Reference Dynamically Created Control In Asp.net 3.5 With VB?
Mar 20, 2011
I'm writing a program that inserts controls onto a webform dynamically. Depending on a variable, I add either a textbox, a set of radio buttons, or a set of checkboxes. Later, after a user clicks a submit button I need to use the controls to determine if the user is submitting the correct answer, but when I try to reference the id of a control, I get "txtAnser is not declared. It may be inaccessible due to it's protections level. Here is the .aspx page (it's the standard content page of a master page):
I can usually find the answers to most of my questions via the Google Gods, but not this time.I have a form that has a TabPageControl and on that page a collection of labels and text boxes via a usercontrol.
On the form I have a button that allows the user to create a new tabpage, when the code adds a new page, it automatically adds the UserControl collection. I can't get my head around how to access the objects on the newly created tabpage.
What I need to be able todo is take the index of the tabpage that has focus and translate that against the UerContol name, but I havn't a clue how to do it!
I am adding a grid of buttons to a form at run-time, and all of then use the same Handler.My question is : Is there any way I canadd the TextBox at run-time ?I know how to but without it on the form, the IDE isn't very happy about the "MyClick" Sub - TextBox1 is not declared......
' some logic here to make nice rows and Columns of buttons ' with different .Text and .Name Me.Controls.Add(btn)
I have created two dynamic objects in my project; one being a button and the other a listview. I have added addHandlers to the button so that I can print out information from the listview. The problem is I don't know how to access the listview through the button_click Sub.[code]...
I have a strange behavior with a dynamically created TextBox-Control. The control is created in the handler of the Load-event of a dialog-form like this:
[Code]...
Now the situation is, that in most cases it works fine. But a few of my customers report that the TextBox not appears on their dialog - it's not there! That's all, nothing more to say.hints or reports about known pitfalls with dynamically created controls which could explain this (sometimes) strange behavior and how I could fix it (I have to create this control dynamically due to some reasons).
BTW: The program is built with Visual Basic 2005. And the customers with trouble are spread about the OS's (XP, Vista, 7).
i been trying to figure out how to get the control name and other properties of a dynamically created control. I have actually dynamically created a label andnamed it. how do i retrieve its name and other properties.?
I am adding some controls to a panel at run-time. After I add them I need to loop through the panel in a different sub and test for a specific control. I was assuming that if I named the variable that the control is set to to "a", that I could then test for this by saying
I'm having a problem with a Web Control that is dynamically created and inserted in my page. I create a couple of LinkButtons, depending on the data of the search that was made, and I'm trying to add an Event Handler to each of the Buttons, so it would filter the result. The controls are initialized properly, but the event is never fired.
Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init Controls.Clear()
I'm new to VB (and .net), just started taking an introductory class. One of the things we've done is set up a little form that does basic math. It looks something like this:
When you click btn1, it adds the values txt1mod1 and txt1mod2 and displays the answer in txt1. The same happens for buttons 2, 3, 4 on their respective lines. So the way we handle this is to have four subprocedures that handle the button clicks, one for each button. I was thinking it would make more sense to have one function handle all of the button clicks, since it's basically the same thing. Through my own research I've learned you can have multiple events call one procedure like so:
Private Sub btn1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn1.Click, btn2.Click, btn3.Click, btn4.Click 'stuff End Sub
But how do I determine which of the four buttons was clicked, and which text box values the user cares about? Then after doing so, how do I reference the relevant controls (txt[x]mod1, txt[x]mod2, txt[x])?
Code: Dim b As Button = CType(sender, Button) Dim t As String = b.Tag.ToString But it gets a little fuzzy after that because I can't figure out how to reference the controls using the tags. I don't even know if I'm going down the right path. I can, for example, set some string to
Code: strBox1 = String.Concat("txt",t,"mod1") 'string is "txt1mod1" for example but trying to reference the control
Code: ...strBox1.Text... gives me errors that, "Text is not a member of String."
Well, I don't know if this is correct or not, but it seems to work if I use "Controls()": Code: 'if t = 1 Dim a As String = Controls(String.Concat("txt",t,"mod1")).Text 'value of txt1mod1 Dim b As String = Controls(String.Concat("txt",t,"mod1")).Text 'value of txt1mod2 Dim s As Integer = CInt(a) + CInt(b) 'im actually determing the operand elsewhere Controls(String.Concat("txt",t)).Text = s.ToString
I am passing some values from a Gridview Update Click event to a popup ASP.net page that dynamically builds a series of textboxes in a Placeholder based on the number of sentences that are found in a specific cell of the Grid Row selected.The boxes that are built represent each sentence found in the cell of the selected row. Each sentence is presented for translation, where user enters data into a 2nd dynamically generated textbox.This all works great.Now I have a Listbox beside the 2nd textbox, which sometimes has 1 or more variables that need to placed into the translated sentence. I have set up a Hover menu over the listbox so that I can select the variable and insert it at the end of the sentence in the 2nd textbox. My problem is generating the click event on the dynamically created Listbox. Something like....
