In one of my form there were two Dropdown fields. The second dropdown has to be populated from the database, dynamically from the selection of first dropdown.
Any help is appreciated.
In the SelectedIndexChanged event of the first DropDownList, add code to populate the second DropDownList based on the selected value of the first list
Like this:
<asp:DropDownList runat="server" ID="from" AutoPostBack="true" CausesValidation="false" OnSelectedIndexChanged="from_SelectedIndexChanged">
</asp:DropDownList>
<asp:DropDownList runat="server" ID="to" />
protected void from_SelectedIndexChanged(object sender, EventArgs e)
{
var selectedValue = this.from.SelectedValue;
this.to.DataSource = /*get the data of the second list based on: selectedValue*/;
this.to.DataBind();
}
Related
Default dropdownlist values include locations for all books. When I select a checkbox the the dropdownlist should populate only the locations where that book is available.In back-end, My Stored procedure is working fine for single parameter and multiple values.
But in UI, I can get locations for only one checkbox, if I click second checkbox the dropdown list does not include the value for that second checkbox.
Also when I unclick all it should return to default.
Any hint or help will be appreciated.
<label>BooksLocations</label>
<asp:DropDownList runat="server" ID="drpdwnListLocationBooks" CssClass="formcontrol">
</asp:DropDownList>
<label>Books</label>
<asp:CheckBoxList runat="server" ID="chkboxListbookStatus">
<asp:ListItem Text="Book A"></asp:ListItem>
<asp:ListItem Text="Book B"></asp:ListItem>
<asp:ListItem Text="Book C"></asp:ListItem>
</asp:CheckBoxList>
Add below code
<asp:CheckBoxList runat="server" ID="chkboxListbookStatus"
AutoPostBack="True" OnSelectedIndexChanged="chkboxListbookStatus_SelectedIndexChanged">
Then in code behind
protected void chkboxListbookStatus_SelectedIndexChanged(object sender, EventArgs e)
{
CheckBoxList list = sender as CheckBoxList;
ListItem box = list.SelectedItem;
//add code to get data from SP to fill data in dropdown
}
this is for ticketing system where the tickets are in different status like 'open, rejected, closed, resolved..'
In asp.net i have a gridview and in the gridview there are textboxes and a dropdownlist.
i can get output from the database and get to populate it in the gridview and also the contents in the dropdown list are also displayed.
how can i get to bind the data of the dropdownlist in the grid to that of the output of the query. if the ticket is closed it should select closed, if the ticket is rejected it should select rejected.
in the onrowCommand, i fetch data from another table and populate into the dropdown list. this is the full list of status like 'oopen, rejected, closed, resolved..'
Your question is missing details like what markup you have used for gridview and also what code you have for RowDataBound event.
So, I have provided a sample answer that you can easily adapt to your situation.
I am assuming you have a gridview with an id of GridView1 that contains the following ItemTemplate ( other columns have been omitted since they are not needed to understand this approach).
You should have a hidden field in the template so you can store the current status of the row; also when you are binding your gridview you should be getting a column called Status for the row.
Sample Markup
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false"
OnRowDataBound="GridView1_OnRowDataBound">
<Columns>
<asp:TemplateField HeaderText = "Status">
<ItemTemplate>
<asp:HiddenField ID="hfStatus" runat="server" Value='<%# Eval("Status") %>' />
<asp:DropDownList ID="ddlStatus" runat="server">
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
</Columns>
Then in your RowDataBound event where you are binding the dropdown for the row, you need to get the value of hidden field hfStatus and then set the selected item of dropdown using this value.
I have assumed that a method called GetStatusDropDownListData is there that gets the data for binding dropdown list.
Sample RowDataBound event
protected void GridView1_OnRowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
//Find the DropDownList in the Row
DropDownList ddlStatus = (e.Row.FindControl("ddlStatus") as DropDownList);
ddlStatus.DataSource = GetStatusDropDownListData();
ddlStatus.DataTextField = "Status";
ddlStatus.DataValueField = "Status";
ddlStatus.DataBind();
//Select the Status in DropDownList
string currentStatus = (e.Row.FindControl("hfStatus") as HiddenField).Value;
ddlStatus.Items.FindByValue(currentStatus).Selected = true;
}
}
i had used this code and its working now:
in asp file:
' Visible = "false" />
in the .cs file
string currentStatus = (e.Row.FindControl("lblStatus") as Label).Text;
ddlStatus.Items.FindByValue(currentStatus).Selected = true;
I have a GridView in ASP.NET page. The GridView is bound to a dataset/datatabe. One of the columns of the grid is a command button and the gridview has method OnRowCommand (e.g. OnRowCommand="GridView_RowCommand") specified.
When user clicks on the button in the grid, the method GridView_RowCommand fires. I would like to find the index to the DataTable for the row where button was clicked. Note, that I am not looking for index to the GridView row but rather the index to the DataTable bound to the GridView.
Thank you in advance for your help.
