从qt调用javascript函数返回空字符串
我试图从Qt调用一个Javascript函数。我的HTML页面如下所示从qt调用javascript函数返回空字符串,javascript,c++,qt,Javascript,C++,Qt,我试图从Qt调用一个Javascript函数。我的HTML页面如下所示 <html> <body> <script type="text/javascript"> myoperations.submit(); function test(){ return "Called me!"; } </script> </body> </html> myoperations.submit(); 功能测试(){ 返回“
<html>
<body>
<script type="text/javascript">
myoperations.submit();
function test(){
return "Called me!";
}
</script>
</body>
</html>
myoperations.submit();
功能测试(){
返回“呼叫我!”;
}
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"
/。。所有必要的措施包括
类MyJavaScriptOperations:公共QObject{
Q_对象
公众:
MyJavaScriptOperations(){
qDebug()调整大小(400500);
QVariant f1result=view2->page()->mainFrame()->evaluateJavaScript(“test()”);
qDebug()show();
}
};
int main(int argc,char*argv[])
{
质量保证申请a(argc、argv);
QWebView*视图=新的QWebView();
查看->调整大小(400500);
查看->页面()->mainFrame()->addToJavaScriptWindowObject(“myoperations”,新的MyJavaScriptOperations);
查看->加载(QUrl(“file:///C:/programs/test.html"));
查看->显示();
返回a.exec();
}
#包括“main.moc”
在控制台中,我将f1result
设置为“”(一个空字符串)。为什么不显示返回值
有人能帮我吗?您正在submit()中创建第二个QWebView,而不是使用添加对象的QWebView。以下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"
QWebView*视图;
类MyJavaScriptOperations:公共QObject{
Q_对象
公众:
MyJavaScriptOperations(){
qDebug()page()->mainFrame()->evaluateJavaScript(“test()”);
qDebug()调整大小(400500);
查看->页面()->mainFrame()->addToJavaScriptWindowObject(“myoperations”,新的MyJavaScriptOperations);
查看->加载(QUrl(“file:///tmp/o/index.html"));
查看->显示();
返回a.exec();
}
#包括“main.moc”