Dynamic Creation Of ASP.NET Form Elements?
Nov 20, 2009
I'm trying to build a form which generates itself as it is used. I have created a really simplistic example, loosely related to what I'm trying to do below, but which demonstrates the problem.The user types a word in the text box, clicks the Button and a new TextBox is loaded into a Panel, with the value in the original TextBox that the user has entered. The user should then be able to type something else/the same and create another text box with that in it by clicking the button, basically permitting 0,1,..,n textboxes appearing above the "txtFeeder" TextBox on the form.The problem is that everytime you click the button, it doesn't add a new control, it seems to just update the one that has already been created with the new (incremental) ID. I'm not sure if I'm doing something wrong, or if what I'm trying to do can't be done (which I find hard to believe)?Here's the .aspx...
<form id="frmMain" runat="server">
<asp:Panel ID="pnlAdded" runat="server"></asp:Panel>
<asp:TextBox ID="txtFeeder" runat="server"></asp:TextBox>[code].....
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Aug 12, 2011
I need some input refactoring an asp.net (c#) application that is basically a framework for creating dynamic forms (any forms). From a high level point of view, there is a table that has the forms, and then there is a table that has all the form fields, where it is one to many between the two. There is a validation table, where each field can have multiple types of validation, and it is a one to many from the form fields table to the validation table.
So the issue is that this application has been sold as the be-all-end-all customizable solution to all the clients. So, the idea is whatever form they want, we can build it jsut using DB configurations. The thing is, that is not always possible, because there is complex relationship between the fields, and complex relationship between the forms themselves. Also, there is only once codebase, and this is for multiple clients - all of whom host it on their own. There is very specific logic for each of the clients, and they are ALL in the same codebase, with no real separation. Sometimes it was too difficult to make it generic, so there are instances where it has hard coded logic (as in if formID = XXX then do _). You can also have nested forms, as in, one set of fields on its own within each form.
So usually, when one client requests a change, we make the change and deploy it to that client - but then another client requests a different change, and we make the change and deploy it for THAT client, but the change from the earlier client breaks it, and its a headache trying to debug, because EVERYTHING is dynamic. There is no way we can rollback the earlier change, because then the other client would be screwed.
Its not done in a real 3-tier architecture - its a web site with references to a DB class, and a class library. There is business logic in the web site itself, in the class library, and the database stored procs (Validation is done in the stored procs).
I think this is a bad model in general, because one of the things I heard one of the developers say is that anytime any client makes a change, we should deploy to everybody - but that is not realistic, if we have say 20 clients - there will need to be regression testing on EVERYTHING, since we don't know the impact...There are about 100 forms in total, and their is some similarity in them (not much). But I think the idea that a dynamic engine can solve ALL form requests was not realistic as well. Clients come up with the most weird requests. For example, they have this engine doing a regular data entry form AND a search form.
There is a lot of preserving state between pages, and it is all done using session variables, which is ok, except that it is not really tracked, and so sessions from the same user keep getting overwritten, and I think sessions should be got rid of.Should I really just rewrite the whole thing? This app is about 3 years old, and there has been lots of testing and things done, and serious business logic implemented, so I hate to get rid of all that (joel's advice). But its really a mess of a sphagetti code, and everything takes forever to do, and things break all the time because of minor changes.
I've been reading Martin Fowlers "Refactoring" and Michael Feathers "working effectively with legacy code" - and they are good, but I feel they were written for an application that was 'slightly' better architected, where it is still a 3-tiered architecture, and there is 'some' resemblance of logic..
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Mar 7, 2011
I have a form that requires 5 columns of textboxes that the user will populate. By design I will provide the first row but, the user will need the ability to add or delete subsequent rows. Is there an easy way to approach this requirement?
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Feb 15, 2012
I have a reguirement to enable the creation of excel workbooks from sql stored procedure. To do this I want to create a vb class to generate and save the excel files. Then and ASP.net page will enable opening the excel file via the browser or enable the user to download the file.The class should be able to be called from a vareity of pages within the web app and have the ability to handle 8 to 10 separate stored procedures that will return various data sets.
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Dec 16, 2010
How can i add columns to rdlc report at runtime in windows based application using vb.net
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Jul 9, 2009
I am trying to get the hang of Dynamic loading of objects from assemblies on the same machine (But NOT part of the same project).In the sample below, Form1 implements an interface built as part of the .dll I placed in C:Release. I am trying to create a local instance of Form1, and Cast it as Iform, so that the local code can access the properties and methods exposed by the interface.The assumption here is that at runtime, local code will have access to the String name of a form, and an interface which is implemented by the form (and is compiled into the .dll as well as the client application), and that is it.
When I run this code, I get a exception: "Unable to cast object of type 'WindowsApplication1.Form1' to type 'WindowsApplication1.Iform'.
Public Function fApplicationObject() As Iform
Dim sLocation As String = "C:ReleaseWindowsApplication1.dll"
Dim sType As String = "WindowsApplication1.Form1"
[code]....
I seem unable to dynamically load an object from a dll and then utilize an interface to access it's properties and such.
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Jan 22, 2012
I am trying to make a program that will include a drag/drop view where you can arrange objects around in a view and add/delete objects as needed (objects are actually controls I create dynamically), I have made some code which I include below.If I run this code it works but not the part when I click on a newly created control, then mousemove function is not used, I should be able to move controls using the mouse functions..but these do not work. I thought code like:
AddHandler logicif(i).MouseMove, AddressOf logicif_MouseMove
should work! Can anyone give me pointers on what I am missing?
Public Class Form1
Dim logicif(20) As Panel
Dim count = 0
[code]....
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Oct 27, 2010
Every time i enter set of values like Group Name,Group Abbreviation,URL in the text boxes and click the save button automatically its saves in the database and for each set of values a new details view has to be generated dynamically with a web panel and the header of the web panel should have the value of Group Name.
Example:
[Code].....
A new details view with web panel like the above has to be generated every time the save button is clicked.
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Oct 19, 2010
Can i create a table with the input taken from user at runtime from vb.net.?
From vb.net in sqlserver 2008
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Apr 7, 2011
I'm currently working on a program where I'm trying to dynamically create a picture box, a button, and a label for each item in a text file. Any ideas on how to do this? What I have: a plain text file with a list of numbers. Each number corresponds to a location. When that file is read, I want to create a picture box, a button, and a label related to each number. If I want to add something to the screen, all I Have to do is add a number to the file. So, lets say the file has. 1, 2
When the file loads, it will create a unique item on the display for each location. say pic1, button1, and label1 and pic2, button2, and label2. Right now, if I add something to the file, I have to go back into the editor and manually add everything. Which is a pain.
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Jul 12, 2009
I have started a new blank project for VB 2007. I have taken the old code (VB 2003) and added it to the project.The line marked below worked on the old VB, now it does not. I get the following error:
Object reference not set to an instance of an object.
Troubleshooting tips:
Use the "new" keyword to create an object instance.
Check to determine if the object is null before calling the method.I have tried several forms of using the "New" keyword and still get the error.
Public Sub BuildChooseFileMenuItems()
Dim k As Integer
Dim numChecked As Integer
[code].....
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Apr 20, 2012
i need to create sql tables based on user needs lets say a guy needs a table of 4 rows 5 columns other user needs 3 rows 3 columns each with different types so how is the best way for letting them choose like they write in a text box ( this will be the value of rows)4 and another text bvox the count of columns and i have those 2( rows and columns needed) numbers i create the table as is.based on those. by default i create type as varchar max then later on we must fill the table using datagrid.
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Sep 4, 2010
I am new in programming. And I am coding with VB.Net (VB2008). On my form I have 9 checkboxes. And each of this checkbox when checked is meant to submit a value to a dynamic array. Initially the array was a constant that was declared like these:
Dim Notes() AS integer = {1, 2, 5, 10, 20, 50, 100, 200, 500, 1000}
But I want the array to be dynamic. That is the user of the program is to enter the element of the array. So I decided to use checkboxes. So that if the user of the program checks any of the checkboxes, a particular value or element should be submitted into the array. And the user should be able to check as many checkboxes and have values representing those checkboxes submitted in to the array.
For example: if the user check checkbox1, checkbox2 and checkbox50.
The array should look like these. { 1, 2, 50 }
or if the user check checkbox1000, checkbox200, checkbox10 and checkbox500
Then the array should hold or contain the following integers in this order; {20, 200, 500, 1000}.
That is the array is dynamic and the content/elements of the array and the bound of the array should depend on the checkboxes that is checked. What other means can I used to enter values/elements into a dynamic array during run time.
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Jan 30, 2011
I have a method which I need to call which accepts a ParamArray
Method(ByVal ParamArray elements() As Object)
I need to pass it two known strings, and an unknown number of strings, based on a variable number of XmlNodes in an XmlDocument[code]...
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Feb 19, 2010
Ive managed to dynamically create a form, and dynamically create a timer, but i have not been able to create the timer on the dynamic form. Specifically, i need to be able to have the timer itself create another form with a timer. (I realize that this would create a new form every interval on the timer, that is what i want to do)
1. A way to add the timer to the dynamic form, and maintain the timer sub on my main form.
2. A way to create the whole thing over (dynamic form and timer) through the previous dynamic form and timer.
I was thinking i could use a collection/array to store the forms and timers, but i'm still having trouble figuring out how to add entire forms or timers into a list. (A timer is not considered a control, so i cant use a controlcollection...)
Heres my code;
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim frm As New Form
[Code]....
*EDIT* Btw, my idea was to use i as a variable that increases every time a form is created, then insert the form into the array, with i as the integer. i just need to know how to create a new form with a different name each time. (as with timers)
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Jul 25, 2009
ok so heres what im trying to do. I have one form with a textbox and a button. im trying to make it so that when you type in the word "internet" a new form will be created and it will have the following components inserted onto it;
one webbrowser
one textbox
eight buttons
im not really having a problem making a new form so much as having a problem putting the tools on it, heres what i have
Dim screensaver As New Form
Dim back As New Button
Dim forward As New Button
[Code].....
vb doesnt say i have an error or anything like that, but i cant create "internet". i can create the form but cant put any of the components on it.
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Oct 15, 2009
I have a form that i need to be 100% Dynamic. So it could contain 10 labels maybe 100 who knows.
When you hover over a label there will be a different contextmenustrip to appear for each and every label. So all the contextmenustrips are Dynamic and contain 1 option maybe 2 options even 3 or 4 up to the users settings.
My problem is not creating a handler for when the user clicks on the contextmenustrips options. The problem is knowing which one of the options for that contextmenu was clicked!!
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Nov 20, 2011
I have an assignment I need to make and I have to make an app where the user can create a map/floorplan.So basically they open up the program go to create or edit and they should get a blank or already made floor plan.After that they should be able to add new icons/components to the floorplan or change them location wise on the floor plan.I have been searching into custom user controls and a few post I found on the internet about dynamically creating buttons.The dynamically creating buttons could do if the users can modify their locations and if it could save the whole form after being altered.However I want to be pointed in the right directions and know if any of these will work before I start doing more research and going more in depth.
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Nov 24, 2011
I am just wondering how to force the creation of a handle of a control before the form that it is contained on is loaded... I have tried:
[Code]...
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Sep 17, 2010
I created a method and pass the element type, id, and any inner text that instantiates a new html element. The last statement: Me.Controls.Add(element) adds it to the end of the page, but I would like it to be inserted in a specific position (between 2 divs within a form). What I am describing is very similar to this post on SO here, although it was for javascript.
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Nov 28, 2009
I'm facing to 1 problem here. I need to count the Panel elements on the current form and put them into array, but i dont have any idead where to start.
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May 27, 2009
I have an XML form, and I want to read in the values in each of the elements of that form. I have a bit of code to start me off, but it doesnt just read the data in the xml tags, it reads the xml tags as blanks. I need to know how to get around that, so that the program displays the data only.[code]....
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Jan 1, 2010
I am using VB 2008. I have made a web browser but according to computers' display settings it does not fit.Its size is 1024 x 768 so it does not fit when computer settings are 1280 x 720 or etc. So i wonder if there is any way to solve this problem.BUT NOT JUST FOR FORM1 BUT FOR ITS ELEMENTS TOO( webbrowser1, options and etc)
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Jun 24, 2011
i have this code to extract all form input element in html document. currently, i cant get select, textarea and other elements except input element.
Dim htmldoc As HtmlDocument = New HtmlDocument()
htmldoc.LoadHtml(txtHtml.Text)
Dim root As HtmlNode = htmldoc.DocumentNode
[Code]....
how to get all elements in all forms in the html document?
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Jan 31, 2012
I have a form that I need to show "nonmodal" while I do some work, the form displays a label that outputs strings captured from a cmd window. So I am doing it like this
Dim f As New AutoRDP()
f.Show()
f.doit()
f.Close()
Private Sub lockprompt_Load(ByVal sender As System.Object,
[Code] ......
The problem I have is I can load the form correctly.. all the elements loads up blank. But if I use showdialogue() it loads correctly, but I cant return to do my work..
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May 14, 2011
I have a form that has a queue and I want to transfer the data of that queue to another queue in another form. however when i try to use the elements in the second queue after transfer, I get the error message queue empty!
Below is my code
First form
Imports System.Collections.Generic
Public Class Form1
Dim wait As New Queue(Of String)
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[Code] .....
I expected the recieveQueue function to copy the queue passed to it into the waiting queue, then it allows me to use the waiting queue contents as I want. But when I try to use it, around this line I get the error, 'queue empty' < If waiting.Count > 0 And waiting.Peek <> "" Then >
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Aug 26, 2010
I am trying to rewrite an ap I wrote in Vb6 to VBNet 2008. Part of requires signing in to a website automatically. [Code] Can some tell me what data type I need for the form elements? I have tried HTMLELEMNT but that doesn't let me change the value or click.
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Apr 20, 2011
I'm creating a simple programming assignment in Visual Basic 2010.(Don't know if it matters, but I'm working in MS Visual Studio.The program consists of two windows forms and a module.Everything works fine except for this one loop I'm trying to use to display whether the answers were "correct" or "incorrect".[code]
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Jul 18, 2011
I have the following "contact" data (exampled below) stored in an xml file.I've created a frmContacts windows form and placed a list box control inside it.I'm new to the list box but plan to have the users manage the list by letting them add, delete, and pick from it. For searching there should also be a sort function/button (by last name then first name).If the user deletes from the list the corresponding data in the file will be deleted.If the user picks from or adds to the list, I'd like to find the best way to populate the corresponding data elements on another form (i.e., in their respective text boxes). This will include the ability to edit/save from this other form too.
<?xml version="1.0" encoding="utf-8"?>
<Rows>
<Row>[code]......
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Sep 4, 2009
I have a standard windows application called winap. I have a com component which acts as an api to the winap. I have a class in winap call classapi which has all the methods that the api calls and all works well. The problem is that one of the methods in my class api needs to get a handle on form elements in the main worker thread. Whenever I try to access an existing form I keep getting null because the for exists in the main worker thread and my api call is in a seperate thread.
[Code]...
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