DevExtreme Angular - Customize Item Appearance

For a minor customization of Lookup items, you can define specific fields in item data objects. For example, the following code generates three items: the first is not customized, the second is disabled and the third is hidden.

jQuery
JavaScript
$(function() {
    $("#lookupContainer").dxLookup({
        valueExpr: 'text',
        displayExpr: 'text',
        dataSource: [
            { text: "HD Video Player" },
            { text: "SuperHD Video Player", disabled: true },
            { text: "SuperPlasma 50", visible: false }
        ]
    });
});
Angular
HTML
TypeScript
<dx-lookup
    [dataSource]="lookupDataSource"
    valueExpr="text"
    displayExpr="text">
</dx-lookup>
import { DxLookupModule } from "devextreme-angular";
// ...
export class AppComponent {
    lookupDataSource = [
        { text: "HD Video Player" },
        { text: "SuperHD Video Player", disabled: true },
        { text: "SuperPlasma 50", visible: false }
    ];
}
@NgModule({
    imports: [
        // ...
        DxLookupModule
    ],
    // ...
})
Vue
<template>
    <DxLookup
        :data-source="dataSource"
        value-expr="text"
        display-expr="text"
    />
</template>

<script>
import 'devextreme/dist/css/dx.common.css';
import 'devextreme/dist/css/dx.light.css';

import { DxLookup } from 'devextreme-vue/lookup';

export default {
    components: {
        DxLookup
    },
    data() {
        return {
            dataSource: [
                { text: 'HD Video Player' },
                { text: 'SuperHD Video Player', disabled: true },
                { text: 'SuperPlasma 50', visible: false }
            ]
        };
    }
}
</script>
React
import React from 'react';
import 'devextreme/dist/css/dx.common.css';
import 'devextreme/dist/css/dx.light.css';

import { Lookup } from 'devextreme-react/lookup';

const dataSource = [
    { text: 'HD Video Player' },
    { text: 'SuperHD Video Player', disabled: true },
    { text: 'SuperPlasma 50', visible: false }
];

class App extends React.Component {
    render() {
        return (
            <Lookup
                dataSource={dataSource}
                valueExpr="text"
                displayExpr="text"
            />
        );
    }
}

export default App;

If you need a more flexible solution, define an itemTemplate. In Angular and Vue, you can declare it in the markup. In React, you can use a rendering function (shown in the code below) or component:

Angular
HTML
TypeScript
<dx-lookup
    [dataSource]="lookupDataSource"
    valueExpr="id"
    itemTemplate="lookupItem">
    <div *dxTemplate="let item of 'lookupItem'; let i = index">
        <img src="{{item.imgSrc}}"/>
        <div 
            style="display:inline-block" 
            [style.font-style]="i % 2 == 0 ? 'italic' : 'normal'">
            {{item.name}}
        </div>
    </div>
</dx-lookup>
import { DxLookupModule } from "devextreme-angular";
// ...
export class AppComponent {
    lookupDataSource = [{
        id: 1,
        name: "HD Video Player",
        imgSrc: "images/products/1-small.png"
    }, {
        id: 2,
        name: "UltraHD Player",
        imgSrc: "images/products/2-small.png"
    },
    // ...
    ];
}
@NgModule({
    imports: [
        // ...
        DxLookupModule
    ],
    // ...
})
Vue
<template>
    <DxLookup
        :data-source="dataSource"
        value-expr="id"
        item-template="item">
        <template #item="{ data, index }">
            <div>
                <img :src="data.imgSrc"/>
                <div 
                    :style="{'display': 'inline-block', 'font-style': index % 2 === 0 ? 'italic' : 'normal'}">
                    {{data.name}}
                </div>
            </div>
        </template>
    </DxLookup>
</template>

<script>
import 'devextreme/dist/css/dx.common.css';
import 'devextreme/dist/css/dx.light.css';

import { DxLookup } from 'devextreme-vue/lookup';

export default {
    components: {
        DxLookup
    },
    data() {
        return {
            dataSource: [{
                id: 1,
                name: "HD Video Player",
                imgSrc: "images/products/1-small.png"
            }, {
                id: 2,
                name: "UltraHD Player",
                imgSrc: "images/products/2-small.png"
            },
            // ...
            ]
        };
    }
}
</script>
React
import React from 'react';
import 'devextreme/dist/css/dx.common.css';
import 'devextreme/dist/css/dx.light.css';

import { Lookup } from 'devextreme-react/lookup';

const dataSource = [{
    id: 1,
    name: "HD Video Player",
    imgSrc: "images/products/1-small.png"
}, {
    id: 2,
    name: "UltraHD Player",
    imgSrc: "images/products/2-small.png"
},
// ...
];

const renderItem = (data, index) => {
    return (
        <div>
            <img src={data.imgSrc}/>
            <div 
                style={{display: 'inline-block', fontStyle: index % 2 === 0 ? 'italic' : 'normal'}}>
                {data.name}
            </div>
        </div>      
    );
};

class App extends React.Component {
    render() {
        return (
            <Lookup
                dataSource={dataSource}
                valueExpr="id"
                itemRender={renderItem}
            />
        );
    }
}

export default App;

If you use jQuery alone, use DOM manipulation methods to combine the HTML markup for items. To apply this markup, use the itemTemplate callback function as shown in the following code.

