C# - Control Accessing Event Handler In Web Form Class?
Mar 11, 2010
I have a Custom WebControl. Inside this control I add a button and I want it to access an EventHandler that is on the WebForm where the control is included. The handler handles with controls from the WebForm, so it has to be there. I could probably manage to take the button out of the control, but it would be better to keep it on the control, for organization sake.
public class LanguageSelection : WebControl
{
private List<Language> _Languages;
private CSSImageButton btnOk = new CSSImageButton();
I then have an IHttpModule that gets called for every request:
[code].....
And now it's broken again! So to make a long story short, just by accessing the Form collection on the request in the IHttpModule, I somehow screw up the PostBack, and the event never gets fired.
I have a button on a masterpage, which when clicked, calls a method that takes an EventHandler previously saved to the viewstate, this method is on the client page, and executes it:
However, the value of TextBox2 is incorrect, it is the value of the text box that was set when the page loaded (or if any other item on the pages changes it), the new value is not passed.
If I add a button to the client page, that calls the Button2_Click event directly, it get's the correct value.
Is the reason I am not getting the correct value of the text box because the Event is called from the master page?
I should add, that this button is created dynamically, and the event delegate will vary, which is why I have to set it at run time. I need a way to set the delegate on a click, and persist this until it is changed again.
I have this method that I'm currently putting in each page I make, I know there should be a good way to move it to a single place for ease of maintenance and simplicity. I'm just not sure how I should handle the event handler. The event handler needs to be on each page, so how would I pass in a reference to the page properly so I can reference the event handler?
I have a static class (an helper class) which has the responsability to create control and add them to a panel passed by parameter, this method is used by a lot of
I understand I need to load my dynmaic control on every postback and preferrably in Page_Init(). But my dyanmic controls are loaded from a dropdownlist selectedindexchanged event handler. Now after any postback, my dynamic controls are gone. How would I force it to load on every postback ?
I am building a web site with visual web developer 2010
I have a class (autoButton) that adds a button to a panel (on Default.aspx) and a handler w/i the same class (classifyEventHandler)
The button appears fine, but when clicked the even doesnt fire, what am I doing wrong?
I tried locating the event handler in default.aspx, but it was not found :P
Imports Microsoft.VisualBasic Public Class autoButton Public Sub makeClassifyButton(ByVal theCell As Object) Dim myButton As New Button myButton.Text = "classify" myButton.ID = "b_classify_" + theCell.ID AddHandler myButton.Click, AddressOf classifyEventHandler theCell.Controls.Add(myButton) End Sub Private Sub classifyEventHandler(ByVal sender As Object, ByVal e As EventArgs) MsgBox("done?!") End Sub End Class
I have a page books.aspx that has a control named authors.ascx.
Inside the authors control there is a "select" button I want to add some kind of listener or event handler (not sure of the correct terminology) so on the parent page (books.aspx) I can respond to the "select" button being clicked.
I have to pass the authorID from the user control to the parent page.
In my authors.ascx control I just created this event:
[Code]....
Now I need to write the function for SelectAuthorBtnClick and I think add some kind of listener in the parent page to listen and handle the event.
Is there a technical reason for the existence of Page.PreLoad or is this just convenience to have a place where you can neatly place code that always have to be executed before the Load code? Is there a difference between adding code in the PreLoad event handler and adding code at the top of the Load event handler? And what would be a typical scenario where you use PreLoad?
i friends i am having two forms say form a and formb and having two panels in formb and i want to show this panels from forma based on some condition and the code which i am using is
Dim capfrmobj As New CaptureForm capfrmobj.panelvf.Visible = True capfrmobj.pnlc.Visible = False capfrmobj.pnlnc.Visible = False
I am creating a web control by addin the html in the code behind, like this:
Code: Dim sb As New StringBuilder Dim myDiv As HtmlGenericControl = Me.theContainer sb.Append("<table width='100%' cellpadding='0' cellspacing='0' style='border:0px;'>" & vbCrLf) sb.Append(" <tr class='mainRow1'>" & vbCrLf) sb.Append("<td align='left' style='border:0px solid white;'>Main Menu</td>" & vbCrLf)
[Code] ....
This will generate the html for the table in the codebehind then inject it into the specified DIV element. My question is, if I create a control in this manner, how do i add an event that will fire a method in my codebehind? For example, if i want to create a image button i would do it this way in the code:
Code:
<asp:ImageButton CommandArgument='<%# (Container.DataItem.objectValue) %>' ID='ImageButton1' runat='server' OnCommand='Button1_Click' ImageUrl='~/images/folder.gif' /> but in the code behind i would do this:
i try to create dynamic control and have a single event handler to ease the fireevent how do i do it?also can i declare a single event handler to parent control and be use by child control of the same type
in example:
creating htmlanchor name aa aa.Control.Add(any anchor) after adding the control declare the event handler
Currently have Main.MasterPage, a MyNewPage.aspx (with master page file) and a use control with buttons. Should I load the events in the MyNewPage.aspx during the Page_load or during the InitializeComponent() ?
