I've created an application in which I've created Dynamic Controls on Click Event of a Button. But the dynamically created Control Event will not Fire on Click of it.
Below is the Code I've written.
ImageButton closeImage = new ImageButton();
closeImage.ID = "ID"+ dr["ID"].ToString();
closeImage.AlternateText = "Delete";
closeImage.ImageUrl = "App_Themes/images/CloseButton.png";
closeImage.Attributes.Add("style", "float:right;cursor:pointer;margin: -19px 1px -10px;");
closeImage.EnableViewState = true;
closeImage.CommandName = "Delete";
closeImage.CommandArgument = dr["ID"].ToString();
closeImage.Attributes.Add("runat", "server");
closeImage.OnClientClick = "return confirm('Are you sure you want to remove this');";
closeImage.Click += new ImageClickEventHandler(this.closeImage_click);
protected void closeImage_click(object sender, ImageClickEventArgs e)
{
ImageButton ibDel = (ImageButton)sender;
}
The same code work if its placed on Page_Load(). Is there any other Solution to fire the event.
I would like to suggest that you read up on the following article on MSDN. It's about page lifecycle.The key part is to when controls are created. If the controls are created in the wrong stage, events will not be registered, and thus will not fire.
http://msdn.microsoft.com/en-us/library/ms178472%28v=vs.80%29.aspx
Related
When I click btnGDynamicCont I want to load the first set of controls, then on each further click of that button, add a new control (textbox) alongside the other ones, so each time it is clicked I am adding a new textbox across state.
Do you know where I should add the creation of the new textbox in order to keep it after each postback?
{
protected void Page_Load(object sender, EventArgs e)
{
if (Convert.ToString(ViewState["Generated"]) == "true")
GenerateDynamicControls();
}
public void GenerateDynamicControls()
{
TextBox txtDynamic = new TextBox();
txtDynamic.ID = "txtDynamic";
txtDynamic.Text = "Dynamic TextBox";
Page.Form.Controls.Add(txtDynamic);
TextBox txtDynamic2 = new TextBox();
txtDynamic2.ID = "txtDynamic2";
txtDynamic2.Text = "Dynamic Textbox";
Page.Form.Controls.Add(txtDynamic2);
}
protected void btnGDynamicCont_Click1(object sender, EventArgs e)
{
if (Convert.ToString(ViewState["Generated"]) != "true")
{
GenerateDynamicControls();
ViewState["Generated"] = "true";
}
else
{
Response.Write("<h2>Controls are already exist in page</h2>");
}
}
}
}
Dynamic controls are usually recreated at the Page_Load method. For more information, please refer to the Dynamically Created Controls in ASP.NET article.
You can refer the below link where a very similar issue is addressed.
unable to add more than one server control dynamically in asp.net
Everytime a postback happens, you should recreate the already existing controls(dynamically added) in your page_load event and the new controls are to be created in the button_click event.
Use some logic to generate ids for the controls for the viewstate to be maintained. VIEWSTATE will be taken care automatically if the ids of the controls generated before and after postback are the same.
One way to keep track of the number of textboxes is to store the count in session.
I'm trying to create a button dynamically on asp.net,but I can't add the event to it.What is wrong or missing below?
Thanks in advance
$
Button btn2 = new Button();
btn2.ID = "btnEdit";
btn2.Text = "Edit Member";
btn2.Click += new EventHandler(btnEdit_Click);
form1.Controls.Add(btn2);
I also tried like this:
$
Button btn2 = new Button();
btn2.ID = "btnEdit";
btn2.Text = "Edit Member";
btn2.Attributes.Add("OnClick","btnEdit_Click);
form1.Controls.Add(btn2);
read the article about the asp.net webforms life-cycle http://msdn.microsoft.com/en-us/library/ms178472.aspx. you have to create/recreate your controls everytime when loading the page (e.g. OnLoad-Method)
http://www.asp.net/web-forms/videos/aspnet-ajax/how-to-dynamically-add-controls-to-a-web-page
I think your trying to mix server side and client side events here.
The html attribute OnClick is a client side, when a user clicks on the button it fires a piece of JavaScript
The server event OnClick happens when a user clicks a button and it posts back to the server, which allows you to hook functions (server side) into that event.
Are you looking for server side or client side?
To add a client side event you can do
btn2.Attributes.Add("onclick","my_javascript_function");
To add a server side event you can do
btn2.Click += new System.EventHandler(this.MyMethod);
Where this.MyMethod is a method already seutp to handle the server side button click.
If I were right, you create buttons in Page_Load.
If it is check for postbacks.
if(!postback)
{
create your buttons.
}
Create a method for adding all Your dynamical controls as below
public void AddControls()
{
Button btn2 = new Button();
btn2.ID = "btnEdit";
btn2.Text = "Edit Member";
btn2.Click += new EventHandler(btnEdit_Click);
form1.Controls.Add(btn2);
}
and then call that method in Page_Load() Event & out side of the IsPostBack block as below
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
}
AddControls();
}
because for dynamically added control's view state will not load before Page_Load() evnt. go through this link for more info http://msdn.microsoft.com/en-us/library/vstudio/hbdfdyh7(v=vs.100).aspx
This should do the trick:
protected void Page_Load(object sender, EventArgs e)
{
Button b = new Button() { ID = "btnEdit", Text = "Edit Member" };
b.Click += (sd, ev) => {
// Do whatever you want to be done on click here.
