Problem referencing function children containers - noob question
I'm trying to highlight a list item in a list view when the user switches it. I get an error, which suggests that my function is not my container. I tried a bunch of different ways to reference the container by, I can't seem to find the solution.
Error: asset:///main.qml:114: ReferenceError: can't find variable: highlight
It happens in my setHighlight function. QML is as follows:
import bb.cascades 1.0 NavigationPane { id: navigationPane // auto-delete any page when popped from the NavigationPane onPopTransitionEnded: page.destroy() Page { Container { onCreationCompleted: _btController.deviceListing.discover() ListView { id: deviceList dataModel: _btController.deviceListing.model listItemComponents: [ ListItemComponent { type: "listItem" Container { layout: DockLayout { } Container { id: highlight background: Color.Black opacity: 0.1 horizontalAlignment: HorizontalAlignment.Fill verticalAlignment: VerticalAlignment.Fill } StandardListItem { title: ListItemData.deviceName description: ListItemData.deviceAddress status: ListItemData.deviceRSSI } } } ] function setHighlight(highlighted) { if (highlighted) { highlight.opacity = 0.5; } else { highlight.opacity = 0.0; } } onTriggered: { deviceList.toggleSelection(indexPath); setHighlight(ListItem.selected) } } } } }
Hello
That you reference ListItem.selected in ListView {}, but there is no there.
It is only available on the element root of ListItemComponent.
Something like this should work (untested):
ListItemComponent { type: "listItem" Container { id: rootItem layout: DockLayout {} Container { background: Color.Black opacity: rootItem.ListItem.selected ? 0.5 : 0.0 horizontalAlignment: HorizontalAlignment.Fill verticalAlignment: VerticalAlignment.Fill } ...
...
onTriggered: { deviceList.toggleSelection(indexPath); }
Select the element is a special case, but if you need to update the properties other than the selection, do not reference ListItemComponents directly. There may be multiple instances of a component and they are not guaranteed to exist, so they cannot be referenced by id from outside. All changes must be made by dataModel. In components bind to dataModel values.
Tags: BlackBerry Developers
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