You have a few options and it depends on the amount of data you are binding to the gridview, one you could save the dataset/datatable to Session[""] as you bind or you could retrieve the data from the database again once you have the unique id of the row. You could create the following on your gridview:
<asp:GridView ID="gvCustomer" runat="server"
AutoGenerateColumns="False" DataKeyNames="yourId" onrowcommand="gvCustomer_RowCommand">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:LinkButton ID="lnkAction" runat="server" Text="Do Something" CommandName="yourEvent" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
then in the code behind for the RowCommand event have:
protected void gvCustomer_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "yourEvent")
{
var row = (GridViewRow)((LinkButton)e.CommandSource).NamingContainer;
int rowId = Convert.ToInt32(gvCustomer.DataKeys[row.RowIndex]["yourId"]);
}
}
At this point you have the id which you could either query the database again or access the data source object that you save in to session before binding to the gridview
Or another alternative is:
<asp:LinkButton CommandArgument='<%#Eval("PrimaryKey")%>' />
Then you can get the arg with e.CommandArgument in the gvCustomer_RowCommand method
I am binding a Repeater. Each row (is that the right word?) in the Repeater has a Button and a HiddenField. How do I determine the Value of the HiddenField based on which Button was clicked?
Code behind for Button's OnClick event:
protected void btnButton1_Click(object sender, EventArgs e)
{
Button btnButton1 = (Button)sender;
// how do i get this row's HiddenField Value?
}
edit: the CommandArgument suggestion from Pleun works but I am still having issues. I need to find the row(?) in the Repeater that the Button belongs to as there is also a TextBox in each row and I would need its value. So ideally I want to get that row and go FindControl("TextBox1") etc etc. Sorry, should have stated that in my initial question
What I like to do is add a CommandArgument to the button. In this code its an imagebutton but the idea is the same. So also no need for an extra hidden field.
<asp:ImageButton ID="btnMail" ImageUrl="~/imgnew/prof/sendlink.png"
CommandArgument='<%# Eval("id")%>'
And in the _Click event do
string id = ((ImageButton)sender).CommandArgument;
Update:
If you need all the data, you need a different event. The data in the repeater is available as Item in
RepeaterCommandEventArgs
in the Command event (RepeaterCommandEventArgs)
for handling the Command event see this example
http://www.asp.net/data-access/tutorials/custom-buttons-in-the-datalist-and-repeater-cs
or
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.repeatercommandeventargs.aspx
If you using Repeater you can identify elements in each row in the ItemDataBound.
If you using gridview use RowDataBound
Hope this helps
You can traverse upwards by getting the button's Parent, then doing a FindControl() on that control.
Row parentRow = (Row)((Button)sender).Parent;
var tBox = (System.Web.UI.WebControls.TextBox)parentRow.FindControl("myTextBox")
You may have to play around to see how deep the button is nested and with what control types to get to the appropriate parent.
My markup code:
<asp:Repeater ID="RptFiles" runat="server">
<HeaderTemplate>
<table>
</HeaderTemplate>
<ItemTemplate>
<tr>
<td>--</td>
<td><%#Eval("title")%></td>
<td>
<asp:FileUpload ID="fuVersion" runat="server" />
<asp:Button ID="btnUploadVersion" Text="Last opp" runat="server" OnClick="btnUploadVersion_Click" CommandArgument='<%#Eval("Id") %>' />
</td>
</tr>
</ItemTemplate>
<FooterTemplate>
</table>
</FooterTemplate>
</asp:Repeater>
My code behind
protected void Upload_Click(object sender, EventArgs e)
{
Button btn = (Button)sender;
var documentId = btn.CommandArgument;
//Get the Repeater Item reference
RepeaterItem item = btn.NamingContainer as RepeaterItem;
var fuVersion = (FileUpload)item.FindControl("fuVersion");
var filename = fuVersion.PostedFile.FileName
}
I like to update just the value of my checkbox in a asp grid.
so i thought i bind the id to the checkbox ( but how?) and fire an update in code behind by clicking the checkbox.
but how can I get the ID, and where I have to bind this id to get it in code behind in the event?
Thanks
Here is what I've managed to do. (Be aware there should be an easier way to do this. I'm very new to ASP.NET)
Here you have a TemplateField in a GridView. Inside it there is an UpdatePanel and the CheckBox is inside it. This is done to make the checking of the TextBox do post in the backgroung (ajax). You might not need it (UpdatePanel) at all.
<asp:TemplateField HeaderText="Private" SortExpression="IsPrivate">
<ItemTemplate>
<asp:UpdatePanel ID="upIsPrivate" runat="server" UpdateMode="Always" ChildrenAsTriggers="true">
<ContentTemplate>
<asp:CheckBox ID="chkIsPrivate" runat="server" OnCheckedChanged="chkIsPrivate_CheckedChanged" AutoPostBack="true" />
</ContentTemplate>
</asp:UpdatePanel>
</ItemTemplate>
</asp:TemplateField>
And this is the method that handles this. Notice that I get the Id from the GridViewRow that contains the CheckBox:
GridViewRow row = (GridViewRow)((CheckBox)sender).Parent.Parent.Parent.Parent;
protected void chkIsPrivate_CheckedChanged(object sender, EventArgs e)
{
if (editMode)
{
GridViewRow row = (GridViewRow)((CheckBox)sender).Parent.Parent.Parent.Parent;
Int32 id = (Int32)uxPhoneCallList.DataKeys[row.RowIndex]["Id"];
CheckBox isPrivate = (CheckBox)row.FindControl("chkIsPrivate");
PhoneCall phoneCall = PhoneCallManager.GetById(id);
...
}
}