# NativeScript CollectionView

A NativeScript CollectionView widget. The CollectionView displays data in separate cells, each cell representing one data item. For iOS wraps up UICollectionView and for Android wraps up RecyclerView. This can be used as an Open Source alternative to RadListView.

iOS Demo	Android Demo

Table of Contents

1. Installation
2. Configuration
3. API
4. Usage
5. Usage in Angular
6. Usage in Vue
7. Usage in Svelte
8. Usage in React
9. Demos

Installation

Run the following command from the root of your project:

ns plugin add @nativescript-community/ui-collectionview

This command automatically installs the necessary files, as well as stores @nativescript-community/ui-collectionview as a dependency in your project's package.json file.

Configuration

There is no additional configuration needed!

API

Events

Properties

Methods

Usage

You need to add xmlns:gv="@nativescript-community/ui-collectionview" to your page tag, and then simply use <gv:CollectionView/> in order to add the widget to your page. Use <gv:Gridview.itemTemplate/> to specify the template for each cell:

Simple Example:

Create a simple array of objects in your JS/TS file.

const items = [
    { index: 0, name: 'TURQUOISE', color: '#1abc9c' },
    { index: 1, name: 'EMERALD', color: '#2ecc71' },
    { index: 2, name: 'PETER RIVER', color: '#3498db' },
    { index: 3, name: 'AMETHYST', color: '#9b59b6' },
    { index: 4, name: 'WET ASPHALT', color: '#34495e' },
    { index: 5, name: 'GREEN SEA', color: '#16a085' },
    { index: 6, name: 'NEPHRITIS', color: '#27ae60' },
    { index: 7, name: 'BELIZE HOLE', color: '#2980b9' },
    { index: 8, name: 'WISTERIA', color: '#8e44ad' },
    { index: 9, name: 'MIDNIGHT BLUE', color: '#2c3e50' }
];

<!-- test-page.xml -->
<Page xmlns="http://schemas.nativescript.org/tns.xsd" xmlns:gv="@nativescript-community/ui-collectionview" loaded="pageLoaded">
    <GridLayout>
        <gv:CollectionView items="{{ items }}" colWidth="50%" rowHeight="100">
            <gv:CollectionView.itemTemplate>
                <Label text="{{ value }}" verticalAlignment="center"/>
            </gv:CollectionView.itemTemplate>
        </gv:CollectionView>
    </GridLayout>
</Page>

Templates Example:

You can also have multiple templates the same way you add them in the builtin ListView control:

<gv:CollectionView id="gv" row="0" class="{{ cssClass }}" items="{{ items }}" 
                colWidth="{{ colWidth }}" rowHeight="{{ rowHeight }}" itemTemplateSelector="templateSelector"
                itemTap="gridViewItemTap" itemLoading="gridViewItemLoading" loadMoreItems="gridViewLoadMoreItems">
    <gv:CollectionView.itemTemplates>
        <template key="odd">
            <GridLayout backgroundColor="#33ffff" style="margin: 10 10 0 0">
                <Label text="{{ value }}" verticalAlignment="center"/>
            </GridLayout>
        </template>

        <template key="even">
            <GridLayout backgroundColor="#33ffff" rows="auto, auto" style="margin: 10 10 0 0">
                <Label row="0" text="{{ value }}" verticalAlignment="center"/>
                <Label row="1" text="{{ value }}" verticalAlignment="center"/>
            </GridLayout>
        </template>
    </gv:CollectionView.itemTemplates>
</gv:CollectionView>

export function templateSelector(item: any, index: number, items: any) {
    return index % 2 === 0 ? "even" : "odd";
}

Usage in Angular

Import the module into your project.

import { CollectionViewModule } from '@nativescript-community/ui-collectionview/angular';

@NgModule({
    imports: [
        CollectionViewModule,
    ],
})

Simple Example:

Create a simple array of objects in your Typescript file.

