Loading User Controls Programatically Into A Placeholder (asp.net)?
Apr 15, 2010
In my .aspx page I have;
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" AspCompat="True" %>
<%@ Register src="Modules/Content.ascx" tagname="Content" tagprefix="uc1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
[code]....
The result is an empty placeholder and no errors. P.S after Fat_Tony's answer I changed the code to;
Try
Dim loadmodule As ASP.ContentModule
loadmodule = CType(LoadControl("~ModulesContent.ascx"), ASP.ContentModule)
[code]....
But still no results unfortunately.
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Nov 19, 2011
After taking a few years off from programming, I decided to start learning vb.net. I have created a user control that contains a picture box. I added some custom properties to the picture box that will hold general string data from a database.
My problem is that the user control is programatically created during run time, and during this time a DoubleClick event handler is added for the picture box that is within the user control.
I need to be able to set the custom properties for the picture box during the creation of the user control, so that when the control (picture box) is double clicked I can read these values but am unsure on how to access them.
The picture box is the entire size of the user control, or I would just add the custom properties right to the user control and add the DoubleClick event handler to that. However, double clicking needs to be done on the picture box since it takes up the entire user control, unless anyone has an idea to trigger the DoubleClick event of the user control when the picture box is double clicked.
[Code]...
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Sep 19, 2011
Within my webpage I am loading usercontrols within a placeholder. Each of these user controls triggers a postback when an ajaxcontroltoolkit rating is changed. The problem I am having is that if I use [code]The Load_EvaluationList is what loads the user controls, if I place the IsPostBack check around those two, the controls disappear, what could be the problem
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Dec 14, 2011
I'm working with ASP.NET and VB.NET. I have a page which contains 5 user controls. the page itself does nothing, it just presents the user controls to the user.
The user controls work fine when I come on the page, or when I refresh, but when I go to another page, and press 'Back' only two of my user controls shows up, and they don't work like they're supposed to!
Short description of the controls:
2 controls which look if the user has to create something and shows an option to do so. (goes to the DB)
2 controls show an overview if needed (goes to the DB)1 control looks if the user is an admin (does not go to the DB, but looks in the securityContext)
[Code]...
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Jun 2, 2011
I want to add my custom controls to the visual studio toolbox programatically (not manually by selecting "add items") with my own tab.How can I achive it? Is there any registry entry where all the Toolbox items are entered to be able to view in the toolbox? where exactly the toolbox items list is stored?
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Aug 23, 2011
There is newer code in a follow up post. I suggest using the code in the later post rather than the code in this one. You can still read this post though. When designing a user interface, one should be conscious of how many individual controls are required to implement the functionality. In some cases an initial design may begin with many buttons or textboxes (for example) but then further review of
the actual required functionality allows for a reduction in the number of unique controls.
But other times, there isn't a better way (which will still make sense to the user of the application) then to have a series of many repeated controls. So in the cases where one can be certain that the best UI implementation for an application will require the use of multiple copies of a given control, then it often becomes necessary to maintain some method of managing all of those controls at various points
throughout the application. Doing so typically requires that one build up some collection of controls which can then be accessed by index in order to work with any given control; but this can lead to a lot of clutter in the code file which handles these control's events. For instance there will be some kind of collection declaration, some recursive routine to find all of the controls of interest, and then any number of event handler methods with long lists of Handles clauses, or additional code loops to wire up the event handling for each control.
Purpose Since most of this functionality could be considered a requirement regardless of the type of control being managed, or its required functionality, it may make sense to wrap all of the control management functionality into a single class. And since our first requirement is a collection of controls, then a base collection class could be the perfect starting point for our control manager. There are a number of existing thread around this topic, with some recent (at the time of this writing) ones being:[URL]..In this, and related, threads I have posted examples of a simple TextBoxManager and ButtonManager control. But again, with so much similar functionality required regardless of the control being managed, it would be technically possible to create a generic ControlManager(Of T As Control) class which can manage any type of control.
[Code]...
So in summary, one can facilitate managing a large number of user interface controls by building a "control manager" class which both encapsulates the list of control instances, and deals with adding and removing defined event handlers for every control it manages. The generic control manager class itself can be inherited and extended into a more specific class on a per-application basis in order to provide more application-specific functionality. Reed Kimble - "When you do things right, people won't be sure you've done anything at all"
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May 14, 2010
I'm rewriting a vb6 program in vb.net, and I was wondering what the best alternative is to vb6's "load"/"unload" commands for loading and unloading controls on a form.
e.g. (VB6)
Unload frmContainer.DetailGrid1
Load frmContainer.DetailGrid1
Currently I am adding/removing controls using
[Code].....
