Event Handling - How To Wire Up A Custom C# WebControl To Post Back A Custom __EVENTARGUMENT
Dec 16, 2010
I'm creating a custom ASP.Net GridView and I want to be able to alter the __EVENTARGUMENT value but I can't figure out how to capture the returned value on the server side.
I'm creating the ability to have a collapsible representation, so the first level is the standard GridView and I will insert additional rows via JavaScript if they expand the first level row.
My problem is how to create a link on the selecond level rows that posts back with custom data.
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Nov 16, 2010
I built a webcontrol showing a complex user interface with a lot of javascript. Basically my webcontrol is similar to : [URL]
Now that most the user interface is working properly, I'm stuck with the following issue: I want to add a button (html button tag) which has to trigger an event. I have been able to declare the event, the event args, the delegate,etc. The page using my control may assign a handler and that handler is called correctly when I explicitely call OnServerControlClick (The name I gave to the event). I cannot make the link between the button in the user interface and the event in the webcontrol source code. When the button is clicked, I get an error message saying a dangerous Request.Form value has been detected.
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Mar 8, 2010
I am trying out some code which enables me in creating a page with extension .asp2
The tags included will also be custom, something like:
[code]....
I have done the necessary changes so that ASP.NET identifies the extension. I have also kept a mapping of custom tags and asp.net/html tags with myself. With this I am able to render the page on browser. But how can we do event handling(usually done by page postbacks and code) in such a scenario?
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Feb 18, 2010
How insert a drop list property into a custom webcontrol? This a drop list property is show all textbox control on usercontrol or webpage.
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Nov 29, 2010
I am creating a custom control by inheriting a server control, say LinkButton. There are properties like "BorderColor" available in LinkButton. Let's say, I don't want this particular property to be available when I create an instance of the custom control.
I want to completely hide this particular property (I don't want to override it but disable it.)
My code is as follows:
[Code]....
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Apr 6, 2010
For test purposes I have created a simple button control that extends CompositeControl. I am able to place it on the page with a <asp:Content... and the Click event Bubbles without problem from the Control.
Now, here is the problem I am facing Due to design requirement I need to read the assembly and the classname from a table and dynamically create the control and add it to the <asp:Content. And when I do that the click event will not fire! Where am I going wrong.
Here is the code in the ButtonControl.cs
namespace Reports.Web.ServerControls {
[DefaultProperty("Text")]
[ToolboxData("<{0}:ButtonControl runat=server></{0}:ButtonControl>")]
public class ButtonControl : CompositeControl {
protected override void CreateChildControls() {
Button btn = new Button();
[Code]....
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Jan 4, 2010
I have a custom control which contains (amongst other things) an imageButton.
I'm adding a handler to the "click" event of the imageButton however when the button is clicked the handler routine is not called. where I am going wrong with this? should I be handling the click event in some other way?
here is my code:
[code]....
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Mar 6, 2010
i have a server control that include more of one controlcan i set post back control that have't same name or id with control(span)
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Jun 24, 2010
I am creating a webform in which I am having two radio buttons (Yes/No), one textbox, and two lables.
I want to enable and disable the textbox on radio button click Yes and No respectively.
I want to use custom server control for this whole process as we have to use this DLL in other application also.
Being as beginner I got just confused about event handling methods for server controls.
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Apr 4, 2011
I have a custom server control (composite control having dynamically created dropdown boxes and textboxes). I have enabled AJAX in order to avoid page reload.The server control is used inside the ASP.NET webcontrol having few buttons which controls the visibility of the server control. Now I enter values in the dropdown box and texboxes and click on any other button. After this postback the last entered values are gone! The control is not remembering the values. How can I retain the values after post back?
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Jul 29, 2010
I have a custom ascx user control on my page that includes a dropdownlist. There is an onSelectedIndexChanged event handler that is connected to this dropdownlist. The first time the user selects a value, the page does a postback and the logic executes correctly. However, if the user then goes to change their selection, the event handler does not get triggered.
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Jan 10, 2011
I have a parent control that has an instance of a HiddenField child control. I am using CreateChildControls() to add it. Everything works client side including the values being added to the field. However, on postback, the reference to the field is null
here is the code
[code]....
