How can i select Datakey value of a grid .? I tried but only getting inside selected index changed event.
[In my application there is a grid.In that grid there link buttons.My issue is when i am clicking on link button i want to acceess value in Datakeynames. is there any method to access value in Datakeynames. or is there any other property for grid to keep key values ].Please help
You have your answer at below link
How to get the Command Argument on Row Data bound Event of gridview
Happy coding!!!
Try like this,
Assign your Value in the Command Argument.
In RowCommand Event,
if (e.CommandName == "Link")
{
string Value = e.CommandArgument.ToString();
}
Related
I followed this article for key press search in gridview.Everything working fine but I can't find selecterow cell vaule using selectedindexchanged. Still I can fireup the method but can't see value it return only  .
http://www.aspsnippets.com/Articles/Search-GridView-with-Paging-on-TextBox-KeyPress-using-jQuery-in-ASPNet.aspx
If you using BoundField Column, then
string name = YourGridView.SelectedRow.Cells[0].Text;
and for TemplateField Column controls
string name = (YourGridView.SelectedRow.FindControl("lblSomeName") as Label).Text;
Nothing worked. However I get the value by using java script
$("#<%=gvCustomers.ClientID%> tr:has(td)").click(function (e) {
var cell = $(this).find("td:eq(0)");
$(this).closest('table').find('th').eq($(this).index());
});
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 am using DevExpress Xtragrid control in my C#.net windows application.
I enter some value into the first cell of the grid and if i go to second cell , the value entered in the first cell disappears.
How to retain the value entered in the cell ?
I am assuming that you are using this for an unbound column in a gridView (Xtragrid), first step is make sure to go to the column properties, and change the UnboundType property value to the datatype that you will be entering into that column, example below uses double.
Assign the CustomUnboundColumnData event to your gridView. Make sure that you declare a class level variable (named _userEnteredData in code sample below) to hold the value that you are entering into your gridView, then add the following piece of code, but make sure that you change the names to match your gridView and variable names:
Class level variable declaration:
private double _userEnteredData = 0;
Now the event:
private void gridView1_CustomUnboundColumnData(object sender, DevExpress.XtraGrid.Views.Base.CustomColumnDataEventArgs e)
{
if (e.Column == gridColumn_YourColumn && e.IsSetData)
{
_userEnteredData = Convert.ToDouble(e.Value);
}
else if (e.Column == gridColumn_YourColumn && e.IsGetData)
{
e.Value = _userEnteredData;
}
}
I hope this helps.
You can get further details from here:
http://documentation.devexpress.com/#WindowsForms/CustomDocument1477
Few possibilities:
check FieldName property of edited column. Maybe there is a typo, so grid does not pass your entered value to underlying datasource
property that is bound to column must have public setter. If there is only getter, grid also won't be capable to store entered value
check ColumnOptions.ReadOnly property in grid column - must be set to false
Hope this helps
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.