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Sep 27, 2011
I have some custom user controls in my .net winforms program that do not display correctly when the user has selected larger text size. This setting:
My controls look like this:
Instead of like this:
The bill to area and ship to area are both custom controls. I don't know if this is contributing to the problem but I do have code in each to scale the phone/fax areas to stretch nicely, like this code from the bill to control,
Private Sub panFaxPhone_Resize(sender As Object, e As System.EventArgs) Handles panFaxPhone.Resize
panFax.Width = (panFaxPhone.Width / 2) - 1
panPhone.Width = (panFaxPhone.Width / 2) - 1
panFax.Left = panFaxPhone.Width - panFax.Width
End Sub
How can I get my controls to size correctly while still respecting the users choice for larger text (I don't want to just set the AutoScaleMode to None)? After playing with this for a long time it seems to be a problem with anchors in the child controls. See this below image, the inner black box is the control with its border turned on, the text boxes (like name) are anchored left and right and should stretch to fill the control, but don't.
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Jun 2, 2012
i have a windows from project and in that project i created a user control lets call itcustombutton1 now i can use that control quite easily either at design time or runtime by creating a new instance of it like
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Jan 21, 2010
trying to load a string that's in xaml format (to preserver formating) from an sql server db into the Windows.Controls.RichTextBox. I'll also be wanting to save to the db. I'm able to save and load to file by using a filestream and textrange but I'm having trouble figuring out how (and finding online samples) of how to go to and from a db. I've also tried using the .text property of the RTB but here i see the raw xaml text; the rtb didn't render the xaml.
Private rtb As New Windows.Controls.RichTextBox
If System.IO.File.Exists("D: est.xaml") Then
[code].....
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Mar 14, 2011
im toying with an idea based round having controls end user movable at runtime, and having a function to save the current position/location of all the controls, so then i can skip through presets i already made as it were. Ill be using .ini files eventually (just testing with txt files to check it was a valid aproach) I can get all the info i need into the txt file, the problem is how to read it back into the app?
[Code]...
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Dec 2, 2009
How many controls can I have before I should start looking at user defind controls because of too many controls making my program go slow?
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Jan 9, 2011
I am new to MVC.I have a string that I built from a controller called parsedCustomerNames. In web forms I can make the placeholder visible from the codebehind and then populate a control with the string. How would I be able to do this in MVC.
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Sep 16, 2011
I have a UserControl.ascx which essentially outputs the Name and Email of the user currently logged in (stored in session variables, for the record) at the top of every page on my website. Said control is currently called by Site.Master using <%Html.RenderPartial("UserControl")%>.
It works fine when I log in for the first time and my details are displayed correctly, but when I log out and try to log in again something strange happens...
The Control itself tests the condition Session("auth"), which my controller sets to true upon authenticating a user and which it forces to false when the logout button is pressed. All session variables are cleared upon logging out.
(For the record, my user control used to check Request.IsAuthenticated rather than Session("auth") to determine the current Session State. The same issue arised.)
The problem is that when I try to log in as a different user, instead of showing the new user's information in the header, nothing appears beside Name: and Email: (see code below). I suspect this is because UserControl.ascx is not updating its state.
Ideally, I'd like a solution which would force UserControl to check Session variables every time a page is loaded. Is there a clean way to achieve this?
<%@ Control Language="VB" AutoEventWireup = "false" Inherits="System.Web.Mvc.ViewUserControl" %>
<%-- The following line works around an ASP.NET compiler warning --%>
[Code].....
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Mar 11, 2010
I have a repeater and within that repeater, I have an item template. Now this template is formatted with a couple of tables, but for this question I have removed them to make things easier to read:
<asp:Repeater ID="Repeater1" OnItemDataBound="R1_ItemDataBound" runat="server">
<ItemTemplate>
<asp:PlaceHolder ID="phAnswers" runat="server"></asp:PlaceHolder>
[Code].....
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Mar 16, 2012
[Code]...
In other words the values of the last row used are stored in every key, value dictionary combination. How do you prevent this from happening? It is clearly associated with the use of the temp variable, as the dictionary changed as the temp variable changes. Is there a way to only copy the values from the array rather then associate the dictionary with the changing values of the array?
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Mar 4, 2009
I have an asp program that needs to validate data for textboxes that are dynamically created and put into a placeholder. Each textbox has to have a value when the user hits the Save button. I have the following code:
Dim testCheck As Boolean = True
For Each txt As TextBox In pnlTests.Controls
If txt.Text = "" Then
[Code].....
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Apr 8, 2011
I have a particular link that I'm trying to convert to an ASP:LinkButton place holder so that I can control it's visibility based on the user type:
<asp:LinkButton id="linkColumnsSelect" runat="server" Text="Select CSV Columns for Export" Href="javascript: void(0)" Visible="True" />
I was able to remove the PostBackUrl by adding "javascript: void(0)" to the Href property, but now I have the problem of getting a real ID that I can use in javascript. As it currently stands, this creates an ID for the item of ctl00_ContentPlaceHolder1_linkColumnsSelect, however I need that ID to be "linkColumnsSelect" on the client side and still work server side (for jQuery coding reasons that involve looping). Is that possible? Or do I just need to adjust my jQuery to account for the placeholder segments of IDs?
