VS 2010 : Event Handler For Dynamically Created Controls?
Sep 14, 2011
I have to create controls for inputting info to create people objects in the program, because I don't know how many people they are going to input, I have a button that they can press to add more fields.
I need to add a doubleclick event for these dynamic controls (text boxes), how can I create an event for them if they haven't been created yet. Also, as far as I know you cant make a variable part of an object name while declaring it. I need to do something like
Dim dynamicText & (Append variable counter each time a box is made)As New TextBox
dynamicText &variable counter. Name = "TimeTextBox"
dynamicText.Text = "SdgsdG"
dynamicText.Location = New System.Drawing.Point(100, 100)
[code].....
Also is there a way to like copy and paste a group of controls via code instead of having to code each individual one like if I had to do a text box along with a combo box and a lable all at once, can I throw it into something so I only have to recreate the container?
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Mar 4, 2012
I would like to ask a question with DataGridView event handling.The event I am going to handle is the double-clicking of a cell in a DataGridView:If the DataGridView's are statically drawn on the form at design time, then it is easy to assign to each of them an even handler by double clicking the corresponding event in the properties panel.
Private
SubDataGridView1_CellDoubleClick(sender
AsSystem.Object,
[code]....
So basically I have handle to all of the DataGridView's. Is there a way to create a common event handler on this basis?
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Jan 24, 2012
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
[code]....
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Aug 2, 2009
I'm not seeing anything about event handlers for dynamically created controls.. and I could have sworn I had once before. I did see one post about the topic, but it was just replied by asking for some posted code, so as in a preemptive move..
Private Sub buttonCreate()
Dim newbutton As New Button
newbutton.Height = 39
[CODE]...
Here's what I'm trying...
Private Sub newButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles newButton.Click
End Sub
Here's the errors I recieve...QuoteHandles clause requires a WithEvents variable defined in the containing type or one of its base types
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Aug 18, 2009
I have a problem in handling the events for dynamically created controlsI am creating a combobox and a textbox dynamically when i click a Button1 for each combobox there is one corresponding textboxso the number of times i click Button1 i will get that many number of comboboxes and textboxes.i have added an Event handler to handle the ComboBox_SelectedIndexChangedWhenever i click any of the combobox the above event is triggered.So far it is working fine.Now comes the problem i have to get the selected item for each combobox in the appropriate textbox
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
combobox1 = New ComboBox
[code].....
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Oct 16, 2011
I'm new to VB and trying to add a Key(Down? Press?) Handler to a dynamicly created textbox. The error I get is "'KeyDown' is not an event of 'Object'". How do I fix this?Here are the relevant parts of my
Public Class main
Structure square
Dim box As TextBox
Dim guessedVal As Integer
Dim correctVal As Integer
[Code]...
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Jan 25, 2012
I have many textbox controls and they are named as txt1.text, txt2.text, txt4.txt etc.I want to raise the event "Leave" when txt1.text leaves or txt2.text leaves.but with a single handler.
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May 12, 2011
I have a Winform application where i added picturebox's to a flowlayout panel dynamically from code. I have successfully managed to add a handler for doubleclick and click events the problem i have is that when i add both together it only seems to work with the click event and not the double click. where I could bee going wrong? Iam using VS2008 .NET 3.5 my code looks a bit like this :
Public Class Class1
Dim WithEvents picturebox1 As PictureBox
Private Sub Brochure_Creator_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[Code].....
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Nov 23, 2010
I have a TableGridLayout (6 x 6) which host 36 buttons created at design time.From the 36 buttons, only a handfull maybe needed at anyone time depending on data retrieved from an SQL database.Everytime I need to 'clear' the grid to populate with new items, I clear the text of each button, make it visable if required and then upadate with the new text.On every pass if a button becomes active, I add an event handler to the button like this.[code]...
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Oct 20, 2009
Below I create an array of labels. I would like to add an click event to my labels. Can someone point me in a direction?
[Code]...
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Sep 3, 2011
Say I have an object that I dynamically create. For example, say I create a button called "MyButton":
[Code]...
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Jun 8, 2011
i just start programming in asp.net i struggling to add event handler dynamically. here is the scenario when the aspx page is load a link button is add with an event handlerpage load add link button and event handler with link button
Dim products As New LinkButton
products.Text = "Products"
testPanel.Controls.Add(products)
[code]...
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Mar 1, 2012
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.
[Code]...
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Aug 11, 2010
Using ASP.Net MVC1 and am dynamically creating the html in a model that is then dropped into the view and rendered at run time.
My view is a single page that looks like this:
<%@ Page Language="VB" Inherits="System.Web.Mvc.ViewPage" %>
<%=(ViewData("Content"))%>
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.