I have tried simply relying on the ViewState ... then also attempted using FindControl(). Neither works, it comes up as a null reference ... any input on what is going here?
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Mar 23, 2010
What I'm trying to do is rather basic, but I might have my facts mixed up. I have a details page that has a custom class as it's Model. The custom class uses 2 custom objects with yet another custom object a property of one of the 2. The details page outputs a fair amount of information, but allows the user to post a comment. When the user clicks the post button, the page gets posted to a Details action that looks something like this:
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult Details(VideoDetailModel vidAndComment) { ....}
[Code]....
The only fields on the form that is posted are CommentText and VideoId. Here is what the VideoDetailModel looks like.
public class VideoDetailModel
{
public VideoDetailModel()
{
[Code]....
I suppose if I added more form fields for the properties I need, they would get posted, but I only need 1 form entry field for the CommentText. If I could get the same Model objects value that were sent to the page to post with the page, it looks like the solution is rather simple. I think using the RenderPartial in the middle of a form is problematic somehow to how the form gets written in html. I can't really put my finger on why things went bonkers, but if I do my RenderPartials before my form and then begin my form with the text entry field and the hidden VideoId, the default ModelBinder works just fine. I was beginning the form, writing the hidden VideoId, rendering several partial views, create my CommentText field, and then closed the form out. The CommentText field would get bound just fine. The hidden VideoId would not. Maybe I missed a rule somewhere about using RenderPartial.
For completeness, the partial view I was rendering took a Comment object and just wrote out it's CommentText data. Several of these objects would exist for a single Video object. All of this data was in a custom type and passed into the View (the main view) as it's Model. This partial view did not have a form and did not have any data entry fields.
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Mar 23, 2010
I have a page which holds a custom webcontrol and a usercontrol. I need to reference of webcontrol in usercontrol class. So, I make the declaration of webcontrol as public in page class. But, when I do "this.Page.", I don't see the webcontrol listed in list provided by intellisense. Most probably, I am missing something.
In an asp.net page, how to get a reference of a custom webcontrol from a usercontrol?
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Jan 25, 2010
I have created a custom web control to act as a button with an image. I would like to be able to set this as the target of the DefaultButton parameter of an ASP.NET Panel control. I have implemented the IButton interface, and no error is generated when loading the page using the control. However, when I press enter in a textbox within that panel, the Click event of the control is not raised. When I replace my control with a standard ASP.NET button, everything works fine.I have a test page with a panel containing a textbox, an instance of my custom button, and a standard asp.net button. The buttons are wired to an event handler which will change the textbox to the ID of the caller.When DefaultButton of the panel is set to the ASP.NET button, hitting enter in the next box works correctly - the page posts back, and the text box is populated with the name of the standard button. When DefaultButton of the panel is set to my button, hitting enter in the textbox causes the page to postback, but the Click event is not fired. Clicking the button manually works correctly.Does anyone know what I have to add to my custom control to make it handle the event coming from the Panel control? I'm looking using Reflector at the source code for Button, but cannot identify what is enabling this behaviour.I have posted the source of the control below, and the relevant source of the test page.Control Source:
public class NewButton : WebControl, IPostBackEventHandler, IButtonControl
{
public NewButton() : base(HtmlTextWriterTag.A) { }
[code]...
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Jul 29, 2010
I have a custom ascx user control on my page that includes a dropdownlist. There is an nSelectedIndexChanged event handler that is connected to this dropdownlist. The first time the user selects a value, the page does a postback and the logic executes correctly. However, if the user then goes to change their selection, the event handler does not get triggered.
View 2 Replies
Mar 24, 2010
I have a page which holds a custom webcontrol and a usercontrol. I need to reference of webcontrol in usercontrol class. So, I make the declaration of webcontrol as public in page class. But, when I do "this.Page.", I don't see the webcontrol listed in list provided by intellisense. Most probably, I am missing something.
In an asp.net page, how to get a reference of a custom webcontrol from a usercontrol?
View 4 Replies
Jan 18, 2011
I created this simple custom web control:
[Code]....
I used this control on my page:
[Code]....
The problem is that when page is displayed in web browser is see default back color, font and border, values from page are not applied on the my control. Why?
