How to Set JavaScript Programmatically on a Page in ASP.NET with Parameters

Programmatically setting JavaScript into an ASP.NET page is very straight forward when you do it in code. That is, in my case, I simply put it in the Page_Load event of the page and have it load from there. I’m currently working on an ExtJS project that requires me to show some details on a page that I want to show with JavaScript. I’ve nicely modularized all the JavaScript into a name space so the code that I want to include on my ASP.NET Page looks like the following:

<script type="text/javascript" language="javascript" >

    ASPWeb.newsGrid.loadTypeId = 229490;

    ASPWeb.newsGrid.init();

</script>

To put the same code in, but substitute the loadTypeId with something meanful, here is the C# code you need to put in your Page_Load C# code.

  protected void Page_Load(object sender, EventArgs e)

            if (!IsPostBack)

                LabelEntityType.Text = EntityTypeId.ToString();

                LabelEntityId.Text = EntityId.ToString();

            // The JavaScript needs to be registed on every post back.  Not just first time.

            // Define the name and type of the client scripts on the page.

            const string csname1 = "LoadDetailsGridScript";

            Type cstype = this.GetType();

            // Get a ClientScriptManager reference from the Page class.

            ClientScriptManager cs = Page.ClientScript;

            // Check to see if the startup script is already registered.

            if (!cs.IsStartupScriptRegistered(cstype, csname1))

                //ASPWeb.newsGrid.loadTypeId = 229490;

                //ASPWeb.newsGrid.init();

                const string cstext1 =

                    "ASPWeb.newsGrid.EntityId = {0};ASPWeb.newsGrid.EntityTypeId = 1; ASPWeb.newsGrid.init();";

                cs.RegisterStartupScript(cstype, csname1, String.Format(cstext1, LabelEntityId.Text), true);

I found this code on line at this MSDN location.

http://msdn.microsoft.com/en-us/library/z9h4dk8y.aspx

Hope this Helps!!!