Cascades Development

[Shwarup]

Hi,

I load a page in Cascade WebView. Should I close the WebView before opening another page?

[lewellyn]

I believe it's supposed to be safe to reuse the WebView. But please do report back here with any specific problems.

https://developer.blackberry.com/cascades/documentation/ui/webview/loadingwebcontent.html may be a very useful starting point, if you've not already found it.

[Shwarup]

Hi,

I want to open a new page when url change in Cascade WebView.  I am getting an error

"Context: Failed to find target node with id 17"

Is there any mistake i did while opening a new page?

My Code Sample:

MyApp::MyApp(bb::cascades::Application *app)

: QObject(app){

 qmlRegisterType<PostHttp>("Network.PostHttp", 1, 0, "PostHttp");

//add a QTimer class as a qml type

qmlRegisterType<QTimer>("my.library", 1, 0, "QTimer");

qml = QmlDocument::create("asset:///main.qml").parent(this);

qml->setContextProperty("securityApp", this);

// create root object for the UI

AbstractPane *root = qml->createRootObject<AbstractPane>();

// set created root object as a scene

app->setScene(root);

}

void MyApp::onUrlChangedEvent(QString url){

QStringList myStringList = url.split("|");

 if(myStringList.length()>2){

if(myStringList.at(0).startsWith("empcmd:")){

createPageFromCpp();

}

else{

QString xmlData = myStringList.at(myStringList.length()-1);

ReadXMLDOM *readXMLDOM =new ReadXMLDOM(this);

readXMLDOM->readResponseXML(xmlData);

}

}

}

void MyApp::createPageFromCpp(){

// Create the root page and the button

Page* root =newPage;

Button* myButton = Button::create("My Rotating Button");

// Create a rotation animation and associate it with the button

RotateTransition* rotation = RotateTransition::create(myButton)

.toAngleZ(360)

.duration(350);

// value to detect any errors.boolres = QObject::connect(myButton, SIGNAL(clicked()), rotation, SLOT(play()));

Q_ASSERT(res);

// Indicate that the variable res isn't used in the rest of the app, to prevent// a compiler warning

Q_UNUSED(res);

// Set the content of the page and display it

root->setContent(myButton);

Application::instance()->setScene(root);

 }

[lewellyn]

I find it hard to follow the code as pasted (there's a clipboard with a "C" on it in the rich text editor; it allows you to paste code better).

However, at a glance, I do not see where you are passing a URL to the WebView, let alone using setURL to re-use the webview. Additionally, I see no reason here to be creating multiple WebViews.

https://developer.blackberry.com/cascades/reference/bb__cascades__webview.html might be helpful so you know what WebView supports.

You will, of course, want to destroy the WebView when your app closes, but until then you haven't given any good reason to "close" it.