I am looking for rowdata bound event that we have in asp.net gridview. What I am trying to achieve is this.
e.row.rowtype == datacontrolrowtype.datarow
on data bound event of webdata grid , but it is not working so how can I achieve this.
Suggestion on how get the type of row and its event would be helpful.
Ok, not 100% sure what you mean by achieving 'this' but.. WebDataGrid offers 2 versions of such events so whatever you are attempting would probably have to do with these.
As far as I get your line of code you are interested in data rows only and the following row-related events are fired only for data rows as far as I'm aware(definitely not for headers or Summary rows from my experience):
Server side: The InitializeRow event is raised when the grid binds to the records in the data source. You can find that in the general control Properties or add it at top level in the markup with <ig:WebDataGrid oninitializerow="WebDataGrid1_InitializeRow"...
Within the handler you have access to both the grid and the row and this event is fired for each data row, always:
protected void WebDataGrid1_InitializeRow(object sender, Infragistics.Web.UI.GridControls.RowEventArgs e)
{
// Use:
//e.Row.DataItem
//e.Row.DataKey
//e.Row.Index
}
Client Side Row Rendered /-ing event, that is fired only when client side binding/rendering is enabled. Event fired after / before a row is rendered to the DOM, set up by adding <ClientEvents RowRendered="test" /> where test is the name of the handler function in JavaScript:
function test(webDataGrid, evntArgs) {
//The data object with all attributes
evntArgs.get_dataItem();
//Reference to the actual TR element
evntArgs.get_rowElement();
//Returns index of the row inside of its container collection.
evntArgs.get_index();
//Returns data key of the row. It is always an array of objects even in a case of a single data key field.
evntArgs.get_dataKey();
}
I think you should be able to do what you want to do with those.
Related
I have a got Gridview, that gets its data by:
internal void updateGrid()
{
List<String> data = dt.getAlldata(UserID(), ListID());
gridViewer.DataSource = data;
gridViewer.DataBind();
}
After a button click the database is updated and the new data is shown. Everything works fine.
Now I have to replace the string with an Usercontrol:
internal void updateGrid()
{
List<String> data = dt.getAlldata(UserID(), ListID());
gridViewer.DataSource = data;
gridViewer.DataBind();
for (int i = 0; i < gridViewer..Rows.Count; i++)
{
UCControl dum = (UCControl)LoadControl("~/UCControl.ascx");
dum.SetData(gridViewer.Rows[i].Cells[0].Text, false);
gridViewer.Rows[i].Cells[0].Controls.Clear();
gridViewer.Rows[i].Cells[0].Controls.Add(dum);
}
}
After first Page_Load(), everything is shown correctly. But when I click my buttons, the Usercontrols do not repaint. The data is set correctly inside, but it does not update.
Because this Control reacts by javascript on UserInputs on the client side, every Usercontrol has got his own Id that is set by
this.ID = "UCControl" + data[0];
data[0] is unique, but known during the whole process.
Can somebody tell me why the UserControl does not repaint? Or better: How do I tell the Usercontrols to update?
From your code I would say that once the data is bound then you can't go in immediately after and start to change it. You would need to hook into one of the databinding events.
If you were using a list viem ItemDataBound would be a good candidate to hook into. But the GridView has a more limited set of events and doesn't offer that level of control - so you are a bit stuck on that score.
In my experience using dynamic controls in asp.net (LoadControl) is just a bit fraught. I think a better option would be to publicly expose a property in your user control and bind to that.
This question gives a good description of how to achieve this
asp.net user controls binds inside gridview
Hope that helps
Hi
In ASPxGridView, is there a way to get a row by its VisibleIndex or KeyValue so that I can change any column value in it?, I mean something like this:
var row = myGrid.SelectRowByKeyValue(myKeyValue);
OR:
var row = myGrid.SelectRowByVisibleIndex(myKeyValue);
row["Column1"] = true;
Edit:
What I'm tring to do is that every time I hit the button I want to check one specific row (I'm using ajax to not reload all the page);
Thanks
This can be done using the ASPxGridView.GetRow() method. NOTE, that changing the value in the DataRow is not enough. If you want these changes to be preserved, save them to the DB.
Since you are using unbound columns, you should handle the CustomUnboundColumnData event and provide modified data for this row within this event handler. The common approach is described in the Providing Data for Unbound Columns topic. If this does not help, please describe in greater details.
