I have a DataList and inside it I have a DropDownList:
<asp:DataList ID="dlconfigureItem" runat="server">
<ItemTemplate>
<asp:DropDownList CssClass="config-select" ID="ddlitem runat="server"></asp:DropDownList>
</ItemTemplate>
</asp:DataList>
How can I get selectedindexchanged event of DropDownList on the server side? I tried this:
public void ddlitem_selectedindexchanged (object sender, EventArgs e)
{
}
but it is not working.
You have defined the server side method:
public void ddlitem_selectedindexchanged (object sender, EventArgs e)
{
}
but you have not told client side that there is an event for you, so in html code tell it like:
onselectedindexchanged="ddlitem_selectedindexchanged"
and also set AutoPostBack property to true.
From the SelectedIndexChanged event the easiest is to cast the sender to the DropDownList
var ddl = (DropDownList)sender;
The sender is always the control that is the source of the event.
For the sake of completeness, from ItemDataBound of the DataList:
protected void dlconfigureItem_ItemDataBound(object sender, DataListItemEventArgs e)
{
DropDownList ddlitem = e.Item.FindControl("ddlitem") as DropDownList;
if (ddlitem != null)
{
// ...
}
}
Edit: Have you forgotten to register the event?
<asp:DropDownList CssClass="config-select"
ID="ddlitem"
OnSelectedIndexChanged="ddlitem_selectedindexchanged"
runat="server">
</asp:DropDownList>
Note that you should not bind your DataList to it's DataSource on postbacks, otherwise events are not triggered. So check for the IsPostBack property of the page.
For example in page_load:
if(!IsPostBack)BindDataList();
Register the event and set AutoPostBack="true"
<asp:DropDownList CssClass="config-select"
ID="ddlitem"
AutoPostBack="true"
OnSelectedIndexChanged="ddlitem_selectedindexchanged"
runat="server">
</asp:DropDownList>
event (on selected index change you can get the selected value)
protected void ddlCategory_SelectedIndexChanged(object sender, EventArgs e)
{
var ddlList = (DropDownList)sender;
string selectedValue = ((DropDownList)ddlList.NamingContainer.FindControl("ddlitem")).SelectedValue;
}
Not sure if you can't get the selected item on the server or you can't find the way to handle the event. In case your problem is with the event handling, try this
<asp:DataList ID="dlconfigureItem" runat="server">
<ItemTemplate>
<asp:DropDownList CssClass="config-select" ID="ddlitem"
OnSelectedIndexChanged="ddlitem_selectedindexchanged"
AutoPostBack="true" runat="server"></asp:DropDownList>
</ItemTemplate>
</asp:DataList>
Related
I have a repeater that in it has one dropdown list and one linkbutton.
I want to get the selected value of the dropdown list by CommandArgument in linkbutton, but it just knows default value of dropdown list.
My code :
<asp:Repeater runat="server" ID="Repeater1" OnItemDataBound="Page_Load2"OnItemCommand="list_ItemCommand" >
<ItemTemplate>
<asp:DropDownList ID="dlPricelist" CssClass="width100darsad dropdownlist" runat="server" AutoPostBack="true" ViewStateMode="Enabled" >
</asp:DropDownList>
<asp:LinkButton ID="btnAddToCart" runat="server" class="btn btn-success btnAddtoCardSinglepage" CommandArgument='<%#Eval("id") %>' CommandName="addtocard">اضافه به سبد خرید</asp:LinkButton>
<asp:Label ID="xxxxxx" runat="server" Text="Label"></asp:Label>
</ItemTemplate>
</asp:Repeater>
Code behind:
protected void Page_Load2(object sender, RepeaterItemEventArgs e)
{
if (!IsPostBack)
{
string id = Request.QueryString["id"].ToString();
DataSet dsselectcategory = BLLTour.left3join(id.Trim().ToString());
var dlPricelist = (DropDownList)e.Item.FindControl("dlPricelist");
dlPricelist.DataSource = dsselectcategory.Tables[0];
dlPricelist.DataTextField = "pricelistPrice";
dlPricelist.DataValueField = "priceid";
dlPricelist.DataBind();
}
}
protected void list_ItemCommand(object source, RepeaterCommandEventArgs e)
{
if (e.CommandName == "addtocard")
{
foreach (RepeaterItem dataItem in Repeater1.Items)
{
Label xxxxxx = (Label)e.Item.FindControl("xxxxxx");
LinkButton btnAddToCart = (LinkButton)e.Item.FindControl("btnAddToCart");
xxxxxx.Text = ((DropDownList)dataItem.FindControl("dlPricelist")).SelectedItem.Text; //No error
}
}
}
I don't know how I should fix it.
You are using very old technology to show data that's not appropriate.
But if you are serious to use it, you must use FindControll method in ItemTemplate of your repeater control. You should find dropdownlist first, and then cast it to a object to be able to use it's value.
Seems simple enough, but I can't figure it out. I've tried this code:
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
foreach (ListItem item in CheckBoxListDivision.Items)
item.Selected = true;
}
}
and this markup:
<asp:CheckBoxList ID="CheckBoxListDivision" runat="server" DataSourceID="SqlDataSourceDivisions" DataTextField="Divisions" DataValueField="Divisions" RepeatColumns="4">
</asp:CheckBoxList>
<asp:SqlDataSource ID="SqlDataSourceDivisions" runat="server" ConnectionString="<%$ ConnectionStrings:WebPortal_Call4HealthReports_ConnectionString %>" SelectCommand="usp_HR_DivisionsSelectAll" SelectCommandType="StoredProcedure"></asp:SqlDataSource>
Thank you for your time and effort.
