Accessing User Control Properties Defined In Code Behind In Markup?
Feb 9, 2011
I have a public property defined in code behind of a user control. I want to toggle visibility of controls in the markup based on the property's value.
If the answer to this question exists somewhere, I'm no good at searching for it. This is sort of a simple question, the response being two parts: (1) is it possible? (2) if so, how?
I've created a web user control for my site's footer. In my web.config I have it registered like this:
[Code]....
Then, within the pages on my site, I simply insert it like this:
[Code]....
But obviously, that didn't work. I get this error: The type or namespace name 'FooterControl' could not be found (are you missing a using directive or an assembly reference?)
So I'm really not sure what to do at this point. I can put all of my code in the ASPX file and make my life easier, but I would kind of prefer not to.
I am creating a user control that I wish to have inner properties as well as normal attributes. Although the actual function of the control has nothing to do with, say, UpdatePanel, I am trying to create something with similar ASPX markup. The developer designing the page should be able to use my control like:
<ns:MyControl ID="someID" runat="server" SomeOtherAttribute="true"> <ContentTemplate> <asp:Label ID="someLabel" runat="server" Text="Normal page markup and controls should go here" /><br /> <p>This should be OK too.</p> </ContentTemplate> <ControlEvent ControlName="idOfOtherControl" Event="Click" /> <ControlEvent ControlName="idOfSomeOtherControl" Event="MouseOver" /> </ns:MyControl>
Also acceptable would be wrapping the ControlEvent tags in some other tag, more like what happens when using UpdatePanel:
<ns:MyControl ID="someID" runat="server" SomeOtherAttribute="true"> <ContentTemplate> <asp:Label ID="someLabel" runat="server" Text="Normal page markup and controls should go here" /><br /> <p>This should be OK too.</p> </ContentTemplate> <ControlEvents> <ns:ControlEvent ControlName="idOfOtherControl" Event="Click" />........................
I want to be able to extend the System.Web.UI.Page class and then easily access those properties from the Markup. I know I can do it from the codebehind, but is it possible from the Markup?
i have a <div> named 'mydiv' on a web page and have set it's runat property as <server> so it is visible within
my vb.net server side code.
i can see the mydiv within the server side code.
my question:
how do i adjust the height/style of the <div> withion the vb.net code so that whe the page is posted back the new height/style settings apply. how do i get to the style properties server side?
I am using my aspnet membership for storing user profile related information in the database and I am looking for a way to access that information out of database from a function like Member.GetProfile. I am just wondering of any of the membership classes give thet functionality that I can actually access the information out of Membership database.
Somebody suggested me follwowing thread:
[Code]....
I am "Profile" object is not recognized in my code I think they are trying to refer to some some instance of a class here by the word Profile but I am not sure what instance is that.
I am currently working on a page that displays a set of questions as retrieved from an XML source. I can print the questions out fine by using a ListView and the ItemDataBound event. On PostBack it seems I can get some property values (Text), but not others (ID). I need to get the ID so I can match up the answer to the appropriate question.
Here is the ListView:
[Code]....
I just don't understand the Life Cycle stuff that well for advanced issues like this. I'd prefer not to use the Request.Form collection for this, but I will if it's the last resort.
Say I have a web site with a master page and an aspx page.In my ASPX page, I am pointing to my masterpage with the MasterType tag.<%@ MasterType VirtualPath="~/mymasterpage.master" %>Say, I've defined a label in the markup of my master page.If you look at the designer code, this label should be something like thisprotected global::System.Web.UI.WebControlIf I type in this "Master.label1", the complier will complain that the control is inaccessible due to the protection level" and rightly so, as label1 is automatically defined as "protected"
I'm new to custom server controls and I'm hoping to use them to build various 'modules' for different sites I build to cut down on duplicate code.I'm familiar with custom user controls in which I can create an .ascx & .ascx.vb file which can then be imported into an .aspx page and used freely.However, with custom server controls I cannot find a way of using markup/html code. Is this possible at all or must all code be created programmatically?
I was having a discussion with a co worker about some controls I implemented. He objected to my use of dynamicly instantiating controls in the code behind, because it will be slower than specifying the control in the markup. I thought he was talking about output cacheing which to my understanding only caches the rendered output of a page not the instantiated Page object. He said no its a different type of caching. Unfortunately he was unable to give me any documentation to backup the claim so I am wondering if anyone here has ever hear of any such type of caching, and if so is there any documentation on it that I can refer to.
I've got a web site that has a master page and that master page (mpMaster that has a user control ucControl1) which has a sub user control (ucControl2), this user control has a property which accepts a value. Now, I have a page that uses the master page and on this page I have another user control (ucPageControl), I need to find a way of setting the value in ucControl2 from ucPageControl. Is this possible at all?
i create a composite control as can be seen in code below, and add this control to webform, assign FormView1 to the HeaderControlName property, Run the page, the system will generate parse error message : Cannot create an object of type 'System.Web.UI.WebControls.FormView' from its string representation 'FormView1' for the 'HeaderControlName' property. However, if i don't assign FormView1 in design screen and manually (through coding) assign FormView1 to the custom control on init, it works as expected.