UPDATE
Your approach is incorrect. The ASPxGridView does not provide a method to set a text of a certain cell (TD). Instead, you should force the grid to raise the CustomUnboundColumnData event. This can be done using the ASPxGridView's DataBind method. In this event handler, you should determine the KeyField value of the processed row, compare it with the keyField value of the row where the button was clicked and return the required value. This is how I would implement this feature...
I solved it by using this code:
for (int i = 0; i < myGridView.VisibleRowCount; i++)
{
if ( [My condition] )
{
(
(CheckBox)myGridView
.FindRowCellTemplateControl(i,
myGridView.Columns["MyColumnName"] as GridViewDataColumn,
"My_Unbound_Control_Name"
)
).Checked = true;
}
}
I's may not be the right way to do it but I couldn't solve it another way.
I'm using a stored procedure in a sql database as the data source for a SqlDataSourceControl on my .aspx page. I'm then using the SqlDataSourceControl as the data source for a gridview on my page. Paging is set to true on the gridview. What i would like to do is set the text of a label to the total number of rows in the gridview. I can use this code
'labelRowCount.Text = GridView2.Rows.Count & " layers found"
to return the number of results per page, but it doesn't give me the total. I've looked in several places and haven't been successful in finding a solution.
You should use the underlying datasource that the gridview is bound to (grid.DataSource). For instance if you have bound the grid to a datatable then just cast the grids datasource into the datatable and the use the rows.count property to get the total record count. Another alternative would be to get a reference to the the grids datasource object before you set it to the grid so you can get the record count directly.
So for example (assuming you are bound to a DataTable)
int count = ((DataTable)grid.DataSource).Rows.Count;
Enjoy!
Put an event handler on "selected" for the SQL DataSource. That event handler has an argument of type SqlDataSourceStatusEventArgs. In there AffectedRows is the row count of the entire data set (not just that shown on the current page). So catch that and write it out to your label:
protected void SqlDataSource_Selected(object sender,SqlDataSourceStatusEventArgs e)
{
if (e.Exception != null)
{
// do something useful, then...
e.ExceptionHandled = true;
}
else
labelRowCount.Text = String.Format("{0} layers found", e.AffectedRows);
}
GridView2.Rows saves only the rows that are visible, so when page-size is 5 you get only 5 records. As Doug suggested you have to set the labelRowCount.Text ondatabound and not on every postback, because on postback - when the datasource is not binded again - the datasource will be nothing. So a good place could be where you bind the grid to the datasource.
I write an imagebutton to a table cell in a new row when a user selects an item in a list:
ImageButton imgbtnRemove = new ImageButton();
imgbtnRemove.ID = "uxStandardLetterDeleteImage_" + items.letterName;
imgbtnRemove.CommandName = "uxStandardLetterDeleteImage_" + items.letterName;
imgbtnRemove.ImageUrl = items.remove;
imgStatus.AlternateText = "Remove";
tRow.Cells[3].Controls.Add(imgbtnRemove);
When the new imagebutton is clicked, I can't seem to get a handle to it. I see it in Page_PreRender event, where I also reload the table on each postback.
string returnData = Request.Form.ToString();
but iterating through the form controls images:
if (c is System.Web.UI.WebControls.Button ||
c is System.Web.UI.WebControls.ImageButton)
does not find it. I can find it if I manually put in a:
imgbtnRemove.Click += new System.Web.UI.ImageClickEventHandler(this.ButtonClick);
in the Page_Load and then grab it in the click event:
switch (((System.Web.UI.WebControls.ImageButton)sender).CommandName)
...
but because there are new rows being added and deleted, this gets rather ugly programmatically. I'm thinking there must be an elegant solution to dynamic imagebutton creation and retrieval on the fly from server side code. I've done a lot of digging but this one is stumping me.
Thanks in advance...
If you're creating dynamic controls during the event handling phase of the Page lifecycle (for example, in the item selected event), then the control will be gone on the next postback.
In order for dynamic controls to be registered with ViewState, they have to be created in the Init phase of the event lifecycle.
Also, you say you're iterating through the Form's controls... when you are adding the imagebutton to the table's cells. Are you recursively descending the control heirarchy to look for the imagebutton?
i've populated a dropdownlist control with different text properties but each text properties had THE SAME value (text property was A, value properties is blah,text property was B, value properties is blahblah, etc... )
ASP.net only checks value properties on postback and because ALL values were the same (for
testing reason) this little annoying behavior happened. Is there a work around? does this mean you can't never have the value to be the same?
