Configuration

See Also

• Configure a Widget: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core

See Also

• SelectBox - Create a User-Defined Item
• TagBox - Create a User-Defined Item

The value of this option will be passed to the accesskey attribute of the HTML element that underlies the widget.

This option is used when the widget is displayed on a platform whose guidelines include the active state change for widgets.

The option accepts the following values.

• instantly
  Applies values when they are selected.

• useButtons
  Applies values when a user clicks the "OK" button.

Use the EditorApplyValueMode enum to specify this option when the widget is used as an ASP.NET MVC 5 Control or a DevExtreme-Based ASP.NET Core Control. This enum accepts the following values: Instantly and UseButtons.

Built-in buttons should also be declared in this array. You can find an example in the following demo:

View Demo

If you use DevExtreme ASP.NET MVC Controls, refer to the Bind Controls to Data article.

The TagBox works with collections of objects or string, number, or boolean values.

Depending on your data source, bind the TagBox to data as follows. In each case, also specify the valueExpr, displayExpr, or both if the data source provides objects.

• Data Array
  Assign the array to the dataSource option.

• Read-Only Data in JSON Format
  Set the dataSource option to the URL of a JSON file or service that returns JSON data.

• OData
  Implement an ODataStore.

• Web API, PHP, MongoDB
  Use one of the following extensions to enable the server to process data according to the protocol DevExtreme widgets use:

  • DevExtreme.AspNet.Data
  • DevExtreme-PHP-Data
  • devextreme-query-mongodb

  Then, use the createStore method to configure access to the server on the client as shown below. This method is part of DevExtreme.AspNet.Data.

  jQuery

  JavaScript

  $(function() {
      let serviceUrl = "https://url/to/my/service";
      $("#tagBoxContainer").dxTagBox({
          // ...
          dataSource: DevExpress.data.AspNet.createStore({
              key: "ID",
              loadUrl: serviceUrl + "/GetAction",
              insertUrl: serviceUrl + "/InsertAction",
              updateUrl: serviceUrl + "/UpdateAction",
              deleteUrl: serviceUrl + "/DeleteAction"
          })
      })
  });

  Angular

  app.component.ts

  app.component.html

  app.module.ts

  import { Component } from '@angular/core';
  import CustomStore from 'devextreme/data/custom_store';
  import { createStore } from 'devextreme-aspnet-data-nojquery';
  
  @Component({
      selector: 'app-root',
      templateUrl: './app.component.html',
      styleUrls: ['./app.component.css']
  })
  export class AppComponent {
      store: CustomStore;
      constructor() {
          let serviceUrl = "https://url/to/my/service";
          this.store = createStore({
              key: "ID",
              loadUrl: serviceUrl + "/GetAction",
              insertUrl: serviceUrl + "/InsertAction",
              updateUrl: serviceUrl + "/UpdateAction",
              deleteUrl: serviceUrl + "/DeleteAction"
          })
      }
  }

  <dx-tag-box ...
      [dataSource]="store">
  </dx-tag-box>

  import { BrowserModule } from '@angular/platform-browser';
  import { NgModule } from '@angular/core';
  import { AppComponent } from './app.component';
  
  import { DxTagBoxModule } from 'devextreme-angular';
  
  @NgModule({
      declarations: [
          AppComponent
      ],
      imports: [
          BrowserModule,
          DxTagBoxModule
      ],
      providers: [],
      bootstrap: [AppComponent]
  })
  export class AppModule { }

  Vue

  App.vue

  <template> 
      <dx-tag-box ...
          :data-source="store" />
  </template>
  
  <script>
  import 'devextreme/dist/css/dx.common.css';
  import 'devextreme/dist/css/dx.light.css';
  
  import CustomStore from 'devextreme/data/custom_store';
  import { createStore } from 'devextreme-aspnet-data-nojquery';
  import { DxTagBox } from 'devextreme-vue/tag-box';
  
  export default {
      components: {
          DxTagBox
      },
      data() {
          const serviceUrl = "https://url/to/my/service";
          const store = createStore({
              key: "ID",
              loadUrl: serviceUrl + "/GetAction",
              insertUrl: serviceUrl + "/InsertAction",
              updateUrl: serviceUrl + "/UpdateAction",
              deleteUrl: serviceUrl + "/DeleteAction"
          });
          return {
              store
          }
      }
  }
  </script>

  React

  App.js

  import React from 'react';
  import 'devextreme/dist/css/dx.common.css';
  import 'devextreme/dist/css/dx.light.css';
  
  import CustomStore from 'devextreme/data/custom_store';
  import { createStore } from 'devextreme-aspnet-data-nojquery';
  import TagBox from 'devextreme-react/tag-box';
  
  const serviceUrl = "https://url/to/my/service";
  const store = createStore({
      key: "ID",
      loadUrl: serviceUrl + "/GetAction",
      insertUrl: serviceUrl + "/InsertAction",
      updateUrl: serviceUrl + "/UpdateAction",
      deleteUrl: serviceUrl + "/DeleteAction"
  });
  
  class App extends React.Component {
      render() {
          return (
              <TagBox ...
                  dataSource={store} />
          );
      }
  }
  export default App;

• Any other data source
  Implement a CustomStore.

