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

Updated: at 02:12 PM

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;

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;
                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.

Hope this Helps!!!

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