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[英]Calling javascript string function on browser from Unity returns null
[英]Calling javascript function from qt returns empty string
我试图从Qt调用Javascript函数。 我的HTML页面看起来像这样,
<html>
<body>
<script type="text/javascript">
myoperations.submit();
function test(){
return "Called me!";
}
</script>
</body>
</html>
这是我的Qt文件
/.. all necessary include ../
class MyJavaScriptOperations : public QObject {
Q_OBJECT
public:
MyJavaScriptOperations(){
qDebug() << "In constructor";
}
public slots:
Q_INVOKABLE
void submit()
{
QWebView *view2 = new QWebView();
view2->resize(400,500);
QVariant f1result = view2->page()->mainFrame()->evaluateJavaScript("test()");
qDebug() << f1result.toString();
view2->show();
}
};
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("file:///C:/programs/test.html"));
view->show();
return a.exec();
}
#include "main.moc"
在控制台中,我得到f1result
为“”(空字符串)。 为什么不显示返回值?
有人可以帮助我吗?
您在submit()中创建了第二个QWebView,而不是使用添加了对象的QWebView。 这是您的代码的固定版本:
QWebView *view;
class MyJavaScriptOperations : public QObject {
Q_OBJECT
public:
MyJavaScriptOperations(){
qDebug() << "In constructor";
}
Q_INVOKABLE void submit()
{
QVariant f1result = view->page()->mainFrame()->evaluateJavaScript("test()");
qDebug() << f1result.toString();
}
};
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
view = new QWebView;
view->resize(400, 500);
view->page()->mainFrame()->addToJavaScriptWindowObject("myoperations", new MyJavaScriptOperations);
view->load(QUrl("file:///tmp/o/index.html"));
view->show();
return a.exec();
}
#include "main.moc"
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