Why can't i call ImageButton.ImageUrl??
Default.aspx:
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<asp:ImageButton ID="ImageButton1" runat="server" ImageUrl="Test1.jpg" CommandName="Delete" OnCommand="ImageButton_Command" />
</asp:Content>
Default.aspx.cs:
void ImageButton_Command(object sender, CommandEventArgs e)
{
string name = ***ImageButton1.ImageUrl***; //(Error)
}
There is no reason from the code provided for this control not to be recognised; it could be a discrepancy between your .aspx and .aspx.cs files (does the former properly relate to the latter?), or it could just be a build problem, have you done a complete clean and rebuild?
A solution, regardless of why this is happening for your current situation could be this:
protected void ImageButton_Command(object sender, CommandEventArgs e) {
var button = sender as ImageButton;
if (button != null) {
string name = button.ImageUrl;
}
}
It's important to do the null check here, since technically this event handler could be called by something other than the button(s) subscribed to raise the event, even though this shouldn't be the case.
Related
I made a very simple pannel updating wich will query a database and show a message on masterpage through a label.
Thus, I've put an updatePannel with a label and a timer within (obviously with a scriptManager) in my site's masterpage.
However, when I try to interact with the timer1 object, I receive an error message: "object not set to an instance of an object". I not receive this message when placing the schema in a blank page (without masterpage).
I must to run the query in masterpage because the users need to receive information whatever they are in my site.
How can I correctly place the components to do this work? what I'm doing wrong?
Thanks!
I just tried it within a master page without a problem. Here is the relevant code:
<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server" />
<asp:UpdatePanel ID="updMessage" runat="server">
<ContentTemplate>
<asp:Label ID="lblMessage" runat="server" />
<asp:Timer ID="tmrMessage" Interval="5000" ontick="tmrMessage_Tick" runat="server" />
</ContentTemplate>
</asp:UpdatePanel>
From master page code-behind:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
Session["Message"] = 1;
}
}
protected void tmrMessage_Tick(object sender, EventArgs e)
{
int message = (int)Session["Message"];
lblMessage.Text = message.ToString();
Session["Message"] = ++message;
}
The problem was where I was putting the panel, label and timer. I put in contentPlaceHolder, where the problem occours. Now I put the control in the form tag, then the problem is solved.
I'm getting some strange behaviour with viewstate being lost on postback for a .net application using Sitecore. I'm assuming it might be some config variable somewhere but I'm new to Sitecore and don't really know where to start looking.
UPDATE: Sitecore has now gotten back to us with an answer. We had recently added the dtSearch module, and AutomaticDataBind was set to true in the dtSearch.config which overrides the setting in the web config. We've now removed it and it works fine again.
I've made a mini test if that might help. It's two usercontrols on one page, both with a repeater. When updating the viewstate gets lost so even if I'm binding the updated repeater again the data for the other one will be lost.
Usercontrol 1:
<asp:Repeater runat="server" ID="Repeater1" OnItemDataBound="Repeater1_ItemBind">
<ItemTemplate>
<li>
<asp:Literal runat="server" ID="Literal1"></asp:Literal>
</li>
</ItemTemplate>
</asp:Repeater>
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
List<string> myTestList1 = new List<string>();
myTestList1.Add("a");
myTestList1.Add("b");
Repeater1.DataSource = myTestList1;
Repeater1.DataBind();
}
}
protected void Repeater1_ItemBind(object sender, RepeaterItemEventArgs e)
{
Literal Literal1 = (Literal)e.Item.FindControl("Literal1");
Literal1.Text = (string)e.Item.DataItem;
}
Usercontrol 2:
<asp:Repeater runat="server" ID="Repeater2" OnItemDataBound="Repeater2_ItemBind" OnItemCommand="Repeater2_Command">
<ItemTemplate>
<li>
<asp:Literal runat="server" ID="Literal2"></asp:Literal>
<asp:LinkButton ID="Update" CommandName="Update" runat="server">
update
</asp:LinkButton>
</li>
</ItemTemplate>
</asp:Repeater>
private string test = String.Empty;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
test = "a";
Repeater2.DataSource = test;
Repeater2.DataBind();
}
}
protected void Repeater2_ItemBind(object sender, RepeaterItemEventArgs e)
{
char c = (char)e.Item.DataItem;
Literal Literal2 = (Literal)e.Item.FindControl("Literal2");
Literal2.Text = c.ToString();
}
protected void Repeater2_Command(object sender, RepeaterCommandEventArgs e)
{
if (e.CommandName == "Update")
{
test = "b";
Repeater2.DataSource = test;
Repeater2.DataBind();
}
}
Does anyone have any ideas what might be going on? Let me know if I need to provide any more information. The most annoying thing is that it was working last week but I have no idea what has changed!
