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  • Category: JavaScript

    Call JavaScript file from Class Library Project Only(without Page)

    I have class library project in C# and .js file also available in same project. i need to get JavaScript function value in .cs file method
  • #765959
    You need to register or call javascript function from class file, import System.Web.UI and System.Web namespace on your class file, see below snippet

    public static void Error(string message)
    {
    //----- One Way----If you are not using ScriptManager on page-------------
    HttpContext.Current.Response.Write("<script type='text/javascript' language='javascript'>alert('" + message + "');</script>");
    ////----- Second Way ------- If you are not using ScriptManager on page -------
    Page page = HttpContext.Current.Handler as Page;
    ClientScriptManager cs = page.ClientScript;
    cs.RegisterStartupScript(page.GetType(), "WitoutUpdatePanel", "javascript:alert('" + message + "');", true);
    ////----- Third Way------- If you are using ScriptManager on page -------------
    ScriptManager.RegisterStartupScript(page, page.GetType(), "WithUpdatePanel", "javascript:alert('" + message + "')", true);
    }

    From this method you need to use any one code depends on your condition which I have added in comments.
    In this way you can call javascript function from class file asp.net C#

    Thanks
    Koolprasd2003
    Editor, DotNetSpider MVM
    Microsoft MVP 2014 [ASP.NET/IIS]

  • #765961
    Created one class file and called created ShowMessage method in that newly created class file. Using console application can access this method
    Error : HttpContext.Current.Response.Write("<script type='text/javascript' language='javascript'>alert('" + message + "');</script>");
    Object reference not set to an instance of an object.

    Class File:

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Web;
    using System.Web.UI;

    namespace Home
    {
    public class Decode
    {
    public static void ShowMessage(string message)
    {
    HttpContext.Current.Response.Write("<script type='text/javascript' language='javascript'>alert('" + message + "');</script>");
    }
    }
    }

    My Console Application :
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using Home;

    namespace RESTConsole
    {
    class Program
    {
    static void Main(string[] args)
    {
    Home.Decode.ShowMessage("Welcome to Application");
    }
    }
    }


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