Angular TreeView - Customize Node Appearance

For minor customization of nodes, you can define specific fields in node data objects. For example, the following code adds an icon to each node.

jQuery
JavaScript
var hierarchicalData = [{
    id: '1',
    text: 'Fruits',
    icon: '/pics/fruits.ico',
    items: [
        { id: '1_1', text: 'Apples', icon: '/pics/fruits/apple.ico' },
        { id: '1_2', text: 'Oranges', icon: '/pics/fruits/orange.ico' }
    ]
}, {
    id: '2',
    text: 'Vegetables',
    icon: '/pics/vegetables.ico',
    items: [
        { id: '2_1', text: 'Cucumbers', icon: '/pics/vegetables/cucumber.ico' },
        { id: '2_2', text: 'Tomatoes', icon: '/pics/vegetables/tomato.ico' }
    ]
}]

$(function() {
    $("#treeViewContainer").dxTreeView({
        dataSource: hierarchicalData
    });
});
Angular
HTML
TypeScript
<dx-tree-view
    [dataSource]="hierarchicalData" >
</dx-tree-view>
import { DxTreeViewModule } from "devextreme-angular";
// ...
export class AppComponent {
    hierarchicalData = [{
        id: '1',
        text: 'Fruits',
        icon: '/pics/fruits.ico',
        items: [
            { id: '1_1', text: 'Apples', icon: '/pics/fruits/apple.ico' },
            { id: '1_2', text: 'Oranges', icon: '/pics/fruits/orange.ico' }
        ]
    }, {
        id: '2',
        text: 'Vegetables',
        icon: '/pics/vegetables.ico',
        items: [
            { id: '2_1', text: 'Cucumbers', icon: '/pics/vegetables/cucumber.ico' },
            { id: '2_2', text: 'Tomatoes', icon: '/pics/vegetables/tomato.ico' }
        ]
    }];
}
@NgModule({
    imports: [
        // ...
        DxTreeViewModule
    ],
    // ...
})
Vue
App.vue
<template>
    <DxTreeView
        :items="hierarchicalData" 
    />
</template>
<script>
import 'devextreme/dist/css/dx.light.css';

import { DxTreeView } from 'devextreme-vue/tree-view';

const hierarchicalData = [{
    id: '1',
    text: 'Fruits',
    icon: '/pics/fruits.ico',
    items: [
        { id: '1_1', text: 'Apples', icon: '/pics/fruits/apple.ico' },
        { id: '1_2', text: 'Oranges', icon: '/pics/fruits/orange.ico' }
    ]
}, {
    id: '2',
    text: 'Vegetables',
    icon: '/pics/vegetables.ico',
    items: [
        { id: '2_1', text: 'Cucumbers', icon: '/pics/vegetables/cucumber.ico' },
        { id: '2_2', text: 'Tomatoes', icon: '/pics/vegetables/tomato.ico' }
    ]
}];

export default {
    components: {
        DxTreeView
    },
    data() {
        return {
            hierarchicalData
        };
    },
};
</script>
React
App.js
import React from 'react';

import 'devextreme/dist/css/dx.light.css';

import TreeView from 'devextreme-react/tree-view';

const hierarchicalData = [{
    id: '1',
    text: 'Fruits',
    icon: '/pics/fruits.ico',
    items: [
        { id: '1_1', text: 'Apples', icon: '/pics/fruits/apple.ico' },
        { id: '1_2', text: 'Oranges', icon: '/pics/fruits/orange.ico' }
    ]
}, {
    id: '2',
    text: 'Vegetables',
    icon: '/pics/vegetables.ico',
    items: [
        { id: '2_1', text: 'Cucumbers', icon: '/pics/vegetables/cucumber.ico' },
        { id: '2_2', text: 'Tomatoes', icon: '/pics/vegetables/tomato.ico' }
    ]
}];

class App extends React.Component {
    render() {
        return (
            <TreeView
                items={hierarchicalData} />
        );
    }
}

export default App;

If you need a more flexible solution, define an itemTemplate.

jQuery
JavaScript
$(function() {
    $("#treeViewContainer").dxTreeView({
        dataSource: treeViewData,
        itemTemplate: function (itemData, itemIndex, itemElement) {
            itemElement.append("<i>" + itemData.text + "</i>");
        }
    });
});
Angular
HTML
TypeScript
<dx-tree-view
    [dataSource]="hierarchicalData"
    itemTemplate="itemTemplate">
    <div *dxTemplate="let itemObj of 'itemTemplate'">
        <i>{{itemObj.text}}</i>
    </div>
</dx-tree-view>
import { DxTreeViewModule } from "devextreme-angular";
// ...
export class AppComponent {
    hierarchicalData = [{
        id: '1',
        text: 'Fruits',
        items: [
            { id: '1_1', text: 'Apples' },
            { id: '1_2', text: 'Oranges' }
        ]
    }, {
        id: '2',
        text: 'Vegetables',
        items: [
            { id: '2_1', text: 'Cucumbers' },
            { id: '2_2', text: 'Tomatoes' }
        ]
    }];
}
@NgModule({
    imports: [
        // ...
        DxTreeViewModule
    ],
    // ...
})
Vue
App.vue
<template>
    <DxTreeView
        :items="hierarchicalData">
        <template #item="item">
            <i>{{ item.data.text }}</i>
        </template>           
    </DxTreeView>    
</template>
<script>
import 'devextreme/dist/css/dx.light.css';

import { DxTreeView } from 'devextreme-vue/tree-view';

const hierarchicalData = [{
    id: '1',
    text: 'Fruits',
    items: [
        { id: '1_1', text: 'Apples' },
        { id: '1_2', text: 'Oranges' }
    ]
}, {
    id: '2',
    text: 'Vegetables',
    items: [
        { id: '2_1', text: 'Cucumbers' },
        { id: '2_2', text: 'Tomatoes' }
    ]
}];

export default {
    components: {
        DxTreeView
    },
    data() {
        return {
            hierarchicalData
        };
    },
};
</script>
React
App.js
import React from 'react';

import 'devextreme/dist/css/dx.light.css';

import TreeView from 'devextreme-react/tree-view';

const hierarchicalData = [{
    id: '1',
    text: 'Fruits',
    items: [
        { id: '1_1', text: 'Apples' },
        { id: '1_2', text: 'Oranges' }
    ]
}, {
    id: '2',
    text: 'Vegetables',
    items: [
        { id: '2_1', text: 'Cucumbers' },
        { id: '2_2', text: 'Tomatoes' }
    ]
}];

class App extends React.Component {
    render() {
        return (
            <TreeView
                itemRender={this.renderTreeViewItem}
                items={hierarchicalData} />
        );
    }

    renderTreeViewItem(item) {
        return (
            <i>{item.text}</i>
        );
    }
}

export default App;
jQuery

You can also customize individual nodes. Declare them as scripts and reference them in the template property or assign a customization function straight to this property.

HTML
JavaScript
<div id="treeViewContainer"></div>
<script id="individualItemTemplate" type="text/html">
    <p>Oranges</p>
</script>
var treeViewData = [{
    id: '1',
    text: 'Fruits',
    items: [{
        template: function() {
            return "<i>Apples</i>";
        }
    }, {
        template: $("#individualItemTemplate")
    }
    ]
},
// ...
];
Angular

You can also customize individual nodes. Declare them using the dxItem component.

HTML
TypeScript
<dx-tree-view>
    <dxi-item>
        <i>Apples</i>
    </dxi-item>
    <dxi-item>
        <p>Oranges</p>
    </dxi-item>
</dx-tree-view>
import { DxTreeViewModule } from "devextreme-angular";
// ...
export class AppComponent {
    // ...
}
@NgModule({
    imports: [
        // ...
        DxTreeViewModule
    ],
    // ...
})
Vue

You can also customize individual nodes. Declare them using the dxItem component.

App.vue
<template>
    <DxTreeView>
        <DxItem>
            <template #default>
                <i>Apples</i>
            </template>
        </DxItem>
        <DxItem>
            <template #default>
                <p>Oranges</p>
            </template>
        </DxItem>
    </DxTreeView>
</template>
<script>
import 'devextreme/dist/css/dx.light.css';

import { DxTreeView, DxItem } from 'devextreme-vue/tree-view';

export default {
    components: {
        DxTreeView,
        DxItem
    }
};
</script>
React

You can also customize individual nodes. Declare them using the dxItem component.

App.js
import React from 'react';

import 'devextreme/dist/css/dx.light.css';

import TreeView, { Item } from 'devextreme-react/tree-view';

class App extends React.Component {
    render() {
        return (
            <TreeView>
                <Item>
                    <i>Apples</i>
                </Item>
                <Item>
                    <p>Oranges</p>
                </Item>
            </TreeView>
        );
    }
}

export default App;
See Also