Thanks,
Annelie
Do you have System.Web.UI.WebControls.Repeater in the "typesThatShouldNotBeExpanded" section of your web.config?
I've found that there are definitely some things that don't work with the regular PostBack model in Sitecore... but this Repeater should be OK.
One trouble area is having FieldRenderers inside Repeaters. They don't seem to restore the Item property correctly on Postback.
As far as I can see, this thread describes exactly the same problem, but with DataGrid. See if setting AutomaticDataBind to 'false' in web.config helps.
I have to add a Page's variable into a ItemTemplate but dont know how.
For example:
<rad:RadMenuItem ID="f" runat="server" Text="Products">
<ItemTemplate>
<div class="pitem"><%= MyText %></div>
</ItemTemplate>
</rad:RadMenuItem>
The MyText variable does exist in the context and has value but the text does not show up
Another question:
How can I add MyText to the ASP.NET page like the following?
<asp:Button Text="<%=MyText%>" .../>
I dont want to edit the code like btn.Text=MyText, just want to do that on the .aspx file as required.
Answers to second question. (Btw, you should only ask one question at a time here on Stack Overflow.)
You could use
<asp:Button Text="<%# MyText %>" />
if you call DataBind() in you code behind.
public void Page_Init(object sender, EventArgs e)
{
DataBind();
}
If the databind is expensive, I believe you could use this code, so that you only call it once, and then save the values in the ViewState.
public void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
DataBind();
}
}
I'm starting to loose my nerves on some completely banal thing: I don't get user input from a TextBox :S
I do something like this (code behind aspx):
protected void Page_Load(object sender, EventArgs e)
{
if (!this.IsPostBack)
{
this._presenter.OnViewInitialized();
}
this._presenter.OnViewLoaded();
txtBox1.Text = "blah";
}
protected void Button1_Click(object sender, EventArgs e)
{
//Do sth with txtBox1.Text but when I read it, it is still the same as when a loaded the page at Page_Load, So if I entered "blahblah" in the txtBox1 via browser the text I get when I debug or run is still "blah"
}
And the aspx
<%# Page Language="C#" AutoEventWireup="true" CodeFile="InsertStudent.aspx.cs" Inherits="IzPT.Vb.Views.InsertStudent"
Title="VnosProfesorja" MasterPageFile="~/Shared/DefaultMaster.master" %>
<asp:Content ID="content" ContentPlaceHolderID="DefaultContent" Runat="Server">
<h1>Student</h1>
<p>
<table style="width:100%;">
<tr>
<td style="width: 139px">
Name</td>
<td>
<asp:TextBox ID="txtBox1" runat="server"></asp:TextBox>
</td>
</tr>
</table>
</p>
<p>
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Save" />
</p>
</asp:Content>
I also tried to do this with DetailsView and bind it to a list but when I read the values in the edit mode i had the same problem.
Any ideas?
You're setting the textbox Text property to "blah" on every Page_Load. Since ViewState has already been loaded at this point, you're overwriting whatever value the user entered.
If you only want to set the Text value one time, then make sure that you put it inside the if (!IsPostBack) check.
protected void Page_Load(object sender, EventArgs e)
{
if (!this.IsPostBack)
{
this._presenter.OnViewInitialized();
txtBox1.Text = "blah";
}
this._presenter.OnViewLoaded();
}
Your problem is that you are changing Value in Page_Load!
Page_Load is run before Button1_Click.