Protected Sub ListBox1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ListBox1.SelectedIndexChanged TextBox1.Text = TextBox1.Text & ListBox1.SelectedValue
I have a few text boxes on my form (txt1, txt2, txt3...) and would like to assign values to them based on the index. I not sure how to describe but Something similiar to the following:
dim i as integer = 30 For n As Integer = 1 To i [txt] & i.text = MyText" & i Next
I have one control named thumbviewer inside repeater. I want to set its imageurl in code. Currently it's done in aspx itself as <asp:Repeater ID="Repeater1" runat="server" > <ItemTemplate> <span style="padding:2px 10px 2px 10px"> <bri:ThumbViewer Id="Th1" runat="server" ImageUrl='<%# Eval("Name", "images/{0}") %>' Height="100px" Width="100px"/> </span></ItemTemplate> </asp:Repeater> How can I set ImageUrl in code?
Code: Public Class Form1 Dim NPB As Button Dim x As Integer
[code]....
As you can see, when I open a program from my menu, a new button will be created with text similar to this, "C:Program ". The button it self will not do anything. How can I create the method at the same time the button it is for is created? Also how can I change the text do that it gives me, for example, CCleaner.exe instead of the whole target path?
i compiled 1 control in vb6. now i'm trying use it in vb2010, but i recive 2 warnings: "Warning1A reference was created to embedded interop assembly 'stdole' because of an indirect reference to that assembly from assembly 'AxInterop.Sprite'. Consider changing the 'Embed Interop Types' property on either assembly.WindowsApplication1" and "Warning2 reference was created to embedded interop assembly 'stdole' because of an indirect reference to that assembly from assembly 'Interop.Sprite'. Consider changing the 'Embed Interop Types' property on either assembly.WindowsApplication1 "why these warnings? (i have sure that in vb6 don't give me any errors)
user control, I'm dynamically creating an arrary of several labels within a groupbox on the controls form. This is done in the load event.The user control is then placed on the form of mainapplication and then run. My problem being that the labels are invisiblen I launch the app. The visible property for the labels is set to true during the creation of the controls.
I have the following code:[code]ok, now in another part of my code (another method) i want to get this update panel and work on it. I want something like: [code]
i want to retrive the textvalue of checkbox whose checked property is true and respective textbox at a buttonclick event. Problem is in finding the controls and their textvalue. any one can help?Thanks in Advance.dt1 is datatable .For window form application.
My current project involves displaying questions/answers from two different databases to be used to compare values and make judgements. The number of questions, choices, and answers is all variable. Thus I am attempting to create labels dynamically to show the information on the screen and create textboxes to leave comments. My problem is not knowing how to then access these lables, since I can't code in to use "label_comments" & (i) as it doesn't exist (at least, I can't get it to work).
First, my code for creating and displaying the information:
db_connection = New SqlConnection(ConfigurationSettings.AppSettings("ConnectionStringMerrill3")) db_connection.Open()
My process is as follows:I access a database table to determine what questions to ask (20-100 questions).Each question is display along with, possibly, a "done" button.My code to do this is as follows:
If datareader("Who_Second").ToString = lbl_Your_Position.Text Then Dim b1 As New ImageButton b1.ID = "btn_second" & datareader("QCC_Q_ID").ToString
[code]....
What I need to do for each button is strip out what the "QCC_Q_ID" is for that button and insert information into another table of the DB.My partial code for this is as follows:
Sub btn_done_clicked(ByVal sender As Object, ByVal e As System.Web.UI.ImageClickEventArgs) Dim MyDate As Date Dim QCC_Q_ID, Position As String
[code]....
Two problems:1. My sub is never being called, so I can only assume that my "addhandler" is not working.2. QCC_Q_ID = e.ToString.... That doesn't seem right - is it? What I need to do is get the name of the button (btn_second13) and get just the number out of that (13). Is there any easier way to keep track of that ID?
What I am trying to do is dynamically create a bunch of dropdown lists and then I want to loop through them and update the database with those values, but the problem I am facing is that I create the dropdown lists, but then when I go back to loop through them they are no longer in the panel. I don't know why but when I am debugging I have a count of 50 controls in pnlTeacherSelect right up until I press the button that calls prcChoose.
This dynamically created content is mostly dropdownlist boxes in the format of
<form method=post action="/questions/nextBatch"> <div id="text">What is your preferred drink?</div> <select>
[Code]....
Is it is possible to perform validation on the dropdowns lists to ensure that a value has been selected? If any of the dropdownlists that still have the default value (the "please make a selection" text) the page is then redisplayed with the font colour of the question or dropdownlist box changed to say red?
I'm from the Webforms world and have made the switch over to MVC (which I really like!) and I know there are some pretty slick validation tools out there but you seem to have to account for them within the view itself.
I cannot pass a HTML helper through the viewdata of the controller as it does not render unless it has been coded directly into the view itself.
Also, I'm looking for a pure asp.net solution as I cannot use javascript due to accessiblity concerns. I can access all the values of the dropdowns without any problems throug the formscollection object but from there I'm a bit stuck.
Now from Serverside code I have added 3 rows dynamically.. when ever page gets Postback.. all dynamically added rows get disappear.How can i get the dynamically added rows after postback??
I have a form which when button1 is pressed creates and displays a new form. From this form a user has the choice yes or no buttons. Each button has its own handler and script it executes. If yes is clicked i want to run the script and then close both forms. I used me.close() and that only closes the orriginal form and leaves the dynamically created on open. If I place a call to form2.close() in the yes handler sub I get an error that it is not declared. How can i close this second form?
