Angular Form Properties
An object defining configuration options for the Form widget.
See Also
- Configure a Widget: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core
accessKey
Specifies the shortcut key that sets focus on the widget.
The value of this option will be passed to the accesskey
attribute of the HTML element that underlies the widget.
activeStateEnabled
Specifies whether or not the widget changes its state when interacting with a user.
This option is used when the widget is displayed on a platform whose guidelines include the active state change for widgets.
alignItemLabels
Specifies whether or not all root item labels are aligned.
alignItemLabelsInAllGroups
Specifies whether or not item labels in all groups are aligned.
colCount
The count of columns in the form layout.
For extra small screens, this option always equals 1 to make the widget adaptive. To override this logic, specify the colCountByScreen option.
jQuery
$(function() { $("#formContainer").dxForm({ // ... colCountByScreen: { xs: 2 } }); });
Angular
<dx-form ... > <dxo-col-count-by-screen [xs]="2"></dxo-col-count-by-screen> </dx-form>
import { DxFormModule } from "devextreme-angular"; // ... export class AppComponent { // ... } @NgModule({ imports: [ // ... DxFormModule ], // ... })
Use the Mode
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
.
See Also
colCountByScreen
Specifies dependency between the screen factor and the count of columns in the form layout.
customizeItem
Specifies a function that customizes a form item after it has been created.
The item's object.
If you did not define form items using the items option, the Form widget creates them automatically according to the structure of an object passed to the formData option. The customizeItem option enables you to modify options of each generated item before this item is rendered. Each generated item passed to this function as an argument has a Simple Item structure.
If the items option contains definition for form items, you usually do not need to pass a function to the customizeItem option because you can customize items before passing them to the items option. However, if you assign a function to this option, it will be called for each item. In this case, an item can have structure corresponding to any of the following item types.
Simple
A standard item consisting of a label and an editor widget used to specify a value of the associated data field.Group
An item representing a container of other form items.Tabbed
An item representing a tabbed container of other form items.Empty
An empty item used to add a space between neighboring form items.
See Also
elementAttr
Specifies the attributes to be attached to the widget's root element.
jQuery
$(function(){ $("#formContainer").dxForm({ // ... elementAttr: { id: "elementId", class: "class-name" } }); });
Angular
<dx-form ... [elementAttr]="{ id: 'elementId', class: 'class-name' }"> </dx-form>
import { DxFormModule } from "devextreme-angular"; // ... export class AppComponent { // ... } @NgModule({ imports: [ // ... DxFormModule ], // ... })
Vue
<template> <DxForm ... :element-attr="formAttributes"> </DxForm> </template> <script> import DxForm from 'devextreme-vue/form'; export default { components: { DxForm }, data() { return { formAttributes: { id: 'elementId', class: 'class-name' } } } } </script>
React
import React from 'react'; import Form from 'devextreme-react/form'; class App extends React.Component { formAttributes = { id: 'elementId', class: 'class-name' } render() { return ( <Form ... elementAttr={this.formAttributes}> </Form> ); } } export default App;
focusStateEnabled
Specifies whether the widget can be focused using keyboard navigation.
height
Specifies the widget's height.
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:JavaScriptheight: function() { return window.innerHeight / 1.5; }
hint
Specifies text for a hint that appears when a user pauses on the widget.
hoverStateEnabled
Specifies whether the widget changes its state when a user pauses on it.
items
Holds an array of form items.
Array<Simple Form Item | Group Form Item | Tabbed Form Item | Empty Form Item | Button Form Item>
Simple Items Demo Grouped and Tabbed Items Demo Button Item Demo
When using the widget as an ASP.NET MVC 5 Control or a DevExtreme-Based ASP.NET Core Control, declare the items as follows:
@(Html.DevExtreme().Form() .FormData(Model.Data) .Items(rootItems => { rootItems.AddSimple().DataField("EmployeeID"); // Adds a simple item rootItems.AddEmpty(); // Adds an empty item rootItems.AddGroup().Caption("General Info") // Adds a group item .Items(groupItems => { groupItems.AddSimple().DataField("FirstName"); // ... }); rootItems.AddTabbed() // Adds a tabbed item .Tabs(tabs => { tabs.Add().Title("Address") .Items(addressItems => { addressItems.AddSimple().DataField("Country"); // ... }); tabs.Add().Title("Phone") // ... }); rootItems.AddButton() // Adds a button item .ButtonOptions(b => b.Text("Register") .Type(ButtonType.Success) .UseSubmitBehavior(true) ); }) )
@(Html.DevExtreme().Form() _ .FormData(Model.Data) _ .Items(Sub(rootItems) rootItems.AddSimple().DataField("EmployeeID") ' Adds a simple item rootItems.AddEmpty() ' Adds an empty item ' Adds a group item rootItems.AddGroup().Caption("General Info") _ .Items(Sub(groupItems) groupItems.AddSimple().DataField("FirstName") ' ... End Sub) ' Adds a tabbed item rootItems.AddTabbed() _ .Tabs(Sub(tabs) tabs.Add().Title("Address") _ .Items(Sub(addressItems) addressItems.AddSimple().DataField("Country") ' ... End Sub) tabs.Add().Title("Phone") ' ... End Sub) ' Adds a button item rootItems.AddButton() _ .ButtonOptions(Sub(b) b.Text("Register") _ .Type(ButtonType.Success) _ .UseSubmitBehavior(True) End Sub) End Sub) )
labelLocation
Specifies the location of a label against the editor.
