AJAX :: Dynamically Adding Controls To A Page With An Updatepanel?
Nov 14, 2010
I am dynamically adding controls to a page with an updatepanel. The controls do trigger a post back but their events do not fire.
For example:
LinkButton link =
new
LinkButton();
link.Height = 45;
link.Width = 250;
link.Font.Underline =
link.Font.Bold =
link.ValidationGroup = "NoValidation";
link.Click += new
EventHandler(EventDoesNotFire);
I have set a break point on the Load_Page and in the EventDoesNotFire method. The Load_Page fires, but it never enters the EverDoesNotFire method.
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Similar Messages:
Jul 26, 2010
I have gone through several posts on this forum about adding a linkbutton to an updatepanel dynamically. A lot of them say just give it a unique ID and some say you have to register add an AsyncPostBackTrigger to the triggers collection. I have tried both and neither work. I have this simple test that I created - the code is below - there is nothing else in this project but the code you see so I know nothing else is interfering with it.
I have also seem people complaining that the linkbutton causes the entire page to postback - in my case nothing happens... I have seen people talk about having to add the triggers on the page init however I can't do that - I am dynamically creating menus based on a selection in a listbox... (not in this simple test but in a larger project) I am using Visual web developer express 2010 if that makes any difference.
[Code]....
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Jan 20, 2011
I have a page with a ScriptManager, a generic HTML drop-down list (<select>), and an UpdatePanel. The UpdatePanel contains a PlaceHolder (for now). During Page_Load, a number of user controls are added to the PlaceHolder (really, it's several instances of the same user control). The number to add is not known until the page loads, so they do need to be loaded dynamically. The drop-down list is populated with the same number of menu items, and there is javascript on the page also (using jQuery) to show only one of the controls at a time depending on the state of the drop-down list.
Each user control has two buttons that should generate an asynchronous postback, a drop-down list that should generate an asynchronous postback on a change in selected value, and a button that should generate a synchronous postback. If I was not generating the controls dynamically, and if there was only one control, the structure would be something like:
[code]....
Of course, all the controls inside the ContentTemplate would actually be part of each user control.
Adding the triggers on the server side does not seem to work because no ControlID seems to the UpdatePanel find the relevant controls. I can use either the control's ID or the control's UniqueID, and it does not work, and I get an error along the lines of
A control with ID 'ctl00$ContentPlaceHolder1$ctl01$asyncButton1' could not be found for the trigger in UpdatePanel 'myUpdatePanel'.
So, I wonder if I need to register the triggers in the client instead using ASP.NET Ajax. I found this page that basically explains how. However, I do not know how to get the EventName taken into consideration. The examples I have seen so far have merely been adding button clicks, but I don't know how to handle the SelectedIndexChanged event from the DropDownList.
Are there examples out there I have missed? It doesn't , of course, that the method in the link I gave appears to be "unofficial," so I don't see any MSDN documents on the subject.
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Feb 6, 2010
Here is what I am trying to do. I have a page with two link buttons and an updatepanel (the two linkbuttons trigger the updatepanel). I have two usercontrols which have labels with same ID's. When I click the first link button, I add the first usercontrol to the updatepanel and set the label value to datetime.now
when i click the second link button i add the second usercontrol but i see that the value of the label from the first control is set in the label in second user control. if the id's are different there is no problem - but in my case the usercontrols are being developed by different teams and I am integrating them in the way i mentioned - so they may have same ids.
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Sep 10, 2010
I got an updatepanel which contains a normal panel on MasterPage. The updatepanel does not contain content place holder. On the content page, I have to add triggers to updatepanel for buttons that are dynamically created on "page_load" event. The problem is that, since the page_load event of content page is being called before master page's page_load event, UpdatePanel is not being created. So that, whenever i try to add triggers in page_load event of content page, i got an error like "A control with ID 'ctl00$editableContent$ctl42' could not be found for the trigger in UpdatePanel 'up1'."
The code below is for adding triggers to updatepanel for buttons.
MasterClass master = (MasterClass)Page.Master;
AsyncPostBackTrigger trig = new AsyncPostBackTrigger(); [code]....
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Feb 20, 2010
I am adding controls dynamically in my webpage.
