PostbackAction ???

How the heck does one go about using the PostbackAction in javascript? I can't find anyone who is successfully using it in javascript.Hi,

please check this example:

<%@. Page Language="C#" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><script runat="server"> protected void Page_Load(object sender, EventArgs e) { // This will drop the __doPostBack function on page. Page.ClientScript.GetPostBackEventReference(this, String.Empty); if (Page.IsPostBack) { lblTarget.Text = Request.Form["__EVENTTARGET"]; lblArgument.Text = Request.Form["__EVENTARGUMENT"]; } }</script><html xmlns="http://www.w3.org/1999/xhtml" ><head runat="server"> <title>Untitled Page</title></head><body> <form id="form1" runat="server"> <atlas:ScriptManager ID="sm" runat="server"></atlas:ScriptManager> <div> <input type="button" id="myButton" value="ClickMe" /> <br /> <span>Postback target: </span> <asp:Label ID="lblTarget" runat="server"></asp:Label> <br /> <span>Posback argument: </span> <asp:Label ID="lblArgument" runat="server"></asp:Label> </div> </form> <script type="text/xml-script"> <page> <components> <application load="application_load" /> </components> </page> </script> <script type="text/javascript"> function application_load() { var myButton = new Sys.UI.Button($('myButton')); myButton.set_id('myButton'); myButton.click.add(Function.createDelegate(this, clickHandler)); myButton.initialize(); function clickHandler(sender, e) { var postBack = new Sys.WebForms.PostBackAction(); postBack.set_target(sender.get_id()); postBack.set_eventArgument('myArgument'); postBack.performAction(); } } </script></body></html>

If you need only to cause a post back use this line in your javascript code:

__doPostBack();

If you need data from your client script code then use this:

__doPostBack('X','Y');

X --> This is some name you make up that allows you to identify what caused the post back on the server-side code.

Y--> This is the data you are passing back from your javascript. If you need more than one value passed back just separate the values with a comma or something. ie. '42,53' Then you can separate the string in your server side code.

The Server Side of things.

If you are only causing a post back then you don't need to worry about any server-side code. If you did pass data back put the following code in your Page_Load event and use the If statement to see what fired the post back since other controls will also use the javascript post back.

If Request.Form("__EVENTTARGET") = X Then

dim s as String = Request.Form("__EVENTARGUMENT")

'do something with your data

End IF

Hope this helps.

hello.

btw, x is normally used for sending the client id of the server side control that started the postback and y is used to send info associated with that action. for instance, if you have a button which has id bt, setting x to bt will automatically invoke a previouslly configured method on the server which was configured to handle the click event of that button.

PROBLEM - Timer Control calling Web Service?

Hi,

I have an issue, where I need to utiliize the AJAX Timer Control to continously poll an AJAX Web Service. Now I have successfully been calling the Web Service directly from Javascript, without any issue, however I need to perform some server-side actions.

Hence i need to use the Timer control to perform a onTick event call, which uses the same AJAX Web Service on the server side as follows:

iWebService ws = new iWebService();

string response = ws.iFunction("some data");

The problem here is i recieve the following error on every interval call from the Timer;

Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occured while processing the request on the server. The status code returned from the server was: 500

If anyone can help here, then that would be great, otherwise a temporary solution for my problem is to get the Timer to call a client side function instead of the server side one, and then for me to make a traditional Javascript request to the Web Service. If anyone knows how to do this, I would be very greatful.

Thank you!

We'd need to see some code to figure out what's going on, but rather than using the server Timer control, you're probably better off downloading the Futures January CTP and using the Sys.Preview.Timer control in there.

