Web Forms :: How To Use Delegate In User Control To Trigger Events
Mar 2, 2011
I have got a query regarding the usage of delegate in usercontrols. The scenario is I have got a user control which acts as a footer
on all the pages, It has the following place holders : Email, Print, Logout.
What I want to acheive here is when the customer logged in he/she has certain feauture's on the website for instance his/her personal diary,
dieting charts, birthday calender etc. I have figured out a way to create pdf's of each summary , what I am looking for is how to use the usercontrol
for instance when the customer clicks on the email place holder on certain page which is in the footer usercontrol, the following place holder should send
an email with the pdf file of that particular page attached to the customer. I came to know that delegate is the best way of doing it, but I cant find any specific tutorial on it.
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May 14, 2010
I was able to get a user control to use a method on the parent page. The problem is, the delegate causes the page to do two postbacks. Is there a way to fix this?
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Jan 6, 2011
In my application i have placed one label in the update panel and in triggers one textbox and one dropdownlist.
<asp:UpdatePanel ID="TestPanel" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:Label ID="lblTest" runat="server"></asp:Label>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="txtTest" EventName="TextChanged" />
<asp:AsyncPostBackTrigger ControlID="ddlTest" EventName="SelectedIndexChanged" />
</Triggers>
</asp:UpdatePanel>
In the textbox if i gave any wrong input then i am displaying the error message with label "lblTest".The error is displayed in the label sucessfully but when i am selecting the ddlTest dropdownlist the error message is disappeared.
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Jan 27, 2011
I have around 8 user controls on a page with a form in each of them. I have a dropdown list that allows you to select a form, with a selectedindexchanged event that hides the current form and shows the requested form.
There is some javascript that needs to fire when each form loads. Now, when you click on a form for the first time, the javascript fires as it should, but if you click the dropdown to change the form, then click back to a previous form, the javascript doesn't fire (because the user control is already loaded).
Is there anything I can do to trigger a postback, or reload/refresh the user control whenever an option is selected from the drop down?
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Jun 5, 2010
I need to trigger a postback or self refresh a user control from one of the functions in the same user control.
Problem is that I am setting the selected value of a dropdown control in this usercontrol but it does not actually show up until after a postback.
This I came to know after I found that the said drop down shows the current value only after I click on another button.
I need to do this on the server side in the function given below:
public void FillDropDown()
{
FillProgramList(select);
//if (Request.Cookies["prgname"] != null)
//{......
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Jan 22, 2010
I am having an issue with a user control that contains a dropdown and a validator. I created a property for the "CausesValidation" property on the dropdown and set it to false. And yet the dropdown is still triggering the validator. I am having issues with this elsewhere as well including on my ModalPopup.
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Dec 30, 2010
I have DropDownList inside User Cotrol and i use this User Cotrol in my asp Page , in my page i have method that take paramter string
now i want to access the the DropDownList SelectedIndexChange from my page to execute the method by passing the DropDownListSelectedValue
(when user selecte value in dropdown list ,when it post back i watn to excute the method depent on value of selecte value )
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Jul 29, 2010
Dear friends, i'm working on user controls and events inside user control doesn't work for me.. my development process stuck due to this.
User control has a gridview which has rowcommands.
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Nov 3, 2010
Render User Control with Events in html
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Jan 9, 2011
is there an easy way to update a user control from another user control? i have a input box and a submit button. the user inputs a code, hits sumbit and based on the code, points are applied to thier score (another user control). the points are applied to the score in the database but don't show up on the page display until i hit refresh. is there an easy way to update the control on submit?
protected void btn_Add_Coupon_Click(object sender, EventArgs e)
{
try
{
SqlDataSourceTEST.DataSourceMode = SqlDataSourceMode.DataReader;
IDataReader Reader = (IDataReader)SqlDataSourceTEST.Select(DataSourceSelectArguments.Empty);
if (Reader.Read())
{
int iPoints = 0;
iPoints = (int)Reader["Points"];
if (iPoints > 0)
{
Profile.TimesVisited = Profile.TimesVisited + iPoints;
lblcoup.Text = iPoints.ToString() + " have been added to your score!";
}
else
{
lblcoup.Text = "Coupon Code Not Valid";
}
}
Reader.Close();
Reader.Dispose();
}
catch (Exception ex)
{
}
}
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Oct 26, 2010
My main file is messages.aspx and i am loading a UC names message_inbox.ascx dynamically as:
SiteUserControls_Message_MessageInbox InboxUC = Page.Load("message_inbox.ascx") as
SiteUserControls_Message_MessageInbox
Now in my user control ("message_inbox.ascx") i have a various events which i am combining in one group event :
public void ForwardLinkButton_OnClick(object sender, EventArgs e)
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Jan 3, 2011
In an ASP.NET page I have added two user control with a dropdownlist each one. The selection of a dropdownlist should be changed the query to the second user control.What is the most efficient way to pass the selected value of dropdownlist to the second?I initially thought of creating a public event (public string OnClientSelectedIndexChanged) while the first user control and outsource through a public string SelectedValue the selected value of the second user control:
public string SelectedValue
{
get
{
[code]...