I have a web page where I'm dynamically loading one of a series of user controls. In each user control I call a general-purpose event to inform the web page that data on the user control has changed and/or new data is available. On the user control I define the Event Handler like this: public override event EventHandler DataOut_Handler; and then I force the event to occur like this:
DataOut_Handler(sender, e); On the web page I reload the previously loaded user control and wire up the event handler like this: protected void Page_Init(object sender, EventArgs e) { DataEntryUserControlBase userControl = (DataEntryUserControlBase)LoadUserControl(); if (userControl != null) userControl.DataOut_Handler += new EventHandler(UserControl_DataOut_Handler); }
Note: It's "DataEntryUserControlBase" rather than "UserControl" because I constructed an intermediary base class to making casting simpler. Everything seems to work fine but I do have a question: When I step through my code, after the last line in Page_Init is executed I move the mouse cursor over top of userControl.DataOut_Handler but it reads null. The code is working fine but I'm most curious why I don't see any object associated with that item immediately after wiring up the event handler?
I have a control which has an ImageButton which is tied to an OnClick event... Upon clicking this control, a postback is performed and the event handler is not called. AutoEventWireup is set to true, and I've double checked spelling etc.... We haven't touched this control in over a year and it has been working fine until a couple of weeks ago.
We have made changes to controls which load this control... so I'm wondering, what kind of changes could we have made to stop this event handler from being called? There is quite a bit of Javascript going on, so this could be the culprit too...
If I run the loadLinkButton function inside Page_Load everything is ok. But when I try to run the loadLinkButton by clicking simple button, link button is created but event is not handled.
I have got most of this code online, which does not quite work, can something like this be done to produce a button click event to indicate that a built in button on the datapager control has been pressed ?
DataPager Pager1 = ListView1.FindControl("DataPager1") as DataPager;
{ foreach (Control cPagerControls in Pager1.Controls) { if (cPagerControls is Button) { Button OnClick = cPagerControls as Button; OnClick += new EventHandler(OnClickMethod()); } } }
i have to write this piece of code in almost 10 to 15 content pages. i am just wondering if i can class file as base class for my content pages and write this piece of code in that class.
[Code]....
can somebody guide me how to write the base class for this scenario?
I have a master page, sub master page and content page. The master page has a form control which both masters can access by name alone:
Code: <form id="form1" runat="server">
The content page contains a contact form, with the form tags removed as they conflict with the form tags on the master.
What I want to do now is access form1 on the content page so I can change its properties for use in the contact form. I'm not sure if this is how its done in ASP? Anyway, here's how I've tried to:
Code: Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load Dim f As Control = CType(Master.FindControl("form1"), Control) f.Action = Request.Url.ToString() f.Name = "contactForm" f.Method = IsPostBack End Sub
I've created a UserControl that is dynamically placed onto my page during the Init event. It populates and works great, but I'm left scratching my head at how to retrieve data from it during a postback.
It's effectively a multipick combobox that is manipulated entirely using clientside JavaScript (I'm using jQuery heavily). Inside the control container element, I render an empty DIV element that contains all of the selected items. As the user selects items, I generate DIVs within that container DIV that includes some markup. Of interest to me on the server side are the contents of a couple of INPUT fields.
After selecting an item, the rendered HTML looks something like:
[code]....
I may be completely off track and this may actually be impossible (or a stupid idea). The only alternative I can think of is to emit actual ASP.NET controls and hook the built-in event handlers.
I have a dropdownlist in a user control and i want to perform different functions on the basis of the host page that hosts this user control when the selected index of the dropdownlist changes e.g. when the host page is locations i want the event to load locations for the selected item in the dropdown, when the hosting page is services i want to load services for the selected item in the dropdown. What is the best possible way to achieve this scenario.
I have created a web user control called Activity. I have defined a public-facing event on that web user control called OnActivityDelete. There is a delete button in the Activity control. When the delete button is clicked, the Activity control fires the OnActivityDelete event. I am using this web user control in a repeater. I assign an event handler to the OnActivityDelete event on the repeater's item data bound event. When I click the delete button for the Activity control, the event fires from the Activity control, but it never hits the event handler in the page that's using the control. (I have stepped into the code with the debugger and confirmed this behavior).
My suspicion is that this behavior has something to do with the fact that the event handlers are added in code behind when I bind the repeater to a datasource, which I only do if the page is not posting back.Is it possible to define the event handler for the Activity control in the markup of the aspx page? If so, will this solve my problem?If not, do I have to bind the repeater and hook up to the events every page load in order to solve my problem (this works, I just tested it), or is there some viewstate trick to getting the events to persist? Markup of Repeater on page:
