Custom Server Controls :: Extending GridView: New Behavior DefaultValue Not Working?
Mar 1, 2010
I an expanding on the HotGridView control (http://msdn.microsoft.com/en-us/magazine/cc163612.aspx). During testing I noticed the "AutoGenerateCheckBoxColumn" behavior was returning true even if the user did not specify the a value in the markup but I expect it to return False if not value is supplied by the user - can anyone shed some light on why the AutoGenerateCheckBoxColumn is always true if not explicitly set to False in the markup?
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Mar 24, 2011
I'm trying to extend GridView control following these steps:Create a namespace in an empty Visual Basic file: mycontrols.vb
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Register it in the WebForm I want it to be
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Create the control in my WebForm:
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I get an error as tag prefix unknown, and in my code behind file, the control doesn't recognize the primitive GridView properties and methods.
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Mar 30, 2011
I'm trying to extend de GridView control with a Custom Server Control, I'm doing ok with extended properties but when I get to methods that need to re-apply or modifiy the DataSource I don't get any data in the grid, though the SQLDataSource actually retrieve data. Here is my MyGridView.applyFilter() method, which should filter the data but actually shows an empty GridView, but as I sayed, the DataSource has data. I try to find (FindControl) theSQLDataSource of the GridView (Me) and modifiy its paramters, thenDataBind Me to apply the changes...
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What am I doing wrong? why is the gridview empty?
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Feb 23, 2011
I'm trying to extend the GridView into a custom/user control "WorklistGridView". And I'm not quite sure how to do it... so here's what I need:Every row needs to have a control (either a boundfield or a templatefield with a label, etc.) that contains the StepID (which is a column returned in the data set).I want to be able to use the WorklistGridView as a base class and extend it to something like "XyzWorklistGridView", where that child class would have a few more controls in the row template.
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Oct 3, 2010
I would like to know why somethimes DefaultValue in properties window is displayed in bold text and somethimes in normal weight text? What i know is that the Value in Properties Window should display bold only if the Value is different than DefaultValue.
So i have a situation, where i need to set DefaultValue's and i'm successfully setting the boolean Value but failing in Integer value...
aspx:
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Now the reason why i'm using Int32 in this example is that i hovered the mouse over the DefaultValue and it's said that "represents a 32-bit signed integer" but still no luck.
Why is my StepHour displayed bold and how to display this DefaultValue in regular weight text?
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Nov 24, 2010
I've created loads of user controls, but this is my first time dealing with extending a server control. The problem I'm getting is that the base control's data is not being persisted across postbacks in a Master/Content page.I'm actually trying to get this working using a Telerik control (for my sins), but the same issue happens with a standard Web TextBox control. Code:
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Now, I've copied the way I handle the control state as I do it with user controls (ControlState), and it isn't working. Can someone point me in the right direction please? All the examples I find refer to creating user controls, not extending existing controls. Specifically why nothing is being persisted on post back.
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Dec 16, 2010
This is my first "request for help" post - I've spent the past few weeks helping others, so I'm hoping someone can shed some light here.I've dealt with server controls before, so it's not new to me, but it was some time ago and I'm a bit rusty. I have an inherited calendar control, that works fine:
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I've overriden the Render method, hoping to be able to modify the HTML output of the control - I want to hide the back arrow if the Month & Year in MinDate is reached in the calendar, and the same goes for MaxDate and the forward arrow.On top of this, I want to be able to display icons in the day cells, under certain data-bound conditions. Once I've figured one out, I'm sure I'll be able to work the other one out.Are there any other methods, events or properties more suitable for this? Are there any other controls that do what I'm looking for that I've maybe overlooked?I'm using C#.Net 4.0 Webforms - it's a very small app, so I've not used MVC etc... just a few LINQ queries to the database.
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Dec 2, 2010
Header controls like create ,delete are created by using templated user controls (ITemplate) .
The controls are working in all pages except the last page when paging is enabled in grid view.
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Sep 3, 2010
Iam developing a custom checkbox control deriving from the 'compositecontrol' which i need to use it for a composite control purpose.
public
class
TngCheckBox :
CompositeControl
{
i have written the required properties which are working fine except the "checked" property. here is my code for 'checked' property. i tried both the below ways (commented one and not commneted) . the problem is the 'checked' value is not setting the value at the get set part of the property.its assigning the value at the design time , but when i check and uncheck its not updating the property value.which is resulting me wrong .
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Oct 15, 2010
Iam developing a custom checkbox control deriving from the 'compositecontrol' which i need to use it for a composite control purpose.
public
class
TngCheckBox :
CompositeControl
{
i have written the required properties which are working fine except the "checked" property. here is my code for 'checked' property. i tried both the below ways (commented one and not commneted) . the problem is the 'checked' value is not setting the value at the get set part of the property.its assigning the value at the design time , but when i check and uncheck its not updating the property value.which is resulting me wrong .
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Jan 13, 2010
When I implement Custom web control inheriting ASP.NET Menu Ajax is not working. I try to Override Render method and generate Li's rather than table.I try to use Control Adapters, but when I am not using adapters for some pages ithe base adapter is generating just hyperlinks with span. I do not want this way. So I can not use these.
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Mar 16, 2010
Using VS2005, VB code behind, Using Customer Pager Template, in a custom GridView...
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Aug 18, 2010
i've created a webform with one gridview having connected with the database using datasource. i.e password database with three colomn .
now want to insert the custom dropdown button using server control for each column.
when i select the dropdown list the list should display the value as required.
e.g if i click the uname dropdownlist then it should show the list of names.
if i click on pwd dropdownlist then it should show the list of numbers.
if i select any one of the value in the dropdown list then it should insert into the
database.
can i get code on this type of question...?