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Feb 14, 2012
I have added Following HTML in the Form:
<asp:Table runat="server" ID="tblFlightDetails">
<asp:TableRow>
<asp:TableCell CssClass="ASPTableHeader">
<dx:ASPxLabel runat="server" ID="lblFrom" Text="From" CssClass="LabelFont"></dx:ASPxLabel>
</asp:TableCell>
[Code]...
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??
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Jun 29, 2012
I have 4 textbox on my formviz. txtQuantity0, txtRate0, txtDiscount0, txtAmount0When User Press Enter Key on txtAmount0 a new row of textbox is created as follows
txtQuantity1, txtRate1, txtDiscount1, txtAmount1
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Feb 13, 2009
I'm having trouble trying to access a list of comboboxes created dynamically in one procedure from another. I believe I have to add in an event handler but I not sure how this is going to work. Or should I change the array scope?
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
'variables declared here.
[code].....
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Jul 6, 2011
AM trying trap specific events for some controls on a form. i tried this, but its not fireing the events
[Code]...
EDIT I found out that am placing the control in multiple controls, on the form is a panel, inside the panel is different groupbox, these group boxes have the controls am trying to trap their events
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Jun 14, 2011
I have a WPF application that allows users to create questions of all different types which depending on the type will use a textbox,combobox,checkboxes, or radio buttons to allow the user to answer the question after they build some sort of questionnaire. My question is what is the best way to keep track of the answers across all the different controls after the controls are created and the questionnaire is created on the fly. Right now, i'm looping through all the containers and getting the values based on the controlType.
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Mar 11, 2010
I have VB 2008 Express and I am also new to VB. My problem is I cannot find any assistance with creating an Event that is attached to a Control that I inserted on a dynamically creeated TabPage. I call the "create_tab" sub (below) that creates a New TabPage and add some Controls (Button, two textboxes). Now, that I have the TabPage (and there could be multiple), I want to bind an Event to these items. So when a user Clicks on the Button in TabPage1, for example, a Sub executes where I can manipulate the data contents of the textboxes. Here's My code that creates the tabpages dynamically.
[Code]...
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Jan 20, 2012
I'm developing a chat system. In this I'm creating dynamic tab panels in a tab container when I change the selected index of the list box of users. In these tab panels I'm creating 2 text boxes and 1 button dynamically and adding a handler for the button click event. I'm storing the tabid's in the session state and recreating all the tabs in the page_init event. I can fire the button click event in the tab panel, in which I'm unable to access these dynamically created text boxes but I can access a label which I created statically. I used the findcontrol() method but it is showing an error message: "Use new command to create the textbox instances". It is showing something like I haven't created the instances of textbox.
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Jul 1, 2011
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()
[code].....
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Feb 24, 2012
I created controls whith the mouseclick event
[Code]...
It picks up the left mouse key click but none of the others, what did I do wrong?
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Jul 7, 2009
I created a textbox dynamically and I want to have a text change event for this textbox. I know I must use addhandler.
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Mar 14, 2011
In connection with a windows form's text control the keypress event handler provides a key's identity through the KeyChar property of the event argument. This works fine for all alphanumeric keys and Ctl-a ... Ctl-z, Backspace etc. but does nothing for such keys as Insert, Delete, Home, End, and the navigation keys. I would also want to read Ctl and Alt keys combinations etc. I have done these thing before, too many years ago, but forgotten it all. Tried the reference manual, but have not enough years left to succeed that way.
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Apr 21, 2009
I have a website where the user requires to add and remove Headlines from the main page.
The headlines are stored in a database with a column titled 'Display' (true or false) which decides if the headlines appear. I want the user to have the ability to add or remove headlines from the main page, so have created another page which creates a table of all headlines along with a drop down list containing 'Enable' and 'disable'. I want these drop down lists to work by when the user changes the value in the drop down list the database will be updated. Only I cant find how to give the drop down lists an on change event.
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Jul 29, 2011
I've created some dynamic controls on page load and added an event handler to handle the click event of a dynamic link button. Within the sub of the click event handler, I need to reference some other (non-dynamic) controls on the page and change their value. However, I get a null reference exception - object not set to an instance of an object - each time I try to reference a control on the page (in this case label1). What am I doing wrong in creating these dynamic controls or with my event handler?
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
'Get the data to populate the controls
[Code]....
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Dec 5, 2011
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!
[Code]...
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Dec 16, 2011
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)
[code]....
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Jun 9, 2012
How can you add a click event to dynamically created menu item?I thought I could do something like
Loop through all the items in the Menu1.DropDownItems then create a mousedown even on the item and execute an action based off that.I'm new to VB and was wondering what logic to use. Will that even work? How will the events be saved through the life of the application?
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