private CascadeDropdownFieldControl GetParentCausedPostback()
{
if (!Page.IsPostBack)
{
return(null);
}
var controlPostback = Page.Request["__EVENTTARGET"];
CascadeDropdownFieldControl postbackControl = null;
List <CascadeDropdownFieldControl> childControls = new List <CascadeDropdownFieldControl>();
//find post back caused by control
foreach (var control in SPContext.Current.FormContext.FieldControlCollection)
{
if (control is CascadeDropdownFieldControl)
{
if (((CascadeDropdownFieldControl)control).cascader.UniqueID == controlPostback)
{
postbackControl = control as CascadeDropdownFieldControl;
continue;
}
childControls.Add(control as CascadeDropdownFieldControl);
}
}
if (postbackControl == null)
{
return(null);
}
if (this == postbackControl)
{
return(null);
}
return(postbackControl);
}
private string GetParentValue()
{
if (parentField.CascadeType == "Parent")
{
return(null);
}
foreach (var field in SPContext.Current.FormContext.FieldControlCollection)
{
if (field is CascadeDropdownFieldControl)
{
CascadeDropdownFieldControl cdfField = field as CascadeDropdownFieldControl;
if (cdfField.FieldName == parentField.CascadeParent)
{
if (cdfField.cascader != null)
{
//bool parentChanged = DidParentChange();
CascadeDropdownFieldControl parentPostbackControl = GetParentCausedPostback();
if (Page.IsPostBack && parentPostbackControl != null && parentPostbackControl.FieldName == parentField.CascadeParent)
{
var headerData = Page.Request[cdfField.cascader.UniqueID];
if (!String.IsNullOrEmpty(headerData))
{
return(headerData);
}
}
return(cdfField.cascader.SelectedValue);
}
}
}
}
return(null);
}
private bool DidParentChange()
{
if (!Page.IsPostBack)
{
return(false);
}
var controlPostback = Page.Request["__EVENTTARGET"];
CascadeDropdownFieldControl postbackControl = null;
List <CascadeDropdownFieldControl> childControls = new List <CascadeDropdownFieldControl>();
//find post back caused by control
foreach (var control in SPContext.Current.FormContext.FieldControlCollection)
{
if (control is CascadeDropdownFieldControl)
{
if (((CascadeDropdownFieldControl)control).cascader.UniqueID == controlPostback)
{
postbackControl = control as CascadeDropdownFieldControl;
continue;
}
childControls.Add(control as CascadeDropdownFieldControl);
}
}
if (postbackControl == null)
{
return(false);
}
if (this == postbackControl)
{
return(false);
}
if (childControls.Count > 0)
{
var control = childControls[0];
while (control != null)
{
if (control.parentField.CascadeParent == postbackControl.FieldName)
{
return(true);
}
//find controls parent control and check
CascadeDropdownFieldControl tempControl = null;
for (int x = 0; x < childControls.Count; x++)
{
if (control.parentField.CascadeParent == childControls[x].FieldName)
{
tempControl = childControls[x];
break;
}
}
if (tempControl != control)
{
control = tempControl;
}
}
}
return(false);
}