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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.
674
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
121
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.
34
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