generate onclick event in image control in asp.net - asp.net

Question

i am have one datalist in asp.net
i m using vb with asp
now my code is just as follow
<table border="0" cellpadding="0" cellspacing="0" >
<tr>
<br />
<td>
Question Number:
<asp:Label ID="Label3" runat="server" Text='<%# Eval("Question_no") %>' />
<br />
Cust_id:
<asp:Label ID="Cust_idLabel" runat="server" Text='<%# Eval("Cust_id") %>' />
<br />
Question:
<asp:Label ID="Label1" runat="server" Text='<%# Eval("Question") %>' />
<br />
Time:
<asp:Label ID="Label2" runat="server" Text='<%# Eval("Date_time") %>' />
<asp:ImageButton ID="ImageButton1" runat="server" ImageUrl="~/ImagesFolde/Chrysanthemum.jpg" Height="50" Width="50" **OnClientClick="s()"**/>
all this in datalist as you can see
so it will be repeated..
i have put one image in it
now i want call a method when any image will be clicked
i make one sub called s() in vb
i want to call it
i use on clientclick() event but doesn't work
what to do?

Answer 1

you use onclientclick - have you made your functions with javascript/jquery ? ( the server side won't be fired)
for instance :
if you call you client method like this :
OnClientClick="return myFunction();"
then your function should be in the header as follows:
<script type=text/javascript>
function myFunction()
{
alert("activated here");
}
</script>

Answer 2

Suppose you have a datalist:
ASPX:
<asp:DataList id="ItemsList" OnItemCommand="Item_Command" runat="server">
<ItemTemplate>
<asp:LinkButton id="SelectButton" Text="Select" CommandName="ModifyRow"
runat="server" CommandArgument='<%#Eval("Id")%>' />
</ItemTemplate>
</asp:DataList>
VB (Code Behind) :
Here I am taking the id from '<%#Eval("Id")%>' and binding some products in bulleted list:
Protected Sub ItemsList_ItemCommand _
(source As Object, e As RepeaterCommandEventArgs) _
Handles Categories.ItemCommand
If e.CommandName = "ModifyRow" Then
' Determine the CategoryID
Dim categoryID As Integer = Convert.ToInt32(e.CommandArgument)
' Get the associated products from the ProudctsBLL and
' bind them to the BulletedList
Dim products As BulletedList = _
CType(e.Item.FindControl("ProductsInCategory"), BulletedList)
Dim productsAPI As New ProductsBLL()
products.DataSource = productsAPI.GetProductsByCategoryID(categoryID)
products.DataBind()
End If
End Sub

Answer 3

<asp:ImageButton ID="imgexpand" runat="server" ImageAlign="Bottom" ImageUrl="~/img/plus.png" OnClick="s" />
you do not need the () in the control onclick statement
this will fire the sub s() procedure in the vb code