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Nov 1, 2010
I have a page that includes javascript which I only want to run under certain conditions. To do this I have placed the scripts into an asp: placeholder.This actually seems to work but when I run a debug on the page I get the following warning.Element 'placeholder' is not a known element. This can occur if there is a compilation error in the Web site, or the web.config file is missing.If I move the placeholders into the body of the page the warning goes, but that means I'm left with scripts in the body which I also want to avoid. Does anyone have any hints on the best practice for this scenario? [code]
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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 placeholderThe uc has a button
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Jun 22, 2010
Ive been working on a checkbook application for my visual basic class and I'm a little stumped..
To preface, the values I need to mess with include:
transaction type (checking or deposit)
DTP
check number ("dep" if deposit)
[Code].....
Below is the Change I need to make to my program...
"You will create a set of either collections or arrays (your choice but use just one or the other--don't mix them) scoped at the form/module level. These structures will store all of the input data needed for your checkbook transactions except for the running balance which will continue to be stored in a single module-scoped variable. That is, every input that users made in Assignment 3 will be stored in one of these arrays but you will not store any calculated values. You will not store the transaction type but will store "Dep" or a number in the check number array which will also indicate the transaction type. The Record button will add the current sale's data to these structures using either ReDim for the arrays or an appropriate technique for the collections. (You must ReDim your arrays so that the have just enough space for the data that is in them. Declaring the arrays with a large size with no facility to resize them is not allowed. Don't forget to use the ReDim Preserve syntax to retain the existing array contents when you resize them.)"
I don't know if I make a single array for all the values or if I create a separate one for each. If its a separate one for each I don't understand why an array is needed.
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Apr 16, 2012
Ok, as you can see I am totaly new with Visual Basic. I have learned all those loops, if&else statements, byval, byref and etc. But now, I want to create this kind of application. I have 3 textboxes. One will contain URL, second username, and last password. There is a listbox also and a button. I want when user add a values inside textboxes , that values go to listbox as one variable and then save those settings for user so when he start up application again there are saved variables inside listbox. I just dont know how to do that.
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Nov 28, 2010
I'm working with a website written in aspx.net over vb. I have a placeHolder, and I create a table of names inside this PlaceHolder, each name has an HtmlInputCheckBox next to it. Im doing this in the aspx.vb file, when the page is uploading. Then, when the user wants to send mail, he presses a button and than I need to access the checkboxes, and I'm having problems with this, the Sub doesn't know the checkBox object.
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Nov 7, 2011
I've created a function in my vb class file that creates dynamic tables. I'm planning to use this to create tables dependent on a button being clicked. The function references a placeholder in my aspx page but I'm getting "placeHolder1 is not declared".How can I access controls on my form from my class file? [code]
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Dec 1, 2011
I need to remove the "padding" or "image place holder" before the text on a ToolBarButton (not a ToolStripButton). There is not ImageList set for the ToolBar, but there is still a blank space before the text on the left hand side of the ToolBarButton.
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Apr 22, 2010
I have a created a user control. This user control I dynamically load on a page inside Telerik Panelbar control. I have done all necessary coding to save the viewstate and load this dynamically created usercontrol every time page loads.On this User control I have a asp panel. By default this panel is invisible. When user clicks a button on this user control panel is made visible. On page load of this user control I populate all the controls on this panel.Everything works fine if I dont load this use control dynamically but when I load this user control dynamically and if I make panel visible by default then only all fields on the panel are populated. But if I make by default invisible and on button click make panel visible none of the text boxes or comboboxes are populated. I populate comboboxes on page load of the userControl but inbetween postbacks all the comboboxes on the user control loose data.[code]...
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Nov 13, 2009
The problem is this: I have two forms. One form and the other form do mathematical calculations. I want to save the values that the user inputs, so when the user quits the program and then starts it up again the values are still there. But when I open up the program, start typing in values, then calculate them, hit quit. Try to open up the program again, its giving me a message that the input file is invalid. When I click ok, the program doesn't crash, continues. But the values are not there at all. The other form I put exactly the same code, just changed the variables and it doesn't want to save the values at all! I wrote this code for saving and loading the values:
[Code]...
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Apr 4, 2011
I've done asp.net exclusively so long, and now I have to convert a small web app to a desktop app.
At one point in the web app, I dynamically generate a table of data and add it to a placeholder control.
I'm not sure how that would be done on a desktop app. Can anyone suggest a control or 'windows' way of doing that.
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Feb 7, 2012
I have a UserControl that has a simple repeater inside. It has a property called data which when passed into the control populates the repeater using the standard databinding.
On a page I have a placeholder.
I have a loop which does the following
Dim qDetail As New UserControls_ReportDataTable
qDetail = DirectCast(LoadControl("~/UserControls/ReportDataTable.ascx"), UserControls_ReportDataTable)
[Code].....
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Feb 13, 2010
When I add my user control to a flowlayoutpanel its going left to right even though the flowdirection is set to TopDown
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