
        qDebug() << a * b;
        return (a*b);
    }
public slots:
     void callback();
public:

void  firecb();

 signals:
      void done();
};


MyJavaScriptOperations::MyJavaScriptOperations()
{
    view = new QWebView();
    view->resize(400, 500);

    connect(view->page()->mainFrame(), SIGNAL(javaScriptWindowObjectCleared()), this, SLOT(callback()));

    view->load(QUrl("./shreyas.html"));

    view->show();


    qDebug()<<view;


}

void MyJavaScriptOperations::callback()
{
    qDebug()<<"Sending hello text";
    QString function = "f1()";
    view->page()->mainFrame()->addToJavaScriptWindowObject("myoperations", this);
    view->page()->mainFrame()->evaluateJavaScript("f1()");
    done();
}

void  MyJavaScriptOperations::firecb()
{
     qDebug()<<"Emitting Signal";
     done();
}

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);


    MyJavaScriptOperations *jvs = new MyJavaScriptOperations;
    jvs->firecb();

    return a.exec();
}
#include "main.moc"

The html file changes are -

<head>
    <script LANGUAGE="JavaScript">


function f1()
{
   alert('f1 called from qtclass with message');
   document.write("HELLLLLLLLL");
}
myoperations.callback(f1);


function f2()
{
   var result = myoperations.MultOfNumbers(3,7);
   document.write(result);
    alert('f1 called from qtclass with message');
}


function f3()
{

    alert('f3');
}

myoperations.done.connect(f3);


    </script>
</head>
<body>
    test html
<input type="button" value="click" onclick="f2()">
</body>

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