Create a User-Defined Item

A user can select existing values and add new values to the TagBox. To enable this feature, assign true to the acceptCustomValue option. Note that you should implement the onCustomItemCreating handler to create a new data source entry.

HTML
JavaScript
<div id="tagBoxContainer"></div>
var tagBoxData = new DevExpress.data.DataSource({
    store: [
        { id: 1, firstName: "Andrew" },
        { id: 2, firstName: "Nancy" },
        { id: 3, firstName: "Steven" }
    ]
});

$("#tagBoxContainer").dxTagBox({
    dataSource: tagBoxData,
    valueExpr: 'id',
    displayExpr: 'firstName',
    acceptCustomValue: true,
    onCustomItemCreating: function(e){
        // Generates a new 'id'
        var nextId = Math.max.apply(Math, tagBoxData.items().map(function(c) { return c.id; })) + 1;
        // Creates a new entry
        e.customItem = { id: nextId, firstName: e.text };
        // Adds the entry to the data source
        tagBoxData.store().insert(e.customItem);
        // Reloads the data source
        tagBoxData.reload();
    }
});
See Also