Hi, Steve

<formid="mainform"runat="server">

<asp:ScriptManagerID="ScriptManager1"runat="server"><Services><asp:ServiceReferencePath="iWebService.asmx"/></Services></asp:ScriptManager><asp:Timerid="timToolBar"runat="server"OnTick="Refresher"Interval="5000"></asp:Timer><asp:UpdatePanelID="upToolBar"runat="server"UpdateMode="Conditional"><Triggers><asp:AsyncPostBackTriggerControlID="timToolBar"/></Triggers><ContentTemplate><uc2:ctrlToolBarID="ToolBar"runat="server"/></ContentTemplate></asp:UpdatePanel>

//CODE BEHIND FILE 
 
protected void Refresher(object sender, EventArgs e) 
 {
iMediaService ws =newiMediaService();
string response = ws.GetEvent(sessionid.Value, 2000);
//Some code here to update the Toolbar
 }

It's pretty simple to be honest, the call to the WS basically returns some info I use to update the ToolBar. I need to call the WS continuosly, but information is only returned if the iWebService.RegisterClient is called first, before this, the call to GetEvent returns an empty string, which is correct. But after the RegisterClient has been called, i should get some data back from every call to the ws.GetEvent function.

Simple Call Logic

1. Register Client

2. Repeat call to GetEvent & Update ToolBar

The first call to GetEvent after the RegisterClient works fine and i recieve the correct data, but after that, when the Timer fires every interval, i get that error message. The ToolBar is a Web User Control, now simply I could just output the response string from GetEvent to a TextBox for testing, but like i said, the first call is fine, after that it just throws that error.

Also as i was debugging this, the debugger was not breaking on my breakpoint on the first line of the Refresher function, i think theres a problem after i write some info to the ToolBar.

The 500 suggests that something's breaking on the server. I would recommend grabbingNikhil's Web Development Helper and taking a look at the request and 500 response. It's quite likely the contents of the response will show you exactly what the problem is.

(As it is, I can't really guess what's going wrong.)

Problem adding Atlas to an existing site

I have created a test atlas site and successfully used the update panel with some dropdown lists. Now I want to incorporate Atlas into an existing web site. I created a test page in the existing web site and recreated my test page in the existing site. The Atlas components to not seem to work... instead of an ajax update it is doing a full postback.

Here are the things I've checked:

- Atlas dll is included in bin
- Web.config file is updated and matches the test site config exactly
- Test web page is exactly the same as on the test site
- The .asbx extension is registered correctly
- The web site is configured for .Net 2.0

I'm not even sure how to figure out what else is going on here. Any other suggestions or things I can look at here? Thanks!

hello.

have you created a simple page on that site? if so, post it here so that we can see if there's anything wrong with it or if it's a configuration problem...

I have done a simple page on the test site (which works) and the exact same page in the existing site (which doesn't work) so I'm not sure the code provides any value. But here is another clue. When I add the trigger to the update panel through the designer, switch to code view, and then back to designer I get an "error creating control"

It says: Triggers could not be initialized. Triggers could not be added to the collection. Details: Object does not match target type.

Here is the web page code:

