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Leaf Item in Angular TreeMap component

20 Apr 2021 / 4 minutes to read

The leaf item defines a visualized data element. Leaf item does not contain child nodes, but contains parent node if it specifies the levels in tree map. Leaf nodes can be customized.

Leaf label

Label is represented by item name or value. Label will be appeared by specifying the [labelPath] property. You can customize the label style using the [labelStyle] property.

Source
Preview
app.component.ts
app.module.ts
main.ts
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import { Component } from '@angular/core';

@Component({
    selector: 'app-container',
    template: `<ejs-treemap id='container' style='display: block;'  [dataSource]='data' weightValuePath='GDP'
    [leafItemSettings]='leafItemSettings' >
    </ejs-treemap>`
})
export class AppComponent {
    public data: object[] = [
    {State:"United States", GDP:17946, percentage:11.08, Rank:1},
    {State:"China", GDP:10866, percentage: 28.42, Rank:2},
    {State:"Japan", GDP:4123, percentage:-30.78, Rank:3},
    {State:"Germany", GDP:3355, percentage:-5.19, Rank:4},
    {State:"United Kingdom", GDP:2848, percentage:8.28, Rank:5},
    {State:"France", GDP:2421, percentage:-9.69, Rank:6},
    {State:"India", GDP:2073, percentage:13.65, Rank:7},
    {State:"Italy", GDP:1814, percentage:-12.45, Rank:8},
    {State:"Brazil", GDP:1774, percentage:-27.88, Rank:9},
    {State:"Canada", GDP:1550, percentage:-15.02, Rank:10}
];
    public leafItemSettings: object= {
            labelPath: 'State',
            labelStyle: {
                color: '#000000'
            },
            border: {
                color: '#000000',
                width: 0.5
            }
            }
}
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import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { TreeMapModule, TreeMapLegendService, TreeMapTooltipService, TreeMapAllModule } from '@syncfusion/ej2-angular-treemap';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, TreeMapModule, TreeMapAllModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
	providers: [TreeMapLegendService, TreeMapTooltipService]
})
export class AppModule { }
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import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

Label position and format

You can position the label using the [labelPosition] property and format the text by specifying data values using the [labelFormat] property.

Source
Preview
app.component.ts
app.module.ts
main.ts
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import { Component } from '@angular/core';

@Component({
    selector: 'app-container',
    template: `<ejs-treemap id='container' style='display: block;'  [dataSource]='data' weightValuePath='GDP'
    [leafItemSettings]='leafItemSettings' >
    </ejs-treemap>`
})
export class AppComponent {
    public data: object[] = [
    {State:"United States", GDP:17946, percentage:11.08, Rank:1},
    {State:"China", GDP:10866, percentage: 28.42, Rank:2},
    {State:"Japan", GDP:4123, percentage:-30.78, Rank:3},
    {State:"Germany", GDP:3355, percentage:-5.19, Rank:4},
    {State:"United Kingdom", GDP:2848, percentage:8.28, Rank:5},
    {State:"France", GDP:2421, percentage:-9.69, Rank:6},
    {State:"India", GDP:2073, percentage:13.65, Rank:7},
    {State:"Italy", GDP:1814, percentage:-12.45, Rank:8},
    {State:"Brazil", GDP:1774, percentage:-27.88, Rank:9},
    {State:"Canada", GDP:1550, percentage:-15.02, Rank:10}
];
   public leafItemSettings: object= {
            labelPath: 'State',
            labelPosition:'TopCenter',
            labelFormat: '${State}<br>${GDP} Trillion<br>(${percentage} %)',
        };
}
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import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { TreeMapModule, TreeMapLegendService, TreeMapTooltipService, TreeMapAllModule } from '@syncfusion/ej2-angular-treemap';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, TreeMapModule, TreeMapAllModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
	providers: [TreeMapLegendService, TreeMapTooltipService]
})
export class AppModule { }
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import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

Label template and position

You can display both text and image in leaf node using the [template] property, which can be placed anywhere in node using the [templatePosition] property.

