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nativescript-grid-view

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A NativeScript GridView widget. The GridView displays data in separate cells, each cell representing one data item. For iOS wraps up UICollectionView and for Android wraps up RecyclerView

Screenshot

Screenshot of Android

Installation

Run the following command from the root of your project:

tns plugin add nativescript-grid-view

This command automatically installs the necessary files, as well as stores nativescript-grid-view as a dependency in your project's package.json file.

Configuration

There is no additional configuration needed!

API

Events

  • itemLoading
    Triggered when generating an item in the GridView.

  • itemTap
    Triggered when the user taps on an item in the GridView.

  • loadMoreItems
    Triggered when the generated items reached the end of the items property.

Static Properties

  • itemLoadingEvent - String
    String value used when hooking to itemLoadingEvent event.

  • itemTapEvent - String
    String value used when hooking to itemTapEvent event.

  • loadMoreItemsEvent - String
    String value used when hooking to itemTapEvent event.

Instance Properties

  • ios - UICollectionView
    Gets the native iOS view that represents the user interface for this component. Valid only when running on iOS.

  • android - android.support.v7.widget.RecyclerView
    Gets the native android widget that represents the user interface for this component. Valid only when running on Android OS.

  • items - Array | ItemsSource
    Gets or sets the items collection of the GridView. The items property can be set to an array or an object defining length and getItem(index) method.

  • itemTemplate - String
    Gets or sets the item template of the GridView.

  • rowHeight - PercentLength
    Gets or sets the height for every row in the GridView.

  • colWidth - PercentLength
    Gets or sets the width for every column in the GridView.

Instance Methods

  • refresh()
    Forces the GridView to reload all its items.

Usage

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

<!-- test-page.xml -->
<Page xmlns="http://schemas.nativescript.org/tns.xsd" xmlns:gv="nativescript-grid-view" loaded="pageLoaded">
  <GridLayout>
    <gv:GridView items="{{ items }}" colWidth="24%" rowHeight="15%" padding="5" itemTap="gridViewItemTap" itemLoading="gridViewItemLoading" loadMoreItems="gridViewLoadMoreItems">
      <gv:GridView.itemTemplate>
        <GridLayout backgroundColor="#33ffff" style="margin: 5">
          <Label text="{{ value }}" verticalAlignment="center"/>
        </GridLayout>
      </gv:GridView.itemTemplate>
    </gv:GridView>
  </GridLayout>
</Page>
// test-page.ts
import { EventData, Observable } from "data/observable";
import { ObservableArray } from "data/observable-array";
import { Page } from "ui/page";
 
import { GridItemEventData } from "nativescript-grid-view";
 
let viewModel: Observable;
 
export function pageLoaded(args: EventData) {
    const page = args.object as Page;
    const items = new ObservableArray();
 
    for (let loop = 0; loop < 200; loop++) {
        items.push({ value: "test " + loop.toString() });
    }
    viewModel = new Observable();
    viewModel.set("items", items);
 
    page.bindingContext = viewModel;
}
 
export function gridViewItemTap(args: GridItemEventData) {
    console.log("tap index " + args.index.toString());
}
 
export function gridViewItemLoading(args: GridItemEventData) {
    console.log("item loading " + args.index.toString());
}
 
export function gridViewLoadMoreItems(args: EventData) {
    console.log("load more items");
}

Usage in Angular

Import GridViewModule in your NgModule:

import { GridViewModule } from 'nativescript-grid-view/angular';
 
@NgModule({
    //......
    imports: [
        //......
        GridViewModule,
        //......
    ],
    //......
})

Example Usage

// app.module.ts
import { GridViewModule } from "nativescript-grid-view/angular";
 
@NgModule({
    bootstrap: [
        AppComponent
    ],
    imports: [
        NativeScriptModule,
        AppRoutingModule,
        GridViewModule,
    ],
    declarations: [
        AppComponent,
        ItemsComponent,
        ItemDetailComponent
    ],
    providers: [
        ItemService
    ],
    schemas: [
        NO_ERRORS_SCHEMA
    ]
})
export class AppModule { }
<!-- my.component.html -->
<GridLayout class="page">
  <GridView [items]="items" colWidth="30%" rowHeight="100">
    <ng-template let-item="item" let-odd="odd">
      <StackLayout margin="10" [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>
  </GridView>
</GridLayout>

Working with Webpack+Uglify

In case you are uing webpack and also are minifying/uglifying your code, there are some specific names that should be excluded from the uglification for the widget to work properly. The GridView widget exports those and you need to add them to the mangle exclude option of the uglifyjs plugin in the webpack.common.js file:

var gridViewMangleExcludes = require("nativescript-grid-view/uglify-mangle-excludes").default;
//......
module.exports = function (platform, destinationApp) {
    //......
    if (process.env.npm_config_uglify) {
        plugins.push(new webpack.LoaderOptionsPlugin({
            minimize: true
        }));
 
        //Work around an Android issue by setting compress = false
        var compress = platform !== "android";
        plugins.push(new webpack.optimize.UglifyJsPlugin({
            mangle: {
                except: nsWebpack.uglifyMangleExcludes.concat(gridViewMangleExcludes),
            },
            compress: compress,
        }));
    }
   //......
}

Demos

This repository includes both Angular and plain NativeScript demos. In order to run those execute the following in your shell:

$ git clone https://github.com/peterstaev/nativescript-grid-view
cd nativescript-grid-view
$ npm install
$ npm run demo-ios

This will run the plain NativeScript demo project on iOS. If you want to run it on Android simply use the -android instead of the -ios sufix.

If you want to run the Angular demo simply use the demo-ng- prefix instead of demo-.

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