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Aug 28, 2010
I have a base server control class for all my user controls. Inside this class I have the following declaration:
[Code]....
Concrete user controls used in the application are used always inside a ModalPopupExtender object and the popup it is always handled with server-side code. This means that there are no controls binded to the OkControlID and CancelControlID properties of the ModalPopupExtender.
The responsibility to show the Modal Popup is then given to the aspx that has code like this in the ASPX file...
[Code]....
To hide the modal Popup the aspx just implement the event handler
[Code]....
Last, the event firing is responsibility of the concrete UserControl class that can use any way to do it's work and then fire teh event. This is done through this code:
[Code]....
The problem I am facing to is that in the OnItemSaved of the super class the ItemSaved EventHandler is always null and so the event it's never fired on the aspx page. Where am I doing wrong?
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Apr 5, 2010
I come from the Windows forms side and started using ASP.NET. I have not found how to use event handlers properly.Basically I want to create a shopping cart web control. When a purchase has been made I want to raise an event with products in the purchase. I would like to have the shared/static event and delegate on the web control and then, maybe in Global.asax (if not possible elsewhere) handle that event.
How can I do this? It seems I cannot access objects from other pages/controls.
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Feb 23, 2010
I am writing a custom composite WebControl and want to expose styles of child controls it encapsulates to the ASP.NET designer. The code I currently have is similar to the skeleton below (which for simplicity only has one child control).
With the code below, I can see property "ChildPanelStyle" in the designer, but when I try to modify one of the properties (e.g. CssClass) in the designer, it immediately resets itself to its default value. It looks like the designer serialization isn't happening.
What am I doing wrong?
UPDATE
I've updated the sample with an additional style property that is managed directly by the custom control, rather than simply being the property of a child control.
The HeaderStyle property is persisted properly by the designer, but the ChildPanelStyle property isn't.
Of course I could manage all my styles like HeaderStyle, and apply them during rendering, but I'm hoping there's a simpler solution whereby child controls can take care of themselves, and I don't need any custom rendering.
[code]....
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Aug 8, 2010
In the logout link button click event I have cleared the session variables.I am checking these session variables for null values at each page's load event.If it has the null value redirecting them to the login page.But the problem is whenever I click the browser back button,the page_load event won't get called.For that I have cleared the the browser cache history.
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Aug 25, 2010
I am using an image button and on click of it i want to go to visited page.
Now i am using - Response.Redirect(Request.UrlReferrer.ToString()),
It is going to previous page, but when i am in a page of some user details where the link is looks like - users.aspx?userid=25 and i visit some other page and click back(image button) i want to see the same serdetail page. How to track that.
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Jul 27, 2010
In ASP.Net I have a few custom controls I've made. I utilized jQuery where it helped also. Well, one problem I have now(with obvious, but "bad" workarounds) is that for each user control I need to execute some code from within pageLoad($(document).ready will not work with update panels). Well so now my problem. I need to have two custom controls attach to the pageLoad event. What would be the best way of doing this? I can't just do
old_pageLoad=pageLoad
pageLoad=function(){... old_pageLoad();}
because these custom controls can be used more than once on a page and the script needs to run for every single instance of the control, plus what if I had 3 different custom controls on the page? the only method I've come up with is something like this which seems super hackish:
old_pageLoad_<%= MyStaticClass.GetUniqueID() %>=pageLoad;
pageLoad=function(){... old_pageLoad_<%= MyStaticClass.GetUniqueID() %>();}
Are there any better ways of handling function conflicts like this? I have also seen this MSDN article but what it suggests doing seems worse to me than what I am currently doing.
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Jan 13, 2010
I am trying to write a webservice that's going to be used through ASP.Net Ajax. In this webservice I have to add exception handling so that in case of any error, I could log them to some central place and then throw.
In my other areas of code (like aspx pages), i have been using a basepage which Overrides System.Web.UI.Page class's OnError by adding a custom event handler. I want to do the same for my webservice as well.
Basically I do not want to decorate each webservice method with a Try Catch block. Instead if there is a clean way like to override the on error method, i want to go for that. Unfortunately the WebService class does not seem to have any functionality for this.
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