Move code from Page_Load to this
protected override void OnLoadComplete(EventArgs e)
{
txtBox1.Text = "blah";
}
Or protect your code... like this
if (!this.IsPostBack)
{
txtBox1.Text = "blah";
}
Page_Load is being called during the post back which is resetting the value in your text box. Change to
if (!this.IsPostBack)
{
txtBox1.Text = "blah";
this._presenter.OnViewInitialized();
}
Personally i would have a property in the view to set the textbox value from the presenter. In OnViewInitialized() or OnViewLoaded().
I have a UpdatePanel with a PlaceHold contained in it. I create some controls with Labels and Buttons, when Button is clicked it fires an Event that clears PlaceHolder and adds some Textboxes and a Button with an Event.
Problem is when this Button is click it appears to do a PostBack and does not fire Event associated with Button. I thought that since these controls are all contained within the UpdatePanel the would be no PostBack, am I missing the flow.
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<%--<%# Register assembly="System.Web.DynamicData, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" namespace="System.Web.DynamicData" tagprefix="cc1" %>
--%>
<div id="content" > <!--start content div-->
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
<br />
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<br />
<asp:UpdatePanel ID="upBlog" runat="server" UpdateMode="Conditional">
<ContentTemplate >
<asp:PlaceHolder ID="phBlog" runat="server"></asp:PlaceHolder>
</ContentTemplate>
<Triggers >
<%-- <asp:AsyncPostBackTrigger EventName="Click" ControlID = "btnSave" />--%>
</Triggers>
</asp:UpdatePanel>
<br />
</div> <!--ends content div-->
</asp:Content>
//Code Behind
protected override void OnInit(EventArgs e)
{
base.OnInit(e);
FirstView();
}
protected void Page_Load(object sender, EventArgs e)
{
}
private void FirstView()
{
FileStream fs = new FileStream(Server.MapPath(GlobalVar.compathver), FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
DataSet dset = new DataSet();
dset.ReadXml(fs);
fs.Close();
//other controls
Button btnComments = new Button();
btnComments.ID = "mybtnComments" + i.ToString();
btnComments.BorderWidth = 0;
btnComments.Text = MyFunc.CountComments(row["ID"].ToString(), dset) + " Comments";
phBlog.Controls.Add(btnComments);
btnComments.CommandArgument = row["ID"].ToString();
btnComments.BorderWidth = 0;
btnComments.Command += new CommandEventHandler(Button1_Click)
}
private void CommentView(string ID) /// THIS DOES not FIRE
{
DataView myCommentView = GetCommentView(ID);
Button btnCommentSave = new Button();
btnCommentSave.ID = "mySavebtnComments" + i.ToString();
btnCommentSave.Text = "Publish";
btnCommentSave.BackColor = Color.Aquamarine;
phBlog.Controls.Add(btnCommentSave);
btnCommentSave.CommandArgument = row["ID"].ToString();
btnCommentSave.Click += new EventHandler(btnSave_Click);
}
protected void Button1_Click(object sender, CommandEventArgs e)
{
CommentView(e.CommandArgument.ToString());
}
protected void btnSave_Click(object sender, EventArgs e)
//protected void btnSave_Click(object sender, CommandEventArgs e)
{
FileStream fsxml = new FileStream(Server.MapPath(GlobalVar.compathver), FileMode.Truncate, FileAccess.Write, FileShare.ReadWrite);
//other code
// XML Document Saved
xmldoc.Save(fsxml);
}
The UpdatePanel still does a postback. The whole page life-cycle is repeated when the button is clicked, and therefore the Page_Init and Page_Load for example will be executed again. AJAX does not remove the postbox, just hides it from the client.
I can't obviously see something wrong with the code you've posted however I would suggest you place a break point in the Page_Init as a start. This will be able to tell you if the postback is actually happening or not, since this will be fired if the button is indeed trying to fire the button click event. Keep in mind any click events is fired after the page life cycle completes (Theoretically).
On second look I would suggest that you change the Button event in the FirstView() method to a Click rather then a Command and see if this triggers the event.
it is better to add any event to the control before adding the control to another container.
secondly the button with the parameter name "btnCommentSave" will not work. You have to be careful on OnInit, OnLoad events. It is server-client side issue. The page pushed from server to client does not include the "btnCommentSave" button, so that this button stays at the clients page but it does not work.
btnComments works, because it is rendered by server before pushing to client at UpdatePanel's OnLoad function.
What rendered after OnLoad functions, does not work.