Button me = (Button)sd; // This creates a self-reference to this button, so you can get info like button ID, caption... and use, like this:
me.Text = "Yay! You clicked me!";
};
form1.Controls.Add(b);
}
I am trying to create a dynamic ModalPopupExtender from code behind that when i click on a button it pops a panel with a button in side.
i created a panel (named panel) with a button in side called ButtonOk (button.id ="ButtonOk")
but when i click the event handler of the first button (Button_Click) nothing happens please help me my code is:
protected void Button_Click(object sender, EventArgs e)
{
HiddenField hf = new HiddenField();
hf.ID = "hdnField";
AjaxControlToolkit.ModalPopupExtender modalPop = new AjaxControlToolkit.ModalPopupExtender();
modalPop.ID = "ModalPopupExtenderSelectFilds";
modalPop.PopupControlID =Convert.ToString(Page.FindControl(Convert.ToString(panel.ClientID))); //panel.ID;
modalPop.TargetControlID = Convert.ToString(Page.FindControl(Convert.ToString(hf.ClientID))); //"hdnField";
modalPop.OkControlID = "ButtonOk";
modalPop.BackgroundCssClass = "modalBackground";
modalPop.BehaviorID = "modalPopupExtenderSelectFilds";
modalPop.Show();
}
For help of other users, you will just have to add modalPop to area where control will be added to page
For example, this should be added at end of code
panel1.Controls.Add(modalPop);
check this code to add controls to panel:-
this.panel1.Controls.Add(modalPop);
In code behind, you can make this:
if (true)
{
var script = #"Sys.Application.add_load(function() { $find('behavoirIDModal').show(); });";
ScriptManager.RegisterStartupScript(this, GetType(), "ShowPopup", script, true);
}
edit this: behavoirIDModal
I used to have some controls added dynamically through runtime on an ASP.NET webpage and was able to handle their events but now I put the code in a user control but it doesnt work. Any idea?
while (drr.Read())
{
LinkButton lnkbtnDownloadFile = new LinkButton();
//name of the file ---> drr[2]
lnkbtnDownloadFile.Click += new EventHandler(lnkbtnDownloadFile_Click);
lnkbtnDownloadFile.Text = drr[2].ToString();
PlaceHolderQuestions.Controls.Add(lnkbtnDownloadFile);
PlaceHolderQuestions.Controls.Add(new LiteralControl("<br/>"));
}
void lnkbtnDownloadFile_Click(object sender, EventArgs e)
{
if (sender is LinkButton)
DownloadFile((sender as LinkButton).Text);
}
so when i add a break point at the event handler it doesnt stop
I knew the reason. Because to bind the event handler with the control, the control must be drawn or initialized again, which didn't happen in my code and that's why the event wasn't fired
I have a page that dynamic create a table of contacts, if the contact got an email I also create an image button with a click event.I have a similar function in the rest of the page that works perfectly. And I used this before without any problems:
protected void CreateContactsList(IQueryable<AA_BranschFinder.Login.vyWebKontaktpersoner> lContacts) // Creates a table in the aspx from an IQueryable List
{
if (1 == 1)
{
htmlTblContactsContent.Rows.Clear();
foreach (var p in lContacts)
{
HtmlTableRow tr = new HtmlTableRow();
HtmlTableCell tdName = new HtmlTableCell();
HtmlTableCell tdCompanyName = new HtmlTableCell();
HtmlTableCell tdEmailAdress = new HtmlTableCell();
tdName.InnerHtml = p.strFnamn + " " + p.strEnamn;
tdCompanyName.InnerHtml = p.strNamn;
//Displays an image if the contacts has an email
if (p.strEpost != null)
{
ImageButton imgEmail = new ImageButton();
imgEmail.CommandArgument = p.intKundID.ToString();
imgEmail.ImageUrl = "images/symbol_letter.gif";
imgEmail.CssClass = "letter";
imgEmail.Click +=new ImageClickEventHandler(imgEmail_Click);
tdEmailAdress.Controls.Add(imgEmail);
}
tr.Cells.Add(tdCompanyName);
tr.Cells.Add(tdEmailAdress);
tr.Cells.Add(tdName);
htmlTblContactsContent.Rows.Add(tr);
}
}
}
void imgEmail_Click(object sender, ImageClickEventArgs e)
{
Breakpoint here
throw new NotImplementedException();
}
The page is living inside a java popup window. But I have paging numbers with similar event creation that works fine. But they are Linkbuttons.
Where are you calling your Create method? You need to do it before the other event handlers run, ideally in the Page.Init. Otherwise, the data posted back to the page are indicated an event firing for a control that doesn't yet exist.
I would also make sure that you give your ImageButton an ID. It will make debugging a lot easier.
imgEmail.ID = String.Format("EmailImageButton_{0}", p.intKundID);
An alternative solution is to look at the __eventtarget and __eventargument parameters in the Request object and see which button was clicked there.
You'll have to create the dynamic controls on EVERY postback. Also check the code in the imgEmail_Click event handler; if you have created the event handler method using .NET IDE's Alt + Shift + F10 method, then there's a chance that you have not removed this line -
throw new Exception("The method or operation is not implemented.");
If I´m not misstaking the imagebutton is a submit kind of button while the linkbutton is an a-tag with javascript. Maybe changing your imagebutton click (ie usesubmitbehaviour set to false) will solve your problem.
Make sure the event handler is added on your postbacks. When adding it just on initial page load, the event won't be handled! (Just encountered and solved this problem myself.)