I add them in onload method.
everything is working fine..
But I m a bit confused about how it works..
I have read in so many articles that all controls get their values from viewstate before load event. Then how my dynamically added controls get their values when i am adding them in OnLoad event ie after LoadPostData event.
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Jun 25, 2010
This is what i am trying to do with asp.net updatepanel.i have button and a panel inside my updatepanel. when the button inside the updatepanel gets clicked i want to dynamically add new controls such as LinkButtons to my panel1 without full post back. Now when the dynamically added controls gets clicked it causes a full post pack and also not calling "LinkButton1_Click" event. i am sure i am doing something wrong here.
[Code]....
[Code]....
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Feb 11, 2010
I am using jquery ajax method to get data from a web method and present data using DOM(similar to that of google search results).B'coz the data returned from the web method is huge I want to paginate the results.For that I need to create buttons corresponding to the page numbers based on the no. of records the web method retrieves from the database.So I have taken a div on the page.In the web method ,as soon as I can find the number of records obtained from the database,I want to create the buttons and add to this div and display 10 records per page.As far as I know, it is not possible to access anything that is placed on the asp.net page from Web method.In that case how do I paginate the results?
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Feb 6, 2010
I need to set some attributes on user controls that I'm dynamically adding to a page placeholder. Is this possible?
[Code]....
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May 24, 2010
Adding user controls dynamically to aspx page
[Code]....
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May 12, 2010
I am trying to dynamically add a queryextender expression to the page. something like, when the user clicks a button, we need to add a OrderbyExpression. The following is the code used. It works when added in Page_Load but doesn't when added on a button click event. Upon button click the page just reloads and ignores the filter condition.
OrderByExpression obex = new OrderByExpression();
obex.DataField = "ProductName";
obex.Direction = SortDirection.Descending;
ThenBy tb = new ThenBy();
tb.DataField = "UnitsInStock";
tb.Direction = SortDirection.Ascending;
obex.ThenByExpressions.Add(tb);
this.q.Expressions.Add(obex);
where queryextender1 is the ID of the queryextender
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Mar 11, 2010
I am currently using a asp.net 2.0 with visual studio 2005.
I am trying to build a web application using ajax.
but when I drag the ajax updatepanel on asp.net page it is not resizable,so how should i put other controls on it?
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Apr 26, 2010
[Code]....
I have an update panel and inside there are a button i want when i press the button the content well be cleared and then a label will be added to the update panel dynamicly and focus that the button is inside the update panel
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Jan 16, 2011
my problem is it that i when loaded usercontrol in Updatepanel dynamically,so can not execute javascript or jquery code in second usercontrol.
"EconomicBongah.ascx" UserControl work correctly, because that this usercontrol loaded in Page_Load Event for the first time.
when i click on the btn_Article,"EconomicArticleMarket.ascx" UserControl Get loaded, but with the first user control code will interfere,and therefor Javascript or jquery code in second usercontrol can not execute, and encounter with error in Jquery-1.4.4.js file.
i loaded usercontrol dynamically in this case:
[Code]....
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Jun 1, 2012
Ok, so I'm adding linkbuttons to a page dynamically on page_load.I had it to where the link buttons were redirecting to a page with a query string attached. I was attempting to use the AjaxToolKit's AjaxFileUploader and ran into issues with existing query strings.
So what I'm trying to do now is handle the click event of the linkbutton server side, set 2 session variables and then redirect the page to the same page, but with out appending a querystring so the ajaxfileuploader will work correctly.Here is my linkbutton code:
vb Code:
Dim Lin As New LinkButton
Lin.Text = dr("DeptDesc").ToString
Lin.CssClass = "deptlink"
Lin.ToolTip = CDate(dr("MeetingDate").ToString).ToFileTime.ToString
'Lin.OnClientClick
[code]....
I know I have Lin.PostBackURL and Lin.setAttribute(...). It didn't work with just setAttribute and I saw a post online about someone setting the PostBackURL and it working...
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Mar 9, 2010
I have some code that I am working on that uses an UpdatePanel and some dynamically created buttons to perform functions. The problem is that the dynamically created buttons aren't working the same as my test static button, which is behaving exactly as it should be.
