C# - Find A Control Or Page A Control Is Embedded In?
Jan 9, 2011
I've written a web user control which I want to be able to drop into the markup for either aspx pages or other web user controls.I need my user control to be able to easily and efficiently work out if its inside another user control or an aspx page. My initial idea is to do it recursively with checks on the Parent property - continue looking up the nesting hierarchy until I find either a web form or a user control - but I'm not sure this the best way of going about this.
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Similar Messages:
Feb 23, 2010
I know Silverlight controls can be embedded in an ASP.NET page but is it possible to do the same for a WPF control? The reason I am asking is because we have Infragistics which has a datagrid that can be flipped to have the columns on the left with the rows of data going down vertically. This is only in their WPF package though and I am trying to figure out a way to plug this in to an ASP.NET page.
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Jan 17, 2011
With embedded Javascript in an html page, I would use the following to get the ID of a control.
[Code]....
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May 19, 2010
I have a silverlight application project in my solution. The other project is a web application project that has a .xap file in ClientBin.
When I created the silverlight project, it asked if I wanted the asp.net application to host it (and I said yes).
In the root directory, there is a test page for the silverlight control. That loads the control.
In another directory, I insert the SAME asp markup to get the silverlight control to launch again.
Nothing happens.
Why would the silverlight launch on one page and not on the other? how to documentation about dependencies that I might not know about?
I've put a reference to Silverlight.js on the page as well.
Here's the markup:
[code]....
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Dec 1, 2010
I'm trying to find a TextBox in the code-behind page, it's inside a nested master page and also then inside another control container (it's inside ctrlCheckoutShippingAddress also) .
I've tried this:
[Code]....
[Code]....
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Nov 10, 2010
I have on dropdown that show hide user control. In the user control i have Ok and Cancel button.
When the dropdown change i want to apply ValidationGroup on the Ok button that is inside UserControl.
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Mar 15, 2010
I have a drop down list embedded in a menu panel in my master page. This ddl fetches it's list items from my SQL Server. They are:
1. Select a type --appended during page load
2. Green type -- fetched from SQL server via a datasource
3. Red type -- fetched from SQL server via a datasource
4. User Manual -- appended during page load
For the sake of simplicity my website has 4 pages. When the 'Select a type' list item is selected - the user should be taken to a general 'Introduction' page. When the 'Green type' - the user should be taken to a 'Green' page - and etc.
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Oct 13, 2010
I have a text box that is intended for an Email address. I am using a Regular eExppression validation control to validate the email address. When I place the following lines of code in a blank web Form, the validator works properly.
<asp:TextBox ID="Email" runat="server" CssClass="DefaultTextBox TextboxWidth" MaxLength="80"></asp:TextBox>
<asp:RegularExpressionValidator ID="valEmail" runat="server" ControlToValidate="Email" ErrorMessage="Invalid Email address" SetFocusOnError="True" ToolTip="Invalid Email address" ValidationExpression="w+([-+.']w+)*@w+([-.]w+)*.w+([-.]w+)*">*</asp:RegularExpressionValidator`>
However, when I use the validation control within a CreateUserWizard control, it does not seem to fire but other validation controls (Required and Custom validators) do fire, but not the regular expression validator above for validating the address. The following is my complete web page. The two controls above appear unchanged in the code below, they are simply embedded into the wizard control mentioned.
<%@ Page Title="" Language="VB" MasterPageFile="~/Master Pages/MasterPage.master" AutoEventWireup="false" CodeFile="Login.aspx.vb" Inherits="Login" %>
<%@ MasterType VirtualPath="~/Master Pages/MasterPage.master" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="Server">
<style type="text/css">
.TextboxWidth
{
width: 200px;
}
.Heading
{
font-weight: bold;
font-size: 12pt;
color: rgb(44, 68, 105);
}
.StdFrameWidth...............
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Apr 15, 2010
i have problem in using ajax control , till morning it everything was file , now when i add any new ajax control it shows the error Control canot be created because visual studio cannot find the control's type in the control assembly then if i press OK it says The operation could not be completed . invalid FORMATETC structure
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Dec 9, 2010
Is there a simple way to find a control in ASP.NET by id (in any nested container)? Other than traversing whole controls tree.
