Hi,
I am trying to create a simple ajax webpart, however all the Microsoft
sugguestions seem to be failing.
I have installed Ajax and updated the web.config.
The issue is with the scriptmanager. When I run the sample code below I get
the following exception when adding the scripmanager to the masterpage
"The control collection cannot be modified during DataBind, Init, Load,
PreRender or Unload phases."
If I use the following code rather than Page.Master.Page.Controls.AddAt(1,
scriptManager), I don't get an exception, but when the user clicks the
button, CreateChildControls is called rather than HandleButtonClick
if (ScriptManager.GetCurrent(this.Page) == null)
{
ScriptManager Manager = new ScriptManager();
Manager.EnablePartialRendering = true;
this.Controls.AddAt(0, Manager);
}
Could somone please help. I would rather add the scriptmanager dynamically
if possible.
THANKS.
SAMPLE CODE
private Label label;
private TextBox textBox;
private ScriptManager scriptManager;
protected override void OnInit(EventArgs e)
{
base.OnInit(e);
// Let's find if the ScriptManager exists and add it if
not
scriptManager = ScriptManager.GetCurrent(Page);
if (scriptManager == null)
{
scriptManager = new ScriptManager();
if (Page.Form != null)
{
Page.Master.Page.Controls.AddAt(1, scriptManager)
}
}
}
protected override void CreateChildControls()
{
base.CreateChildControls();
this.EnsureUpdatePanelFixups();
UpdatePanel up = new UpdatePanel();
up.ID = "UpdatePanel1";
up.ChildrenAsTriggers = true;
up.UpdateMode = UpdatePanelUpdateMode.Conditional;
this.Controls.AddAt(1, up);
this.textBox = new TextBox();
this.textBox.ID = "TextBox";
up.ContentTemplateContainer.Controls.Add(this.textBox);
this.label = new Label();
this.label.Text = "Enter your name.";
up.ContentTemplateContainer.Controls.Add(this.label);
LinkButton button = new LinkButton();
button.Text = "Say Hello";
button.ID = "HelloButton"; // Some controls need an ID to make
them work with AJAX postbacks.
button.Click += new EventHandler(HandleButtonClick);
up.ContentTemplateContainer.Controls.Add(button);
}
private void HandleButtonClick(object sender, EventArgs eventArgs)
{
this.label.Text = "Hello " + this.textBox.Text;
}
private void EnsureUpdatePanelFixups()
{
if (this.Page.Form != null)
{
String fixupScript = @"
_spBodyOnLoadFunctionNames.push(""_initFormActionAjax"");
function _initFormActionAjax()
{
if (_spEscapedFormAction == document.forms[0].action)
{
document.forms[0]._initialAction = document.forms[0].action;
}
}
var RestoreToOriginalFormActionCore = RestoreToOriginalFormAction;
RestoreToOriginalFormAction = function()
{
if (_spOriginalFormAction != null)
{
RestoreToOriginalFormActionCore();
document.forms[0]._initialAction = document.forms[0].action;
}
}
";
ScriptManager.RegisterStartupScript(this,
typeof(AjaxUpdatePanelPart), "UpdatePanelFixup", fixupScript, true);
}
}
}
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