Web Forms :: Want To Put Code In Dynamically Created Controls?
May 28, 2010
I need to create web controls (e.g. label etc) dynamically.The problem is that for example,
on my onload event, I create a label. The text of the label is read from one line of a xml file.
But sometimes the text should be like " Messages (4)", in which the message count is something not generic and need some logic to calculate. I tried to put things like "Message (<#% MessageCount %>) " in my xml file, but the displayed text label is:
Message (<#% MessageCount %>) instead of Message (4 ).
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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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Mar 24, 2011
Ive been playing around with the default ASP.NET web application template and the following code throws an exception:
Object reference not set to an instance of an object.when clicking the created button.
Note 1: The markup is just a blank page with a placeholder in it - see below.
Note 2: Substituting Button for LinkButton, and the code does not throw an exception and works.
public partial class test : System.Web.UI.Page
{
protected override void OnInit(EventArgs e) [code]....
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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
[Code]....
But this returns a null object everytime. I have tried this code on a span that is on the page at the beginning and it works so i guess its something to do with how im creating the control dynamically.
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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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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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Aug 7, 2010
Let's say I have some HTML and Javascript which adds text fields dynamically to a form:
[code]...
What might the ASP.NET code for capturing the data from these dynamically created text boxes look like?
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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:
.aspx
<asp:Panel ID="pnlOuter" runat="server" Visible="false" Width="650px">
<table>
<tr>
<td>
<asp:Label ID="lblQtnrName" runat="server" Text="Questionaire Name"></asp:Label>
<asp:TextBox ID="txtQtnrName" runat="server"></asp:TextBox>...
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Mar 10, 2010
I was looking through my transcender exam kit for 70-562 and they say load dynamically created controls in the loadviewstateEvent. This should be CreateChildControls() instead, no?
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Jan 25, 2010
i create textbox dynamically (not in page_load)
for example
dim t as new textbox
t.text ="wywyr"
t.id="wrytwry"
panel1.controls.add(t)
after that when i want to get the value from this one i cant.
i searched all the controls that i add into panel1
For
Each Control
In panel1.Controls
Dim s
As
String = Control.GetType.ToString
and it doesnt show nothing
how do i get the value from the dynamically generated textbox ?
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Mar 21, 2011
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. What's the right way to do it?
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Sep 13, 2010
I am building a webform dynamically but when I go to get the values the placeholder has no controls. Every control added has an unique ID. Does anyone know what I am doing wrong (language is C#).
aspx page
<asp:UpdatePanel ID="upShoppingCart" runat="server" UpdateMode="Conditional" >
<ContentTemplate>
<asp:PlaceHolder ID="phShoppingCart" runat="server" />
<br /><asp:Button ID="btnUpdateCart" runat="server" Text="Update" OnClick="btnUpdateCart_OnClick" />
[Code]....
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Feb 14, 2011
I have a website that sales associates access to view account information with clients. S.A's can only view information for accounts that they are tied to. Some clients have more than one account, S.A's can be tied to more than one account, but not all accounts of one client need to be tied to one S.A.
On the account info pages, I have account numbers (dynamically displayed labels) displayed of other accounts that the account client is associated with, which the S.A's can see. I'm modding this so that if the S.A has viewing permissions of any of the other accounts on that list of accounts, that instead of a label being displayed, a button directing them to that account page will display instead. In order for this to work, I have to attach a security function to the button, otherwise the page will blow out on the S.A's.
So I'm running a piece that is displaying a button instead of a label, which is working fine. My problem is when I try to attach the security event to the dynamically displayed buttons. It seems that the page just posts back and doesn't execute my code at all.
On my Page_Load, I'm running this after the buttons and labels are displayed:
For x = 0 to tblAccountList.Rows.Count - 1
'use a try to target the button, use catch to handle if it's instead a label, only one cell per row.
Try
Dim accountLink as Button = tblAccountList.Rows(x).Controls(0)
Addhandler accountLink.Click, AddressOf Me.PermissionViewCheck
Catch ex as InvalidCastException
Continue For
End Try
Next
I don't have any code checking for postbacks or anything like that, but the "PermissionViewCheck" event never fires and just reposts the page.