<%@. Page Language="C#" AutoEventWireup="true" CodeFile="IssueTest.aspx.cs" Inherits="ProjectTrack_IssueTest" %><%@. Register Assembly="AtlasControlToolkit" Namespace="AtlasControlToolkit" TagPrefix="cc1" %><!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 id="Head1" runat="server"> <title>Untitled Page</title> </head><body> <form id="form1" runat="server"> <atlas:ScriptManager ID="ScriptManager1" runat="server" EnablePartialRendering="true"> </atlas:ScriptManager> <asp:DropDownList ID="ClientsDDL" runat="server" DataSourceID="RDI_DB" DataTextField="CO_NAME" DataValueField="Client_ID" OnSelectedIndexChanged="ClientsDDL_SelectedIndexChanged" AutoPostBack=true> </asp:DropDownList><atlas:UpdatePanel runat="server" ID="UpdatePanel1" Mode="Conditional"> <Triggers> <atlas:ControlEventTrigger ControlID="ClientsDDL" EventName="SelectedIndexChanged" /> </Triggers> <ContentTemplate> <asp:DropDownList ID="ProjectsDDL" runat="server" DataTextField="PROJ_NAME" DataValueField="PROJECT_NO" AppendDataBoundItems=true AutoPostBack="True" OnSelectedIndexChanged="ProjectsDDL_SelectedIndexChanged"><asp:ListItem>Select a client</asp:ListItem> </asp:DropDownList> </ContentTemplate> </atlas:UpdatePanel> <asp:DropDownList ID="PhaseDDL" runat="server" DataTextField="DESCRIPTION" DataValueField="PHASE" AppendDataBoundItems=true AutoPostBack="True"><asp:ListItem>Select a project</asp:ListItem> </asp:DropDownList> <asp:DropDownList ID="TaskDDL" runat="server" DataTextField="TASK" DataValueField="TASK" AppendDataBoundItems=true><asp:ListItem>Select a phase</asp:ListItem> </asp:DropDownList> <asp:SqlDataSource ID="RDI_DB" runat="server" ConnectionString="<%$ ConnectionStrings:RDI_DevelopmentConnectionString%>" SelectCommand="SELECT [Client_ID], [CO_NAME] FROM [CLIENTS]"></asp:SqlDataSource> <asp:SqlDataSource ID="ProjectListDB" runat="server" ConnectionString="<%$ ConnectionStrings:RDI_DevelopmentConnectionString%>" SelectCommand="SELECT [PROJECT_NO], [PROJ_NAME] FROM [PROJ_NO] WHERE ([CLIENT_ID] = @.CLIENT_ID)"> <SelectParameters> <asp:ControlParameter ControlID="ClientsDDL" Name="CLIENT_ID" PropertyName="SelectedValue" Type="Int32" /> </SelectParameters> </asp:SqlDataSource> <asp:SqlDataSource ID="PhaseListDB" runat="server" ConnectionString="<%$ ConnectionStrings:RDI_DevelopmentConnectionString%>" SelectCommand="SELECT [PHASE], [DESCRIPTION] FROM [PHASE] WHERE (([CLIENT_ID] = @.CLIENT_ID) AND ([PROJECT_NO] = @.PROJECT_NO)) ORDER BY [DESCRIPTION]"> <SelectParameters> <asp:ControlParameter ControlID="ClientsDDL" Name="CLIENT_ID" PropertyName="SelectedValue" Type="Int32" /> <asp:ControlParameter ControlID="ProjectsDDL" Name="PROJECT_NO" PropertyName="SelectedValue" Type="Int32" /> </SelectParameters> </asp:SqlDataSource> <asp:SqlDataSource ID="TasksListDB" runat="server" ConnectionString="<%$ ConnectionStrings:RDI_DevelopmentConnectionString%>" SelectCommand="SELECT [TASK], [DESCRIPTION] FROM [TASK] WHERE ([PHASE] = @.PHASE)"> <SelectParameters> <asp:ControlParameter ControlID="PhaseDDL" Name="PHASE" PropertyName="SelectedValue" Type="Int32" /> </SelectParameters> </asp:SqlDataSource>   </form></body></html>

hello.

tell me something: can you run the following code with success:

<atlas:scriptmanager runat="server" id="manager" enablepartialrendering="true" />

<atlas:updatepanel runat="server" id="panel">
<contenttemplate>
<asp:button runat="server" Text="Submit" />
<%=DateTime.Now.ToString() %>
</contenttemplate>
</atlas:updatepanel>

Same results... in my existing web site it causes a postback. In my test web site it does an ajax update (no postback). Does that tell you anything? Thanks.

hello again.

one more question:

open the previous page on the browser, right click on it and look at the source code. find the script element that is used to load the js file (you might have several elements that user the webresource.axd on the page; in this case, you'll have to repeat it to all the items you find). copy the address that is in the src attribute of the script element and add it to the url of the page you have in the browser (you'll probably have to delete a portion of the url before adding the value you've copied from the source file).

can you get the file? ie, can you get the js atlas file? if you can't get the file (you should see the tradidional save dialog), then you have a iis configuration problem...