using C# class in jscript

[Guest]

Hello,

I have the following problem:
I have a web project where I display an activeX control that displays
2D-graphs on an aspx-page. I use jscript to access and modify the properties
of the activeX-2D-control. In
codebehind, I use C# for the application logic (eg. the database access).
The query to the database retuns me an object of a C# class (called
DBResultSet) that contains all the data from the query. This data has then to
be visualized on the 2d-graph activeX control on the .aspx-page
Here comes my question now:
How can I access the properties & methods of the class DBResultSet to assign
them to arrays and objects in jscript.
I know that the activeX control and jscript work on the clientside and the
application logic (written in C#) runs on the server. But the activeX control
can only be accessed on the clientside and I need the data from the database
to be displayed in the activeX-control.

I hope, somebody can help

thanks in advance

RFS666

 

[Grant Merwitz]

Two thing that comes to mind.

1) XmlHttp. Why not use Ajax to request the data in an Xml Format, which
your JScript can read and and set your 2d-graph appropriately.

2) Alternately, your C# code can write the JavaScript on page load and use
the Class DBResultSet while doing so

HTH

-G

 

[Guest]

Wow, thanks for the quick answer.

I decided to try alternative 2.
I create a string that contains the whole script code, beginning with
<script=jscript> and ending with </script>. Then I use the
registerClientScriptBlock method to inject the string containing the
scriptcode into the aspx-page.
But I don't know how to use the DBResult class in this script block.
The DBResult class contains a string array and an object array, these two
things have to be assigned to jscript string arrays and object arrays. My
problem is, I don't know how to make the cross-language assignment in the
scriptblock.
I tried like this:
string script = "<script language=jscript>";
script += "function useResult() {";
script += "var result : DBResult =
nameOfTheProtectedVariableInCodeBehindOfTypDBResult"; // Error in this line
script += "}";
script +="</script>";
RegisterClientScriptBlock("scriptBlock", script);

But this doesn't work.
Do I have to import something or so?

Thanks.

RFS666

 

[Grant Merwitz]

You need to come out of your inverted comma's

Lets make a basic example.

Code Behind

private void Page_Load(object Sender, EventArgs e)
{
string str = "HELLO";
string MyScript = "";
MyScript = "<script language=jscript>";
MyScript += "alert(" + str + ");"; //Here i am coming out of the string
into the code
MyScript +="</script>";
RegisterClientScriptBlock("scriptBlock", MyScript);
}

the effect.
A popup box that says hello

So when your setting your script, remember to come out of the inverted
comma;s to start using your c# variables or methids.

Hope thats clear enough

 

[Guest]

Hello Grant,
thanks for you quick and patient help,

you helped me really a lot!

RFS666