What is the EventName property when I set up a ASP.NET checkbox control as an async postback trigger for an asp.net update panel?
I believe it is CheckedChanged.
All you have to do is set AutoPostback to true and if your CheckBox is within the UpdatePanel you shouldnt have any problems
<asp:CheckBox runat="server" ID="chk_Name" AutoPostBack="true" OnCheckedChanged="chk_Name_OnCheckedChanged"></asp:CheckBox>
Then in the OnCheckedChanged function you can do whatever you need to do
protected void chk_Name_OnCheckedChanged(object sender, EventArgs e)
{
// Do stuff here
}
OnCheckedChanged is the event name. You can autogenerate the method by double clicking the checkbox in the UI, and based on the checkbox name it will generate the method which will most likely be:
protected void CheckBox1_OnCheckedChanged(object sender, EventArgs e) {}
Related
I have user control deriving from BaseUserControl class and Now I need to add button in UserControl file(ascx)
I have added following code snippet in ascx:
<asp:Button ID="btnSubmit" runat="server" Text="Submit" OnClick="btnSubmit_Click"/>
Below is the code sample of ascx.cs file
public partial class MyContol : BaseUserControl
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnSubmit_Click(object sender, EventArgs e)
{
// code to execute after button is clicked
}
}
But here the button event is not triggering and during debug I am able to see its hitting Page_Load event, please help me to resolve on this.
Regards
Anand
I have seen this type of thing many times. Try the following.
Remove the button from the ASCX side of the page.
Remove the C# btn submit method.
Save the page.
Now go into design view...
Add the button back, assign the name in design view.
In Design View double click on the button so that it created the C# method for you.
I have a simple CalendarExtender (from AjaxControlToolkit) attached to a textbox.
<asp:TextBox ID="StartDateText" runat="server" MaxLength="10" Width="70px" AutoPostBack="True" OnTextChanged="StartDateText_TextChanged" />
<asp:ImageButton ID="ImageCalendarStartDate" runat="server" ImageUrl="~/images/Calendar_scheduleHS.png" AlternateText="Click to show calendar" />
<asp:CalendarExtender ID="StartDateCalendarExtender" runat="server" TargetControlID="StartDateText" PopupButtonID="ImageCalendarStartDate" />
In order to control user input, I have the AutoPostBack set to True on the textbox, as well as a function on the TextChanged event (although TextChanged isn't the issue here).
In Page_Load, I have:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
StartDateCalendarExtender.SelectedDate = DateTime.Now.AddDays(-1);
}
}
On opening the page, Page_Load sets the date, but the AutoPostBack triggers a postback right after Page_Load, calling it again with IsPostBack set to true.
Is there a server-side way to prevent this postback?
I tried setting the AutoPostBack property to false, changing the SelectedDate, and setting it back to true, but it keeps firing a postback.
The reason is that because you give the date on the extender, then the extender add it to the text box, then the text box trigger the post back.
How about try to set the text at the TextBox at the first place.
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
// remove that
// StartDateCalendarExtender.SelectedDate = DateTime.Now;
// and direct set it to the text box.
StartDateText.Text = DateTime.Now;
}
}
Maybe you need to format the DateTime the way you want it.
My Scenario,
When i select the option in list i need to perform some action like Textbox should be disabled. But i don find my breakpoint pointing to that action to be performed.Pls help
I guess you mean the SelectedIndexChanged event does not fire that is so because you'vent set the AutoPostBack to true.
<asp:RadioButtonList ID="RadioButtonList1" runat="server" AutoPostBack="True"
onselectedindexchanged="RadioButtonList1_SelectedIndexChanged">
</asp:RadioButtonList>
Code
protected void RadioButtonList1_SelectedIndexChanged(object sender, EventArgs e)
{
TextBox4.Enabled = false;
}
I have a vote button in a repeater and I want to use it by giving the post id which is in the same itemtemplate in a repeater/datalist. I can't pass the value I get from Eval() to the codebehind function because it takes 2 arguments which are sender and eventargs
use OnCommand instead of OnClick:
<asp:Button ID="btnVote" runat="server" Text="Vote" OnCommand="btnVote_Command" CommandArgument='<%#Eval("Column1")%>' />
In the code-behind:
protected void btnVote_Command(object sender, CommandEventArgs e)
{
object column1 = e.CommandArgument;
}
I have multiple user controls on a page and each of them have multiple linkbuttons that perform the same logic on the server side. Is there a way for all the linkbuttons to have the same event handler that is defined in the code behind of the page?
If needed, I can change the linkbuttons to be any other HTML or ASP.NET control as long as it can support a clickable image.
Inside your usercontrol create an event and wire it up. Then call it from the linkbuttons OnClick event handler:
UserControl.ascx:
<asp:LinkButton
runat="server"
id="linkbutton1"
OnClick="LinkButtonClicked">
Click Me
</asp:LinkButton>
<asp:LinkButton
runat="server"
id="linkbutton2"
OnClick="LinkButtonClicked">
Click Me Again
</asp:LinkButton>
UserControl.ascx.cs
public event EventHandler UserControlLinkClick;
protected void LinkButtonClicked(object sender, EventArgs e)
{
if (this.UserControlLinkClick!= null)
{
this.UserControlLinkClick(this, e);
}
}
Inside your parent page wire up the user controls UserControlLinkClick:
protected override void OnInit(EventArgs e)
{
MyUserControl uc = LoadControl("~/PathToUserControl.ascx");
uc.UserControlLinkClick += new EventHandler(MyUserControl_UserControlLinkClick);
}
protected void MyUserControl_UserControlLinkClick(object sender, EventArgs e)
{
//this code will execute when the usercontrol's LinkButtonClicked event is fired.
}
Hope that helps!!
Create an Event/Delegate in your custom control. Then in your page code behind, you can add event handlers or subscribe methods to the delegate.
Link for Events
Link for Delegates
Hope this helps