Ajax error: objects

Showing posts with label objects. Show all posts

Wednesday, March 28, 2012

accessing server-side objects from client

Hi wizards,

I'm writting this Ajax Extender Control to switch objects within a panel. It was supposed to work like this: you choose a data-type in a dropdown list (which is the extended object, by the way -- this.get_element()), and the content of a Panel (<div>) changes accordingly; i.e., if you choose "DateTime" in the dropdown the panel will show a Calendar, etc.

In order to perform that I have to fetch this object from server. So, my question is: how can I fetch a server-side object from client-side? How can I change its properties?

For example: an object with property Visible=false is not rendered and therefore does not appear on client; but what if I still want to set it to Visible=true? Can I grab the rendered portion of this client-code (HTML) and insert in the current page?

I'm not sure whether I made myself any clear; I'm confused, so the question may be obscure too. Let me know if you need more information.

thanks a lot in advance,

Do you know vb or C#? You will need to submit the page and do some code-behind.

rpack79:
Do you know vb or C#? You will need to submit the page and do some code-behind.

Well, yes, I think I know C# -- I'm not sure whether I know enough, though.

Sorry, I don't understand these terms; what is code-behind? What do you mean by "submit the page" -- which page?

That sounds kinda vague to me... :-|

thanks a lot for your post,

What is this web page for? Post the code you already have if any.

You may be better offtriggering a partial postback via __doPostBack(), to change the Visible property on your controls at the server.

Another option would be to style the controls with CSS to hide them. Using "display: none;" instead of the Visible property. Then, the server controls still render their HTML, but are hidden on the client. Take a look atmy post about inline label editing for an example of how to do that.

Your blog is awesome!!! I'll try the __doPostBack approach. Thanks a lot for your prompt reply and congratulations for the great work! :-)

my best regards,

Accessing objects outside update panel

I am trying to access the label or div which is outside the update panel after its post back occurs.

here is code...

how can I make that alert work in Button1_Click method?

thanks in advance...

protected void Page_Load(object sender, EventArgs e) { Label1.Text ="Standard Page Load: " + DateTime.Now.ToLongTimeString(); Label2.Text ="Standard Page Load: " + DateTime.Now.ToLongTimeString(); }protected void Button1_Click(object sender, EventArgs e) { lt.Text ="alert(document.getElementById('" + Label1.ClientID +"').value);"; Label2.Text ="Ajax Page Load: " + DateTime.Now.ToLongTimeString() + lt.Text; }

<html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"> <title>Untitled Page</title></head><body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server" /> <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label><div> <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional"> <ContentTemplate> <asp:Label ID="Label2" runat="server" Text="Label"></asp:Label> <br /> <br /> <script language="javascript"> <asp:Literal id="lt" runat="server" /> </script> <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" /> </ContentTemplate> </asp:UpdatePanel> </form></body></html>

Try this:

protected void Button1_Click(object sender, EventArgs e)
 {
 string script = "alert($get('" + Label1.ClientID + "').innerText)"; ScriptManager.RegisterStartupScript(this, this.GetType(), "alert", script, true);
 Label2.Text ="Ajax Page Load: " + DateTime.Now.ToLongTimeString();
 }

thanks Rashid... that was helpful.

Accessing objects in an UpdatePanel

I'm trying to reference a textbox that is located in an updatepanel and was successfully doing so until I installed the latest version of the CTP (Sept 2006) and now I don't have programmatic access to the objects in the update panel...how can I get to this? Below is my same code that worked in the last version:

<divid="footer">
<atlas:UpdatePanelID="udpStatusBar"runat="server"Mode="Always">
<ContentTemplate>
<asp:TextBoxID="tbxStatusMessage"runat="server"Enabled="False"SkinID="StatusBar"Width="455px"></asp:TextBox>
<asp:TextBoxID="tbxStats"runat="server"Enabled="False"SkinID="StatusBar"></asp:TextBox>
<asp:TextBoxID="tbxDate"runat="server"Enabled="False"SkinID="StatusBar"></asp:TextBox>
</ContentTemplate>
</atlas:UpdatePanel>
</div>

