TypeError: Result of expression 'item' [undefined] is not an object.

Hello

I can userstand the good way to spend the ListItemData given to a page entry. In the example ListView generated here is what is generated.

import bb.cascades 1.2
NavigationPane {
    id: nav
    Page {
        Container {
            ListView {
                dataModel: XmlDataModel {
                    source: "data.xml"
                }
                onTriggered: {
                    if (indexPath.length > 1) {
                        var chosenItem = dataModel.data(indexPath);
                        var contentpage = itemPageDefinition.createObject();
                        contentpage.itemPageTitle = chosenItem.name
                        nav.push(contentpage);
                    }
                }
                accessibility.name: "Listing"
            }
        }
    }
    attachedObjects: [
        ComponentDefinition {
            id: itemPageDefinition
            source: "ItemPage.qml"
        }
    ]
    onPopTransitionEnded: {
        page.destroy();
    }
}

import bb.cascades 1.2
Page {
    property alias itemPageTitle: titlebar.title
    titleBar: TitleBar {
        id: titlebar
    }
    Container {
    }
}

If I wanted to copy the input data to the push page, then I can do that.

import bb.cascades 1.2
NavigationPane {
    id: nav
    Page {
        Container {
            ListView {
                dataModel: XmlDataModel {
                    source: "data.xml"
                }
                onTriggered: {
                    if (indexPath.length > 1) {
                        var chosenItem = dataModel.data(indexPath);
                        var contentpage = itemPageDefinition.createObject();
                        contentpage.item = chosenItem
                        nav.push(contentpage);
                    }
                }
                accessibility.name: "Listing"
            }
        }
    }
    attachedObjects: [
        ComponentDefinition {
            id: itemPageDefinition
            source: "ItemPage.qml"
        }
    ]
    onPopTransitionEnded: {
        page.destroy();
    }
}

import bb.cascades 1.2
Page {
    property variant item
    titleBar: TitleBar {
        id: titlebar
        title: item.name
    }
    Container {
    }
}

And this also works except that it generates a

TypeError: Result of expression 'item' [undefined] is not an object.

error. Thus, it is written in the ebook learn Blackberry App Development 10. Anyone know how to get this to work without him spit the error type?

Thank you

the problem is that the point is not defined when the page is created.
a solution would be to use onItemChanged to set the title.
or use something like element? Item.Name;
There are many other possible solutions, but these two come to mind that the easier.

Tags: BlackBerry Developers

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