items = [
    { index: 0, name: 'TURQUOISE', color: '#1abc9c' },
    { index: 1, name: 'EMERALD', color: '#2ecc71' },
    { index: 2, name: 'PETER RIVER', color: '#3498db' },
    { index: 3, name: 'AMETHYST', color: '#9b59b6' },
    { index: 4, name: 'WET ASPHALT', color: '#34495e' },
    { index: 5, name: 'GREEN SEA', color: '#16a085' },
    { index: 6, name: 'NEPHRITIS', color: '#27ae60' },
    { index: 7, name: 'BELIZE HOLE', color: '#2980b9' },
    { index: 8, name: 'WISTERIA', color: '#8e44ad' },
    { index: 9, name: 'MIDNIGHT BLUE', color: '#2c3e50' }
];

Add the following to your component HTML.

<CollectionView [items]="items" colWidth="50%" rowHeight="100">
    <ng-template let-item="item">
        <Label [text]="item.name"></Label>
    </ng-template>
</CollectionView>

Templates Example:

If you want to use multiple item templates, you can do that very similarly to how you do it for the builtin ListView control. The only difference is that due to current limitations instead of using the nsTemplateKey directive you need to use the cvTemplateKey directive that comes from the CollectionView. (In a future version, once the framework allows it this will be changed and you will be able to use the same directive for the CollectionView as well)

<CollectionView row="1" [items]="items" colWidth="33%" rowHeight="100" [itemTemplateSelector]="templateSelector">
    <ng-template cvTemplateKey="Defender" let-item="item" let-odd="odd">
        <StackLayout [nsRouterLink]="['/item', item.id]" borderColor="blue" borderWidth="2" borderRadius="5" verticalAlignment="stretch" class="list-group-item" [class.odd]="odd">
        <Label verticalAlignment="center" [text]="item.name" class="list-group-item-text" textWrap="true"></Label>
        </StackLayout>
    </ng-template>

    <ng-template cvTemplateKey="Goalkeeper" let-item="item" let-odd="odd">
        <StackLayout [nsRouterLink]="['/item', item.id]" borderColor="black" borderWidth="2" borderRadius="5" verticalAlignment="stretch" class="list-group-item" [class.odd]="odd">
        <Label verticalAlignment="center" [text]="item.name" class="list-group-item-text" textWrap="true"></Label>
        </StackLayout>
    </ng-template>

    <ng-template cvTemplateKey="Midfielder" let-item="item" let-odd="odd">
        <StackLayout [nsRouterLink]="['/item', item.id]" borderColor="yellow" borderWidth="2" borderRadius="5" verticalAlignment="stretch" class="list-group-item" [class.odd]="odd">
        <Label verticalAlignment="center" [text]="item.name" class="list-group-item-text" textWrap="true"></Label>
        </StackLayout>
    </ng-template>

    <ng-template cvTemplateKey="Forward" let-item="item" let-odd="odd">
        <StackLayout [nsRouterLink]="['/item', item.id]" borderColor="red" borderWidth="2" borderRadius="5" verticalAlignment="stretch" class="list-group-item" [class.odd]="odd">
        <Label verticalAlignment="center" [text]="item.name" class="list-group-item-text" textWrap="true"></Label>
        </StackLayout>
    </ng-template>
</CollectionView>

For a more complete example, look in the demo-ng directory.

Usage in Vue

Register the plugin in your app.ts.

import CollectionView from '@nativescript-community/ui-collectionview/vue';
Vue.use(CollectionView);

Simple Example:

In your component, add the following to make a simple array of objects.

export default {
    // ...
    data() {
        const items = [
            { index: 0, name: 'TURQUOISE', color: '#1abc9c' },
            { index: 1, name: 'EMERALD', color: '#2ecc71' },
            { index: 2, name: 'PETER RIVER', color: '#3498db' },
            { index: 3, name: 'AMETHYST', color: '#9b59b6' },
            { index: 4, name: 'WET ASPHALT', color: '#34495e' },
            { index: 5, name: 'GREEN SEA', color: '#16a085' },
            { index: 6, name: 'NEPHRITIS', color: '#27ae60' },
            { index: 7, name: 'BELIZE HOLE', color: '#2980b9' },
            { index: 8, name: 'WISTERIA', color: '#8e44ad' },
            { index: 9, name: 'MIDNIGHT BLUE', color: '#2c3e50' }
        ];
        return {
            itemList: items
        };
    },
    // ...
};

Then add the following XML to your component.

