User Control Inherits From Custom Control?
Aug 27, 2010I have an custom control that extend System.Web.UI.UserControl. Is it possible to inherit user control from this custom control?
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I think this will come "close" to what I'm trying to do - just get a treenode to have a CSS tag and render properly.
I have an App_LocalResources directory and a file called CustomTreeNode.vb. Inside that file is the following code:
[Code]....
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[URL] the steps mentioned in the link.
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Feb 18, 2011I'm attempting to create a simple menu user control just as outlined here.
The attached code results in an "Object reference not set to an instance of an object" error, but I can't figure out why.
<%@ Master Language="VB" CodeFile="MySite.master.vb" Inherits="MySite" %>
<%@ Register src="Controls/Menu.ascx" tagname="Menu" tagprefix="my" %>
<html xmlns="http://www.w3.org/1999/xhtml">
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Custom Server Controls :: Unable To Use A Web User Control Inside Another Web User Control
Mar 10, 2011I have a web user control that represents a simple message box. It is used to display simple messages like "Item has been deleted", or "The item was saved successfully".
On the other hand, I have another web user control that represents the item in the form of an editable form (I made this a user control because this is used in two different pages). I want to embed an instance of the message box user control inside the editable form. I am writing this right after the @Control directive:
[Code]....
Instead of using @Register directives, I register the user controls in web.config and so far this has worked just fine.
With the above markup, the project compiles, but whenever I try to navigate to a page that contains this construct, I get an HttpParseException exception. Furthermore, Visual Studio states that the tack w7rc9:MessageBox doesn't represent a known control.
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View 2 RepliesC# - Add Child Nodes To Custom User Control Derived From System.Web.UI.Control?
Sep 4, 2010I would like to know how to add some additional child nodes to a custom user control class derived from System.Web.UI.Control. For example currently I have a control that contains no child nodes and on the design surface looks like the following.
<cust:MyCustomControl id="ctlMyCustomControl" runat="server" attribute1="somevalue" attribute2="somevalue" ></MyCustomControl>
What I am looking for is to have the ability to add n number of child nodes to this control from the design surface and then access their values from the code. So adding to the control stated above.
<cust:MyCustomControl id="ctlMyCustomControl" runat="server" attribute1="somevalue" attribute2="somevalue" >
<childnode1>value1</childnode1>
<childnode2>value2</childnode2>
</MyCustomControl>
It is not clear to me how to access the child nodes.
Does A Composite Server Control(inc. User Control, Custom Server Control) Normally Encapsulate Css Properties?
Nov 7, 2010If a composite server control normally encapsulate styling information inside, it is an example of code encapsulation and modularization. However if css properties are included inside the composite control, it is not ideal for code/styling separation and css code re-use principles. Now which consideration should be the main consideration?
View 2 RepliesCustom Server Controls :: User Template Control Or Custom Server Control?
Jul 22, 2010I need to develop control (template or user) which must have subtags with some items.
For example :
<SomeControl runat="server" id="scTest">
<column1>TestColumn1</column1>
<column1>TestColumn1</column1>
<column1>TestColumn1</column1>
</SomeControl>
This control may contain some other web server controls such as GridView.I need explanation of experienced developers, how to do that - take me to the right way
C# - Add Reference To Method In Custom Control To A Child Control Created In That Same Custom Control
Feb 3, 2010I have a custom control that is based off the gridview control located at: here The control is basically a gridview that automatically creates a column of checkboxes that can be used to "check" individual rows in the gridview. During the gridview's "CreateColumns" event, the "checkboxcolumn" is created dynamically. The checkboxcolumn also contains another checkbox in the header that is used to "select/deselect all" checkboxes in the column. Since the gridview does not automatically remember the state of the checkboxes in the checkboxcolumn on postback, I added a method to the control called "SaveCheckBoxState" which stores the indexes of the checked rows in Viewstate, and then I modified the "OnRowDataBound" event to check the Viewstate and reset the checkboxes based on the Viewstate.
I then added a call to "SaveCheckBoxState" in the gridview's OnSorting and OnPageIndexChanging events. This works great so long as I'm sorting or changing pages. However, I need it to update the viewstate everytime someone clicks or unclicks one of the checkboxes. At this time, the checkboxes are rendered with an onclick event that calls some javascript to highlight the row, or in the case of the checkbox in the header, to select/deselect all checkboxes. I need to call the "SaveCheckBoxState" method from the javascript used by the customcontrol, or I need to find a way to modify viewstate from javascript and perform the same action as "SaveCheckBoxState".