Something like this example:
TextBox tb = new TextBox() { ID = "textboxId"};
panel3.Controls.Add(tb);
And in other method/class:
TextBox nameTextbox = MethodToFindControl("textboxId") as TextBox;
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May 7, 2015
I have hyperlink in page
<asp:HyperLink ID="HyperLink1" runat="server" class="lblMenuMessage" NavigateUrl="~/Admin/صندوق-پیام.aspx">صندوق پیام</asp:HyperLink>
and css
.lblMenuMessage
{
float:right;
text-align:right;
width:150px;
margin:0 12px 0 0;
color:white;
text-decoration:none;
}
and I want change it's color in behind code so I wrote:
(this.Master.FindControl("HyperLink1") as HtmlGenericControl).Style["color"] = "black";
but below error happen:
Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.Source Error:
Line 13:
Line 14: (this.Master.FindControl("ADMenuMessage") as HtmlGenericControl).Style["background-image"] = Page.ResolveUrl("~/Image/ADactivmenu.png");
Line 15: (this.Master.FindControl("HyperLink1") as HtmlGenericControl).Style["color"] = "black";
Line 16: }
Line 17: }
how I can change hyperlink textcolor in behind code?
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Dec 11, 2013
I looked at your example URL....I have ScriptManager in masterpage how call ScriptManager from masterpage in editorPage.aspx if (Script Manager 1.IsInAsyncPostBack)
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Jun 24, 2010
The code was working correctly until i used a master page.
R.aspx
vb Code:
Dim athUsr As New AuthenticateUser()
athUsr.IsLogIn("~/Login.aspx")
If (IsPostBack = False) Then
Dim objcoll As UserRegistrationColl
objcoll = UserRegistrationProvider.GetDynamic(Nothing, "UserId='" + SessionManager.UserId.ToString + "'", Nothing)
[code]...
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Sep 2, 2010
I am loading a control to a page dynamically with LoadControl("src to file"). In the usercontrol i have a validator and some other controls that i would like to access from my page. I canät get it to work, null pointer exception. Scenario is like this. I have a Edit.aspx page which loads the EditTemplate.ascx usercontroll. I would like to get information or find the controls in the EditTemplate from the Edit.aspx site. I have tried exposing the controls and validators as properties but how do i access them from my Edit.aspx?
Example code:
Edit.aspx, the control is later added into a
Control control = LoadControl("src to ascx");
TemplatePlaceHolder.Controls.Add(control);
EditTemplate.ascx
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="CompanyImageFile" ErrorMessage="RequiredFieldValidator"></asp:RequiredFieldValidator>
CodeBehind
public partial class EditTemplate : System.Web.UI.UserControl, IEditTemplate {
public RequiredFieldValidator Validator {
get { return this.RequiredFieldValidator1; }
set { this.RequiredFieldValidator1 = value; }
}
From the Edit.aspx site i would like to check the validators isValid property. Isvalid is set in a Save method. The save button that saves the template is located in edit.aspx, so the post in done from that page. So the question is how to get a hold of the property from the usercontrol in the edit.aspx page, where and how should this be done?
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Mar 19, 2010
I am having couple of check box in my web page.How to I find them using VB SCRIPT?I want to know which of them is selected?
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Mar 31, 2012
I have a MasterPage with a Textbox and an imageButton, one this MasterPage im using a web.Sitemap and global.asax for navigation, its works fine.Im im one the page URL... i get this in the browser bc of the global.asax URL...So its works fine the navigation.My problen is that when i type ind a value in the textbox on the masterpage and click the imageButton its then PostBackUrl="~/imailtest.aspx" that page isent using the masterpage but its looking for the id for the textbox on the masterpage.
But every time i hit the imagebutton i get this error: HttpException was unhandled by user code.The file /ebbe/Butikken do not exsist.And it ref to the codeline ct=Me.Prev..... line.
