Web Forms :: How To Access A Control Inside A UpdatePanel And PlaceHolder

Jan 20, 2010

I need to access a dynamically created DropDownList from code-behind. This DDL is in a Placeholder, and the PlaceHolder is in a UpdatePanel.

I did the following to try and access the DDL:

[Code]....


But it returns null :( Why does that happen? How can a access the DDL?

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Similar Messages:

Placeholder Inside An UpdatePanel?

Nov 10, 2010

A little pseudo code to provide some background:I have an ASPX with a placeholder and a buttonWhen the button is clicked it adds a web user control (uc1) to my placeholderhe uc has a buttonWhen clicked it adds a different user controls (uc2) to the placeholderStepping through the code, if I look at the placeholder.controls.count before and after the button-click in #4 the count increases by one, as you would expect.The problem is that the uc2 added in #4 doesn't appear on the screen. So, I wrapped my placeholder in an UpdatePanel. I've never used one before. So, I could refresh the placeholder after the uc2 was added.relevant ASPX code

<ajaxToolkit:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server></ajaxToolkit:ToolkitScriptManager>
<ajaxToolkit:TabContainer ID="tcNavigation" runat="server" ActiveTabIndex="0">

[code]...

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AJAX :: PlaceHolder Inside UpdatePanel?

Nov 8, 2010

TThis time I'm facing some unusual behavior with a web page that I'm developing. I have a table with several controls and gridviews and stuff. At some point of the table, i have to show some rows (they were hidden) when the users clicks a button. I was doing this with a PlaceHolder, but now i have to do it without the postback being displayed. I thought: "That should be easy, all i have to do is to put the PlaceHolder inside an UpdatePanel, and that's it" but no, no no nooo!! NOTHING IS THAT EASY!!! It actually works but it puts the hidden rows at the top of the page, not where they suppose to go!!My code is the following:

<asp:UpdatePanel runat="server" ID="uplAutoridadesAmbientales">

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Web Forms :: Label Control Inside A Content Placeholder Using Master Pages

Aug 2, 2010

I am having a slight problem with adding text (output from a stored procedure) to a label control that is nested inside a contentplaceholder (ContentPlaceHolderProductsLeftCol). The page is also using master pages.

Below are excerts of the code - I think I would have to use teh findcontrol property however I am quite lost.

Label name is lastname and is located in ContentPlaceHolderProductsLeftCol

[Code]....

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Forms Data Controls :: How To Add And Access To Placeholder In A Repeater Control

Aug 16, 2010

i want to add and access to placeholder in a repeater control. for example,

[Code]....

how can i acces to placeholder, on codebehind. i couldn't acces with it's id.

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Custom Server Controls :: Property Collections Not Persisted When Control Inside Update Panel And Content Placeholder

Apr 13, 2010

I'm creating an ASP.NET Control which has a property collection for Columns which the user can edit in the Property Collection Editor..

In most circumstances this works fine, the collection can be edited in the designer and the appropriate tags are added inside the control in the ASPX file.

It works fine when

My control is added to the form

[Code]....

My control is added inside an Update Panel

[Code]....

[Code]....

However, if My control is inside a Content Placeholder which is inside an Update Panel, it fails to work as it should. In this scenario, when the Columns collection is edited in the designer, if you then switch back to Source view, the Columns collection is emptied. I have to save the aspx page before switching back to Source view for the changes to be kept.

[Code]....

how to get around this problem? Is there something I may have missed?

Here's the code for the Control

[Code]....

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Web Forms :: FileUpload Control Does Not Work When Placed Inside UpdatePanel

Jul 24, 2012

Following is my html design 

<asp:UpdatePanel ID="up1" runat="server"><ContentTemplate>
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="upload" />
<asp:Label ID="Label1" runat="server" Text=""></asp:Label>   </ContentTemplate></asp:UpdatePanel>

and 

if (FileUpload1.PostedFile !=null) {
//my upload code here....
}

without update panel it works fine.after place all control inside update its not working. How to fix this...

