I have a aspxgridview that shows a number of buttons for each row. What I want to be able to do is enable some of these buttons on a per row basis, based on some background logic. When the HtmlRowPrepared event is trapped I tru and use e.Row.FindControl("butApprove") but it returns null. If I keep searching down through the Controls collection several times I can find the control with that id.
Is there an easier way of doing this as I am new to the DevExpress controls.
<dx:GridViewDataButtonEditColumn VisibleIndex="4">
<DataItemTemplate>
<dx:ASPxButton ID="butAddNote" runat="server" Text="Add Note"></dx:ASPxButton>
<dx:ASPxButton ID="butEditContact" runat="server" Text="Edit Contact"></dx:ASPxButton>
<dx:ASPxButton ID="butApprove" runat="server" Text="Approve"></dx:ASPxButton>
<dx:ASPxButton ID="butReject" runat="server" Text="Reject"></dx:ASPxButton>
</DataItemTemplate>
</dx:GridViewDataButtonEditColumn>
Many thanks
Jonathan
I suggest that you use the HtmlRowCreated event and access buttons using the ASPxGridView.FindRowCellTemplateControl method.
Related
I am making some changes to an internal application that has a Telerik RadGrid component on one .aspx page.
Each row in the RadGrid represents an order and there is a dropdown which allows setting the status of the order. Changing the status of the order updates a couple of other properties of the order which are displayed on that row.
Up until now, changing the order status has resulted in a complete page post back and re-render. I'm keen to change this to a partial post back using an UpdatePanel. I could wrap the status dropdown (a RadCombo) in an UpdatePanel which would take care of the actual database changes that are required (as per the code sample below), but then without updating the other properties on the RadGrid row, the updates are not presented to the user.
<telerik:RadGrid ID="OrdersGrid" runat="server" ...>
<MasterTableView DataKeyNames="OrderId" AllowMultiColumnSorting="false">
<NoRecordsTemplate ...></NoRecordsTemplate>
<Columns>
<telerik:GridBoundColumn ... />
...
<telerik:GridTemplateColumn HeaderText="Order Status" UniqueName="OrderStatus">
<ItemTemplate>
<asp:UpdatePanel runat="server">
<ContentTemplate>
<telerik:RadComboBox ID="RadOrderStatus" DataSourceID="OrderStatusDataSource" runat="server"
SelectedValue='<%# Bind("OrderStatus") %>' Skin="Metro" Width="180px" DataTextField="OrderStatus"
DataValueField="OrderStatus" AutoPostBack="True" EnableLoadOnDemand="False" OnSelectedIndexChanged="RadOrderStatus_SelectedIndexChanged">
</telerik:RadComboBox>
</ContentTemplate>
</asp:UpdatePanel>
</ItemTemplate>
</telerik:GridTemplateColumn>
</Columns>
<SortExpressions>...</SortExpressions>
</MasterTableView>
</telerik:RadGrid>
I'm wondering how I can use the UpdatePanel to effectively wrap the row of the RadGrid so that the entire row can be updated as opposed to just the cell that the dropdown is in. I've tried experimenting already with tag placement but I'm new to Telerik and therefore not very clued up.
At what level in the mark up can I place the UpdatePanel to get this to work as I'd like?
Or is there a Telerik way of doing this?
I could wrap the whole grid but if possible, I'd rather not have the whole grid update on each partial post back, the permitted operations are limited to the row level so I see a full grid update as wasteful.
You can't place an UpdatePanel around each row. For starters, there is no provision to do that (you can't do it with the standard GridView either). Then, if you manage to do that (e.g., override the Render event), you would get invalid markup because you can't have <div> elements inside the <table> and between the other <tr> nodes.
One note on the performance—the AJAX request will have the page go through its entire lifecycle on the server, so all code will be executed again and any time consuming operation will also be executed. The only difference between the AJAX and the full postback is what gets rendered and returned in the response, so you basically shave off network time only.
What you can do is the following:
wrap the entire grid. I would use RadAjaxPanel and RadAjaxLoadingPanel so you have a pretty loading indicator. Something like:
<telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" runat="server" Skin="Black"></telerik:RadAjaxLoadingPanel>
<telerik:RadAjaxPanel ID="RadAjaxPanel1" runat="server" LoadingPanelID="RadAjaxLoadingPanel1">
<telerik:RadGrid ID="RadGrid1" runat="server"></telerik:RadGrid>
</telerik:RadAjaxPanel>
OR, use client-side code and jQuery. The combo can call a WebService or a PageMethod that will return the data and you can use jQuery to traverse the DOM and update the other elements (textboxes, dropdowns, whatever you have). This is going to be more difficult.
I have a ASP.Net GridView and I build the column collection myself. Within the column collection I have a HeaderTemplate and within there I have a textbox which I use to filter the records in the grid.
When I enter text within this textbox and perform an action on the grid which causes a postback (i.e. changing the page) I lose the text within my textbox.
Anybody got any ideas as to why this data is lost?
