[dba-VB] ASP.NET - pass data from .cs to .js

Gustav Brock gustav at cactus.dk
Tue Dec 11 08:29:00 CST 2012

Hi all

Is SignalR familiar to anyone:


.. the ability to have your server-side code push content to the connected
clients as it happens, in real-time.


-----Oprindelig meddelelse-----
Fra: dba-vb-bounces at databaseadvisors.com
[mailto:dba-vb-bounces at databaseadvisors.com] På vegne af Gustav Brock
Sendt: 21. november 2012 17:39
Til: 'Discussion concerning Visual Basic and related programming issues.'
Emne: [dba-VB] ASP.NET - pass data from .cs to .js

Hi all

I have an ASP.NET winform project (.aspx) with a code-behind .cs file and an
included .js file for client side code.
The client side code is nothing special, only that it minimizes the
round-trip to the server which I found slowed down the page when run on a
smart-phone with GSM data link (not WiFi).

How can I pass data from the .cs code to the .js code?

Right now I write some client side script at Page_Load:

private void RegisterScripts()
    // Output the reference to the .js file.
    Page.ClientScript.RegisterClientScriptInclude(this.GetType(), "jScript",
    // Output the variables.
    StringBuilder sb = new StringBuilder();
    sb.Append("<script type=\"text/javascript\"
    sb.AppendFormat("var optionsOne = new
Array(\"{0}\",\"{1}\",\"{2}\");\n", optionsAll[0,0], optionsAll[0,1],
    sb.AppendFormat("var optionsTwo = new
Array(\"{0}\",\"{1}\",\"{2}\");\n", optionsAll[1,0], optionsAll[1,1],
    sb.AppendFormat("var optionsThree = new
Array(\"{0}\",\"{1}\",\"{2}\");\n", optionsAll[2,0], optionsAll[2,1],
    sb.AppendFormat("var answerComments = new Array(\"{0}\",\"{1}\");\n",
answerComments[0], answerComments[1]);
    sb.AppendFormat("var alertEnterEmail = \"{0}\";\n", alertEnterEmail);
    Page.ClientScript.RegisterClientScriptBlock(GetType(), "fillOptions",
sb.ToString()); } </c#>

This works fine and dandy as the data (the arrays and variables) are static
during a session (but not between sessions) as these are retrieved once from
the database also at Page_Load.

But the scriptblock is visible at client side if the user selects "View
source" in the browser and I would prefer it not to be.
Also, the method of writing code lines from code seems sort of primitive to
Would there be a better/easier/smarter way?


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