I have added a calender control to my Webform and on date selection change I have to display the selected date in a label control
<asp:Calendar ID="calendar1" runat="server"
onselectionchanged="calendar1_SelectionChanged" >
</asp:Calendar>
<asp:Label ID="lblInfo" runat="server" Visible="true"
Text="<%#calendar1.SelectedDate.ToShortDateString()%>">
</asp:Label>
But this is not working? Do I need to call any methods in code behind?I dont understand why this is not working.
As noted in the comment section, In your markup add an eventhandler for OnSelectionChanged for the calendar control.
<asp:Calendar ID="calendar1" runat="server"
OnSelectionChanged="calendar1_SelectionChanged" >
</asp:Calendar>
and then in your code behind, handle the event
void calendar1_SelectionChanged(Object sender, EventArgs e)
{
lblInfo.Text= calendar1.SelectedDate.ToShortDateString();
}
As the SelectionChanged event of 'calendar1' is handled by 'calendar1_SelectionChanged',
So, at the code behind, the function should be --->
private void calendar1_SelectionChanged(object sender, SelectionChangedEventArgs args)
{
lblInfo.Text= calendar1.SelectedDate.ToShortDateString();
}
The html markup renders for the first time, and it's done. But, events pertaining to those controls need to be handled in the 'code behind'
Related
I'm having issues with the asp.net textbox within an update panel. It works perfectly fine when adding or removing each individual character but if I highlight all of the text within the textbox, and then remove it a full postback occurs, not a partial postback which is expected.
Why is this happening? I haven't found anything related to this particular problem so it's likely I'm doing something wrong.
Example aspx:
<asp:UpdatePanel ID="updExample" runat="server" UpdateMode="Conditional" ChildrenAsTriggers="true">
<ContentTemplate>
<asp:Repeater ID="rptExample" runat="server" .... >
<ItemTemplate>
<asp:TextBox ID="txtExample" runat="server" ClientIDMode="static" Text='<%# Eval("Example") %>' OnTextChanged="txtExample_TextChanged" AutoPostBack="true"></asp:TextBox>
</ItemTemplate>
</asp:Repeater>
</ContentTemplate>
</asp:UpdatePanel>
Example TextChanged Event:
protected void txtExample_TextChanged(object sender, EventArgs e)
{
updExample.Update();
}
Additional Notes:
Switching UpdateMode to 'Always' doesn't work.
Karthikeyan Nagaraj pointed out in the comments to try adding triggers alongside what I already had. I did in fact already have this, however, I was assigning the trigger in the ItemDataBound event which I realized was incorrect after reinvestigating. The ItemCreated event was much more suited.
I had no issues finding the control in the ItemCreated event, however adding a new async postback trigger to the update panel gave me grief and said the control couldn't be found when changing the text. To resolve this, I used the script managers RegisterAsyncPostBackControl(); method as shown below.
protected void rptExample_ItemCreated(object sender, RepeaterItemEventArgs e)
{
var input = e.item.FindControl("txtExample");
if (input != null) {
ScriptManager sm = ScriptManager.GetCurrent(this);
sm.RegisterAsyncPostBackControl(input);
}
}
I have a RadioButtonList in my site and it has a OnTextChanged and OnSelectedIndexChanged events that for an unknown reason do not fire when the selection is changed.
Here is the aspx code:
<asp:RadioButtonList ID="approvalYesNo" runat="server" OnTextChanged="approvalYesNo_SelectedIndexChanged" OnSelectedIndexChanged="approvalYesNo_SelectedIndexChanged">
<asp:ListItem>No need</asp:ListItem>
<asp:ListItem>Required</asp:ListItem>
</asp:RadioButtonList>
C# Code (not even starting so it has nothing to do with its content)
protected void approvalYesNo_SelectedIndexChanged(object sender, EventArgs e)
{
...
}
any ideas what is wrong here?
put AutoPostBack="true" after runat="server"
So I have this method that should run on TextChanged of a text box:
void CheckIn_TextChanged(object sender, EventArgs e)
{
checkIn.Text += "It Worked!";
}
In the aspx file I have this control:
<asp:textbox runat="server" id="checkIn" ClientIDMode="Static" AutoPostBack="true" TextChanged="CheckIn_TextChanged"></asp:textbox>
All the attributes work as they should except the TextChanged?
But if I remove this from the control and set it in the codebehind on page_load like so: checkIn.TextChanged = CheckIn_TextChanged; it does work?!
So my question is this why does it work when setting in codefile behind but not assigning the attribute to the control in the aspx file? Where am I going wrong?
Event name should be OnTextChanged. (Not TextChanged)
<asp:TextBox runat="server" ID="checkIn"
ClientIDMode="Static"
AutoPostBack="true"
OnTextChanged="CheckIn_TextChanged">
</asp:TextBox>
I am Adding a calendar control to a view. I am using MVC project.
<asp:Calendar ID="Cal" runat="server"
onselectionchanged="C_SelectionChanged"></asp:Calendar>
<br />
Now, where should i declare the C_SelectionChanged method, When the user selects a date from the Calendar this method should get executed. Can someone tell me where and how to add this method ?
You can declare your C_SelectionChanged event on aspx page for this you have to code like this:
<script runat="server">
void C_SelectionChanged(Object sender, EventArgs e)
{
//code here
}
</script>
In a normal ASP.NET website you should set AutoPostBack="true"
webform.apsx
<asp:Calendar ID="Cal" runat="server" AutoPostBack="true"
onselectionchanged="CalSelectionChanged" />
and then add the method that the event will call
webform.aspx.cs
protected void CalSelectionChanged(object sender, EventArgs e)
{
//do some stuff
}
But in MVC it is all another story because you don't have postback, viewstate.
Normal server control are quite useless because they relay on them.
To implement a calendar in MVC try the jQuery UI datepicker.
There you can find a complete code example
I am trying to create an ajax popup calender. So When the user clicks a image button the calender should pop up and the selected date from the calender should be bind to a text box.
This is my aspx code:
<asp:TextBox ID="txtBxDate" runat="server" MaxLength="10" Width="75px">
</asp:TextBox>
<asp:ImageButton ID="ImageButton1" runat="server"
ImageUrl="~/images/toolbox.gif" />
<asp:PopupControlExtender ID="ImageButton1_PopupControlExtender" runat="server"
DynamicServicePath="" Enabled="True" ExtenderControlID=""
PopupControlID="Panel1" Position="Bottom" TargetControlID="ImageButton1">
</asp:PopupControlExtender>
<asp:Panel ID="Panel1" runat="server" Width="200px">
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:Calendar ID="Calendar1" runat="server"
onselectionchanged="Calendar1_SelectionChanged"></asp:Calendar>
</ContentTemplate>
</asp:UpdatePanel>
</asp:Panel>
My Code Behind:
protected void Calendar1_SelectionChanged(object sender, EventArgs e)
{
txtBxDate.Text = Calendar1.SelectedDate.ToString();
}
But when I selected a date from the calender, the selected date wasn't binded to the text box. What I am doing wrong here? or how can I fix it?
The reason it's not updating is because txtBxDate is outside of the UpdatePanel. Either put txtBxDate in the update panel with the calendar, or put it in a separate update panel.
EDIT
After inspecting your code a little more closely, it looks like you're trying to manually create the functionality that's already built into the AJAX Toolkit Calendar control.
See here: Calendar Sample
It seems that you have your targetcontrolid and popupcontrolid mixed up. I think it should be:
PopupControlID="ImageButton1" TargetControlID="txtBxDate"
You can get rid of the code-behind setting the selected date on the text field. The calendar extender should take care of that automatically.