Web Forms :: Dynamically Generated DropDownLists?
Jun 30, 2010
I have a dropdownlist on my page which has autopostback set to true. On postback I populate a runat server div with a bunch of other DropDownLists. I then have a button which does another postback to save the selections. Because the second set of dropdownlists are dynamically generated I cannot for the life of me figure out how to get their selected values?
1st DropDownList
[Code]....
Then when I try get the dropdownlists using a foreach on the div that I added the control to it does not work. They are populating fine, its just on the button click. I have tried EnableViewState = true on the dropdownlists and my code is correct because if I code them into the aspx then it works, its something to do with the state.
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Sep 28, 2010
A short background about this project: I'm creating an image gallery where images are uploaded and sorted into a category and then a subcategory, eg. "Vehicles" and "Cars". Every subcategory has a variety of tags to further categorize the picture, eg. color and make in the cars subcategory.
These tags (named "Criterias") are listed as DropDownLists through the following piece of code:
[Code]....
My problem now is that I can't figure out how to loop through them to find what criteria values to tag the image with.
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Jan 30, 2011
i have the following code:
[Code]....
3 nested dropdownlists SELECTing from DB. So i select the brand, then i select the model and then i select the product and click on SEARCH button.
But when i select thebrand, and then the model, and if i want to change the brand, it does not reset the second and third dropdownlists.
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Dec 20, 2012
I have it setup so that when a user selects an item from a DropdownList, that some DropdownLists are dynamically created, based on the results from the Database that are returned after selecting the item in the first DropDownList.
Then, I have a button that takes the data and saves it to an object I've created for this, and I try to iterate through the Controls of the Placeholder that I added the DropdownList controls to.
However, the Placeholder says there are no controls in it, when I press the button, but I can obviously see them there.
Here is some code:
When a "Pilot" is selected, I get all of the Upgrade Types that that "Pilot" has access to, then I create a DropdownList for each type of Upgrade with all the actual Upgrades of that Type:
VB Code:
For Each u As UpgradeTypeList In upgrades     Â
Dim lbl As New Label     Â
Dim ddl As New DropDownList      Â
ddl.AutoPostBack = False      Â
[Code] ....
Then, when the "Add Squad Member" button is pressed, I am trying to iterate through the controls, pick out any DropdownLists and get the values from them and add them to a List Of in an object for the Pilot info:
VB Code:
Protected Sub btnAddSquadMember_Click(sender As Object, e As EventArgs) Handles btnAddSquadMember.Click Â
For Each c As Control In rowUpgrades.Controls     Â
If TypeOf c Is DropDownList Then       Â
Dim DoesExist As Boolean = False        Â
[Code] ....
But, the controls supposedly don't exist and no values get added to the List(Of).
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Jul 9, 2010
I'm displaying a table based on query results, and each record has a dynamically generated dropdownlist and submit button (and other controls, but this is simplified). That part works fine, but how do I reference the controls in a function? Here is the code I've tried. Create the controls:
[Code]....
Reference the control values (hopefully):
[Code]....
The function SubmitAction_Click fires when I click the Post button, so that part works. I just can't figure out how to reference the selected value of the dropdownlist. You can see that I'm explicitly giving the DDL a unique ID (DS_RecordID). I'm guessing I have to use FindControl to reference it, but I don't know how to format the code.
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Feb 11, 2010
I have implemented a user control with dropdown lists and textboxes where user may choose to add more of the same user control dynamically then submit the values within all usercontrols at the same time. They way I added usercontrols dynamically is whenever user clicks "add more" button, it increases the value of "userControlAmount" in session by 1, reloads the page and during next page_load event, within an updatepanel it creates usercontrols on the fly.
However whenever more is added since all usercontrols are generated again according to the latest user control counter, the values within the dropdownlists and textboxes are getting reseted.
I can hold all values in a viewstate/session however beyond the time/effort it will take, it doesn't sounds very "professional" to me. I was wondering if there is a more efficient way of doing this.
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May 27, 2010
I have a form that has dynamically generated textboxes using javascript.
My question is how can I read the values of these dynamically generated textboxes since I dont see any HTML in the page source for these textboxes even though they appear in the page.
I tried to read using
var str = document.getElementById('txtHello').value;
It always returns null.
txtHello is the Id which I have given to the textbox when I generated it dynamically using javascript.
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May 21, 2010
I am generating a button dynamically at runtime and in event button click I am generating a TextBox dynamically at the runtime.
My question is I should be able to generate TextBox on every click. Suppose say, If I click three times then there should be three textboxes generated.
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Jul 20, 2010
I've to implement dynamically generated 'Tests'. It seems the best asp control to handle each's test option is the RadioButtomList control, thus I am writting in c# code to load programatically a table, render on rows the Tests' questions, and the options via radiobtuttonlist as the code bellow shows.
THE PROBLEM's since I did not ID each radiobuttomlist, once the test's end user submit his choices, I do not know how to get the selected item for each control so I can compute the results.
[Code].....
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Feb 23, 2010
I've recently added a Master Page to my site,but realized that it's caused some problems in my existing JavaScript setup.I am able to use the following code in most places without any issue to get the ClientID: '<%=myControl.ClientID%>'
The problem I have encountere is that I have several pages that add controls dynamically,and then execute events based on an ID that's passed in,where I can't use this line,because I won't know the ID of the control I'm trying to access until the Javascript executes.Here's a simplified version of the problem:
When the page runs,it creates n textboxes dynamically,and appends a relevant ID from the database to the end of the ID.Let's say the page has added 3 textboxes with the following IDs:
myTextBox1
myTextBox7
myTextBox115
Later,a javascript event fires,and I need to be able to access the control through JavaScript like this:
myJavaScriptFunction (controlID)
{
myvar = document.getElementById('myTextBox' + controlID);
}
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Mar 18, 2010
I'm trying to get dynamically generated control by id with FindControl function, but it doesn't return it
here's short version of code when I generate controls, it is basically in a loop to have number of CheckBoxes depending on inputs
[Code]....
[Code]....
[Code]....
[Code]....
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Jan 17, 2010
how to Work with Dunamically generated Link buttons..
I need to find the unic name of each dynamially generated linkbutton..]
Is there any way to work with that..
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May 6, 2010
I have a asp.net page where we need to dynamically generate a table, table row, and a checkbox controls in this row. A button serves Add Row and create checkbox function, which works fine. We have another button which serves on deleting the selected row if a user checks the checkbox. The deleting event is dynamically added to the checkbox. But the delete button is not working at all. I think that the page does not maintain the states of dynamically generated controls, even I set Page enable view state to True. Here is the code:
I am generating a table dynamically with one row having four cells.
First cell is having checkbox and below is the code how i declare it and assign it a new id at runtime.
[Code]....
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Feb 23, 2011
i'm trying to bind the dynamically generated table content to div using
[Code]....
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Jun 2, 2010
I have a dynamically-generated textbox and a static text box. They both have enableViewState = false. On the web page, I enter "ABC" in both textboxes. In the code-behind I set both text boxes to "EFG" in the page_load event.
In debug in page_load I can see both textboxes say "EFG". This is what I want.
When I hit the LoadComplete event, the STATIC textbox still has "EFG", but the dynamically generated textbox has gone back to "ABC".
I went one-by-one through all properties on the dynamically generated/static textbox, and they are all identical.
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Sep 5, 2010
I have a situation here.
review the following code
[Code]....
Now when user clicks on the accept or reject button, there is an error (could not parse server message) however if there is only one instance of both buttons the code works fine.
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Nov 8, 2010
I create textboxes in codebehind based on user choice from a dropdown. The user then fills in thevalues of those textboxes and clicks a linkbutton to save the values. When I try to access those textbox values, they are null.
aspx code: <asp:PlaceHolder runat="server" id="TextBoxesHere" />
VB Code:
Private Sub CreateTextBoxes()
Dim ct As Integer = ddlAYIntervals.SelectedValue
TextBoxesHere.Controls.Add(New LiteralControl("<br><table id=""NewIntervals""><tr><th>Interval Name</th><th>Start Date</th><th>End Date</th></tr>"))
' now, create n TextBoxes, adding them to the PlaceHolder TextBoxesHere.........
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Jan 13, 2010
i am working on a website,As i am new to coding i got a problem in it. It was, i hav dynamically generated link buttons in my page, If i click on the any link button i should get the text of the link button, how to get it ?
LinkButton lnkbtn = new LinkButton();
lnkbtn.Text = dt.Rows[i]["vcSchoolName"].ToString() + ("<br><br>");
lnkbtn.CommandName = "ghg" + i;
[code]...
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Jan 8, 2013
i've dynamically created new rows on button click in gridview with 3  dropdownlist.for the first default row the selectindexchanged is firing and on pageload 1st ddl is loading with values and basing on selection the second ddl is showing values and third ddl is showing basing on second ddl. Now, when i click add new row, a new row is created with 3 ddl's ...1st one is showing properly but when i select from that ddl ,it should show data accordingly but its not showing particular data but showing all realted  data from DB.same for 3rd ddl.
Also when new row is added and the first ddl is selected on postback the second ddl data is refreshing..
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Sep 21, 2010
I have the following Menu:
[Code]....
[Code]....
It's being loaded from a dynamically generated XmlDataSource Item:
[Code]....
The XML of which looks something like this:
[Code]....
I can't seem to figure out a way to make the width of the drop menus consistent (they're following the padding conventions I have outlined, I get that). What I'm interested in is a way to make the DynamicItemsStyle width on all items the width of the widest one.
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Feb 28, 2011
I am learning .net and I have implemented SiteMapPath on a site i'm developing which uses Url Routing. It is working fine for static routes but i am trying to get it to work on a dynamically generated route that passes a {date} and a {title} but I can't find any information on it anywhere, I have a book but it doesn't go in to SiteMapPath with UrlRouting.
I have set up routes in Global.asax file:
[Code]....
My web.sitemap currently looks like:
[Code]....
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Jan 27, 2011
I am generating Dropdownlists to each row that I get of a database table and then bind them to an asp table.
I am doing the paging of the asp table myself. I'm just adding the rows regarding to the page.
Example: Page 2 (10 rows) => Rows 11 -20
The problem is, when I click a next button to get to the next page. The selectedindex of dropdownlists on the next page are getting overwritten.
I am loading the table in the page_load.
Here is some code of page_load[Code]....
And this is my load_table:
[Code]....
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Jun 15, 2010
I have created a page with a textbox and a button, when you enter a number in textbox and click on button, the onCommand event generates dynamic textboxes with dynamic requiredFieldValidators in the placeHolder and a newbutton. Now when I click on newButton, it does not validated dynamically generated textboxes, it does postback and every dynamic object disappear. The sample code is provided below.
[Code]....
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Mar 22, 2011
I have a grid and on each row of grid i generate a radiobuttonlist with 2 items dynamically in rowdatabound. On the save button event i want to access the data of the row and save the data in DB with which ever radio button is selected.I tried different things but all in vain. I tried to use hidden field so that whenever any radio button is selected in a row then in javascript i will update the hidden field but user can select multiple rows so this is not a good solution.
Here is my code of dynamic radio button list generation in rowdatabound event.
[Code]....
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Feb 5, 2011
(The following is a complete re-edit of the original post which was rambling, confusing etc...)
I have a form with a dynamically generated checklist:
<asp:CheckBoxList ID="cblGames" runat="server" DataSourceID="sqlGames" DataTextField="Game" DataValueField="Id" </asp:CheckBoxList>
<asp:SqlDataSource ID="sqlGames" runat="server" ConnectionString="<%$ ConnectionStrings:Games %>"
SelectCommand="SELECT [Id], [Game], [ShowWaitingList] FROM [Aanbod] WHERE ([ShowWaitingList] = @ShowWaitingList)">
<SelectParameters><asp:Parameter DefaultValue="true" Name="ShowWaitingList" Type="Boolean" /></SelectParameters>
</asp:SqlDataSource>
The following code-behind is supposed to check those boxes that correspond to values stored in a database. It fails and I don't know why.
[Code]....
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