I've tried adding the "SaveCheckBoxState" to the onclick event declaration in the checkboxes, but when run, it simply tells me that the method is undefined. It doesn't exist in the parent page, and I don't think I should have to make an event for the parent page to pass the click to. It seems to me this should be all self contained within the custom control. Does anyone know how I can acheive this? Here is the code for the gridview OnPreRender event where the onclick event of the checkbox is set:
protected override void OnPreRender(EventArgs e)
{
// Do as usual
base.OnPreRender(e);
// Adjust each data row
foreach (GridViewRow r in Rows)
{
// Get the appropriate style object for the row
TableItemStyle style = GetRowStyleFromState(r.RowState);
// Retrieve the reference to the checkbox
CheckBox cb = (CheckBox)r.FindControl(InputCheckBoxField.CheckBoxID);
// Build the ID of the checkbox in the header
string headerCheckBoxID = String.Format(CheckBoxColumHeaderID, ClientID);
// Add script code to enable selection
cb.Attributes["onclick"] = String.Format("ApplyStyle(this, '{0}', '{1}', '{2}')",
SelectedRowStyle.CssClass,
style.CssClass,
headerCheckBoxID);
// Update the style of the checkbox if checked
if (cb.Checked)
{
r.BackColor = SelectedRowStyle.BackColor;
r.ForeColor = SelectedRowStyle.ForeColor;
r.Font.Bold = SelectedRowStyle.Font.Bold;
}
else
{
r.BackColor = style.BackColor;
r.ForeColor = style.ForeColor;
r.Font.Bold = style.Font.Bold;
}
}
}
Custom Server Controls :: Custom User Control That Fills Itself?
Feb 15, 2010I'm new to all of this, so go easy on me. This should be an easy one. I have created a custom SmartContentBlock user control for a CMS.The control works, but only if I invoke the Fill() function in the Page_init event in the codebehind of the ASPX page. My goal is to modify the class file so that the Fill() in the codebehind is no longer neccesary. So, for reference, here's the gist of the current situtation.Controls.cs
[Code]....
ASPX Page
[Code]....
User Control Vs Custom Control?
Sep 20, 2010i want to know where user controls should be used and where custom control should be.in what ways they can be best used.
View 1 RepliesServer Controls In User Control Are Null When User Control Serves As A Base User Control ?
Jun 4, 2010I don't think I understand fully how ASP.NET does inheritance of controls.I have a user control, ucBase, which has an asp.net label in the ascx file. Code behind references the label and it works fine during run time if the control is not a parent for another user parent.
If I have another user control, ucChild, inheriting from ucBase, the label in ucBase's code is always null. ucChild has no controls in its ascx fileThe server controls (like the label) needs to be declared in the ascx file and not created programmatically.What needs to be done for ucBase to see its own controls when it's a parent user control?
Custom Server Controls :: Save User's Input In User Control?
Mar 28, 2011I have a user control (ascx file) that contains an interface for users to change the data retrieved from the db. So, I am displaying data and most of this data can be edited by the user. When the user enters text into a textbox, and clicks "Save Changes", the value they typed in is lost and not persisted to the database. I realize now this is because the SaveChanges button does a postback, and the user control gets reloaded with its original valuesbefore the code within my SaveChanges button gets executed. I'm not sure if there are properties I need to set to save the input data, or if I need to write my own code to do it. What is the generally accepted method to do this? (Also, all of the controls in the ascx file are wrapped in an Update Panel.)
View 8 RepliesCustom Server Controls :: Paging And Sorting Gridview Custom Control Inside Of A Wizard Control?
Dec 24, 2010here's a situation and I would appreciate your response.
I have programmatically created the Wizard control:
Page_Load(obj s, evargs e)
{
Wizard ClaimDetailWizard = new Wizard();
foreach(int item in selectedItems)
{
//create new step
//added custom control to new step
//add step to wizard
}
//added wizard to a placeholder on a page
}
Based on List I get from Session i added new steps to my wizard To each step I had added a custom control
Each custom control in tern contains another custom Gridview Control in it.
So here's the problem when the page loads for example for two steps. All is good Wizard does what it's supposed to do.
But when I try to use sorting or paging in that custom Gridview. Somehow it displays the gridview I should see in the next step of the wizard.
Also what I'm noticing through debugging. Is that when I press next in the wizard I go back to the original page where I do all of the code specified above, and it recreates the wizzard. But it goes to the next step. Is this the way wizard supposed to work? Just doesn't seem very efficient.
Custom Server Controls :: Add This Control To The Page,an Alert To Check The Text Value Of The Custom Control?
Dec 20, 2010created a Custom Textbox Control that is intended to be a "masked date" textbox, so that I can handle different ways a user might enter in a date and make it work no matter what.I did this by creating a custom control with 3 separate Textboxes one for month,one for day one for year,then do some handling for different things that could be entered and it would all work.
The problem I am having is,when I add this control to the page,if I do an alert to check the Text value of the custom control it just gives me "[ServerControl1]" even if I enter in a date.