The reason it's not selecting the items is that Page_Load event is called before binding the CheckBoxList items. So in order to select all the items when page loads you have two options:
First option: Put the same code you're using in the OnDataBound event of the CheckBoxList.
Modify the CheckBoxList markup to this:
<asp:CheckBoxList OnDataBound="CheckBoxListDivision_DataBound"
ID="CheckBoxListDivision" runat="server" DataSourceID="SqlDataSourceDivisions" DataTextField="Name" DataValueField="ID"
RepeatColumns="4" >
</asp:CheckBoxList>
And add this in code-behind:
protected void CheckBoxListDivision_DataBound(object sender, EventArgs e)
{
foreach (ListItem item in CheckBoxListDivision.Items)
{
item.Selected = true;
}
}
Second option: Remove the SqlDataSource from your markup and bind the CheckBoxList programatically in Page_Load event, then after binding the CheckBoxList, do the loop and you'll be able to select the items.
Hope this helps.
i have a datalist contains checkboxlist.
<asp:DataList ID="dtlstfilter" runat="server">
<ItemTemplate>
<asp:CheckBoxList ForeColor="Gray" AutoPostBack="true" OnSelectedIndexChanged="chklist_SelectedIndexChanged" ID="chklist"
runat="server">
</asp:CheckBoxList>
</ItemTemplate>
</asp:DataList>
can i get the rownumber of datalist on the SelectedIndexChanged event of the checkbox ie;if i have checkbox list control repeated 4times and if i check on the second one how can i get the value 2?
You should try fetch parent of checkboxlist like this
Protected void dtlstfilter_SelectedIndexChanged(object sender, EventArgs e)
{
var control= ((Control)sender).Parent;
if(control is DataListItem)
{
int index=((DataListItem)control).ItemIndex;
}
}
if you not get DataListItem as parent then try parent of parent.
U can Try Following. I added +1 as it is 0 based index..
Protected void dtlstfilter_SelectedIndexChanged(object sender, EventArgs e)
{
lblSelectedIndex.Text = (dtlstfilter.SelectedIndex + 1).ToString();
}
I want to do some actions in my database when user change dropdown's selectedIndex.Now I have the following.
<td class="shop-item-qty">
<asp:DropDownList ID="qtyDropDownList" OnSelectedIndexChanged="changeCount" AutoPostBack="true" runat="server"/>
<asp:HiddenField ID="ItemId" runat="server" Value='<%#Eval("GiftVoucher.ID") %>'/>
</td>
All I want is to get my hidden fields value in changeCount method. The problem is that I can't directly get hidden fields value, because this code is in Repeater element. How can I achieve that functionality?
protected void qtyDropDownList_SelectedIndexChanged(object sender, EventArgs e)
{
DropDownList control = (DropDownList)sender;
RepeaterItem rpItem = control.NamingContainer as RepeaterItem;
if (rpItem != null)
{
HiddenField hiddenField = ((HiddenField)rpItem.FindControl("ItemId"));
}
}
You can bind GiftVoucher.ID value to DropDown's custom attribute and skip HiddenField:
<asp:DropDownList runat="server" ID="qtyDropDownList" OnSelectedIndexChanged="changeCount" AutoPostBack="true" data-itemId='<%# Eval("ID") %>' />
protected void changeCount(object sender, EventArgs e)
{
var id = ((DropDownList)sender).Attributes["data-itemId"];
}
I created my gridview with checkboxes inside of it with this code.
<asp:GridView ID="GridView1" runat="server" Width="366px" autogeneratecolumn="false">
<Columns>
<asp:TemplateField>
<HeaderTemplate>
<asp:CheckBox ID="SelectAllCheckBox" runat="server" AutoPostBack="true" oncheckedchanged="SelectAllCheckBox_OnCheckedChanged" />
</HeaderTemplate>
<ItemTemplate>
<asp:CheckBox ID="EachCheckBox" runat="server" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
I tried check/uncheck it.
enter link description here
protected void SelectAllCheckBox_OnCheckedChanged(object sender, EventArgs e)
{
String test = "test";
test = "newtest";
GridView1.DataSource = null;
GridView1.DataBind();
}
But it doesn't trigger any event.
enter link description here
I'm trying to find where my code is missing and searched so far but still can't.
Thank you for your help!
You must use OnItemCreated or OnItemDataBound and link your checkbox with your delegate
void Item_Created(Object sender, DataGridItemEventArgs e)
{
CheckBox cbx = (CheckBox)e.Item.FindControl("SelectAllCheckBox");
cbx.CheckedChanged += SelectAllCheckBox_OnCheckedChanged;
}
The code looks fine and works for me.
I suspect you might be binding the GridView on every postback.
When you click the CheckBox with the event attached it causes the page to refresh. If you bind the CheckBox on Page_Load (or any method that occurs on every trip to the server) it will bind the grid every time you click the CheckBox. In this case it will never get as far as firing your event.
If so, try checking for a postback before binding your GridView.
For example:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
Gridview1.DataSource = myDataSource;
GridView1.DataBind();
}
}