CompareValidator

Demonstration and configuration of the Radzen Blazor CompareValidator component.

These demos showcase form validation that compares user input against predefined values or other components (e.g., password confirmation), conditional validation using Visible property, customizable comparison operators (Equal/NotEqual/LessThan/GreaterThan), and flexible appearance options (inline/block/popup with Popup and Style properties).

Basic Usage link

RadzenCompareValidator compares the user input against a predefined value or another component.

To use it perform these steps:

1. Add an input component and set its Name. Data-bind its value to a model property via @bind-Value=@model.Property.
2. Add RadzenCompareValidator and set its Component property to the Name of the input component. Set its Value property to the value you want to compare with (usually another model property).

Important! RadzenCompareValidator works only inside RadzenTemplateForm.

Here is a typical user registration form which checks if the user entered the same password.

Coditional Validation link

To make the validator conditional you can set its Visible property. When set to false the validator will not run. In the example above Visible is set to !string.IsNullOrEmpty(model.RepeatPassword) - the validator will not run if RepeatPassword is empty.

    <RadzenCompareValidator Visible=@(!string.IsNullOrEmpty(model.RepeatPassword)) Value=@model.Password Component="RepeatPassword" Text="Passwords should be the same" Popup=@popup Style="position: absolute" />
    

Comparison operator link

By default RadzenCompareValidator checks if the component value is equal to Value. This can be changed via the Operator property.

Appearance link

By default RadzenCompareValidator appears next to the component it validates. To make it appear below add Style="display:block".

    <RadzenNumeric Name="Count" @bind-Value=@model.Count />
    <RadzenCompareValidator Style="display:block" Component="Count" Text="Count should be less than 10" Operator="CompareOperator.LessThan" Value="10" />
    

To make it appear as a styled popup set its Popup property to true and set its CSS position to absolute. The validated component should have display: block so the validation message appears right below it.

    <RadzenNumeric Name="Count" @bind-Value=@model.Count Style="display:block" />
    <RadzenCompareValidator Style="position:absolute" Popup="true" Component="Count" Text="Count should be less than 10" Operator="CompareOperator.LessThan" Value="10" />
    

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