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Jun 4, 2010
I have a user control called ucTriStateButton. It raises an event when it is clicked, called TriStateButtonClicked. If I put this user control on a page, it works fine. Here is the declaration on the .aspx page:
[Code]....
When the button is clicked the method tsbTest_TriStateButtonClicked executes correctly.
The problem is when I put the user control in template field of a GridView.
[Code]....
There is no way to hook the event handler to the control in Page_Load because I cannot get a reference to tsbMorning. So I did it in the RowDataBound event handler of the GridView, where I also do a bunch of other row-specific stuff. Although this builds and runs, the event is never actually subscribed to and so never gets fired.
So the question is - how can I handle an event from many instances of the same user control within a GridView? I am calling the same bit of code regardless of which user control is actually clicked. I only need to know that one was clicked.
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Mar 23, 2010
I have a user control in a master page with two drop down lists. When the user selects an item out of either ddl, I want to load a specific user control inside an update panel on the content page. I can't figure out how to get the user control to trigger the update panel.
Master
<%@ Register src="toolbar.ascx" tagname="toolbar" tagprefix="uc1" %>
<head id="Head1" runat="server">
</head>
<body>
[Code]....
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Sep 19, 2010
I'm trying to make web form with two placeholders. Firs holder contains user control witch has list of buttons, each button opens different user control to second placeholder.
I get it to show user control in second placeholder but i can't get dynamically created user controls to fire events.
So how i can dynamically create working user control with button click?
Here is how i create those controls:
[Code]....
"field" is hidden field containing filename of user control to be created.
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Apr 5, 2010
I have an application where I want to send an email reminder for an appointment 24 hours prior to the event. Users would log in and insert appointments. I would think I would want a background thread running on the server that would regularly check the database (say every hour) and generate an email if there is an event is due within the next day. From what I have read it seems like a Web service might do this. I guess I have a few questions
1) am I on the right track - is this an application for web services
2) can anyone point me to a good resource which can help me create the web service I would need. I would prefer if it is in VB and not C#.
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Oct 31, 2010
I have UpdatePanel with GridView and i want register posback triger for index changing and asyncpostback for pagging and sorting.
When registering AsyncPostback (with event) and Postback in one control i have ASP event.
How go around this problem? , dynami register triggers mayby is a solution but i can`t unregister triger.
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Dec 1, 2010
I'm creating a web user control in asp.net using C# in which i can select a date from a calendar and display it in a textbox. when i select a date from the calender it has to be displayed in the textbox. now i need to set my own properties by which i can select datetime patterns in cs codefile. for example
usercontrol1.dd-mm-yyyy.
this is one example. now i want all the datetime patterns of "en-us". when i use that usercontrol in another page i want to set any of the properties(datetime patterns) to that control.
public partial class DateControl : System.Web.UI.UserControl
{
string dateformat;
public string Dateformat
{
[Code].....
i said that i want set properties for my user control and create events for that..
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Jan 6, 2011
've recently set up an ASP.net site (not using MVC.net) to use URL Routing (more on the code below) - when using user controls on the site (i.e I've created a "menu" user control to hold menu information) the page_load event for that control will fire twice when URLs have more than one variable passed over.
i.e.
pageName/VAR1 : will only fire the page_load event once.
while
pageName/VAR1/VAR2 : will fire the page_load event twice.
*Multiple extra VARs added on the end will still only fire the page_load event twice*.
Below are the code snippits from the files, the first is the MapPageRoute, located in the Global.asax :
[code]....
Note, that when I'm just hitting the page and it uses the default values for items, the reloads do not happen.
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Aug 28, 2010
I have a user control in an asp.net web application. The control outputs an html list that is customized based on the currently logged in user. The list items are generated from a database look up and the user control is formatted to appear as a drop down list in the page.