Regardless of the data source on the input, the TagBox always wraps it in the DataSource object. This object allows you to sort, filter, group, and otherwise shape data. To get its instance, call the getDataSource() method.

Set this option to the name of a data field that provides displayed values...

displayExpr: "name"

... or to a function that returns the displayed value:

displayExpr: function(item) {
    // "item" can be null
    return item && 'ID: ' + item.id + ', Name: ' + item.name;
}

Leave this option unspecified or set it to this if the data source contains primitives.

See Also

• valueExpr

See Also

• SelectBox - Customize Drop-Down Button Demo
• Custom Templates

See Also

• Customize Item Appearance
• Custom Templates

When this option is true, make sure that all data source objects have the following structure:

var dataSource = [{
    key: "Group 1", // Group caption 
    items: [ // Items in the group
        { ... },
        { ... }
    ]
}, {
    // ...
}];

You can supply data to this structure using the DataSource object's group option.

See Also

• SelectBox - Grouped Items Demo
• TagBox - Grouped Items Demo
• SelectBox - Grouping
• TagBox - Grouping

View Demo

See Also

• Customize Group Headers
• Custom Templates

This option accepts a value of one of the following types:

• Number
  The height in pixels.

• String
  A CSS-accepted measurement of height. For example, "55px", "80%", "inherit".

• Function
  A function returning either of the above. For example:

  JavaScript

  height: function() {
      return window.innerHeight / 1.5;
  }

See Also

• Knockout Only - Validate a View Model
• Use a Custom Validation Engine
• validationErrors

If you need to update the widget items, reassign the entire items[] array as shown in the following example:

tagBoxInstance.option('items', newItems);

As an alternative to items, you can use the dataSource option. It accepts the DataSource object, whose underlying stores provide an API that allows you to update individual items without reassigning the entire item collection.

Particular fields in objects can control the widget's appearance. See Default Templates for more information.

See Also

• Customize Item Appearance
• Custom Templates

View Demo

See Also

• showMultiTagOnly
• onMultiTagPreparing

If the number of entered characters reaches the value assigned to this option, the widget does not allow you to enter any more characters.

Specify this option if the widget lies within an HTML form that will be submitted.

If you configure the widget as an ASP.NET MVC 5 Control or a DevExtreme-Based ASP.NET Core Control, use this option to bind the widget to a model property. If this model property contains Data Annotation validation attributes, you get the client-side validation enabled by default.

If data displayed by the widget is specified using a DataSource instance, the contentReady event fires each time the load() method of the DataSource instance is called as well as when widget content is ready. In this case, when you create the widget, the contentReady event is raised twice: when the widget's content is ready (at this moment, the widget does not display items) and when the DataSource is loaded (the widget displays the loaded items).

See Also

• SelectBox - Create a User-Defined Item
• TagBox - Create a User-Defined Item

See Also

• Get a Widget Instance in Angular | AngularJS | Knockout | Vue | React

View Demo

See Also

• Limit the Tag Count
• maxDisplayedTags
• showMultiTagOnly

View Demo

See Also

• showDropDownButton

When this option is set to true, the following applies:

• The editor's value cannot be changed using the UI.
• Built-in action buttons are invisible.

• Custom action buttons are visible but disabled. If a button should not be disabled, set its disabled option to false:

  jQuery

  index.js

  $(function() {
      $("#tagBoxContainer").dxTagBox({
          // ...
          buttons: [{
              name: "myCustomButton",
              location: "after",
              options: {
                  onClick: function(e) {
                      // ...
                  },
                  disabled: false
              }
          }]
      });
  });

  Angular

  app.component.html

  app.component.ts

  app.module.ts

  <dx-tag-box ... >
      <dxi-button
          name="myCustomButton"
          location="after"
          [options]="myCustomButtonConfig">
      </dxi-button>
  </dx-tag-box>

  import { Component } from '@angular/core';
  
  @Component({
      selector: 'app-root',
      templateUrl: './app.component.html',
      styleUrls: ['./app.component.css']
  })
  export class AppComponent {
      myCustomButtonConfig = {
          onClick: (e) => {
              // ...
          },
          disabled: false
      };
  }

  import { BrowserModule } from '@angular/platform-browser';
  import { NgModule } from '@angular/core';
  import { AppComponent } from './app.component';
  
  import { DxTagBoxModule } from 'devextreme-angular';
  
