How to access the Report Parameters in HTML5 viewer report

[Kunal Bagga]

Hi, 
I want to access the Report Parameters in the back end of the report (I am using HTML5 report viewer). As explained for the normal report I have tried accessing the parameters in NeedDataSource. But the value of the parameter is Null even in NeedDataSource. Can you guys explain me this. ? 

[Stef]

Hi Kunal,

In general, in events you can access the running values of report parameters as illustrated in the Using Report Events article. Still we have considerations for modifying the report definition in events and recommend creating the report in such manner that data retrieval and changes (hiding/showing items, styling changes) to be controlled via report parameters, which can be changed on displaying a report.

Consider the example with an ObjectDataSource that wraps a data retrieval method, which controls the retrieved data via parameters mapped to report parameters - Using Parameters with the ObjectDataSource Component.

You can also use a custom report resolver, and modify the report or bind the data in its Resolve method. For more details check this forum post.

We will appreciate it if you let us know more details about the reason to use events and access report parameters in them.

Regards,
Stef
Telerik

 

 

[Kunal Bagga]

Hi Stef, 
In my problem, my objectDataSource can get the report parameters but when I try to access the value in the back end of the report either by NeedDatasource or ItemDataBound, the parameter value is null. 

These are the followings assignment that I did for the report
1. Visibility of the Report Parameter is false;
2. I have not set datasource for the report. But I set the objectDataSource for the table under the report
3. I am using Html5Report Viewer.

[Stef]

Hi Kunal,

Thank you for your update.

In events you can access the report parmaeters' running values by getting first the processing equivalent of the report, and then its Parameters collection e.g.:

void table_NeedDataSource(object sender, EventArgs e)

{

     var procTable = sender as Telerik.Reporting.Processing.Table;

     var procReport = procTable.Report as

Telerik.Reporting.Processing.Report;

    object processingParameterValue = procReport.Parameters["parameter1"].Value;

    procReport.DataSource = GetData(processingParameterValue);

}

Regards,
Stef
Telerik

 

 

[Kunal Bagga]

Ok thanks.. 
This gives me the exact result.