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Forms Data Controls :: Access A Control Inside A Repeater Control And Change Its Properties?

Nov 26, 2010

I need to access a control inside a repeater and change its properties. To enable it or not. I got an erorr message Object reference not set to an instance of an object. Here is my code inside a method. protected void

rptCAP_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
LinkButton lnDel = (LinkButton)rptCap.FindControl("lnkDelete");
lnkDel.Enabled = false; //<<<<< this is where the error occur
}

The name of the repeater control is id="rptCAP"

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Web Forms :: Hooking Dynamic Controls Inside An Updatepanel As An Asynctrigger To Another UpdatePanel?

Oct 7, 2010

I have two update panels and one javascript control.

When the javascript button is clicked, it forces a partial postback on UpdatePanel2. UpdatePanel2 is populated with dynamically created buttons that have javascript effects (jquery) but when click can also induce a postback. My problem is that, when clicking on these dynamic buttons, the whole page does not do a partial post back but rather UpdatePanel2 itself does a partial postback and everything is gone.

However, what I want to do is be able to tie each of the dynamic buttons in UpdatePanel2 (After being dynamically created) and make them an asychnonous triggers to UpdatePanel1. So that when clicking on these dynamic buttons, ONLY UpdatePanel1 is doing a partial postback refresh. UpdatePanel2 stays put and remains the same.

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Web Forms :: Script Inside Updatepanel Disappears On Update Of Updatepanel?

Feb 14, 2011

I have a script inside an updatepanel. This script needs to be inside the updatepanel as it must be located in that spot.

Now when we click the "LinkButton" to update the updatepanel, the script will dissapear.

It seems that the script only is initiazed on the first Page_Load and Refresh of the page.

How can we keep it when pressing the "LinkButton"?

Complete code is below:

[Code]....

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Web Forms :: Access A Control Inside User Control?

Mar 1, 2010

i have a Wizard control with 3 steps, in step 2 i have a formview, inside formview1 a have a label and a button.

When i click the button i would like the label to over wright the text of the label.

how can i access this label.

i tryed this with no success.

[Code]....

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AJAX :: User Control Inside Updatepanel?

Sep 14, 2010

I have a custom control created to autofill the box as typed in. Its working great. But if I put the control inside an Update Panel, it works for the full postback but if partial postback happens (because of the update panel), it does not work.

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AJAX :: How To Control Inside UpdatePanel Menu

May 28, 2010

I started a new project using VS2010. I have a menu control connected with an XML datasource inside UpdatePanel, Menu control works fine, problem is the styling. using a StaticHoverStyle Css works only after the page reloads, when I click a menu entry, the entry is selected but StaticHoverStyle does not reflects the menu items anymore (of course when I hover the items) Same behave with both Net versions 3.5 and 4. When I remove the UpdatePanel the StaticHoverStyle comes back to life ( post back occurs ).

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AJAX :: Literal Control Inside UpdatePanel?

Aug 5, 2010

I should probably say I love these forums, I've been viewing for some time and have found loads of valuable information. I'm having a problem with my project, I have an updatepanel containing several items (Two Daypilot Schedulers and a Literal Control). I have set it to conditional and have it update whenever bookings are added/modified in the schedulers. This all works perfectly! I then have a literal control which contains div items with onmouseover= parameters. The control basically contains a list of pending booking requests. On Page_Load I call a method which populates the list...which works fine.

However, whenever I call the UpdatePanel.Update() method (say, when a booking is added), the schedulers update but the literal control does not. I have gone through the debugger and found that the LiteralControl.Text property is correctly set to the new updated list just before calling the Update() method. So basically it all works perfectly apart from the literal control not updating along with the schedulers in the UpdatePanel.

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AJAX :: Updating Content Within A Placeholder (updatepanel) Using A Timer?

