This is a migrated thread and some comments may be shown as answers.

LinkButton passing variables

4 Answers 244 Views

Grid

This is a migrated thread and some comments may be shown as answers.

Konstantinos asked on 20 Apr 2012, 01:09 PM

Ok, first of all hi :)

ALready programming two-months with Telerik, I feel I started to get the grip of things. However there is something that has troubled me for the past few days in my work trying different implementations, but I still cannot seem to find a solution....

What I want to do:
I want to redirect to a new page through a button ( - I don't know if there are practical differences between Image and Link button other than how it is viewed on the user, but I prefer ImageButton - ), which also will pass a variable it in the url (http://www.lala.com?var=myvar - any other way are acceptable)

What I currently do:
In my .aspx file I have
(Grid Properties)

<

telerik:RadGrid ID="rdEthnologicalImages" runat="server"

AllowSorting="True" AutoGenerateColumns="False" CellSpacing="0"

AllowPaging="True" ShowStatusBar="True" GridLines="None"

OnItemCommand="RadGrid_Command" OnNeedDataSource="RadGrid_NeedDataSource"

OnItemDataBound="RadGrid_ItemDataBound">

(Grid Buttons - Download is the button to redirect, Link keeps the text to parse)

<telerik:GridButtonColumn

FilterControlAltText="Filter Download column" HeaderText="Download"

ImageUrl="~/Img/download.png" ItemStyle-HorizontalAlign="Center" Text="Download"

CommandName="Download" UniqueName="Download"><HeaderStyle Width="50px"></HeaderStyle>

<ItemStyle HorizontalAlign="Center"></ItemStyle>

</telerik:GridButtonColumn>

<telerik:GridBoundColumn DataField="Link"

FilterControlAltText="Filter ImageLink column" HeaderText="Link"

UniqueName="ImageLink" Visible="False">

</telerik:GridBoundColumn>

In my .cs file
(I eventually found out that LinkButton has no OnCLick attribute, so that brings me at a dead end...I think..)
(After it found the correct element, it should call the javascript function in the MasterPage - included in the <head>)

if (e.Item.ItemType == GridItemType.Item)

{

GridDataItem dataItem = (GridDataItem)rdEthnologicalImages.MasterTableView.GetItems(GridItemType.Item)[0];

//LinkButton downloadButton = (LinkButton)dataItem.FindControl("Download");

LinkButton downloadButton = (LinkButton)e.Item.FindControl("Download");

if (downloadButton != null)

{

downloadButton.Attributes.Add("OnClick", "popup");

}

In my .js file
(Since I have the text I need in a hidden column, I get it and pass it to the page I want)

function popup()

{

var grid = $find("<%=rdEthnologicalImages.ClientID %>");

var MasterTable = grid.get_masterTableView();

var selectedRows = MasterTable.get_selectedItems();

for (var i = 0; i < selectedRows.length; i++)

{

var row = selectedRows[i];

var link = MasterTable.getCellByColumnUniqueName(row, "ImageLink");

window.open("~/DownloadPopup.aspx?filename=link");

break;

}

Errors:
My main error is that downloadbutton(.cs) is always null. And even if it progressed properly I already have a bad feeling it won't work even then.

For some parts, I am not even 100% of what their functions are.
Any help in the matter?

4 Answers, 1 is accepted

answered on 20 Apr 2012, 01:24 PM

Hello,

Try accessing the buttoncolumn as shown below and then pass the variables.
aspx:

<telerik:GridButtonColumn ButtonType="ImageButton" FilterControlAltText="Filter Download column" HeaderText="Download"

ImageUrl="~/Img/download.png" ItemStyle-HorizontalAlign="Center" Text="Download"

CommandName="Download" UniqueName="Download"><HeaderStyle Width="50px"></HeaderStyle>

<ItemStyle HorizontalAlign="Center"></ItemStyle>

</telerik:GridButtonColumn>

C#:

protected void RadGrid1_ItemDataBound(object sender, Telerik.Web.UI.GridItemEventArgs e)

{

if (e.Item is GridDataItem)

{

GridDataItem item = (GridDataItem)e.Item;

ImageButton btn = (ImageButton)item["Download"].Controls[0];

btn.Attributes.Add("OnClick", "popup");

}

Thanks,
Shinu.

answered on 20 Apr 2012, 01:38 PM

Hello,

<telerik:GridButtonColumn FilterControlAltText="Filter Download column" HeaderText="Download"

ImageUrl="~/Img/download.png" ItemStyle-HorizontalAlign="Center"

CommandName="Download" UniqueName="Download" ButtonType="ImageButton">

<HeaderStyle Width="50px"></HeaderStyle>

<ItemStyle HorizontalAlign="Center"></ItemStyle>

</telerik:GridButtonColumn>

protected void RadGrid1_ItemDataBound(object sender, GridItemEventArgs e)

{

if (e.Item is GridDataItem)

{

GridDataItem dataItem = e.Item as GridDataItem;

ImageButton downloadButton = (ImageButton)dataItem["Download"].Controls[0];

if (downloadButton != null)

{

downloadButton.Attributes.Add("OnClick", "popup");

}

Thanks,
Jayesh Goyani