My ASP code for the header template is below:
<HeaderTemplate>
<asp:Label ID="Label1" Text="Number" runat="server" />
<asp:TextBox ID="textBoxNumberFilter" runat="server" />
<asp:ImageButton ID="buttonFilterNumber" runat="server" OnClick="buttonFilters_Click" />
</HeaderTemplate>
Thanks in advance. I'm using ASP.Net 4.0
I think this might help.
http://www.codeproject.com/Articles/38714/How-To-Perpetuate-Dynamic-Controls-Between-Page-Vi
I have datagridview with multiple columns in my asp.net website. And I am displaying a backend sql stored procedure output into this grid using page OnLoad event. First column in the grid contains a checkbox. I have added this checkbox through ItemTemplate, so that all rows will have a checkbox for selecting the row. I want user able to select the checkbox and based on this selection I would like to perform a DB operation.
currently i am using like below, but couldn't able to trigger the event.
<asp:GridView ID="resultGridView" runat="server" >
<Columns>
<asp:TemplateField HeaderText="Processed">
<ItemTemplate>
<asp:CheckBox ID="CheckBoxProcess" runat="server" OnCheckedChanged="resultgrid_CellContentClick"
Checked="false" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
on my code behind, I have method resultgrid_CellContentClick() for checkbox selection change event. But this code, never executed when select checkbox on/off.
You didn't set AutoPostBack="true" in your checkbox, that's why your checkbox event handler did not work. Just set it...
<asp:CheckBox ID="CheckBoxProcess" AutoPostBack="true" runat="server"
OnCheckedChanged="resultgrid_CellContentClick" Checked="false" />
I have a grid view that is data bound to a dataset. In a grid I have a column DefaultValue, which has three controls in it - a dropdownlist, a checkbox and a textbox. Depending on the data that is coming in it can switch to any of these controls. Everything is simple enough when we need just to display data - in gridview_prerender event I simply make one of the controls visible. The control is setup like following:
<asp:TemplateField HeaderText="Default Value" SortExpression="DefaultValue">
<ItemTemplate>
<asp:TextBox ID="txt_defaultValue_view" runat="server" Text='<%# Bind("DefaultValue") %>' Enabled ="false" />
<asp:DropDownList ID="ddl_defaultValue_view" runat="server" Enabled ="false" />
<asp:CheckBox ID="chk_defaultValue_view" runat="server" Enabled ="false" />
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txt_defaultValue_edit" runat="server" Text='<%# Bind("DefaultValue") %>'/>
<asp:DropDownList ID="ddl_defaultValue_edit" runat="server" />
<asp:CheckBox ID="chk_defaultValue_edit" runat="server" />
</EditItemTemplate>
</asp:TemplateField>
My problem starts when I am in edit mode and I need to update the grid with new data. Since only the textbox control is databound, the RowUpdating event can only access data from the textbox column and all of my other data simply gets discarded. I also can't databind with checkbox and dropdownlist control, since they can get an invalid data type exception. So, does anyone know how can I update a column that has three different controls, where each of these three controls might have a valid data?
Thanks
First, i would switch visibility of the controls in RowDataBound of the Grid and not on PreRender, because it can only change on DataBinding and not on every postback.
You can there also bind the Dropdown to its datasource, change the checked-state of the Checkbox and set the Text-property of the Textbox according to the the Dataitem of the Row.
When you update you can find your controls with FindControl in RowUpdating and get their values(f.e. Dropdownlist.SelectedValue).
GridView has pair of events:
RowUpdating/RowUpdated
RowDeleting/RowDeleted
....
In your case your need RowUpdating - is called right before update is performed, So find in row expected control (saying checkbox) and make preparation before pass to database
As another way review possibility to use ObjectDataSource event Updating - it is usual way to specify parameters for query execution.
Given the following InsertItemTemplate (simplified) I'm not getting anything back in the event object's Values collection.
<InsertItemTemplate>
Item:
<asp:DropDownList ID="ItemInsertType"
DataTextField="SearchItemName"
DataValueField="SearchItemID" runat="server" />
Hide Location:
<asp:TextBox ID="txtItemHideLocation" Text='<%# Bind("HideLocation") %>' runat="server"></asp:TextBox>
<asp:Button ID="btnSearchSearchItemInsert" CommandName="Insert" runat="server" Text="Add" />
<asp:Button ID="btnSearchSearchItemInsertCancel" CommandName="Cancel" runat="server" Text="Cancel" />
</InsertItemTemplate>
I'm binding the listview to a collection attached to my nHibernate model object (SearchObject.SearchItems). This collection doesn't have insert or update handling like an object datasource would, so I want to handle the insert/update events manually. Is there a way to get these values to come through automatically, or do I have to manually grab each value from its control when I handle this event?
I was using reflector on that assembly, and it looks to me (could be wrong) that it only supports IBindableControl controls for automatic extraction into the Values collection. So Values would not contain an entry for any non-IBindableControl-supporting controls. TextBox does not implement this, nor does DropDownList.
I typically use the InsertItem property and extract the control references directly using FindControl.
HTH.