Feb 1, 2011

GOAL: on a web page (vb.net) content in a placeholder will refresh with a different .ascx (user control) every 30 seconds (rotating 3 in total) and of course i dont want to refresh the whole page, just the placeholder.

I'm new at AJAX (that's my first problem - lol)

I set the timer up to call a function, but not sure how to go about refreshing the placeholder with a different ascx file. I'm sure i'll be using UpdatePanel to do this, but haven't been able to figure this out. Easy to replace a value in a label using AsyncPostBack trigger, but nothing on how to achieve this.

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AJAX :: Trigger An Updatepanel From Inside A Listview Control?

Dec 4, 2010

I have a CheckBox that is located inside a SelectItem Template. The CheckBox has Autopostback= true. Located outside the list view is a label. When the CheckBox is checked, I would like to trigger an the Updatepannel that includes the label. Instead I get an error message "'CheckBox1' could not be found for the trigger in UpdatePanel 'UpdatePanel3'. The code snippet is as follows:

Asp.net Markup:

[Code]......

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FileUpload Control Inside Gridview (ajax Updatepanel)

Mar 11, 2011

I've got a fileupload control inside of a gridview so that each row (item from the database) can have an attachment associated with it. I've got a button next to the fileupload control (besides the default browse... button to select the file) to actually take the file and upload it to a file server. This works great if I use this button "Upload". However, underneath my gridview I have another imagebutton that is outside of the gridview, its just sitting on the form / page. The idea of this "Update" button is when end users make changes to the grid I can simply loop through the grid and update the values they have entered to the database. This also works great.

Now here is my issue assume a user has 3 rows in the grid view. On 2 of these rows he decides to add an attachment but he never clicks the "Upload" button he only uses the standard browse button to select the file. Now instead of clicking the "Upload" button that is on the grid view he ends up clicking the "Update" button outside of the grid thinking that it will save his attachments. So I decided to write code to grab the fileupload control from the grid using .FindControls("NameOfFileUploadControl") in my Update button loop where I loop through all the rows. Then I check if myFileUploadControl.HasFile property to see if there exists a file and if there does upload the file then continue with the code.

The issue is when I click this "Update" button .HasFile always returns false even though I can see the text string of the path in the fileuploadcontrol textbox (the standard one next to the browse button). Is it because this goes back to the page load event and checks if it is a post back? What causes this and how can I fix it? Im adding some code because im still confused with this

Protected Sub SaveGrid()
For Each Row As GridViewRow In Me.gvLineItems.Rows
Dim f As FileUpload = CType(Row.FindControl("fuAttachment"), FileUpload)
'todo: this part is not working
If f.FileName.Length > 0 Then 'returns 0 always
'this returns 0.
end if
if f.HasFile() then
'this also returns false
end if
Next
End Sub

This method gets called on a click of a button. The fileupload control is in an of a gridview that is wrapped inside of an UpdatePanel:

<asp:FileUpload Width="90px" Font-Size="xx-small" ID="fuAttachment" runat="server" />

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AJAX :: How To Set MasterPage Only Render ContentPage And Control Inside UpdatePanel

Mar 27, 2011

I have a DateTime in my MasterPage.aspx that is outside of UpdatePanel1. There are two Hyperlink controls inside UpadatePanel1 to navigate or to move to the other pages. Full code of MasterPage.aspx is below.

[Code]....

If the user clicks Hyperlink to navigate or move to the other page, the DateTime will change. It means that my MasterPage.aspx render the whole page when the user clicks Hyperlink. I do not want this behavior. I want my MasterPage.aspx only render the ContentPage and the
Hyperlink inside UpadtePanel1. Controls outside UpadtePanel1 like DateTime should not be rendered again. Please advise the code to achieve my example goal.

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AJAX :: Rating Control Inside UpdatePanel Does Not Refresh The Ratings

May 7, 2015

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<div style="width: 100%; padding-top: 1em">
<img src="Abme/img/rating.png" alt="view" height="25px" width="25px" style="float: left" />

[Code] ....