custom control public class CmdTest : CompositeControl { public virtual FormView HeaderControlName { get { object oObject = ViewState["HeaderControlName"]; return (oObject == null) ? null : (FormView)oObject; } set { ViewState["HeaderControlName"] = value; } } protected override void CreateChildControls( { Controls.Clear(); Button xx = new Button(); Controls.Add(xx); } } webpage.aspx (assign FormView1 in design time, it will generate error) <Utils:CmdTest ID="CmdTest1" runat="server" HeaderControlName="FormView1" /> webpage.aspx (didn't assign FormView1 in ASPX, but assign it on Init Code, it works) <Utils:CmdTest ID="CmdTest1" runat="server" oninit="CmdTest1_Init" /> Webpage.aspx.cs protected void BsCmdTest1_Init(object sender, EventArgs e) { CmdTest1.HeaderControlName = FormView1; }
I'm building form validation controls for our C# ASP application. The bulk of the work is handled by a BaseValidator control (subclassing System.Web.UI.UserControl), which also has the markup for the validation output. This is then extended by subcontrols like PasswordValidator, that provides the Validate method and any extra fields needed by that validator control.
(The end goal is to have controls like <uc1:PasswordValidator ControlId="txtPassword" /> which we can plop into any form with minimum duplication.)
However, PasswordValidator.ascx.cs cannot access the form elements defined in BaseValidator.ascx; the only way I've found to do so is to duplicate the markup in each subcontrol's *.ascx file. How can I extend BaseValidator.ascx.cs and access BaseValidator.ascx's markup in the subclass?
I have a user control (uc1) which inherits from uc2. uc2 has a user control (uc3) declared in the markup. I am trying to access uc3 from uc1 but I get NullReferenceException. I thought due to inheritance uc3 would instantiate but looks like I am missing a step.
Clarification:
How does the child user control inherit the markup from the base class? The server controls in the base user control are null in the code behind of the base user control. Why?
I want to use a couple of instances of the same control on a page. The user control is intended to display a list of records in a repeater. The aim is that the second control will show a list excluding the IDs in the first control The control has a number of public properties, including IDsInThisList, and IDstoExclude. The query will exclude the IDs in the second property.
What I would like to do is get the record IDs from the first instance of the control (IDsInThisList), and pass them to the second contro as the IDsToExclude.
I have a test page where I am setting the properties of the controls in code. As you might guess, it's not working! The first control displays the top 3 items, as desired, but the second display the records 1-7, rather than records 4-10 because it is not receiving the IDstoExclude from the first control When I response write the IDstoExclude from the first control in my testpage, the string is empty. (if I do it from within the control, it shows the IDs)
How can I get the controls to fire in order and pass values to each other?
Screen grab of test page + uc and test page code attached
I have a base user control (inherited from System.Web.UI.UserControl)
public delegate void MyEventHandler(object sender, MyEventArgs e); public event MyEventHandler ControlLoaded; //Fire the event from here protected override void OnLoad(EventArgs e) { MyEventArgs cmdEventArgs = new MyEventArgs("somearg"); ControlLoaded(this, cmdEventArgs); }
I have several controls that are derived from this base user control.
On the host ASPX page, I need to subscribe to the ControlLoaded event.
protected void Page_Load(object sender, EventArgs e) { //subscribe to the event //This line DOES NOT WORK as I cannot attach event to a base control - It needs an instance of the user control which I don't have BaseUserControl.ControlLoaded += new MyEventHandler(ControlLoaded); } private void ControlLoaded(object sender, MyEventArgs e) { // some control has been loaded }
I created a user control in Asp.Net which I populate with <asp:Table id = "...." /> this table has columns that contain dropdownlists, textfields and other web controls. In the code behind I am not able to access these web controls, is there a way I can access them. or I shouldn't be doing that in the code behind of the user control? here is my ascx code markup:
I am developing an application in which I have to use a User Control.I have created a user control in which I am using
- A Label (whose text will be dynamic) - 3 Textboxes (whose values will be also dynamic).
So far everything is working fine.Now I used this user control in a aspx page and at the page_load i have to loop thru all the instance of this user control and assign values to them and here the problem begins.The values are not being assigned to the controls.
Here is the code which i have written to loop thru User Control instances and assign values to them.
I have added a few WebUserControl's to a form and I want to check their properties values in a code behind (vb) when a user click a button.I tried unsuccessfully to get a reference to these controls using the TypeOf and GetType functions...How do I get a reference to the webUserControls ?
i created a user control and place a button on it.i drag dropped the user control on a aspx page and wrote the grid load and button clicks in the
user control.now i got a requirement to use the same user control grid and button to again use on the same page.however the data populated will be different and the button click functionality will be different.how can i reload the different data on the second grid as i had already wrote the code in the first one
When I first created a timer (Timer1) I handled the Tick event. No problem, intellisense worked and the timer control was declared then. I toggled it's enabled property, no problem.
I just went to look back at the _Tick event for the Timer1 control, and it has the blue underline mark in VWD that says that Timer1 is undeclared. I looked back at the markup and the <asp:Timer ID="Timer1" runat="server" ... /> control is there. I don't understand why all of a sudden my code-behind class is not recognizing the ID of my timer control.
The page runs fine, but it is throwing me off why VWD is seeing this as an error when I hard-type the control name.