ASPX.cs

privatevoid DisplayMessage(string s)
{
((TextBox)this.Parent.Page.Master.Controls[3].FindControl("tbxStatusMessage")).Text = s;
}

myost2921:
I'm trying to reference a textbox that is located in an updatepanel and was successfully doing so until I installed the latest version of the CTP (Sept 2006) and now I don't have programmatic access to the objects in the update panel...how can I get to this? Below is my same code that worked in the last version:
<divid="footer">
<atlas:UpdatePanelID="udpStatusBar"runat="server"Mode="Always">
<ContentTemplate>
<asp:TextBoxID="tbxStatusMessage"runat="server"Enabled="False"SkinID="StatusBar"Width="455px"></asp:TextBox>
<asp:TextBoxID="tbxStats"runat="server"Enabled="False"SkinID="StatusBar"></asp:TextBox>
<asp:TextBoxID="tbxDate"runat="server"Enabled="False"SkinID="StatusBar"></asp:TextBox>
</ContentTemplate>
</atlas:UpdatePanel>
</div>
ASPX.cs
privatevoid DisplayMessage(string s)
{
((TextBox)this.Parent.Page.Master.Controls[3].FindControl("tbxStatusMessage")).Text = s;
}

You should be able to access the control directly. This should work for your DisplayMessage function:

tbxStatusMessage.Text = s;

The problem is that my DisplayMessage is sitting in a UserControl that is loaded dynamically into the page. The UserControl knows nothing of the page until runtime.
The problem is that the DisplayMessage method is found in a UserControl which is being dynamically added to the page at runtime. I'm having to use the FindControl command because of that reason. Any more ideas?

What error are you getting? Have you tried just calling page.findcontrol()?

A quick example:

.aspx file:

<%@. Page Language="VB" AutoEventWireup="false" CodeFile="wizard_validation.aspx.vb" Inherits="wizard_validation" %><%@. Register Assembly="AtlasControlToolkit" Namespace="AtlasControlToolkit" TagPrefix="act" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" ><head runat="server"> <title>Untitled Page</title></head><body> <form id="form1" runat="server"> <div> <atlas:ScriptManager runat="server" ID="blah2" EnablePartialRendering="true"></atlas:ScriptManager> <atlas:UpdatePanel runat="server" ID="blah" Mode="conditional"> <ContentTemplate> <asp:Wizard ID="NewFormWizard" runat="server" Width="100%" BackColor="#EFF3FB" BorderColor="#B5C7DE" BorderWidth="1px" Font-Names="Verdana" Font-Size="0.8em" CancelButtonText="Cancel" DisplayCancelButton="true" > <WizardSteps> <asp:TemplatedWizardStep ID="WizardStepGeneral" runat="server" Title="*General"> <ContentTemplate> <h1>Header!</h1> </ContentTemplate> </asp:TemplatedWizardStep> </WizardSteps> </asp:Wizard> </ContentTemplate> </atlas:UpdatePanel> </div> </form></body></html>

Code-behind (in VB, but I'm sure you can figure it out):

Protected Sub Page_Load(ByVal senderAs Object,ByVal eAs System.EventArgs)Handles Me.LoadDim iAs Integer Dim tmpwizardAs Wizard tmpwizard = Page.FindControl("NewFormWizard")If tmpwizardIs Nothing Then' failure i = 0Else' success i = 1End If End Sub

It returns with a success on that sample page. However, this is not a dynamically added control, so if you could post an example if using "Page.FindControl" doesn't work, it'd be easier to help ya out.

I figured out the problem...turns out it was actually simplified even more in this release and the cause of the error was something completely different. Thanks Matt!

Monday, March 26, 2012

Access Objects in diferent webControl

Hello,

I've been wondering if it's possible to manipulate objects from a webcontrol inside the vb code of diferent webcontrol.

Mainly what I'm trying to archieve is the usage of AJAX and its async triggers. I have a list of items, each with a button associated, all created at runtime, and I want to make them triggers of a shopping bag located inside an updatePanel on a different webcontrol that is already loaded inside the same page.

Is this possible? If so, how?

Thx

You can add you controls to the UpdatePanel's trigger collection which will cause these to update the UpdatePanel, seehttp://morewally.com/cs/blogs/wallym/archive/2006/09/20/359.aspx

-Damien

Hi,

Here:Trigger PostBack to an UpdatePanel from a separate UserControl?

A example for you to do this.

Best Regards,

Wednesday, March 28, 2012

accessing server-side objects from client

Accessing objects outside update panel

Accessing objects in an UpdatePanel

Monday, March 26, 2012

Access Objects in diferent webControl

Ajax error

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