My ajax rating panel

protected void OnRatingChanged(object sender, RatingEventArgs e) {
SqlConnection con = new SqlConnection(connStr);
SqlCommand cmd = new SqlCommand("Insert into rating(rating,postid) values(@rate,@pi)", con);
cmd.Parameters.AddWithValue("@rate", e.Value);
cmd.Parameters.AddWithValue("@pi", Request.QueryString["ID"]);

[Code] ....

The rating value get inserted to database async but updated rating is not displayed after update. I have to refresh page in order to display updated ratings.

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Web Forms :: How To Access A Child Inside Login Control

Feb 1, 2010

I have one Login control converted into template to customize it. besides two default input text boxes(username, and password), I have added one more as per my need.

the two default controls are easily accessible from underlying code file but I cant take a reference to the control I have added inside Login control. this control is not available in this scope neither directly nor as child control.

I simply want to take reference to this child control.

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Web Forms :: Access And Set Value In TextBox Inside FormView Control

Aug 20, 2013

I trying to save clients IP address who are submitting the data on my website.  I have downloaded an example and implemented. That scrip displays IP address on the webpage. I can submit this to sql table through code behind.  Now I want to use same script in FormView and I am unable to bind this with the text box as it is showing an error "The name IPaddress does not exist in the current context". My code is as under :

<script runat="server">
protected void Page_Load(object sender, EventArgs e) {
string IPAdd = string.Empty;
IPAdd = Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
if (string.IsNullOrEmpty(IPAdd))

[CODE]....

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Forms Data Controls :: DropDownList Inside GridView Inside UpdatePanel SelectedIndexChanged Event Not Firing?

Aug 16, 2010

I have an UpdatePanel with a GridView. This GridView has a template column that is a DropDownList. The problem is that the SelectedIndexChanged event does not fire for the DropDownList. Here is the code:

[Code]....

The codebehind:

[Code]....

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Web Forms :: Nested Master Pages - Want To Know The Aspx Page Canplace Contents Insidethe Placeholder B

Feb 15, 2010

My application has a Parent master page, a child master page and an aspx page( inheriting the child master page)

> Parent master page has two content placeholders ( A and B)

>Child master page uses the content placeholder A and instills two more placeholders ( C and D)

>aspx page can now use C and D naturally

However i would like to know whether the aspx page can place contents inside the placeholder B( which was not used by child master page)

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Web Forms :: Access Controls From Inside Of Templated User Control?

Feb 8, 2011

I'm working on a user control that renders couple nested divs (a rounded corner box to be frank). This is a templated user control, which means that user can put any control he wants into the header, body or footer of this box. Everything is working fine, except the fact that server-side controls can't be retrived from my box. Take a look at this code:

[Code]....

Now codebehind of that control:

[Code]....

I have cut out all the unimportant stuff.Now when I use this control:

[Code]....


I want to access controls in page codebehind file (on Page Load): LiteralNewses.Text="";
but compiler returns an error that LiteralNewses doesn't exist. Also FindControl method can't find this literal.Any tips on what's wrong with this code? According to MSDN, setting TemplateInstance to Single ensures that controls from template will be accessible but not in my case...

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Use Asp:placeholder Inside A Repeater?

Oct 20, 2010

I have a HTML table that is built with a repeater. Sometimes the table has 5 rows, sometimes it has 8 rows.

It was easy to add the header rows.

<asp:PlaceHolder runat="server" ID="additionalHeaderColumns" />

In code behind I added controls (htmlheadercells) to the contentholder:

Dim tableHeaderCell As New TableHeaderCell()
tableHeaderCell.Text = "Test"
additionalHeaderColumns.Controls.Add(tableHeaderCell)

When I try to do the same in the databound event for each row I get an errormessage that tells that its not possible to put asp:PlaceHolder inside the row. it expects tablecells.

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