So its PostBack me from the default.aspx (With masterpage) to the imailtest.aspx as it need to, i just cant get the vaule from the textbox id="newsletter" from the masterpage.bc. it cant find the page.My imailtest.aspx Code_Behind is:
Code:
Partial Class imailtest
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
[code]....
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Jan 24, 2014
On masterPage i have button btnTest, how hide button from masterPage on userControl.ascx
example:
btnSecondPage_click
{
btnTest.visible = false;
}
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Jan 5, 2010
I have a method that needs to find the repeater control to add data. I try the code below, but keep getting an error "not set to an instance of an object."
hyp = (HyperLink)Repeater1.FindControl("orderID");
hyp.ID = docName;
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Apr 1, 2010
i am using master pages. i want to use findcontrol. but i am not getting expected result. my scenario:
Master Page--> ContentPlaceHolder-->Html Table-->Panel-->placeholder--> here i am dynamically generating textbox controls.
i am using following syntax:
TextBox txtAmt = (TextBox)this.Master.FindControl("EmpJobInfo_Content").FindControl("GBTable").FindControl("PanGB").FindControl("PlaceHolder1").FindControl("tbl").FindControl("txtinstallment");
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Jan 28, 2011
I have an aspx web application in which 1 aspx page and 1 web user controls exist. I added 4 instances of the user control in aspx page. There is a remove button in user control which is used to remove the control from the aspx page. If I click on remove button of the user control, how can I find that which user control's remove button is clicked from the aspx page.
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Jul 26, 2010
I have one master with one link button ,and i am using this master page in view page .
I want to get link button control in View page .
As i am trying to get it from Javascript in view page using document.getElementById() but its giving null.
Is there any way like asp.net where we can access easily using runtime ID .
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Oct 5, 2010
I have use embedded code to assign the value to label's text property.But the assign value is not rendering.Here is my code sample,
<%lblProposedYear.Text="Hello"%>
I can not display the text "hello" at the time of page load.
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Mar 31, 2010
So all I want to do is simply find a user control I load based on a drop down selection. I have the user control added but now I'm trying to find the control so I can access a couple properties off of it and I can't find the control for the life of me. I'm actually doing all of this in the master page and there is no code in the default.aspx page itself.
MasterPage.aspx
[Code]....
MasterPage.cs
protected void goToSelectedPage(object sender, System.EventArgs e)
{
temp1 ct = this.Page.Master.LoadControl("temp1.ascx") as temp1;
ct.ID = "TestMe";
this.UpdatePanel1.ContentTemplateContainer.Controls.Add(ct);
}
//This is where I CANNOT SEEM TO FIND THE CONTROL ////////////////////////////////////////
protected void lnkSave_Click(object sender, System.EventArgs e)
{
UpdatePanel teest = this.FindControl("UpdatePanel1") as UpdatePanel;
Control test2 = teest.ContentTemplateContainer.FindControl("ctl09") as Control;
temp1 test3 = test2.FindControl("TestMe") as temp1;
string maybe = test3.Col1TopTitle;
}
Here I don't understand what it's telling me. for "par" I get "ctl09" and I have no idea how I am supposed to find this control. temp1.ascx.cs
protected void Page_Load(object sender, EventArgs e)
{
string ppp = this.ID;
string par = this.Parent.ID;
}
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Jan 13, 2011
I'm having trouble figuring out how to do the following:On every page (or every page I so desire), I'd like to put a common control widget (e.g. think - Search functionality that contains a textbox+button). What's the best way to do this, and who handles the submit button (assuming it is a submit button)?i.e. what does my ViewUserControl look like? Does it have a form? does it use jQuery onclick""? Does it post to the main View's action method, or can I redirect it to another Controller/Action
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Mar 10, 2011
I have created an asp.net usercontrol that should list users in a number of applications. For that purpose, the control renders a repeater (foreach application) which in turn renders a gridview (with users for that application).
The control renders fine, except the fact that columns in the gridview are not sortable. Nothing happens (no postback) when clicking the headers. Apparently, no JavaScript is rendered to perform the postback when clicking the header.
This is the code:
[code]....
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