Consider the following scenario:
| • | You use the Microsoft AJAX 1.0 Control toolkit for Microsoft ASP.NET or the AJAX 1.0 Extensions for ASP.NET to create a custom Web Part for a Microsoft Office SharePoint Server 2007 Web site or for a Microsoft Windows SharePoint Services 3.0 Web site. |
| • | The custom Web Part contains an UpdatePanel control that includes a _doPostBack() function, such as a LinkButton control. |
| • | You add the custom Web Part to a SharePoint Services 2007 Web site or to a Windows SharePoint Services 3.0 Web site. The URL of the Windows SharePoint Services 3.0 Web site or the SharePoint Server 2007 Web site contains international characters or language-specific characters. |
| • | You visit the Windows SharePoint Services 3.0 Web site or the SharePoint Server 2007 Web site. Then, you try to update selected content in the Web Part. |
In this scenario, a regular postback request occurs instead of an asynchronous ASP.NET AJAX postback request.
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This issue occurs because both Windows SharePoint Services and ASP.NET AJAX cache some types of form actions. Therefore, conflicts may occur.
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To work around this issue, use code that resembles the following example to add an
UpdatePanel control to a Web Part in SharePoint Server 2007 or in Windows SharePoint Services 3.0.
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;
}
}The following code is an example of a Web Part that includes the previous
UpdatePanel control. Additionally, the
EnsureUpdatePanelFixups method is used to register the Script Manager control in the Web Part.
public class AjaxUpdatePanelPart : WebPart
{
private Label label;
private TextBox textBox;
protected override void CreateChildControls()
{
base.CreateChildControls();
this.EnsureUpdatePanelFixups();
UpdatePanel up = new UpdatePanel();
up.ID = "UpdatePanel1";
up.ChildrenAsTriggers = true;
up.UpdateMode = UpdatePanelUpdateMode.Conditional;
this.Controls.Add(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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