How to access the outer components from listitemcomponents in listview bb10 qml? - qml

Question

I am not able to access the Datasource id from inside of the ListItemComponent. Can anyone help me in regards to this?
ListItemComponent {
type: "item"
Container {
id: listviewcontainer
Container {
preferredWidth: 768
layout: StackLayout {
orientation: LayoutOrientation.LeftToRight
}
CustomImageView {
leftPadding: 10
rightPadding: 10
url: ListItemData.from_image
horizontalAlignment: HorizontalAlignment.Left
verticalAlignment: VerticalAlignment.Center
}
Container {
preferredWidth: 538
layout: StackLayout {
orientation: LayoutOrientation.TopToBottom
}
Container {
layout: StackLayout {
orientation: LayoutOrientation.LeftToRight
}
Label {
text: ListItemData.from
textStyle {
base: SystemDefaults.TextStyles.TitleText
color: Color.create("#2db6ff")
}
}
ImageView {
imageSource: "asset:///Home/img.png"
verticalAlignment: VerticalAlignment.Center
}
}//Container
Label {
text: ListItemData.message
multiline: true
textStyle {
base: SystemDefaults.TextStyles.SubtitleText
}
content {
flags: TextContentFlag.Emoticons
}
}
Label {
id: time
text: ListItemData.time
textStyle {
base: SystemDefaults.TextStyles.SmallText
color: Color.create("#666666")
}
}
}//Container
ImageButton {
id: delete_btn
defaultImageSource: "asset:///Icon/delete.png"
pressedImageSource: "asset:///Icon/delete.png"
verticalAlignment: VerticalAlignment.Center
horizontalAlignment: HorizontalAlignment.Right
onClicked: {
deleteMessage(ListItemData.tid, ListItemData.uid);
}
function deleteMessage(tid, uid) {
var request = new XMLHttpRequest()
request.onreadystatechange = function() {
if (request.readyState == 4) {
var mResponse = request.responseText
mResponse = JSON.parse(mResponse)
var mResponseStatus = mResponse.response[0].receive.status;
var mMsg = mResponse.response[0].receive.message;
if (mResponseStatus == 1) {
msg_DataSource.source = "newurl.com" // This line not works here..
msg_DataSource.load(); // This line not works here..
} else if (mResponseStatus == 0) {
}
}
}// end function
request.open("GET", "myurl.com", true);
request.send();
}// deleteMessage
}//ImageButton
}//Container
}//Container
}//ListItemComponent
Here am not able to work out the following two lines
msg_DataSource.source = "newurl.com"
msg_DataSource.load();
I have tried like below but this also not working
listviewcontainer.ListItem.view.dataModel.message_DataSource.source = "myurl.com";
listviewcontainer.ListItem.view.dataModel.message_DataSource.load();
or this
listviewcontainer.ListItem.view.dataModel.source = "myurl.com";
listviewcontainer.ListItem.view.dataModel.load();

Answer 1

Another simplest way to store the object to global variable using the following code which works fine with me.
onCreationCompleted: {
Qt.tabbedPane = tabbedPane;
Qt.homeTab = homeTab;
}
Here I stored tabbedPane in global variable Qt.tabbedPane on page creation Completed.Now I able to access it from ListItemComponent using Qt.tabbedPane.
Hope it helps.

Answer 2

The simplest way to make the data model accessible would be to declare a property alias to your data model wherever it is defined, for example in your ListView QML file. This would make your data model accessible to the top level component in QML from this property alias. In effect, it gives you a global reference to your data model from anywhere else in QML.
For example, if you data model is called msg_DataSource, then in the QML file where it is defined you can create the property alias like this:
property alias myDataModel: msg_DataSource
Then in your ListItemComponent deleteMessage function, you can use myDataModel like this:
myDataModel.source = "newurl.com"
myDataModel.load();
Note: I am sure you could also do this in a more elegant way using signals and slots, but this way should be quicker and easier to understand.