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Dec 21, 2010
I have a radgrid with multiple filters including DateTimePicker for From DateTime To DateTime.
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Jun 18, 2010
while i was using flash movie on my application nobody was able to watch it . However I know the reason that is flash plugin should be installed on client side. So here i want to deploy a msg or utility to install a flash plugin as:
there should be a button having text install flash plugin now and on clicking it setup should execute on client side so that it will run setup and every body will be able to watch it.
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Dec 9, 2010
I were following the tutorial at this page of how to build my own view engine: [URL] And in hope of just extending the existing RazorViewEngine I made some changes to the code in the tutorial...
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The thing is that now when I run my site..I get the following error: CS0246: The type or namespace name 'WebMatrix' could not be found (are you missing a using directive or an assembly reference?) and I just cant find a way to solve this..I have added the references.
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Mar 5, 2010
Why custom Gridview control not render html properlies under <Columns> properly in Visual Studio 2005?
For example:
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May 19, 2010
I have existing project written by someone else that utilizes custom User Control that among other things contains a GridView control.I'm working on implementing the bulk-edit function so that users can modify data in many rows at once and then update the database accordingly.My problem is that in all examples that I see in order to implement this functionality you need to Override the CreateRow method, at which point you are able to put it in Edit State. The issue is that since my custom control inherits from User Control and not from GridView this protected method is not available. If I change the inheritance to GridView, tons of other things break inside this code, so I'd like to avoid that.My question is, is there anyway to still override the CreateRow if I'm inheriting from UserControl class and not GridView.If this is not very clear, please let me know and I'll try to explain further. I really need help with this, as it is time sensitive and it's always hard to work with someone elses code,
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Jan 16, 2010
I have build a composite control containing a Label, TextBox and a ImageButton. The idea:
Label text | textbox | imagebutton used for triggering an event
This textbox has a build-in validation.
When the imagebutton is set, i will use this imagebutton as a trigger. This imagebutton has an onclick event. Nou my problem is the following:
When i have my textbox on a form an click a button to validate my textbox validation takes place correctly.
If my textbox has the imagebutton enabled and i click this imagebutton validation takes place.
In my composite control i have implicity set imagebutton.CausesValidation = false;
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Feb 16, 2010
What are the advantages of extending HtmlHelper instead of creating a Custom Class.
f.e. <%= Html.Table(data) %> vs <%= CustomClass.Table(data) %>
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Oct 20, 2010
I have custom gridview that inherit from the regular gridview.
On of the features is that is has a built in page size dropdown in an extra header row.
Another feature is that this extra header row has a place holder where aditional controls can be added but here is where I have some problems.
When I add a control that is created outside the gridview to the gridviews builtin placeholder and tries to do anything that performs a postback the gridview dissepears, but appears again on a new post back.
Here is the code for the gridview:
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And this is the way it is used in a usercontrol on page, the gridview is called gvList and the control that I try to add to its placeholder is the phrExtraHeaderControls:
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What can be wrong, is the viewstate messed up in the postback so that the gridview can't be rendered?
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Jun 18, 2010
I have a user control SearchCriteriaCtrlr.ascx(see below).In this user control, I have a javascript code for filtering listbox values.I am firing this javascript for
<asp:TextBox ID="txtSearch" runat="server" onkeyup="FilterItems(this.value)"></asp:TextBox>
Problem:The problem is, my filter javascript is not working
SearchCriteriaCtrlr.ascx
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="SearchCriteriaCtrlr.ascx.cs"
Inherits="TimecardAdmin.SearchCriteriaCtrlr" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajaxToolkit" %>
<link href="Styles/Site.css" rel="stylesheet" type="text/css" />
<script type="text/javascript">
//variables for holding different values
var ddlText, ddlValue, ddl, lblMesg;
function CacheItems()
{
//Array for holding Text
ddlText = new Array();
//Array for holding Value
ddlValue = new Array();
//Listbox value
ddl = document.getElementById("<%=lstSource.ClientID %>");
//Looping through all values of listbox
for (var i = 0; i < ddl.options.length; i++)
{
ddlText[ddlText.length] = ddl.options[i].text;
ddlValue[ddlValue.length] = ddl.options[i].value;
}
}
window.onload = CacheItems;
//function for filtering items
function FilterItems(value)
{
ddl.options.length = 0;.....................
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Oct 20, 2010
Iam developing a custom server control of radiobuttton. it is working fine with the all the properties i wrapped except the grouping . somehow the grouping is not working .
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Apr 21, 2010
When I am using one of the default validation attributes, like [Requeried], and try to submit the form that is in an invalid state some 'magical' happens and the submit is canceled. I can even click 100x that not a single server request is made.On the other hand, I can't accomplish this behavior when I am using a custom validation attribute. Although my form was in an invalid state, a request is sent to the server anyway.I took a look at the "MicrosoftAjax.js" and "MicrosoftMvcValidation.js" but I am totally noob when it comes to Javascript.How can I accomplish the same behavior for both custom and default validations
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Jan 3, 2011
Is there a way I can override the default scrolling using when SetFocusOnError = true? Right now it pops the user up the page so that the top of the control is at (0,0). The problem is that our labels are above the controls, so the user can't see the label without scrolling up a little more. I'd like to make it center the control vertically instead, and ideally even do a nice smooth jQuery slide up. I tried like this but it didn't work (never gets fired):
function WebForm_AutoFocus(obj) {
elem = document.getElementById(obj).scrollTop() - 200; //Go to 200px above where the element is
$('html, body').animate({ scrollTop: elem }, 350)
}
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