The control itself is simple and looks like this:
<%@ Control Language="VB" AutoEventWireup="false" CodeFile="item-lector.ascx.vb" Inherits="includes_usercontrols_item_selector" %>
<!--Item Selector-->
<div id="item-selector">
<%=Me.Output%>
</div>
The code behind file dynamically fills the control's "output" property so the final markup appears as follows:
<div id="item-selector">
<h1>Item 1 - Item 1</h1>
<a href="#" class="changeItem itemArrow">Change item</a>
<ul id="changeItemMenu" class="dropDownMenu">
<li><a href="#">Item 1</a></li>
<li><a href="#">Item 2</a></li>
<li><a href="#">Item 3</a></li>
<li><a href="#">Item 4</a></li>
<li><a href="#">Item 5</a></li>
<li><a href="#">Item 6</a></li>
<li><a href="#">Item 7</a></li>
<li><a href="#">Item 8</a></li>
<li><a href="#">Item 9</a></li>
<li><a href="#">Item 10</a></li>
</ul>
</div>
The ID and class properties are all necessary for formatting and other scripting. The control is meant to be used as a selector and the rest of the page should react to which item the user selects.
What I am trying to do is add click events to the list items. When the user clicks on one of the items in the list, I want to capture which item the user selects in the list (does this require a postback?) and do something with it in the code behind (< this is key).
I am more of a middle tier and db tier developer and UI development is not my strength so please consider me a newbie in that regard. I am not sure how to proceed or what to inject into the output string to enable this.
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Jan 18, 2010
I have created a custom composite control basically with two checkboxes. I have created a subscribable event, and the consumer has subscribes to it. But when I go to excute it, the delegate reference is null. What am I missing and why is it losing its subscribed events?
[Code]....
I am using VS2008 SP1 targeting .Net 2/3.5SP1 web site.
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Oct 28, 2010
I have an aspx webpage in which an user control is added dynamically as follows:
UserControl testUsrControl = LoadControl("TestUsrControl") as UserControl;
testUsrControl.ID ="test";
Then I tried adding an event handler of user control inside aspx like below:
testUsrControl.Drpdatafield_SelectIndexChanged += new EventHandler(this.Drpdatafield_SelectIndexChanged);
But this line is giving error at **testUsrControl.Drpdatafield_SelectIndexChanged **. The error is "Drpdatafield_SelectIndexChanged" doesn't exist in UserControl.How can get the testUsrControl's events inside aspx page dynamically.
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Feb 23, 2010
I have user control that inherits a base control class and these user controls are loaded using the LoadControl method, I can't seem to figure out how to raise events from user controls to the page that are dynamically loaded this way. Here is the delegate and event in the base user control class.
public delegate void SomeChangeEventHandler(object sender
, SomeChangeEventArgs e);
public event SomeChangeEventHandler SomeChangeEvent;
public virtual void OnSomeChanged(SomeChangeEventArgs e)
{
if (SomeChangeEvent != null)
{
SomeChangeEvent(this, e);
}
}
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Aug 3, 2010
I have an update panel on the parent page into which I load and remove a set of user controls.
Now, when a button is pressed on the user control, the events are fired but there are no changes in the page. For example:
Main Page
<updatePanelMain>
<childcontrol1>
<childcontrol2>
etc
ChildControl.ascx
<update panel 1>
<panel1/>
<panel2/>
<btn1/>
etc
So, if I want to hide panel 1 when btn1 is clicked etc, I simple use code such as panel1.visible = false.
All this gets executed but nothing happens to the page.
<asp:UpdatePanel ChildrenAsTriggers="false" UpdateMode="Conditional" ID="updatePanel"
runat="server" EnableViewState="true">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnSubmit" EventName="Click" />
</Triggers>
<ContentTemplate>
However, when I use placeholders instead of update panels in the child controls, I dont face any such problems.
<asp:PlaceHolder ID="placeholderTypeOfInvestor" runat="server">
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May 23, 2010
I need to update datalist in image gallery when fileupload has been completed.
<div style="display: block;">
<div>
<div style="padding-left: 15px; padding-right: 15px;">
<div>
<uc1:ctrlFileUpload ID="ctrlFileUpload1" runat="server" />
<uc2:ctrlImageGallery ID="ctrlImageGallery1" runat="server" />
</div>
<div>
</div>
</div>
</div>
</div>
In the Control File Upload I need to fire the the other ctrl to refresh the page.
<asp:UpdatePanel ID="UpdatePanelUploadArea" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<span>
<asp:FileUpload ID="FileUpload1" runat="server" />
<br />
<asp:Button ID="UploadButton" runat="server" Text="Upload Now" OnClick="UploadButton_Click" />
<asp:Label ID="lblResult" runat="server" ForeColor="#0066FF"></asp:Label>
<br />
</span>
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="UploadButton" />
</Triggers>
</asp:UpdatePanel>...........
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