JavaScript
const lookupData = [{
    id: 1,
    name: "HD Video Player",
    imgSrc: "images/products/1-small.png"
}, {
    id: 2,
    name: "UltraHD Player",
    imgSrc: "images/products/2-small.png"
},
// ...
];

$(function() {
    $("#lookupContainer").dxLookup({
        dataSource: lookupData,
        valueExpr: 'id',
        displayExpr: 'name',
        itemTemplate: function (itemData, itemIndex, itemElement) {
            return $("<div />").append(
                        $("<img />").attr("src", itemData.imgSrc),
                        $("<p />").text(itemData.name)
                                .css("display", "inline-block")
                                .css("font-style", (itemIndex % 2 == 0) ? "italic" : "normal")
                    );
        }
    });
});

You can also customize an individual Lookup item. For this purpose, declare a template for this item as a script and pass its id to the template field.

HTML
JavaScript
<script id="individualTemplate" type="text/html">
    <!-- ... -->
</script>
const lookupData = [
    { text: "SuperHD Player"},
    { text: "HD Video Player", template: $("#individualTemplate") },
    // ...
];

Using similar techniques, you can customize the input field of the Lookup. The template for it should be assigned to the fieldTemplate option.

jQuery
JavaScript
$(function() {
    $("#lookupContainer").dxLookup({
        dataSource: lookupData,
        valueExpr: 'id',
        displayExpr: 'name',
        fieldTemplate: function(itemData, itemElement) {
            return $("<div />").append(
                $("<img />").attr("src", itemData.imgSrc)
            );
        }
    });
});
Angular
HTML
TypeScript
<dx-lookup
    [dataSource]="lookupDataSource"
    valueExpr="id"
    displayExpr="name"
    fieldTemplate="inputField">
    <div *dxTemplate="let item of 'inputField'">
        <img src="{{item.imgSrc}}" />
    </div>
</dx-lookup>
import { DxLookupModule } from "devextreme-angular";
// ...
export class AppComponent {
    lookupDataSource = [{
        id: 1,
        name: "HD Video Player",
        imgSrc: "images/products/1-small.png"
    }, {
        id: 2,
        name: "UltraHD Player",
        imgSrc: "images/products/2-small.png"
    },
    // ...
    ];
}
@NgModule({
    imports: [
        // ...
        DxLookupModule
    ],
    // ...
})
Vue
<template>
    <DxLookup
        :data-source="dataSource"
        value-expr="id"
        display-expr="name"
        field-template="fieldInput">
        <template #fieldInput="{ data }">
            <img :src="data && data.imgSrc"/>
        </template>
    </DxLookup>
</template>

<script>
import 'devextreme/dist/css/dx.common.css';
import 'devextreme/dist/css/dx.light.css';

import { DxLookup } from 'devextreme-vue/lookup';

export default {
    components: {
        DxLookup
    },
    data() {
        return {
            dataSource: [{
                id: 1,
                name: "HD Video Player",
                imgSrc: "images/products/1-small.png"
            }, {
                id: 2,
                name: "UltraHD Player",
                imgSrc: "images/products/2-small.png"
            },
            // ...
            ]
        };
    }
}
</script>
React
import React from 'react';
import 'devextreme/dist/css/dx.common.css';
import 'devextreme/dist/css/dx.light.css';

import { Lookup } from 'devextreme-react/lookup';

const dataSource = [{
    id: 1,
    name: "HD Video Player",
    imgSrc: "images/products/1-small.png"
}, {
    id: 2,
    name: "UltraHD Player",
    imgSrc: "images/products/2-small.png"
},
// ...
];

const renderField = (data) => {
    return (
        <img src={data && data.imgSrc}/>
    );
};

class App extends React.Component {
    render() {
        return (
            <Lookup
                dataSource={dataSource}
                valueExpr="id"
                displayExpr="name"
                fieldRender={renderField}
            />
        );
    }
}

export default App;

View Demo

In addition, you can use a 3rd-party template engine to perform the needed customizations. For more information, see the 3rd-Party Template Engines article.

See Also