C# - Handling Events Triggered From Controls Programmatically Added To The Page?
Sep 7, 2010
I am programatically adding a control to an aspx page and binding a server side event to an index changed event inside the control. (It's a RadListBox from Telerik's ASP.NET controls) The problem is that on the postback triggered from the control, the event doesn't hit its eventhandler because on the postback the control isn't defined. Is there a way to handle this without having to retrace the logic taken before and rebuild the controls so the events that stem from it are processed?
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Similar Messages:
Mar 19, 2010
I do not know how this has started but when creating new pages in a web project using vb.net coding, when I add any control such as a button or something else and then do to the vb code page for it, I click the dropdown on the left and it does not show the controls. What would cause this? I am using a master page with the page and the controls are going into the content sections. If I add a line like:
Code:
[code]....
then I have events. But in another peoject I do not have to do this. Is there a reason why? Maybe a setting that was changed? I'm using VS2008 in vb.net language.
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Sep 24, 2010
I have created login page dynamically by using texteditor. Which includes 2 texboxes and 1 Submit button.
Im saving this html in database and loading this html in the login page. Means adding this html to DIV tag innerHtml. My question is how to findout these controls in the code behind page and how fire submit button click event. Or any other alternative to do this?
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Sep 2, 2012
i am using gridview to fetch the data in gridview.
even in this lnkfile_click method i am downloading the data but wat is happening data is inserted under two folder so when file is downloading this two folder name is also showing with file name. how can i remove this two folder name and show only file name when downloading.
<asp:GridView ID="GrvUpload" runat="server" AutoGenerateColumns="False" GridLines="None" CellPadding="4" ForeColor="Black"
onrowdeleting="GrvUpload_RowDeleting" DataKeyNames="postedfile">
[Code]....
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Jan 28, 2010
My client wants to pass values through the query string, but they don't want the query string to be displayed in the browser's address bar. The values being passed are for tracking purposes. I know that postback doesn't happen after you click on href link.Is there any way I can get the value out of the query string without displaying it in the browser's address bar? I think this may be impossible, but I may be wrong; I'm hoping to see if anyone has any answers.
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Sep 27, 2011
I am trying figure out how I handle events in a dynamically added user control. Basically I can add user controls dynamically to my form (I am then storing them in an ArrayList in a Session variable that I use to reload them on my Page_Load). Each control has a button on it. However, whenever I click the button, the event never fires (code is never reached). I assume it has something to do with the control being dynamic, and when I click a button, it goes out of scope, and when I reload it something is lose in the event handling.
Here's my code for adding a user control:
Code:
Protected Sub Page_Load(sender As Object, e As System.EventArgs) Handles Me.Load
Dim alContact As New ArrayList
If Not IsPostBack Then
' Dummy controls for testing
Dim oContact As New ASP.ContactControl
[Code] ....
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May 27, 2010
I created a customDropdown usercontrol with Events and It worked fine.
Now I stored the path of the ascx file in the database table and i want to Load the ascx file and handle the Events dynamically in an aspx page.
To Load the usercontrol and access the public properties and method, I need to know the object i am trying to load, right?
For Example
FeaturedDDL c = (FeaturedDDL)Page.LoadControl("~/FeaturedDDL.ascx").
But I dont want to hardcode objectType "FeaturedDDL", coz i dont have that stored in my Database field.
Since I am loading the usercontrol by getting the path and name of the usercontrol from the database table,how will I know the ObjectType at that time?
How to accomplish that and also how to handle the events for these type of situation?
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Oct 16, 2010
How to wire up HTML server controls events?
I added a Input (Text) control in my web form and turned it into an HTML server control so its an instance of HtmlInputText class.
If I double click on the control It only adds a OnClick event handler method inside the script tags in the HTML doc of the web form but how to I get to handle its Serverchange event exactly? does VS.net 2008 has no ability to auto wire up the event to the control, do I have to manually wire up the event handler?
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Jun 25, 2010
I have a DataGrid that has event handlers bound to SortCommand and PageIndexChanged. How can I determine if those event handlers are about to be called, say on page_load? These events will fire just fine after page_load, but I'd like to know at page_load if they are to be fired.
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Sep 1, 2010
The situation:
I have user controls with buttons that have hooked events. Controls with events need to be initialized in Page_Load or earlier.
I wish to spawn these user controls dynamically by clicking an Add button.
It is important to remember that events, such as click events, are not fired until just before Page_LoadComplete.
Broken Solution A:
[code]...
Result: Everything works great, except the button within the added user control is inert.
The conundrum is: I need controls to spawned by a button click, which means I need to put my Controls.Add(...) code in Page_LoadComplete. Inversely, I need the controls being added to have working events, which means the Controls.Add(...) code need to be in Page_Load. I have a perfect dichotomy.
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Jun 4, 2010
I have a user control called ucTriStateButton. It raises an event when it is clicked, called TriStateButtonClicked. If I put this user control on a page, it works fine. Here is the declaration on the .aspx page:
[Code]....
When the button is clicked the method tsbTest_TriStateButtonClicked executes correctly.
The problem is when I put the user control in template field of a GridView.
[Code]....
There is no way to hook the event handler to the control in Page_Load because I cannot get a reference to tsbMorning. So I did it in the RowDataBound event handler of the GridView, where I also do a bunch of other row-specific stuff. Although this builds and runs, the event is never actually subscribed to and so never gets fired.
So the question is - how can I handle an event from many instances of the same user control within a GridView? I am calling the same bit of code regardless of which user control is actually clicked. I only need to know that one was clicked.
