Added new kb article numerictextbox-disable-arrows (#2398)

* Added new kb article numerictextbox-disable-arrows

* chore(NumericTextBox): apply comments suggestions

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Co-authored-by: KB Bot <[email protected]>
Co-authored-by: Hristian Stefanov <[email protected]>

Author: 3 people

knowledge-base/numerictextbox-disable-arrows.md

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+---
+title: Disable NumericTextBox Arrows at Min or Max Value in Blazor
+description: Learn how to programmatically disable the increase or decrease arrows of a NumericTextBox in Blazor when the value reaches its minimum or maximum limit.
+type: how-to
+page_title: How to Disable NumericTextBox Arrows on Min or Max Value in Blazor
+slug: numerictextbox-disable-arrows
+tags: numerictextbox, blazor, disable arrows, conditional styling
+res_type: kb
+ticketid: 1665216
+---
+
+## Environment
+
+<table>
+    <tbody>
+	    <tr>
+	    	<td>Product</td>
+	    	<td>NumericTextBox for Blazor</td>
+	    </tr>
+    </tbody>
+</table>
+
+## Description
+
+In a NumericTextBox with enabled arrows, I want to disable the down arrow programmatically at the component's minimum value to prevent looping to the maximum value. 
+
+This KB article answers the following questions:
+
+- How can I disable the NumericTextBox increment and decrement buttons based on the value?
+- How can I conditionally disable the NumericTextBox arrows when reaching specified value limits?
+
+## Solution
+
+To prevent your end users from looping through the minimum and maximum values with the icnrease/decrease arrows of the NumericTextBox, apply a conditional CSS class to disable the buttons. 
+
+The example below demonstrates how to conditionally render CSS styles to disable the increase or decrease arrows based on the current value of the NumericTextBox.
+
+>caption The Min and Max values should not match the default minimum and maximum values of the Value type.
+
+````CSHTML
+<style>
+    .disable-increase .k-spinner-increase,
+    .disable-decrease .k-spinner-decrease {
+        pointer-events: none;
+        opacity: 0.5;
+    }
+</style>
+
+<TelerikNumericTextBox @bind-Value="@NumericValue"
+                       Min="@MinValue"
+                       Max="@MaxValue"
+                       Class="@NumericClass"
+                       Width="300px">
+</TelerikNumericTextBox>
+
+@code {
+    private int NumericValue { get; set; } = 3;
+    private int MinValue { get; set; } = 1;
+    private int MaxValue { get; set; } = 10;
+
+    private string NumericClass => $"{(NumericValue == MaxValue ? "disable-increase" : "")} {(NumericValue == MinValue ? "disable-decrease" : "")}";
+}
+````
+
+## See Also
+
+* [NumericTextBox Overview](https://docs.telerik.com/blazor-ui/components/numerictextbox/overview)
+* [Override the Theme or Apply Custom CSS Styles]({%slug themes-override%})