  @NgModule({
      declarations: [
          AppComponent
      ],
      imports: [
          BrowserModule,
          DxTagBoxModule
      ],
      providers: [ ],
      bootstrap: [AppComponent]
  })
  export class AppModule { }

  Vue

  App.vue

  <template>
      <dx-tag-box ... >
          <dx-tag-box-button
              name="myCustomButton"
              location="after"
              :options="myCustomButtonConfig"
          />
      </dx-tag-box>
  </template>
  
  <script>
  import 'devextreme/dist/css/dx.common.css';
  import 'devextreme/dist/css/dx.light.css';
  
  import DxTagBox, {
      DxButton as DxTagBoxButton
  } from 'devextreme-vue/tag-box';
  
  export default {
      components: {
          DxTagBox,
          DxTagBoxButton
      },
      data() {
          return {
              myCustomButtonConfig: {
                  onClick: (e) => {
                      // ...
                  },
                  disabled: false
              }
          }
      }
  }
  </script>

  React

  App.js

  import React from 'react';
  
  import 'devextreme/dist/css/dx.common.css';
  import 'devextreme/dist/css/dx.light.css';
  
  import TagBox, {
      Button as TagBoxButton
  } from 'devextreme-react/tag-box';
  
  class App extends React.Component {
      myCustomButtonConfig = {
          onClick: (e) => {
              // ...
          },
          disabled: false
      };
      render() {
          return (
              <TagBox>
                  <TagBoxButton
                      name="myCustomButton"
                      location="after"
                      options={this.myCustomButtonConfig}
                  />
              </TagBox>
          );
      }
  }
  export default App;

  You can also hide a custom action button when the widget becomes read-only. Set the button's visible option to false in the onOptionChanged function. To get the button, use the getButton(name) method:

  jQuery

  index.js

  $(function() {
      $("#tagBoxContainer").dxTagBox({
          // ...
          buttons: [{
              name: "myCustomButton",
              // ...
          }],
          onOptionChanged: function(e) {
              if(e.name == "readOnly") {
                  var myButton = e.component.getButton("myCustomButton");
                  myButton.option("visible", !e.value); // Hide the button when readOnly: true
              }
          }
      });
  });

  Angular

  app.component.html

  app.component.ts

  app.module.ts

  <dx-tag-box ...
      (onOptionChanged)="changeButtonState">
      <dxi-button
          name="myCustomButton"
          ...
      ></dxi-button>
  </dx-tag-box>

  import { Component } from '@angular/core';
  
  @Component({
      selector: 'app-root',
      templateUrl: './app.component.html',
      styleUrls: ['./app.component.css']
  })
  export class AppComponent {
      changeButtonState(e) {
          if(e.name == 'readOnly') {
              let myButton = e.component.getButton('myCustomButton');
              myButton.option('visible', !e.value); // Hide the button when readOnly: true
          }
      }
  }

  import { BrowserModule } from '@angular/platform-browser';
  import { NgModule } from '@angular/core';
  import { AppComponent } from './app.component';
  
  import { DxTagBoxModule } from 'devextreme-angular';
  
  @NgModule({
      declarations: [
          AppComponent
      ],
      imports: [
          BrowserModule,
          DxTagBoxModule
      ],
      providers: [ ],
      bootstrap: [AppComponent]
  })
  export class AppModule { }

  Vue

  App.vue

  <template>
      <dx-tag-box ...
          @option-changed="changeButtonState">
          <dx-tag-box-button
              name="myCustomButton"
              ...
          />
      </dx-tag-box>
  </template>
  
  <script>
  import 'devextreme/dist/css/dx.common.css';
  import 'devextreme/dist/css/dx.light.css';
  
  import DxTagBox, {
      DxButton as DxTagBoxButton
  } from 'devextreme-vue/tag-box';
  
  export default {
      components: {
          DxTagBox,
          DxTagBoxButton
      },
      data() {
          return {
              // ...
          }
      },
      methods: {
          changeButtonState(e) {
              if(e.name == 'readOnly') {
                  let myButton = e.component.getButton('myCustomButton');
                  myButton.option('visible', !e.value); // Hide the button when readOnly: true
              }
          }
      }
  }
  </script>

  React

  App.js

  import React from 'react';
  
  import 'devextreme/dist/css/dx.common.css';
  import 'devextreme/dist/css/dx.light.css';
  
  import TagBox, {
      Button as TagBoxButton
  } from 'devextreme-react/tag-box';
  
  class App extends React.Component {
      changeButtonState(e) {
          if(e.name == 'readOnly') {
              let myButton = e.component.getButton('myCustomButton');
              myButton.option('visible', !e.value); // Hide the button when readOnly: true
          }
      }
      render() {
          return (
              <TagBox ...
                  onOptionChanged={this.changeButtonState}>
                  <TagBoxButton
                      name="myCustomButton"
                      ...
                  />
              </TagBox>
          );
      }
  }
  export default App;

When this option is set to true, the widget text flows from right to left, and the layout of elements is reversed. To switch the entire application/site to the right-to-left representation, assign true to the rtlEnabled field of the object passed to the DevExpress.config(config) method.