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May 6, 2010
I've looked all over for a solution to my problem and i haven't come across a solution that works for me, at least i can't figure out how to make them work for me.I am creating a group of rating controls and adding them to a placeholder. I want to retrieve all ratings and update my database after a button clickall worked wonderfully, i thought i was making some real progress but then i noticed i could not get the value on the server side no matter what i tried... i noticed it's overwriting the value on a postback(i am assuming) i tried adding a if not isPostback statement but then it threw a callback error. anyway here is some code:
Sub Page_Load(sender as object, e as eventArgs) Handles Me.Load
For Each DataRow As Row In DataTable
Dim r As New AjaxControltoolkit.Rating
r.MaxRating = "5"
r.CurrentValue = "0"
[code]...
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Dec 14, 2010
In my table I have 3 fields:
[inFrmDate] (this is the key field), [inFrmData], [totFrmData] (this accepts nulls)When I try to add [inFrmDate], [inFrmData] to the GridView I get the messageto the effect that the:
@inFrmDate scalar is not declared.
But as you can see from below it is declared:
<asp:SqlDataSource
ID="SqlDataSource1"
runat="server"
[code]....
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Jan 21, 2011
I mean, it's easy to add a Button programmactically to an aspx page, but a server control's event handler probably has to be set early in the page life cycle (maybe before Control.Load event). As a result in reality, are dynamic controls rarely added to apsx pages?I wish there is a way to call postback at the server, so that a event is never too late.
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Apr 9, 2010
I've googled a bit for the exact order of all gridview events relative to and where inbetween page events. The only Microsoft article: [URL] is not very clear. I'm especially interested in the gridview row_command event relative to page events.
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Apr 26, 2010
I have a user control say SearchVendor.ascx which contains 4 buttons a gridview and another user control. I need to load the control dynamically actually as a modal pop up
I get this code
var uc = Page.LoadControl("~/blah/VendorProductSearch.ascx") as VPSearch;
uc.ShowVPSearch(true);
_tempPlaceHolder.Controls.Add(uc);
it works fine the control gets loaded properly but onclick of any button the second time the control disappears ?
I want the dynamically added control to remain until the user clicks on the cancel button
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Apr 19, 2010
What will happen if multiple events appear in same time ? Which will be first executed ?? Is there any some kind of "events order" ?
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Mar 16, 2010
I have the usual problem of dynamically created usercontrols not hitting the event handler for a linkbutton inside the control, but I've checked the usual problems and I can't work out what's wrong. I'm calling a function to create the controls at the bottom of my page.load (although I did try page.init as well just in case) outside of my page.ispostback check, and I'm setting the controls id's to a fixed name which is consistent across postbacks. Any ideas what's wrong?
[Code]....
Usercontrol code:
<asp:LinkButton runat="server" ID="lnkDeleteGroup" Text="Delete this group" />
[Code]....
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Nov 19, 2010
I have a GridView with a BoundField column and quite a few item templates like the following:
<asp:GridView ID="gvUsers" runat="server" AutoGenerateColumns="False" OnRowCommand="gvUsers_RowCommand"
OnRowDataBound="gvUsers_RowDataBound" DataKeyNames="UserId" OnRowEditing="gvUsers_OnRowEditing"
OnRowUpdating="gvUsers_OnRowUpdating" OnRowUpdated="gvUsers_OnRowUpdated"
DataSourceID="DataSource1" Width="807px" Height="105px"
[Code]....
While handling the Edit link button I need to use the value in the BoundField, UserName. Unfortunately during the OnRowEditing handler, all strings are empty "". This is also true in the ensuing OnRowDataBound handler for the row in question where e.Row.RowState == DataControlRowState.Edit. Is there a way to obtain this value after the user clicks on the Edit link, and commences the OnRowEditing event?
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Mar 7, 2011
I want to create buttons and text boxs runtime and assigne to asp table.
When user clicks on button text box should be visible and user will be able to type some text and submit to server. This is nothing but something
like Blog. I am able to create asp table, button and testboxes but could not do visibility and events of buttons.
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Jan 4, 2011
I have a div runing on server in which i programmatically add images. On post back, id like to get some attributtes from those images, but they are nowhere to be found. What am i doing wrong?
[Code]....
So i add images as new control under div. But when page posts back, there is no controls in div images.
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Jan 4, 2011
I have a div runing on server in which i programmatically add images. On post back, id like to get some attributtes from those images, but they are nowhere to be found. What am i doing wrong?
[Code]....
[Code]....
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Jan 8, 2010
I have the following code in Page_Init (actually in a function called by Page_Init in response to a __doPostBack call)
System.Web.UI.WebControls.DropDownList ddlGroup = new System.Web.UI.WebControls.DropDownList();
rowString = rowNumber.ToString();
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Sep 10, 2010
I've written a entry form for our company employees to enter marketing courses into the DB and at the same time add them to a Google Calendar. The Calendar is accepting the events, but the coloration of the event is different from a "manually" entered event using Google's interface. This leads me to believe that there is some property I am not setting that is causing the events not to be show on the calendar once it is embedded in our other company web pages.
The code used to enter events:
// Create a CalenderService and authenticate
CalendarService myService = new CalendarService("exampleCo-exampleApp-1");
myService.setUserCredentials("xxx@gmail.com", "xxxxxx");
CalendarQuery query = new CalendarQuery();
[Code]....
And this is the resulting calendar:
The "test event jasdf event" is the manually entered event, and the two events: "Test event 234" are the programmatically entered events. In any case, once I embed the calendar, the only event showing up is the "test event jasdf".
Anyone faced this issue before or had success with google calendar? If so, I'd like to see what you might have used to successfully create events and publish them.
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Feb 1, 2010
For some reason I can't get the button event to fire...
This is my Accordion:
[Code]....
I dynamically add the panes and buttons...
[Code]....
These two should get fired - but they dont:
[Code]....
I read somewhere that I should add the button to the UpdatePanel
[Code]....
But when I do I get this error :
The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).
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