Use the FormLabelLocation
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: Left
, Right
, and Top
.
See Also
minColWidth
The minimum column width used for calculating column count in the form layout.
This option makes sense only if the colCount option is set to "auto".
onContentReady
A function that is executed when the widget's content is ready and each time the content is changed.
Information about the event.
Name | Type | Description |
---|---|---|
component |
The widget's instance. |
|
element |
The widget's container. It is an HTML Element or a jQuery Element when you use jQuery. |
|
model |
Model data. Available only when using Knockout. |
onDisposing
A function that is executed before the widget is disposed of.
Information about the event.
Name | Type | Description |
---|---|---|
component |
The widget's instance. |
|
element |
The widget's container. It is an HTML Element or a jQuery Element when you use jQuery. |
|
model |
Model data. Available only if you use Knockout. |
onEditorEnterKey
A function that is executed when the Enter key has been pressed while an editor is focused.
Information about the event.
Name | Type | Description |
---|---|---|
component |
The widget's instance. |
|
dataField |
The path to the formData object field associated with the current editor. |
|
element |
The widget's container. It is an HTML Element or a jQuery Element when you use jQuery. |
|
model |
Model data. Available only if Knockout is used. |
onFieldDataChanged
A function that is executed when the value of a formData object field is changed.
Information about the event.
Name | Type | Description |
---|---|---|
component |
The widget's instance. |
|
dataField |
The path to the formData object field whose value has been changed. |
|
element |
The widget's container. It is an HTML Element or a jQuery Element when you use jQuery. |
|
model |
Model data. Available only if Knockout is used. |
|
value |
The field's new value. |
See Also
onInitialized
A function used in JavaScript frameworks to save the widget instance.
Information about the event.
Name | Type | Description |
---|---|---|
component |
The widget's instance. |
|
element |
The widget's container. It is an HTML Element or a jQuery Element when you use jQuery. |
onOptionChanged
A function that is executed after a widget option is changed.
Information about the event.
Name | Type | Description |
---|---|---|
model |
Model data. Available only if you use Knockout. |
|
fullName |
The path to the modified option that includes all parent options. |
|
element |
The widget's container. It is an HTML Element or a jQuery Element when you use jQuery. |
|
component |
The widget's instance. |
|
name |
The modified option if it belongs to the first level. Otherwise, the first-level option it is nested into. |
|
value | any |
The modified option's new value. |
readOnly
Specifies whether all editors on the form are read-only. Applies only to non-templated items.
requiredMessage
Specifies the message that is shown for end-users if a required field value is not specified.
rtlEnabled
Switches the widget to a right-to-left representation.
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
screenByWidth
Specifies a function that categorizes screens by their width.
The widget uses the following size qualifiers to categorize screens by width:
Size Qualifier | Description |
---|---|
xs | Stands for "extra small". Screens with width less than 768 pixels. |
sm | Stands for "small". Screens with width between 768 and 992 pixels. |
md | Stands for "medium". Screens with width between 992 and 1200 pixels. |
lg | Stands for "large". Screens with width more than 1200 pixels. |
Implement the screenByWidth function to change the relation between a size qualifier and screen width. This function accepts the screen width and should return a size qualifier. The following code shows the function's default implementation that you can customize:
jQuery
$(function() { $("#formContainer").dxForm({ // ... screenByWidth: function(width) { if (width < 768) return "xs"; if (width < 992) return "sm"; if (width < 1200) return "md"; return "lg"; } }); });
Angular
import { DxFormModule } from "devextreme-angular"; // ... export class AppComponent { // ... getSizeQualifier(width) { if (width < 768) return "xs"; if (width < 992) return "sm"; if (width < 1200) return "md"; return "lg"; } } @NgModule({ imports: [ // ... DxFormModule ], // ... })
<dx-form ... [screenByWidth]="getSizeQualifier"> </dx-form>
scrollingEnabled
A Boolean value specifying whether to enable or disable form scrolling.
showColonAfterLabel
Specifies whether or not a colon is displayed at the end of form labels.
showOptionalMark
Specifies whether or not the optional mark is displayed for optional fields.
See Also
showRequiredMark
Specifies whether or not the required mark is displayed for required fields.
See Also
showValidationSummary
Specifies whether or not the total validation summary is displayed on the form.
tabIndex
Specifies the number of the element when the Tab key is used for navigating.
The value of this option will be passed to the tabindex
attribute of the HTML element that underlies the widget.
validationGroup
Gives a name to the internal validation group.
In some cases, the Form editors should be validated by the Button widget. By default, these editors are collected in an unnamed validation group, what makes it impossible for the Button to validate them. In this case, give this validation group a name using the validationGroup option of the Form widget. Also, pass the same name to the validationGroup option of the Button widget.
$(function () { $("#formContainer").dxForm({ // ... validationGroup: "groupName" }); $("#buttonContainer").dxButton({ // ... validationGroup: "groupName", onClick: function (e) { e.validationGroup.validate(); } }); })
width
Specifies the widget's width.
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:JavaScriptwidth: function() { return window.innerWidth / 1.5; }
Even if the width of the widget is specified, the count of columns may depend on the screen width. For example, if the screen width is not enough to display the whole form's container, the count of columns depends on the screen width, not the container. To always use a fixed count of columns regardless of the screen width, pass an empty function to the screenByWidth option.
screenByWidth: function() { }
If you have technical questions, please create a support ticket in the DevExpress Support Center.