DevExpress.config({
    rtlEnabled: true
});

See Also

• Right-to-Left Support Demo: DataGrid | Navigation Widgets | Editors

See Also

• Configure Search Parameters

In most cases, you should pass the name of a field by whose value data items are searched. If you need to search elements by several field values, assign an array of field names to this option.

searchExpr: ["firstName", "lastName"]

For more information on searching, refer to the Search Api section of the Data Layer article. For information on getters, refer to the Getters and Setters section of the Data Layer article.

Use the DropDownSearchMode enum to specify this option when the widget is used as an ASP.NET MVC 5 Control or a DevExtreme-Based ASP.NET Core Control. This enum accepts the following values: Contains and StartsWith.

The selectAllMode specifies how records should be selected on clicking the "Select All" check box. The following modes are available.

• 'page'
  Selects items on the currently rendered pages.

• 'allPages'
  Selects items on all pages.

The Clear button sets the widget value to null.

If this option is disabled, the widget does not display values until the number of typed characters exceeds the minSearchLength value, otherwise it displays all values regardless of the specified filtering condition.

See Also

• dropDownButtonTemplate

View Demo

See Also

• onMultiTagPreparing

The following styles are available:

Use the EditorStylingMode enum to specify this option when the widget is used as an ASP.NET MVC 5 Control or a DevExtreme-Based ASP.NET Core Control. This enum accepts the following values: Outlined, Underlined, and Filled.

You can also use the global editorStylingMode setting to specify how the text fields of all editors in your application are styled.

The value of this option will be passed to the tabindex attribute of the HTML element that underlies the widget.

This template replaces the default tag template. If you need to recreate the default tag appearance and specific template elements (such as the closing button) in your custom template, do so as follows:

$(function() {
    $("#tagBoxContainer").dxTagBox({
        // ...
        tagTemplate: function(tagData) {
            return $("<div />")
                .addClass("dx-tag-content")
                .append(
                    $("<span />").text("TAG CONTENT"),
                    $("<div />").addClass("dx-tag-remove-button")
                );
        }
    });
});

<dx-tag-box ...
    tagTemplate="tagTemplate">
    <div *dxTemplate="let tagData of 'tagTemplate'" class="dx-tag-content">
        TAG CONTENT
        <div class="dx-tag-remove-button"></div>
    </div>
</dx-tag-box>

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';

import { DxTagBoxModule } from 'devextreme-angular';

@NgModule({
    declarations: [
        AppComponent
    ],
    imports: [
        BrowserModule,
        DxTagBoxModule
    ],
    providers: [],
    bootstrap: [AppComponent]
})
export class AppModule { }

<template>
    <dx-tag-box ...
        tag-template="tagTemplate">
        <div slot="tagTemplate" slot-scope="{ tagData }" class="dx-tag-content">
            TAG CONTENT
            <div class="dx-tag-remove-button"></div>
        </div>
    </dx-tag-box>
</template>

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

import DxTagBox from 'devextreme-vue/tag-box';

export default {
    components: {
        DxTagBox
    },
    // ...
}
</script>

import React from 'react';

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

import TagBox from 'devextreme-react/tag-box';

const renderTag = (tagData) => {
    return (
        <div class="dx-tag-content">
            TAG CONTENT
            <div class="dx-tag-remove-button"></div>
        </div>
    );
}

class App extends React.Component {
    render() {
        return (
            <TagBox ...
                tagRender={renderTag}
            />
        );
    }
}
export default App;

See Also

• Customize Item Appearance
• Custom Templates

See Also

• isValid

The following option values are possible:

• auto
  The tooltip with the message is displayed when the editor is in focus.
• always
  The tooltip with the message is not hidden when the editor loses focus.

Use the ValidationMessageMode enum to specify this option when the widget is used as an ASP.NET MVC 5 Control or a DevExtreme-Based ASP.NET Core Control. This enum accepts the following values: Auto and Always.

The following table illustrates the validation status indicators:

validationStatus	Indicator
"pending"
"valid"
"invalid"

Pass an array of items to this option to select them.

Always set this option if the dataSource contains objects. Alternatively, you can specify the key in the store.

See Also

• displayExpr

This option accepts a value of one of the following types:

• Number
  The width in pixels.

• String
  A CSS-accepted measurement of width. For example, "55px", "80%", "auto", "inherit".

• Function
  A function returning either of the above. For example:

  JavaScript

  width: function() {
      return window.innerWidth / 1.5;
  }