Set StartIndex

[Jens-Thomas]

Hi,

I'm calling a page containing a data pager. Part of my initial call url is a page number I would like to go to.
I searched around and tried a lot of things without success:
- FireCommand
- SEO Paging

What is the designed way to specify a start page for a data pager?

THANKS!

[Angel Petrov]

Hi Jens,

I have already provided an answer in the official support ticket you have opened regarding this matter. In order to avoid duplicate posts I would kindly like to ask you to post your queries there. Later you can share your findings here so other community members can benefit from them.

Regards,
Angel Petrov
Telerik

 

 

[Jens-Thomas]

I finally solved it! It turned out to be quite tricky as I had some dependencies on the current page that where not satisfied when using FireCommand - it was simply to late when fired.

So the correct approach and only way to set the initial start page, is to use FireCommand within OnPreRenderComplete:

protected override void OnPreRenderComplete(EventArgs e)
    {
        base.OnPreRenderComplete(e);
        if (!IsPostBack)
        {
            RadDataPager1.FireCommand("Page", "5");
        }
    }

In case OnPreRenderComplete is to late - i.e. data bindings on some other controls that would need the current page, it would be important to decouple it from RadDataPager.CurrentPageIndex and set a global variable for it. So you have the page either from the URL or in case of a post back the pager control itself.

Here some code:

int pageIndex = 0;

protected void Page_Init(object sender, EventArgs e)
{
    .....

    // set current page from URL - PART I
    if (!IsPostBack && string.IsNullOrEmpty(Request["p"]))
    {
        try
        {
            pageIndex = int.Parse(Request["p"]);
        }
        catch
        {
        }
    }

    .....

}

protected override void OnLoad(EventArgs e)
{
    // get current page from control
    if (IsPostBack)
    {
        pageIndex = RadDataPager1.CurrentPageIndex;
    }
}

protected override void OnPreRenderComplete(EventArgs e)
{
    base.OnPreRenderComplete(e);

    // set current page from URL - PART II
    if (!IsPostBack && string.IsNullOrEmpty(Request["p"]))
    {
        RadDataPager1.FireCommand("Page", pageIndex.ToString());
    }
}

protected void RadDataPager1_PageIndexChanged(object sender, RadDataPagerPageIndexChangeEventArgs e)
{

    // when changing the page using the control in the page, get current(new) page from the event
    // OnLoad contains the OLD value
    if (IsPostBack)
    {
        pageIndex = e.NewPageIndex;

        // re data bind dependent controls for new page
        RadListView1.DataBind();
    }
}

protected void RadListView1_OnDataBinding(object sender, EventArgs args)
{
    ...

    // use pageIndex for current page

    ...
}

Hope this helps...

Thanks to Telerik for clarification of the RadDataPager behavior and the idea with the global variable.

Jens