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import { Component } from '@angular/core';

@Component({
    selector: 'app-container',
    template: `<ejs-treemap id='container' style='display: block;'  [dataSource]='data' weightValuePath='Gold'
    [leafItemSettings]='leafItemSettings' >
    </ejs-treemap>`
})
export class AppComponent {
    public data: object[] = [
    { Sport: "Swimming", Gold: 16, GameImage: 'Swimming.svg', ItemHeight: "180px", ItemWidth: '180px' },
    { Sport: "Athletics", Gold: 13, GameImage: 'Athletics.svg', ItemHeight: "70px", ItemWidth: '70px' },
    { Sport: "Gymnastics", Gold: 4, GameImage: 'Gymnastics.svg', ItemHeight: "80px", ItemWidth: '80px' },
    { Sport: "Cycling", Gold: 2, GameImage: 'Cycling.svg', ItemHeight: "50px", ItemWidth: '50px' },
    { Sport: "Wrestling", Gold: 2, GameImage: 'Wrestling.svg', ItemHeight: "60px", ItemWidth: '50px' },
    { Sport: "Basketball", Gold: 2, GameImage: 'Basketball.svg', ItemHeight: "50px", ItemWidth: '50px' },
    { Sport: "Boxing", Gold: 1, GameImage: 'Boxing.svg', ItemHeight: "40px", ItemWidth: '30px' },
    { Sport: "Tennis", Gold: 1, GameImage: 'Tennis.svg', ItemHeight: "40px", ItemWidth: '40px' },
    { Sport: "Judo", Gold: 1, GameImage: 'Judo.svg', ItemHeight: "40px", ItemWidth: '40px' },
    { Sport: "Rowing", Gold: 1, GameImage: 'Rowing.svg', ItemHeight: "40px", ItemWidth: '40px' },
    { Sport: "Shooting", Gold: 1, GameImage: 'Shooting.svg', ItemHeight: "40px", ItemWidth: '40px' },
    { Sport: "Triathlon", Gold: 1, GameImage: 'Triathlon.svg', ItemHeight: "40px", ItemWidth: '40px' },
    { Sport: "Water polo", Gold: 1, GameImage: 'Water polo.svg', ItemHeight: "40px", ItemWidth: '40px' }
];
   public leafItemSettings: object ={
            labelPath: 'Sport',
            fill: '#993399',
            templatePosition: 'Center',
            labelTemplate: '<div style="pointer-events: none;"><img src="src/treemap/image/{{:GameImage}}"' +
            ' style="height:{{:ItemHeight}};width:{{:ItemWidth}};"></img></div>'
        }
}

Item gap

The [gap] property is used to separate an item from another item. Each item rectangle is split into equal space with specified gap.

Source
Preview
app.component.ts
app.module.ts
main.ts
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import { Component } from '@angular/core';

@Component({
    selector: 'app-container',
    template: `<ejs-treemap id='container' style='display: block;'  [dataSource]='data' weightValuePath='GDP'
    [leafItemSettings]='leafItemSettings' >
    </ejs-treemap>`
})
export class AppComponent {
    public data: object[] = [
    {State:"United States", GDP:17946, percentage:11.08, Rank:1},
    {State:"China", GDP:10866, percentage: 28.42, Rank:2},
    {State:"Japan", GDP:4123, percentage:-30.78, Rank:3},
    {State:"Germany", GDP:3355, percentage:-5.19, Rank:4},
    {State:"United Kingdom", GDP:2848, percentage:8.28, Rank:5},
    {State:"France", GDP:2421, percentage:-9.69, Rank:6},
    {State:"India", GDP:2073, percentage:13.65, Rank:7},
    {State:"Italy", GDP:1814, percentage:-12.45, Rank:8},
    {State:"Brazil", GDP:1774, percentage:-27.88, Rank:9},
    {State:"Canada", GDP:1550, percentage:-15.02, Rank:10}
];
   public leafItemSettings: object= {
            labelPath: 'State',
            gap:20
        };
}
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import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { TreeMapModule, TreeMapLegendService, TreeMapTooltipService, TreeMapAllModule } from '@syncfusion/ej2-angular-treemap';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, TreeMapModule, TreeMapAllModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
	providers: [TreeMapLegendService, TreeMapTooltipService]
})
export class AppModule { }
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import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);