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CustomValue

The MultiSelect allows user to add a new non-present option to the component value when allowCustomValue is enabled. while selecting the new custom value customValueSelection event will be triggered.

The following sample demonstrates configuration of custom value support with the MultiSelect component.

Source
Preview
app.ts
index.html
import { MultiSelect } from '@syncfusion/ej2-dropdowns';

//define the array of complex data
let sportsData: { [key: string]: Object }[] = [
    { id: 'game1', sports: 'Badminton' },
    { id: 'game2', sports: 'Football' },
    { id: 'game3', sports: 'Tennis' }
];

//initiate the MultiSelect
let msObject: MultiSelect = new MultiSelect({
    // bind the sports Data to datasource property
    dataSource: sportsData,
    // maps the appropriate column to fields property
    fields: { text: 'sports', value: 'id' },
    //set the placeholder to MultiSelect input
    placeholder:"Select games",
    //enable custom Value option with multislect
    allowCustomValue:true
});
// render initialized multiSelect
msObject.appendTo('#select');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2 MultiSelect</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="styles.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-dropdowns/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>LOADING....</div>
    <div id='container' style="margin:0 auto; width:250px;">
        <br>
        <!--element which is going to render the MultiSelect-->
        <input type="text" tabindex="1" id='select' />
    </div>
</body>

</html>