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+---
+title: Dynamically Adjusting Height of RadTextBox Based on User Input
+description: Learn how to dynamically adjust the height of the RadTextBox control in Telerik UI for ASP.NET AJAX based on the number of lines entered by the user.
+type: how-to
+page_title: Adjusting RadTextBox Height Dynamically Using Client-Side Events
+meta_title: Adjusting RadTextBox Height Dynamically Using Client-Side Events
+slug: textbox-dynamically-adjust-height
+tags: telerik, radtextbox, onvaluechanged, client-events, resize, asp.net-ajax, multiline
+res_type: kb
+ticketid: 1692597
+---
+
+## Environment
+
+<table>
+<tbody>
+<tr>
+<td> Product </td>
+<td> Telerik® UI for ASP.NET AJAX RadTextBox </td>
+</tr>
+<tr>
+<td> Version </td>
+<td> All</td>
+</tr>
+</tbody>
+</table>
+
+## Description
+
+I want to dynamically adjust the height of a [RadTextBox](https://www.telerik.com/products/aspnet-ajax/documentation/controls/textbox/client-side-programming/events/onvaluechanged#onvaluechanged) control based on the number of lines entered by the user. My goal is to avoid vertical scrollbars while maintaining a fixed width of 400px.
+
+## Solution
+
+To dynamically adjust the height of the RadTextBox control, use the `OnValueChanged` client-side event. Attach JavaScript logic to resize the text area as users type. The following example demonstrates how to achieve this:
+
+### Example
+
+Markup:
+
+````ASP.NET
+<telerik:RadTextBox ID="txtComment" runat="server" MaxLength="1024" Rows="5" TextMode="MultiLine" Width="400px">
+    <ClientEvents OnValueChanged="onValueChanged" />
+</telerik:RadTextBox>
+````
+
+````JavaScript
+function onValueChanged(sender, args) {
+    let textArea = sender.get_element();
+
+    function resize() {
+        textArea.style.height = 'auto'; // Reset height
+        textArea.style.height = textArea.scrollHeight + 'px'; // Adjust to content height
+    }
+
+    textArea.addEventListener('input', resize);
+}
+````
+
+Steps:
+
+1. Add the `OnValueChanged` client event to the RadTextBox.
+2. Implement the `resize()` function in JavaScript. It resets the height of the text area and adjusts it to match its scroll height.
+3. Use the `input` event listener to trigger the `resize()` function whenever the user types.
+
+This ensures the height dynamically updates based on the content entered by the user, avoiding vertical scrollbars while keeping the width fixed.
+
+## See Also
+
+- [RadTextBox Client-Side Events Documentation](https://www.telerik.com/products/aspnet-ajax/documentation/controls/textbox/client-side-programming/events/onvaluechanged#onvaluechanged)
+- [RadTextBox Overview](https://www.telerik.com/products/aspnet-ajax/documentation/controls/textbox/overview)