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Mar 1, 2011
have some code which dynamically generates a number of drop down lists to provide the user with different options. The items in these drop downlists contain a value which is a unique id for that particular combination of options and a text component which just plain text but not neccessarily unique. I then have assigned a handler to these dropdownlists which is called on selected index changed to perform the relevant actions based on what options are selected. The problem is to make the system perform the correct action I need the unique ID from selectedValue of the drop down box but when it posts back it appears the selectedValue has been replaced to match the text of the item.
Dim dynDdl = New DropDownList()
dynDdl.ID = "ddlOpts" & i
dynDdl.AutoPostBack = True
AddHandler dynDdl.SelectedIndexChanged, AddressOf dynDdl_selectedIndexChanged
[code]...
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Sep 17, 2010
dynamically HtmlInputCheckBox created and add in PlaceHolder(panel).
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Dec 1, 2010
What I am trying to achieve:I am trying to take the value of the selected index and depending on what this value is (e.g. the case selection in the code below) run a different query on the dataset and then create a repeater control dynamically to output each row with an item template
that I can use css to style.
In other words: When a user choses a list item it shows only rows from the dataset that match the list item chosen. For example if a user choses Closed Tickets they only see rows from the dataset that have a STATUS of 'CLOSED'.
What I have done so far: [Code]....
What I'm struggling with at the moment is:
1) That the case selection works but the selection of the appropriate data from the dataset doesn't seem to be happening. And this data isn't getting stored in rows as I had hoped.
2) I'm not sure entirely how to display the dynamically created repeater control in the admin.aspx page.
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Jun 29, 2010
I have a page that I am creating 5 separate GridViews on, depending on the button the user clicks, a different GridView will show up. On a few of the GridView's there is a need for paging, so in the CodeBehind I did the following
billingGridView.ID = "BillingGridView"
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Feb 8, 2010
I am new to asp.net. I am trying to display some data from a database table using dynamic table in my page. I want to add checkboxes to a field in the database and would like to perform several tasks based on the values checked. The checkboxes are tied with the primary key field of the database. Here is the code snipet :
[Code]....
Now I have a button in my page. The functioanlity which I desire is on clicking that button I should be able to extract the values of checked checkboxes and perform some function.
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Nov 1, 2010
I have created one user control in which I have taken a gridview. Columns of this gridview are getting generated dynamically. (i.e. I read Column name from Xml file) But now I want my first coloumn of this gridview as a checkbox field.
I am giving my code snippet for reference.
This is function to create Grid.
[Code]....
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Jan 11, 2010
I have a database with some data in. Now I'm trying to show that data on my page whit a ListView.
For each object from the database a ListView will generate a dropdownlist.
I also have a DataPager on my page and this is where the problem occurs.
Each object generated from the database has a field that may look like this example.: 1,2,3.
In my code now I´m trying to split this string of comma character and add new items to my dropdownlist.
This works as long as I do not have DataPager on. But if I choose to view an x number of pages at the time when the page loads, I have value in the dropdownlists, only on my first page.
A piece of my code:
[Code]....
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Jun 17, 2010
I just can't wrap my head over this and don't have enough time to read long articles.
I already have an HTM Table on my form. I dynamically create New Roows and Cells and keep adding them to the Table .
The cells Contain Labels, Textboxes, Drop downs and Buttons. I also add Handlers to the dropdowns
The form loads perfectly the first time. But when I change the value in a drop down, on the postback, I get a msg saying that " There are multiple controls with the same name 'txtCheckin' . How do I handle this?
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Jan 28, 2010
i am adding rows and cells dynamically to asp table control...and i wish to put extract a particular cell's of the row when clicked ...
i.e. on clicking on a particular row ..say i need its 2nd col's value to be passed as session variable for inter page communicaton..
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Mar 4, 2011
I want to create a gridview with the first column being the Job Number and then a variable number of subsequent column which are fordates. This grid is a data entry for hours worked on a particular date for a particular job. I wrote the code to get the correct number of columns and column headers but I am having trouble getting textboxes into the grid cells.
public partial class _Default : System.Web.UI.Page
{
#region constants
[code]...
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Jan 10, 2011
i am working on Accounting software.in this software i am to implement voucher entries form.In this form on page load a table (two rows and four columns) should be created after that one row should be appended to that table dynamically on button click event.
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Aug 9, 2010
I have a listview control which is created dynamically, it is nested inside a repeater's itemtemplate. I'm trying to attach a datapager to it, which is also created dynamically but the datapager will not display and the listview will just display all its records in its entirety.
[Code]....
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