> For the complete documentation index, see [llms.txt](https://docs.gapvelocity.ai/webmap/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.gapvelocity.ai/webmap/general/frontend/documentation/webforms-angular-components/web-components/kendoui-components/requiredfieldvalidator.md).

# RequiredFieldValidator

Adds support for \[System.Web.UI.WebControls.RequiredFieldValidator] [<mark style="color:orange;">https://docs.microsoft.com/en-us/dotnet/api/system.web.ui.webcontrols.requiredfieldvalidator?view=netframework-4.8</mark>](https://docs.microsoft.com/en-us/dotnet/api/system.web.ui.webcontrols.requiredfieldvalidator?view=netframework-4.8)

Validates value of control is different than property initial value (in most cases empty).

### **Implementation Details:**

**Component Selector:** ‘wm-required-field-validator’

**Kendo UI Component:** <mark style="color:orange;">N/A</mark>

## **Class inheritance**

RequiredFieldValidatorComponent extends [<mark style="color:orange;">BaseValidatorComponent</mark>](/webmap/general/frontend/documentation/webforms-angular-components/web-components/base-components/basevalidator-component.md)

## **PME Support**

### **Properties**

| **Property**              | **Get/Set** | **Details**                                                                                                                      |
| ------------------------- | ----------- | -------------------------------------------------------------------------------------------------------------------------------- |
| ControlToValidate: string | Yes         | ID of control to validate                                                                                                        |
| InitialValue:string       | Yes         | Pattern used to validate control to validate                                                                                     |
| ErrorMessage:string       | Yes         | Message to show if value in control to validate is equals to Initialvalue property assigned value and text property is empty     |
| Text:string               | Yes         | Message to show if value in control to validate is equals to Initialvalue property assigned value                                |
| Display:ValidatorDisplay  | Yes         | Enum property with options Static,None,Dynamic                                                                                   |
| ValidationGroup:string    | Yes         | If is established the name of the validationgroup component only will validate controls with the same validationgroup associated |
| Hidden:boolean            | Yes         | Establishes if the validator shows or is hides                                                                                   |

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### **Methods**

| **Methods**     | **Details**                                                                                              |
| --------------- | -------------------------------------------------------------------------------------------------------- |
| validateControl | Return Boolean value based in value in Control to validate is different than InitialValue property value |
| displayMesssage | Shows value of text property or ErrorMessage property in case text property is empty                     |

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