<CollectionView
    :items="itemList"
    colWidth="50%"
    rowHeight="100"
>
    <v-template>
        <Label :text="item.name"></Label>
    </v-template>
</CollectionView>

For a more complete example, look in the demo-vue directory.

Usage in Svelte

Register the plugin in your app.ts.

import CollectionViewElement from '@nativescript-community/ui-collectionview/svelte';
CollectionViewElement.register();

Simple Example:

In you component, add the following to import Svelte Templates and to create a simple array of objects.

import { Template } from 'svelte-native/components';

const items = [
    { index: 0, name: 'TURQUOISE', color: '#1abc9c' },
    { index: 1, name: 'EMERALD', color: '#2ecc71' },
    { index: 2, name: 'PETER RIVER', color: '#3498db' },
    { index: 3, name: 'AMETHYST', color: '#9b59b6' },
    { index: 4, name: 'WET ASPHALT', color: '#34495e' },
    { index: 5, name: 'GREEN SEA', color: '#16a085' },
    { index: 6, name: 'NEPHRITIS', color: '#27ae60' },
    { index: 7, name: 'BELIZE HOLE', color: '#2980b9' },
    { index: 8, name: 'WISTERIA', color: '#8e44ad' },
    { index: 9, name: 'MIDNIGHT BLUE', color: '#2c3e50' }
];

Then add the following XML to your component:

<collectionView 
    {items} 
    colWidth="50%"
    rowHeight="100"
>
    <Template let:item>
        <label text="{item.name}" />
    </Template>
</collectionView>

For a more complete example, look in the demo-svelte directory.

Usage in React

Register the plugin in your app.ts.

import { registerCollectionView } from '@nativescript-community/ui-collectionview/react';
registerCollectionView();

Simple Example:

In your component, add the following code to create a simple list.

import { CollectionView } from '@nativescript-community/ui-collectionview/react';

const items = [
    { index: 0, name: 'TURQUOISE', color: '#1abc9c' },
    { index: 1, name: 'EMERALD', color: '#2ecc71' },
    { index: 2, name: 'PETER RIVER', color: '#3498db' },
    { index: 3, name: 'AMETHYST', color: '#9b59b6' },
    { index: 4, name: 'WET ASPHALT', color: '#34495e' },
    { index: 5, name: 'GREEN SEA', color: '#16a085' },
    { index: 6, name: 'NEPHRITIS', color: '#27ae60' },
    { index: 7, name: 'BELIZE HOLE', color: '#2980b9' },
    { index: 8, name: 'WISTERIA', color: '#8e44ad' },
    { index: 9, name: 'MIDNIGHT BLUE', color: '#2c3e50' }
];

interface Item {
    index: number;
    name: string;
    color: string;
}

const cellFactory = (item: Item) => (
    <label text={item.name} />
);

export function First() {
    return (
        <CollectionView items={items} colWidth="50%" rowHeight="100" cellFactory={cellFactory} width="100%" height="100%" />
    );
}

For a more complete example, look in the demo-react directory.

Demos

This repository includes Angular, Vue.js, and Svelte demos. In order to run these execute the following in your shell:

$ git clone https://github.com/@nativescript-community/ui-collectionview
$ cd ui-collectionview
$ npm i
$ npm run setup
$ npm run build # && npm run build.angular
$ cd demo-ng # or demo-vue or demo-svelte
$ ns run ios|android