/// <summary>
/// Gets the validation target expression.
/// </summary>
public static string GetValidationTargetExpression(DotvvmControl control)
{
if (!(bool)control.GetValue(Validate.EnabledProperty))
{
return(null);
}
// find the closest control
int dataSourceChanges;
var validationTargetControl = control.GetClosestWithPropertyValue(out dataSourceChanges, c => c.GetValueBinding(Validate.TargetProperty) != null);
if (validationTargetControl == null)
{
return("$root");
}
// reparent the expression to work in current DataContext
// FIXME: This does not work:
var validationBindingExpression = validationTargetControl.GetValueBinding(Validate.TargetProperty);
string validationExpression = validationBindingExpression.GetKnockoutBindingExpression();
validationExpression = string.Join("", Enumerable.Range(0, dataSourceChanges).Select(i => "$parent.")) + validationExpression;
return(validationExpression);
}
