Question

我需要在列表视图中获取行数no black 10 cascades qml？列表视图数据源模型类型为json。我试过这个

ListItem.initialized ? ListItem.view.dataModel.childCount(ListItem.indexPath) : 0

但它的列表视图行数仅显示0，大于1。

我的代码

dataModel: groupdatamodel 
listItemComponents: [ 
    ListItemComponent { 
        type: "header" 

        Container { 
            preferredWidth: 748 
            layout: DockLayout { }

            Label {
                text: "Title" 
                base: SystemDefaults.TextStyles.TitleText
                fontWeight: FontWeight.Bold
            }
        }

        Label { 
            id: subtitle 
            text: groupdatamodel.size() + "Items"

            textStyle { 
                base: SystemDefaults.TextStyles.SmallText 
                fontWeight: FontWeight.Bold
        } 
    }
]

Answer 1

Main.qml

import bb.cascades 1.0
import bb.data 1.0

Page {
    content: Container {
        Label {
            text: "List View with json parsing"
        }
        ListView {
            id: listViewDemo
            dataModel: GroupDataModel {
                grouping: ItemGrouping.None
            }
            listItemComponents: [
                ListItemComponent {
                    type: "listItem"
                    StandardListItem {
                        title: ListItemData.ThumnailImage
                        description: ListItemData.CategoryID
                    }
                }
            ]
            function itemType(data, indexPath) {
                return "listItem";
            }
        }
    }
    attachedObjects: [
        DataSource {
            id: serviceDataSource
            source: "contacts.json"
            type: DataSourceType.Json
            onDataLoaded: {
                listViewDemo.dataModel.clear();
                listViewDemo.dataModel.insertList(data)
            }
        }
    ]
    onCreationCompleted: {
        serviceDataSource.load();
    }
}

Contacts.json
```
[   {"CategoryID":"3","CategoryName":"News","CountryID":"1","Result":"OK"},
```
{"CategoryID":"4","CategoryName":"Daily Paper","CountryID":"1","Result":"OK"},{"CategoryID":"5","CategoryName":"Thanthi","CountryID":"1","Result":"OK"}, {"CategoryID":"1","CategoryName":"Newspaper","CountryID":"1","Result":"OK"}, {"CategoryID":"2","CategoryName":"Magazine","CountryID":"1","Result":"OK"} ]
的main.cpp

在主档

#include <bb/data/DataSource>
#include <bb/data/JsonDataAccess>

Q_DECL_EXPORT int main(int argc, char **argv)
{
    // We want to use DataSource in QML
    bb::data::DataSource::registerQmlTypes();

4.FILENAME.PRO

LIBS + = -lbbdata

Answer 2

DataModel :: childCount（ListItem indexPath）返回indexPath指定的列表中项目的子计数，而不是数据模型中数据项的计数（因此可用于列表）。您需要询问实际的数据模型。例如，GroupDataModel :: size（）返回GroupDataModel中的项目数，类似于QListDataModel。

Answer 3

我在我的项目中使用此代码并且工作正常：

 console.log("pcs count" + pcsListModel.childCount(0));

Answer 4

除非您使用自定义数据模型，否则无法在标签中添加自定义元素。

Answer 5

你可以使用：

your_groupdatamodel.size().toString();

或

your_groupdatamodel.childCount(0);

在javascript代码中。

学家

如何在黑莓10 cascades qml中获取列表视图行数？

5 个答案: