C# - Dynamically Update Attributes Of ASP Controls Dynamically?
Sep 2, 2010
In my aspx page, I have a number of drop down controls. I would like to update an attribute on each of the controls with "class=leftColumn" with the following line: propertyID.Attributes["nameOfAttribute"] = "false";
But instead of manually writing out each controlID and setting its attribute with the line above, I had hoped there was a way to go through and set the attribute on each control ID if it had class=leftcolumn. This is something I know is very easy with JQuery, BUT I need to do it with the code behind (C#) I was told this is not possible (i.e. to acquire a list of all the controls and then iterate through the list and give it the attribute or any other way. That manually setting each control like the above example is the only way in ASP.NET.
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Aug 10, 2010
I am using the following XML structure
<SERVERS>
<SERVER NAME="A1" ID="1"></SERVER>
<SERVER NAME="A2"></SERVER>
<SERVER NAME="A3" ID="3" Parent="XYZ"></SERVER>
<SERVER NAME="A4" ID="4"></SERVER>
<SERVER NAME="A5" Parent="abc" value="10"></SERVER>
<SERVER NAME="A6"></SERVER>
</SERVERS>
I am accessing this xml file by using LINQ to XML in asp.net by using C#. I am able to access all the attributes of an XML node by explicitly specifying the name of the attribute. I want to write query on this xml file which reads all the attribute values of the xml node (In our example the node is SERVER) dynamically means I want to write the query which can read the read the value of the attribute Name & ID from first node, only name from second row, Name, ID & Parent from the third row , Name & ID from the fourth row, Name, Parent & Value from the fifth row & only Name from the sixth row without modifying the existing code every time. Once I add one of the attribute ( for example if I add the attribute ID in the sixth row ) in the above xml file then I dont need to modify my LINQ to XML query. My query should dynamically fetch the total number of attributes & display their values. Is their any way to do this ?
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Mar 1, 2011
have some code which dynamically generates a number of drop down lists to provide the user with different options. The items in these drop downlists contain a value which is a unique id for that particular combination of options and a text component which just plain text but not neccessarily unique. I then have assigned a handler to these dropdownlists which is called on selected index changed to perform the relevant actions based on what options are selected. The problem is to make the system perform the correct action I need the unique ID from selectedValue of the drop down box but when it posts back it appears the selectedValue has been replaced to match the text of the item.
Dim dynDdl = New DropDownList()
dynDdl.ID = "ddlOpts" & i
dynDdl.AutoPostBack = True
AddHandler dynDdl.SelectedIndexChanged, AddressOf dynDdl_selectedIndexChanged
[code]...
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Nov 24, 2010
I have been trying to add validation attributes dynamically at runtime and all works ok. I next tried to add a DisplayAttribute at runtime hooking into the same
[Code]....
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Mar 18, 2010
Im trying to create a "user control menu" where links to a page's usercontrols are placed at the top of the page. This will allow me to put several usercontrols on a page and allow the user to jump to that section of the page without scrolling so much. In order to do this, I put each usercontrol in a folder (usercontrols) and gave each control a Description property (<%@ Control Language="C#" Description = "Vehicles" .... %>).
My question is how can I access this description dynamically? I want to use this description as the link in my menu. So far, I have a foreach on my page that looks in the ControlCollection for a control that is of the ASP.usercontrols type. If it is I would assume that I could access its attributes and grab that description property. How can I do this? (Im also open to a better way to achieve my "user control menu", but maybe thats another question.) Should I use ((System.Web.UI.UserControl)mydynamiccontrol).Attributes.Keys?
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Feb 5, 2010
I have a menu generated by my cms:
<ul>
<li><a href='default.aspx?pageid=2' id='link2'>rrr</a></li>
<div runat='server' id='menu2'>
<a href='default.aspx?subpageid=8'>rrr</a>
<a href='default.aspx?subpageid=9&siteid='>rrr</a>
<a href='default.aspx?subpageid=10&siteid='>rrr</a>
<a href='default.aspx?subpageid=11&siteid='>rrr</a>
</div>
<li><a href='default.aspx?pageid=3' id='link3'>Your Services</a></li>
<li><a href='default.aspx?pageid=4' id='link4'>rrrrrr</a></li>
<div runat='server' id='menu4'><a href='default.aspx?subpageid=1'>Single Equality Scheme</a>
<a href='default.aspx?subpageid=2&siteid='>Diversity Strands</a>
<a href='default.aspx?subpageid=3&siteid='>Equality Impact Assessments</a>
<a href='default.aspx?subpageid=4&siteid='>Quality and Safety Committee</a>
</div>
<li><a href='default.aspx?pageid=9' id='link9'>Contact Us</a></li>
</ul>
I would like to change the link that has been clicked, to class="active". I would like to add a class to the div if the page above is clicked too.
If (Len(Request.QueryString("pageid")) <> 0 and Request.QueryString("pageid") = 4) Then
menu & Request.QueryString("pageid") & .Attributes.Add("class", "active")
link & Request.QueryString("pageid") & .Attributes.Add("class", "activelink")
end if
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Sep 28, 2010
I'm creating an quiz application which queries the database and extracts the questions and choices. I use dynamically created controls such as a checkbox list and fill the values dynamically. How do I do this? Right now I have these functions:
array_random_init(); this creates a 10 element integer array from 1-20 - extract_question(i): this extracts a question indexed at i in DB, I created the controls and set the appropriate text in this function. - validate_question(i); this is called by button_click and validates the question i according to DB.
I understand I have to recreate the controls in Page_init on postback, but what should it look like? Do I need to add "if IsPostBack" in page_init, or do I create the controls in page_init() and reset their properties in page_load when I use extract_question(i)? Also, I cannot seem to clear the selected boxes on postback, I added page directive "enableviewstate=false" but it doesn't work.
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Mar 10, 2011
I've already spent hours in searching through the forum to be able to do the following:I have a SQL datasource defined with a checkbox in it. Purpose is to update one column (userid) behind the table for only that row when the checkbox is selected.This is the code I'm currently having:
[Code]....
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May 2, 2014
A simple poll system that loads questions and possible answers.
I load questions, so that each one is generated as a DIV element and placed inside a DIV element already present in HTML markup.
Next, for each question I load answers, generate them as LinkButtons and add them to the corresponding DIV controls collection.
This all works as expected, the questions and answers are all nicely generated.
Now, all the dynamically created controls are placed in a DIV element that is inside an Update Panel.
HTML MARKUP:
HTML Code:
<asp:UpdatePanel ID ="infoUpdate" runat ="server" >
<ContentTemplate >
<div id ="info" runat ="server" >
<asp:Label ID ="infoLabel" runat ="server" ></asp:Label>
[Code] ....
The problem is, that I can't seem to register the dynamically created controls with the UpdatePanel, so when I click a LinkButton it doesn't do a Full PostBack.
Below is the sub I use to generate the controls:
vb.net Code:
Private Sub createPoll() Try
connection = New SqlConnection(connectionString)
connection.Open() ''Get the currently active poll ID
Dim sqlQuery As String = "SELECT pollID FROM polls WHERE pollStatusID = 1"
Dim myCommand As New SqlCommand(sqlQuery, connection)
[Code] ....
As you can see, I tried adding a handler to each control and then adding the control to the UpdatePanel ContentTemplateContainer, but the clickEvent never gets fired.
I also tried adding triggers for each controls, but it made no difference.
I am quite sure this has to do something with the Page LifeCycle, but I just can't see it.
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Mar 10, 2010
I want to Update Column of a Table where ColumnName will be DropDown.SelectedValue. Example: A set of RECORDS will be displayed from a Customer Table where CUstNo ='1234' and City= 'Chicago' and Grade ='B' Once displayed I want to Update the grade to 'A' of all those customers from the above criteria. In My case I have like 100 Columns, so in where Clause Column Names will be selected from a DropDown. In My Query, Update Customer SET ColumnName= 'some value' where ColumnName ='ActualValue' So how can I pass the ColumnName which is Dropdown Selected Value. I believe I can't give as Update Customer SET DropDown.SelectedValue = 'some value' where DropDown.SelectedValue ='ActualValue' how can I resolve this ?...
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Nov 28, 2010
I'm dynamically loading a user control with a form view inside, when I'm trying to update the form view the user control disappears on the post back and update never happens;
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Jan 11, 2011
I am creating a survey page that has a list of questions and answers that can be radiobuttonlists, checkboxlists or textboxes. These controls are added dynamically to a Repeater in its ItemDataBound event using Controls.Add.
I've managed to render the page ok but when I submit the form and iterate over the controls in the repeater to get the selectedvalues of the radiobuttons and textbox values, FindControl returns null. What do I need to do to get get the selected values? I've tried iterating over the RepeaterItems but that returned null too. I've tried different types of FindControl but it never resolves the control types.
It works if I add a declarative DataBinder in the Repeater like this
<asp:Repeater ID="rptSurvey" runat="server" Visible="true" EnableViewState="true" >
<ItemTemplate>
<%# DataBinder.Eval(Container.DataItem, "Question") %>
</ItemTemplate>
</asp:Repeater>
However, I want want to dynamically add the controls but in doing this i cant get the selectedvalues when submitting. This is tha main structure of my code...
[code]....
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May 7, 2015
I am binding repeater control for mega menu, its working fine but i want to repeater do not load every time from database ,it load when any change or add in database ....
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Dec 1, 2010
In my Admin page, I have a drop down list containing all current user tables in the database. The user chooses one.
My DetailsView below uses that parameter to populate itself with data from that table. The stored procedure used to select the data passes a string to sp_executesql. The string is concatenated from a select statement and the tablename parameter. Can I do something similar for Update/Delete statements? I'm not sure of the best approach, given that I won't know which/how many fields will be in the DetailsView at runtime, and which of these are keys - the choice of table depends on the user. I think Insert will be straightforward - am I right? I would like to streamline things as far as possible. Is it possible to dynamically pass in the values in, say, a string, and get my stored procedure to understand them? And what's the best method of grabbing the values from the DetailsView in this situation?
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Feb 14, 2011
I have a website that sales associates access to view account information with clients. S.A's can only view information for accounts that they are tied to. Some clients have more than one account, S.A's can be tied to more than one account, but not all accounts of one client need to be tied to one S.A.
On the account info pages, I have account numbers (dynamically displayed labels) displayed of other accounts that the account client is associated with, which the S.A's can see. I'm modding this so that if the S.A has viewing permissions of any of the other accounts on that list of accounts, that instead of a label being displayed, a button directing them to that account page will display instead. In order for this to work, I have to attach a security function to the button, otherwise the page will blow out on the S.A's.
So I'm running a piece that is displaying a button instead of a label, which is working fine. My problem is when I try to attach the security event to the dynamically displayed buttons. It seems that the page just posts back and doesn't execute my code at all.
On my Page_Load, I'm running this after the buttons and labels are displayed:
For x = 0 to tblAccountList.Rows.Count - 1
'use a try to target the button, use catch to handle if it's instead a label, only one cell per row.
Try
Dim accountLink as Button = tblAccountList.Rows(x).Controls(0)
Addhandler accountLink.Click, AddressOf Me.PermissionViewCheck
Catch ex as InvalidCastException
Continue For
End Try
Next
I don't have any code checking for postbacks or anything like that, but the "PermissionViewCheck" event never fires and just reposts the page.
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Jan 13, 2010
I have an ASP.NET application which requires output caching. I need to invalidate the cached items when the data returned from a web service changes, so a simple duration is not good enough.
I have been doing a bit of reading about cache dependencies and think I have the right idea. It looks like I will need to create a cache dependency to my web service.To associate the page output with this dependency I think I should use the following method:
Response.AddCacheItemDependency(cacheKey);
The thing I am struggling with is what I should add to the cache?
The dependency my page has is to a single value returned by the web service. My current thinking is that I should create a Custom Cache Dependency via subclassing CacheDependency, and store the current value in the cache. I can then use Response.AddCacheItemDependency to form the dependency.
I can then periodically check the value and for a NotifyDependencyChange in order to invalidate my cached HTTP response.The problem is, I need to ensure that the cache is flushed immediately, so a periodic check is not good enough. How can I ensure that my dependant object in the cache which represents the value returned by the web service is re-evaluated before the HTTP response is fetched from the cache?
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Feb 22, 2010
I need to dynamically alter my stylesheet link in my masterpage.
I have the code below but the css isn't displaing correctly and the outputed HTML looks like below..
Outputed HTML
<link href="../Content/%3C%25=c.Area_Name%20%25%3E.css" rel="stylesheet" type="text/css" />
Stylesheet reference
<% foreach (var c in (IEnumerable<Categories>)ViewData["Categories"]) { %>
<link href="../../Content/<%=c.Area_Name %>.css" rel="stylesheet" type="text/css" />
<% } %>
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Feb 22, 2013
I created 3 category table. categry1,categry2,categry3. product table.
And then use of gried view add ,edit ,update ,delete product . in product table.
In gridview retrive data from product table . i select categry from dropdownlist in gridview categry1, categry2, categry3 and save update dropdown list category value dynamically in product table. not define value static in source code.
When select category 1 change on selected index change categary 2 or 3.
In my code I used text box to ediit update delete. but here i will use dropdownlist.
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Jan 25, 2010
i have an update panel, which contains a repeater inside. The repeater's data source will change on postback. The repeater will generate a div for each item.
I need to set the height of the div that is generated by the update panel to the actual total height of the div inside the repeater.
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Jun 20, 2010
Basically I have a usercontrol that is setup to capture a persons education details. I want to have a button inside the update that when the user clicks loads the usercontrol below the previous usercontrol.
I have got as far as
UserControl userControl = (UserControl)this.LoadControl(controlName);
this.Panel1.Controls.Add(userControl);
however I am not sure how to keep the orginal usercontrol and not overwrite it with the newly loaded usercontrol.
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Sep 18, 2010
In my webform, i have 3-4 textbox, on there textchange event i have to fetch data from database and put it on the form. I have taken another html table (with runat="server") below textbox and and in textchange event created a new <tr>, <td> and simply added contents in <td>, then finally added <tr> in the table. This is done in UpdatePanel.
When i enter something in textbox1 data is added in that table,that's fine. But when i enter something in 2nd textbox the previous data is overridden. My requirement is that if 2nd textbox's text changes than another row with appropiate data should be added, i.e., now two rows. Silimarly if 3rd ,4th textbox data changes then subsequently 3 or 4 rows should be displayed.
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Jun 22, 2010
I am hoping someone can help me out. I have a web application that contains a usercontrol think "employment details" a user can enter a previous employment detail.
I have created a page that contains an update panel a placeholder and a button. The button I want to use to load a new copy of the same usercontrol. Can anyone point me in the right redirect?
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Mar 9, 2010
I have some code that I am working on that uses an UpdatePanel and some dynamically created buttons to perform functions. The problem is that the dynamically created buttons aren't working the same as my test static button, which is behaving exactly as it should be.
So I was wondering if someone would be willing to simply post an example (in VB.NET or C# please) of the following:
An UpdatePanel has a Label and a Placeholder inside of it
The Placeholder has a dynamic button added to it
Clicking on this button will make the Label say "Hi" without performing a full page postback.
If I can just get that much to work, I am sure that the rest of the code will be fine. I just can't seem to get my dynamic buttons to act like my static ones do in an UpdatePanel.
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Feb 4, 2010
I have two image buttons in a gridview, one to approve the opening of the record and one to approve the closing of the record. I have added a CommandName to each button (OpenApproved and CloseApproved) and in the grids rowcommand I would like to update the database with the Username of the person clicking the button, Username goes into either the OpenLeadApprover or CloseLeadApprover field depending on which button is pressed. The grid has a sqldatasource with an Update stored procedure which has three parameters, @WorkOrderIDWhat I have tried to do in the RoeCommand event is declare a variable for the sqldatasource and add the parameter value to it, then run the update command. Here is the code:
[Code]....
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Oct 4, 2010
I have a pretty simple C # page that when the page first loads, a bio is diplayed in that center section based upon sql executed from my code behind. I have 4 link buttons on the page that when clicked, fill that center section with other content based upon which link button they clicked (News, Publications, Contact Info, and Presentations). I was all done, then I thought about using an UpdatePanel to get rid of the annoying "flicker" when the page posts back on the click of the link button.
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