Added new kb article grid-trigger-next-prev-frozen-columns-external-b…

…uttons (#570)

Co-authored-by: KB Bot <kb-bot@telerik.com>

knowledge-base/grid-trigger-next-prev-frozen-columns-external-buttons.md

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+---
+title: Triggering RadGrid's EnableNextPrevFrozenColumns from External Buttons
+description: Learn how to control the EnableNextPrevFrozenColumns feature of RadGrid for ASP.NET AJAX using external buttons.
+type: how-to
+page_title: Using External Buttons to Control RadGrid's Frozen Columns Navigation
+slug: grid-trigger-next-prev-frozen-columns-external-buttons
+tags: radgrid, asp.net ajax, frozen columns, enablenextprevfrozencolumns, external buttons, onclientclick
+res_type: kb
+ticketid: 1658263
+---
+
+## Environment
+
+| Product | RadGrid for ASP.NET AJAX |
+| --- | --- |
+| Version | All |
+
+## Description
+
+I need to control the EnableNextPrevFrozenColumns feature of the RadGrid from external buttons, without using a template inside the RadGrid. I want to trigger this feature using an OnClientClick event from these external buttons.
+
+This KB article also answers the following questions:
+
+- How can I use external buttons to navigate frozen columns in RadGrid?
+- Is it possible to trigger RadGrid's next and previous frozen columns from buttons outside the grid?
+- Can external buttons control the EnableNextPrevFrozenColumns feature in RadGrid?
+
+## Solution
+
+To control the EnableNextPrevFrozenColumns feature of RadGrid from external buttons, follow these steps:
+
+1. Add two external buttons outside the RadGrid. Set their `AutoPostBack` property to `false` and subscribe them to the `OnClientClicked` event.
+
+    ````ASP.NET
+    <telerik:RadButton runat="server" ID="RadButton2" Text="Previous" AutoPostBack="false" OnClientClicked="onClientClick" />
+    <telerik:RadButton runat="server" ID="RadButton1" Text="Next" AutoPostBack="false" OnClientClicked="onClientClick" />
+    ````
+
+2. Implement the `onClientClick` JavaScript function. This function will programmatically click the corresponding next or previous button within the RadGrid based on the text of the sender button.
+
+    ````JavaScript
+    function onClientClick(sender, args) {
+        var button = undefined; // Declare the button 
+        var text = sender.get_text(); // Get the text of the sender button
+
+        if (text === "Next") {
+            button = document.querySelector(".rgNext"); // Select the next button by its class name
+        } else if (text === "Previous") {
+            button = document.querySelector(".rgPrev"); // Select the previous button by its class name
+        }
+
+        if (button) {
+            button.click(); // Programmatically click the selected button
+        }
+    }
+    ````
+
+3. Ensure the RadGrid is properly configured to use the EnableNextPrevFrozenColumns feature.
+
+This approach allows you to control the navigation of frozen columns in RadGrid using external buttons, facilitating a more flexible UI design.
+
+## See Also
+
+- [Frozen Columns Documentation](https://docs.telerik.com/devtools/aspnet-ajax/controls/grid/functionality/scrolling/frozen-columns)
+- [RadButton Documentation](https://docs.telerik.com/devtools/aspnet-ajax/controls/button/overview)