So I was wondering if someone would be willing to simply post an example (in VB.NET or C# please) of the following:
An UpdatePanel has a Label and a Placeholder inside of it
The Placeholder has a dynamic button added to it
Clicking on this button will make the Label say "Hi" without performing a full page postback.
If I can just get that much to work, I am sure that the rest of the code will be fine. I just can't seem to get my dynamic buttons to act like my static ones do in an UpdatePanel.
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Mar 22, 2010
I'm going through the tutorial on this page, but when I programmatically add the second AccordionPane, the program went wrong. Following is my code and error message.
[Code]....
The error message is: Multiple controls with the same ID '_header' were found. FindControl requires that controls have unique IDs.
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Dec 9, 2010
I have the following code which adds a label and a gridview to an asp.net page:
GridView grd = CreateGridView(kvp.Key.Text);
Label l = new Label();
l.Text = "some text";
l.CssClass = "this has no effect";
placeHolderResults.Controls.Add(l);
placeHolderResults.Controls.Add(grd);
Two questions really:As the page will have a multiple and unknow quantity of Label + Grid pairs I'm looping through the above code, is this the best way to add the controls to the page?I cannot style the label? How do you do it? Looking at the HTML which is created, the label turns out to be a SPAN.
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Aug 13, 2010
What I am trying to do here is I want to add the dynamically created labels in the Panel on the Webpage and not directly on the Webpage. My panel has scroll bars and thus when I scroll horizontally or vertically only the background moves whereas the labels are static to the page.
And some labels are even visible on the panel borders on scrollbars (some on the page outside the panel) which are suppose to be placed inside the Panel. So when I scroll either of the ways even the labels should move along with the background image.
So how can I make these labels stick to the Panel and not the Page? How do I do it?
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Jan 24, 2010
dynamically adding validator callout extender
Button button = new Button();
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May 5, 2010
Okay, this is a continuation of a previous question of mine, but it is distinct enough to be its own question. Based on user interaction, I'm calling a .ashx handler via a jquery ajax call, and that handler is building some html for me that includes some Telerik controls like a masked textbox (masked for a phone number like "(###) ###-####".
I got around all the hurdles of using Render() to get the html output of a server control even when it doesn't have a "Page" object or a ScriptHandler object.However, when I show the control to a user, I see the mask in the text of the textbox, but the mask doesn't "work" in the sense that when a user starts typing, it is as if the mask is really just text.
So, my question is, after putting the html code out for a masked textbox, how do I tell whatever javascript is supposed to mask the input to really start masking on that specific control?
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Nov 3, 2010
I have a usercontrol (ascx) that I want to dynamically add to a page.
Neither the control nor the page has a namespace (thanks crappy vendor).
When I use the following, it tells me it cant find the "type or namespace"
StayTunedControl = (UserControler_StayTuned)LoadControl("~/UserControler/StayTuned.ascx");
Page.Controls.Add(StayTunedControl);
StayTunedControl.StayTunedID = Convert.ToInt32(IncludesStayTunedMeta.Value);
After some tweaking to the namespaces, etc, I am now at a point where the 3rd line above generates the following error:
'System.Web.UI.UserControl' does not contain a definition for 'StayTunedID'
I was hoping that casting StayTunedControl as type (UserControler_StayTuned) would fix this.
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Feb 24, 2010
My C# web app requires the user to enter automobile information. The user can add information for one auto, or more (max 20).
My page has these text fields: Car Number, Car Make, Car Year, Mileage, VIN I have a button that allows the user to "Add More Cars" is to allow the user to add more than one car.
When the user clicks "Add More Cars", how can I dynamically display the text boxes, and keep track of how many cars the user has added (in order to load them to an array and write to database)
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Dec 3, 2010
As per my need I want to dynamically load accordion pane and inside that I want to load an ascx control. I am attaching my code for reference. But when I run my code it does not create separate pane.
Sample Code part:
protected void Button1_Click(object sender, EventArgs e)
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Nov 19, 2010
I have added some combobox and texboxes in gridview dynamically to provide the data entry like operations.i have fetched and reset the value of these dynamically added controls on button click as ->
[Code]....
[Code]....
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