Sounds like you are working on the wrong event. Try SelectedIndexChanged.
Ensure you also have the AutoPostBack property set to True.
Resolved
OK, so I got digging on this since I was curious :)
There is a "problem" when databinding with non-unique values.
So, firstly, I publicly apologise for saying otherwise.
To replicate:
ASPX
<asp:DropDownList ID="myDDL" runat="server" AutoPostBack="True">
</asp:DropDownList>
<asp:Label ID="lblSelItem" runat="server"Text="Currently Selected Item: 0"></asp:Label>
<asp:Label ID="lblSelVal" runat="server" Text="Currently Selected Value: X"></asp:Label>
Code-Behind
List<string> MyData()
{
List<string> rtn = new List<string>();
rtn.Add("I am the same value!");
rtn.Add("I am the same value!");
rtn.Add("I am the same value!");
rtn.Add("I am the same value!2");
return rtn;
}
protected void Page_Init()
{
if (!Page.IsPostBack)
{
// Load the Data for the DDL.
myDDL.DataSource = MyData();
myDDL.DataBind();
}
}
protected void Page_Load(object sender, EventArgs e)
{
// Display the Currently Selected Item/Value.
lblSelItem.Text = "Currently Selected Item: " + myDDL.SelectedIndex.ToString();
lblSelVal.Text = "Currently Selected Value: " + myDDL.SelectedValue;
}
Run, changing the values in the DropDownList. Note that a PostBack does not occur.
When looking at the Source, I realised that we need to explicitly set the "value" attribute for the <option> elements generated by the server control, which lead me to do something like:
New Code-Behind
Dictionary<string, string> MyTwoColData()
{
Dictionary<string, string> rtn = new Dictionary<string, string>();
rtn.Add("1", "I am the same value!");
rtn.Add("2", "I am the same value!");
rtn.Add("3", "I am the same value!");
return rtn;
}
protected void Page_Init()
{
if (!Page.IsPostBack)
{
// Load the Data for the DDL.
Dictionary<string, string> data = MyTwoColData();
foreach (KeyValuePair<string, string> pair in MyTwoColData())
{
myDDL.Items.Add(new ListItem(pair.Value, pair.Key));
}
myDDL.DataBind();
}
}
This explcitly sets the values to the "1", "2", "3" etc making them unique, while still displaying the correct data within the list.
Obviously, you can change this to work with single-column lists but just running through a for loop and using the value of i or something.
As to good workarounds with DataSets, not sure.
Realistically, would we present a list of options with the exact same values to the user?
I personally think not, which is probably why this "problem" hasn't been addressed :)
Enjoy!
PS:
Oh, I should also add, if you want to use the text value in the "fix" then change it to SelectedItem rather than SelectedValue.
ASP.NET can't distinguish between different items with the same values in the dropdown because when the browser sends the HTTP POST, it sends just the selected value.
ASP.NET will find the FIRST item in the dropdown with a value that matches.
You need to ensure that each item in the dropdown has a distinct value. You could do this by adding a key to each value. In other words, instead of having "blah" for each value, you'd use "blah-1", "blah-2", etc.
The problem is that if the selected index doesn't change the postback won't fire. In the case where the user makes the same selection, the selected index does not change.
Sorry that this doesn't answer the question, but it does explain the behavior as far as I know.
The SelectedIndexChanged won't even trigger because all the listitem value in the dropdownlist control are the same. I did some googling. It seem like this is the common problem. I haven't found any work around yet.
You could use values like this:
1:2
2:2
3:2
Where the second number is the "real" value. Then your event should fire and you can parse out the "real" value in your code behind.
Why do you have a drop down where all of the values are the same? Or is just that some of them are the same?
If you think back to pre ASP.Net days then the only thing that is send with a form submit from a <SELECT> is the VALUE of the <OPTION>. ASP.Net then effectively works out which item is selected by looking up this value in the list of data items.
You will also notice that if you have two items with the same value but different labels that if you do trigger a postback the next time the form loads the first one will be displayed, even if you have the second one selected before you performed the postback.
If you take a step back for a moment and consider your original data source - how would you identify which text value was selected if all you have is the Value? How would you select that value from a database, or from a list? How would you update that row in the database? If you try it you will find that .Net throw an Exception because it cannot uniquely identify the row.
Therefore you need to add a unique key to your data.