Introduction:
In this article I will explain how to call JavaScript function from code behind and show JavaScript alert message from code behind using asp.net.
In this article I will explain how to call JavaScript function from code behind and show JavaScript alert message from code behind using asp.net.
Description:
I explained many articles relating to Asp.net, C#.NET, JavaScript, Gridview, JQuery etc. During working with those articles I came across one situation that is show alert message from code behind after completion of my code execution like our JavaScript alert message.
I explained many articles relating to Asp.net, C#.NET, JavaScript, Gridview, JQuery etc. During working with those articles I came across one situation that is show alert message from code behind after completion of my code execution like our JavaScript alert message.
To display JavaScript alert message from code behind we can do by using ScriptManager.RegisterStartupScript() method. This method will allow us to show alert message direclty from code behind or we can call javascript function from code behind in asp.net.
Declaration of ScriptManager.RegisterStartupScript() metod:
Here I will explain how to show JavaScript alert message in code behind and how to call JavaScript function from code behind in asp.net. For that first create new website and write following code in aspx page| ScriptManager.RegisterStartupScript(Control control, Type type,string key, string script, bool addScriptTags) |
<html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title>Call Javascript functions and show alert message from code behind file in asp.net Page</title> <script type="text/javascript"> function Showalert() { alert('Call JavaScript function from codebehind'); } </script> </head> <body> <form id="form1" runat="server"> <div> <asp:Button ID="btnSubmit" runat="server" Text="Show alert" onclick="btnSubmit_Click" /> <asp:Button ID="btnClick" runat="server" Text="Call JavaScript Function" onclick="btnClick_Click" /> </div> </form> </body> </html> |
Now add following namespaces in codebehind file
using System; using System.Web.UI; |
After that write the following code in code behind
C# code
protected void Page_Load(object sender, EventArgs e) { } //This button click event is used to show alert message directly protected void btnSubmit_Click(object sender, EventArgs e) { ScriptManager.RegisterStartupScript(this,GetType(),"showalert","alert('Only alert Message');",true); } // This button click event is used to show alert message from JavaScript function protected void btnClick_Click(object sender, EventArgs e) { ScriptManager.RegisterStartupScript(this, GetType(), "displayalertmessage", "Showalert();", true); } |
VB.NET
Imports System.Web.UI Partial Class Default Inherits System.Web.UI.Page Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) End Sub 'This button click event is used to show alert message directly Protected Sub btnSubmit_Click(ByVal sender As Object, ByVal e As EventArgs) ScriptManager.RegisterStartupScript(Me, [GetType](), "showalert", "alert('Only alert Message');", True) End Sub ' This button click event is used to show alert message from JavaScript function Protected Sub btnClick_Click(ByVal sender As Object, ByVal e As EventArgs) ScriptManager.RegisterStartupScript(Me, [GetType](), "displayalertmessage", "Showalert();", True) End Sub End Class |
Demo
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7 comments :
This would be of great help. Thanks Suresh !
it's helped lot......
what is the advantage of using javascript in codebehind.
very good thanks
This is great help for me ,
Thank you Suresh !
I have one GridView related question ?
Hi Suresh!, I want to know if the page will get refreshed(i.e if the post back will happen) on clicking of ok in the alert message box.