VS 2010 - Accessing Dynamically Created Controls From JavaScript

Jun 30, 2011

I am dynamically creating controls from javascript. Now i want to access this is server side.

I assigned all the control values from dynamically created controls to hidden field and accessed that in server side. For this i need to create many hidden fields as much as dynamically added controls.

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VS 2010 - Accessing Dynamically Created Server Controls

Jun 8, 2012

Ok, so I'm dynamically adding <input type="File" />'s to the page via button click, client-side via Javascript.

Now when I click the upload button I can access the PostedFiles server side, but I also have radio button lists that I've created dynamically as well with no runat="server".

If I were to .setAttribute("runat","server") for the radio lists I create, is there a way to access that client-side created server control, from the server side?

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VS 2010 - Accessing Data From Dynamically Created DropdownLists

Dec 20, 2012

I have it setup so that when a user selects an item from a DropdownList, that some DropdownLists are dynamically created, based on the results from the Database that are returned after selecting the item in the first DropDownList.

Then, I have a button that takes the data and saves it to an object I've created for this, and I try to iterate through the Controls of the Placeholder that I added the DropdownList controls to.

However, the Placeholder says there are no controls in it, when I press the button, but I can obviously see them there.

Here is some code:

When a "Pilot" is selected, I get all of the Upgrade Types that that "Pilot" has access to, then I create a DropdownList for each type of Upgrade with all the actual Upgrades of that Type:

VB Code:
For Each u As UpgradeTypeList In upgrades           
Dim lbl As New Label           
Dim ddl As New DropDownList            
ddl.AutoPostBack = False            

[Code] ....

Then, when the "Add Squad Member" button is pressed, I am trying to iterate through the controls, pick out any DropdownLists and get the values from them and add them to a List Of in an object for the Pilot info:

VB Code:
Protected Sub btnAddSquadMember_Click(sender As Object, e As EventArgs) Handles btnAddSquadMember.Click   
For Each c As Control In rowUpgrades.Controls           
If TypeOf c Is DropDownList Then               
Dim DoesExist As Boolean = False                

[Code] ....

But, the controls supposedly don't exist and no values get added to the List(Of).

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VS 2010 - Dynamically Created Controls Not Accessible With Client JavaScript

Aug 2, 2012

I've tried creating checkboxes, literalcontrols and textboxes. I need to generate checkboxes dynamically, depending on how many types of <whatever> the user has put in. I know how to do this (I think), but the problem is the controls don't work as they should.

If I create server controls, then for some reason I can't change the value with javascript. If I create client controls, then something appears to happen with the id so the server can't fetch the value (it doesn't recognize the id, allthough it's there in the html)

I can't use a regular checkbox with autopostback because there is to much happening at page load. On other pages on the site, this works, but on those pages the controls are not created dynamically.

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Jun 5, 2010

In my code behind (c#) I dynamically created some RadioButtonLists with more RadioButtons in each of them. I put all controls to a specific Panel.What I need to know is how to access those controls later as they are not created in .aspx file (with drag and drop from toolbox)?

I tried this:

foreach (Control child in panel.Controls)

"test1" and "test2" dont show up in my page. That means something is wrong with this logic.

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Mar 21, 2011

I have a GridView:


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Jul 24, 2010

i have the requirement that to set the 'Timetable' for school..

i need weekdays vertically and periodnames horizentally as headings in the gridveiw.. and with in the gridveiw the client can able get those many periods dynamically with in the dropdown....

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Jan 31, 2012

I dynamically build up a table of dates/hours worked by a user.

Last row, for each date (column) contains a little user control where the user can enter some text.

The user control work with some jQuery/UI and I will end up with each control have a date and reason set in hidden controls.

How do I get hold of these controls only when the user click a button in the code-behind? (silly question I know, but I'm not used to how webforms does its' thing)

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Accessing Controls Dynamically From JavaScript?

Jan 22, 2011

here's what I mean:

I have a few controls, for example,

<asp:DropDownList ID="ddlDate1" runat="server" />
<asp:DropDownList ID="ddlDate2" runat="server" />
<asp:DropDownList ID="ddlDate3" runat="server" />

in my javascript, I want to do something like this:

for (i = 1; i <= count; i++) {
something[i] = document.getElementById("<%= ddlDateRange" + i + ".ClientID %>");

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Jul 29, 2010

i have a link button which i have created dynamically and added it to a div i want to access this link button in some other function in code behind how to do this

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Accessing Dynamically Created Radio Buttons

Jun 16, 2010

On my server side code I create a list of radio buttons with a loop:


The buttons are set to auto post back.On page_load I can get the ID of the radio button that was clicked with:


Now I would like to reference which list item was selected?

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Web Forms :: Accessing Dynamically Created Elements In Server Code

May 8, 2010

I have a page where i am creating a number of <span> elements using clientside code.

I am creating the elements using jquery like this


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Feb 2, 2010

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Assume you have a page in ASP.NET where it makes sense to use JavaScript/jQuery to modify the DOM with values that will eventually be read by the server on submit. For example, you have a form that allows end users to add/remove objects (like dependents on a health insurance form or assets on a loan application). What are some ways to ensure that these items are detected and retrieved by the server once the information is submitted?

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JQuery :: Get Those Elements That Are Created Dynamically Through JavaScript ?

Mar 10, 2011

in an aspx pege, on Page PostBack we generally get thsoe control that were created either in aspx or code behind (dynamic controls ). But in jQuery its common practice to craete new set of controls on the fly. Supose i have created 10 spans with some id and text . So, can we get these spans on server side on Page PostBack ?

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Jun 22, 2010

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Feb 9, 2011

On runtime I am creating table structure using javascript and appending it to the div which is placed in an update panel. Problem here is, when I use asp.net button control, onClick of the button it posts the page to server and whatever javascript tables I have created it goes off. When I use html input button (input type="button") I don't face this problem and tables also stay there. But I have to use asp.net button to take necessary actions on the server side. Is there any way that I can restore the structure or use asp.net button control alongwith dynamic javascript.

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Jquery - Access A Dynamically Created Control Through Javascript?

Sep 25, 2010

I've a JavaScript function in my page through which i make some elements in the page as 'JQuery UI droppable'.

function setDroppableTargets()

But the elements with the class cssDockZone is created dynamically upon user interaction. So in the code behind i create the control first and finally at the end i register a scriptblock which calls setDroppableTargets().

//set droppable targets ClientScript.RegisterClientScriptBlock(this.GetType(), "setDroppableTargets", "setDroppableTargets()", true);

But the javascript function is invoked before the controls are created eventhough i register the script at the end (after creating the controls) and i cross checked it by getting the elements with class name '.cssDockZone' and i getting it as 0.


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Apr 5, 2010

Once again i am faced with an issue. I must allow a user to add as many pieces of data as they wish. I have therefore employed some javascript from an tutorial


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Aug 7, 2010

Let's say I have some HTML and Javascript which adds text fields dynamically to a form:


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Web Forms :: Dynamically Created Javascript To Fellow A Partial Page Update?

Mar 1, 2011

Ive came into a problem when using partial page update. The javascript doesn't fellow. What i want to do is when i call a partial page update some of the update have controls that require a javascript code to be executed. When the partial update is done that javascript isnt here and cannot be found. So what is the best way to make a javascript file to fellow a partial page update ?

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Web Forms :: Use Dynamically Created Controls Such As A Checkbox List And Fill The Values Dynamically?

Sep 28, 2010

I'm creating an quiz application which queries the database and extracts the questions and choices. I use dynamically created controls such as a checkbox list and fill the values dynamically. How do I do this? Right now I have these functions:

array_random_init(); this creates a 10 element integer array from 1-20 - extract_question(i): this extracts a question indexed at i in DB, I created the controls and set the appropriate text in this function. - validate_question(i); this is called by button_click and validates the question i according to DB.

I understand I have to recreate the controls in Page_init on postback, but what should it look like? Do I need to add "if IsPostBack" in page_init, or do I create the controls in page_init() and reset their properties in page_load when I use extract_question(i)? Also, I cannot seem to clear the selected boxes on postback, I added page directive "enableviewstate=false" but it doesn't work.

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Accessing The HTML Markup Of Programmatically Created Controls?

Mar 24, 2010

Is it possible to access the html markup of programmatically created controls, and if so, how?

In c# you can write things like:


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VS 2010 / Accessing Controls On A Page?

Nov 22, 2011

This is my html:

<!-- ADD PRINTER -->
<asp:Panel ID="AddPanel" runat="server" Visible="false" CssClass="aspPanel">
<h1>Add Printer</h1>
<p><asp:Label ID="lblPrinterEmailAddress" OnLoad="ProcesstextValues" runat="server" Text="Common/Label/EmailAddr" CssClass="aspLabel" />


When the user hits the Save button, AddSaveChanges_Click() is called. In that procedure, I want to make sure the user has entered a valid email in txbPrinterEmailAddress. The problem is when I reference RegExEmailValidator in my code behind, I get object reference not set to an instance. This is my code when I detect the invalid email


Logwriter.LoggerWrite(String.Format("Page is NOT valid and {0} is an invalid email id", txbPrinterEmailAddress.Text), "MyLog")
'EditPanel.Visible = True
'ShowListPanel.Visible = False
'AddPanel.Visible = False
RegExEmailValidator.Enabled = True
End If

And my log entries are:

11/22/2011 1:40:37 PM Page is NOT valid and xxxxxx is an invalid email id

11/22/2011 1:40:37 PM EXCEPTION in AddSaveChanges_Click() - Object reference not set to an instance of an object.Why is RegExEmailValidator not an instantiated object?

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Web Forms :: How To Get An ID For Dynamically Created Controls

Jul 20, 2010

I have a tree view with checkboxes for leaf nodes. If i click on checkboxes, I am creating some html controls dynamically. And in other static button click event I need to get an ID's of those dynamically created controls.

My Code is:

<asp:Panel ID="pnlOuter" runat="server" Visible="false" Width="650px">
<asp:Label ID="lblQtnrName" runat="server" Text="Questionaire Name"></asp:Label>
<asp:TextBox ID="txtQtnrName" runat="server"></asp:TextBox>...

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