I tried doing an AutoPostback after entering so that it would refesh the Viewstate to have the values of the textboxes but the control doesnt seem to actually postback, even though I have it enabled.accessing the Textbox value after someoen
has entered a date?first custom control I have created and have been using google.
My Server Control Code is as follows:
[Code]...
Accessing Property Value Of A Custom Control By Another Custom Control In Design-time
Oct 18, 2010I created an Extender which has a custom property that drills down a list XML elements from an xml file, where users can select xml elements during design-time. This works perfectly fine. However, my code only has a hardcoded xml filename (source of the xml elements list) and I need to change this by maxing the xml file user-specified.
What I did is that I created another control (panel) which has a custom property that when clicked (through the ellipsis), it will allow a developer to select the xml file which is supposed to be the source xml file that the Extenders shall use. The filedialog from custom panel's property works perfectly fine.
However, my problem now is that when I drag-drop my Extender, I cannot find a way to get the property value of the custom Panel Control which contains the xml filename. I tried creating a static variable which I thought the custom controls can share but VS2010 is breaking.
Add Custom User Control To Published Web Project
Sep 22, 2010I have a published web project. I want to add some .ascx files (with .cs & designer.cs files) to that published web site. These are simple custom user controls that access methods already part of the original application. Question? Is it possible to just drop these in the published web project without building the entire solution? If not why? When I drop these files in and run my application I get the error: "Parse Error: Could not load type 'the name of my custom controls namespace'". There is not a lot of code to show so this is all I have.
Default.aspx
<%@ Page Language="C#" MasterPageFile="~/MasterPages/TwoColumn.master" AutoEventWireup="true"
Inherits="ApplicationName.Web.Default" CodeBehind="Default.aspx.cs" %>
<%@ Register TagPrefix="uc1" TagName="CustomControl" Src="~/Controls/Custom/CustomControl.ascx" %>
<asp:Content ID="content" contentplaceholder="cph" runat="Server">
<uc1:CustomControl ID="cc1" runat="server" CustomProperty="Hello World" />
</asp:Content>
CustomControl.ascx
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="CustomControl.ascx.cs"
Inherits="ApplicationName.Web.Controls.Custom.CustomControl" %>
<asp:PlaceHolder ID="ph1" runat="server></asp:PlaceHolder>
CustomControl.ascx.cs
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace ApplicationName.Web.Controls.Custom
{
public partial class CustomControl : System.Web.UI.UserControl
{
///My logic
}
}
Again it seems so easy. What am I missing? Or is this not possible?
Setting A Property For A User Custom Control?
Jan 25, 2010I have created a user custom control, and what I would like to do is to pass it the text value from a label where I can carry out some other processing.
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View 2 RepliesDatabind A Property On A Custom User Control?
Nov 29, 2010I have a custom user control UserProfileLink on which I have two basic string properties, UID and UserFullName which I would like to use in a template column in a DataGrid like this:
....
<ItemTemplate>
<td:UserProfileLink ID="uplUser" runat="server" UID="<%#Eval("UserUID") %>" UserFullName="<%#Eval("UserFullName") %>" />
</ItemTemplate>
....
I get an error saying "The server tag is not well formed" which leads me to believe this type of binding isn't possible. Is there a way to do this, or is it impossible?
How To Create Custom/User Control With Children
Jun 15, 2010I want a create a custom/user control that has children.
For Example, I want my control to have the following markup:
<div runat="server" id="div">
<label runat="server" id="label"></label>
<div class="field">
<!-- INSERT CHILDREN HERE -->
</div>
</div>
and when I want to use it on a page I simply:
<ctr:MyUserControl runat="server" ID="myControl">
<span>This is a child</span>
<div runat="server" id="myChild">And another <b>child</b>
</ctr:MyUserControl>
The child controls inside my user control will be inserted into my user control somewhere. What is the best way to accomplish this?
The functionality is similar to a asp:PlaceHolder but I want to add a couple more options as well as additional markup and the such. Also the child controls still need to be able to be accessed by the page. (in the example above the page should have the myChild Control on it)
EDIT ------
It can be a template control as long as it allows me to reference the children on the page.
AJAX :: Using Modalpopupextender Within A Custom User Control?
Jun 30, 2010I have a modalpopupextender inside a custom user control and when the user clicks on a imagebutton in the custom user control, this modalpopup has to be displayed to the user for inputs. The problem that I am facing is that nothhing is getting displyed even after clicking the image button.
i am using master pages and this custom user control is being added dynamically to one of the child pages. I have added the scriptmanager as a part of the child page rather than as a part of the user control because there are multiple custom user controls present in this page.
Lemme go to the code:
This is the snippet present in the custom user control:
[Code]....