I'm trying to filter a JTable using a TableRowFilter . It works for me on a simple example , but I can't seem to get it to work on the real thing. The filter is called , the logs are printed - but I staill see the rows . Any ideas?
public class TopicTable extends JTable {
...
public TopicTable(ITopic topic) {
super();
TopicTableDataModel model = new TopicTableDataModel(topic);
setModel(model);
setRowSorter(generateTableRowSorter(model));
setFillsViewportHeight(true);
setColumnRenderers();
}
private TableRowSorter<TableModel> generateTableRowSorter(TableModel model) {
RowFilter<Object, Object> classFilter = new RowFilter<Object, Object>() {
#Override
public boolean include(javax.swing.RowFilter.Entry<? extends Object, ? extends Object> entry) {
log.debug("Filtering? " + entry.getValue(1));
return false;
}
};
TableRowSorter<TableModel> sorter = new TableRowSorter<TableModel>(model);
sorter.setRowFilter(classFilter);
return sorter;
}
...
}
As all stupid bugs go - this was one of them . In another class that use this table , I used table.setAutoCreateRowSorter(true) - so even thought the original sorter still ran , the default one also did , and then nothing happened.
Related
I have the following view model
public class ProjectVM
{
....
[Display(Name = "Category")]
[Required(ErrorMessage = "Please select a category")]
public int CategoryID { get; set; }
public IEnumerable<SelectListItem> CategoryList { get; set; }
....
}
and the following controller method to create a new Project and assign a Category
public ActionResult Create()
{
ProjectVM model = new ProjectVM
{
CategoryList = new SelectList(db.Categories, "ID", "Name")
}
return View(model);
}
public ActionResult Create(ProjectVM model)
{
if (!ModelState.IsValid)
{
return View(model);
}
// Save and redirect
}
and in the view
#model ProjectVM
....
#using (Html.BeginForm())
{
....
#Html.LabelFor(m => m.CategoryID)
#Html.DropDownListFor(m => m.CategoryID, Model.CategoryList, "-Please select-")
#Html.ValidationMessageFor(m => m.CategoryID)
....
<input type="submit" value="Create" />
}
The view displays correctly but when submitting the form, I get the following error message
InvalidOperationException: The ViewData item that has the key 'CategoryID' is of type 'System.Int32' but must be of type 'IEnumerable<SelectListItem>'.
The same error occurs using the #Html.DropDownList() method, and if I pass the SelectList using a ViewBag or ViewData.
The error means that the value of CategoryList is null (and as a result the DropDownListFor() method expects that the first parameter is of type IEnumerable<SelectListItem>).
You are not generating an input for each property of each SelectListItem in CategoryList (and nor should you) so no values for the SelectList are posted to the controller method, and therefore the value of model.CategoryList in the POST method is null. If you return the view, you must first reassign the value of CategoryList, just as you did in the GET method.
public ActionResult Create(ProjectVM model)
{
if (!ModelState.IsValid)
{
model.CategoryList = new SelectList(db.Categories, "ID", "Name"); // add this
return View(model);
}
// Save and redirect
}
To explain the inner workings (the source code can be seen here)
Each overload of DropDownList() and DropDownListFor() eventually calls the following method
private static MvcHtmlString SelectInternal(this HtmlHelper htmlHelper, ModelMetadata metadata,
string optionLabel, string name, IEnumerable<SelectListItem> selectList, bool allowMultiple,
IDictionary<string, object> htmlAttributes)
which checks if the selectList (the second parameter of #Html.DropDownListFor()) is null
// If we got a null selectList, try to use ViewData to get the list of items.
if (selectList == null)
{
selectList = htmlHelper.GetSelectData(name);
usedViewData = true;
}
which in turn calls
private static IEnumerable<SelectListItem> GetSelectData(this HtmlHelper htmlHelper, string name)
which evaluates the the first parameter of #Html.DropDownListFor() (in this case CategoryID)
....
o = htmlHelper.ViewData.Eval(name);
....
IEnumerable<SelectListItem> selectList = o as IEnumerable<SelectListItem>;
if (selectList == null)
{
throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture,
MvcResources.HtmlHelper_WrongSelectDataType,
name, o.GetType().FullName, "IEnumerable<SelectListItem>"));
}
Because property CategoryID is typeof int, it cannot be cast to IEnumerable<SelectListItem> and the exception is thrown (which is defined in the MvcResources.resx file as)
<data name="HtmlHelper_WrongSelectDataType" xml:space="preserve">
<value>The ViewData item that has the key '{0}' is of type '{1}' but must be of type '{2}'.</value>
</data>
according to stephens (user3559349) answer, this can be useful:
#Html.DropDownListFor(m => m.CategoryID, Model.CategoryList ?? new List<SelectListItem>(), "-Please select-")
or in ProjectVM:
public class ProjectVM
{
public ProjectVM()
{
CategoryList = new List<SelectListItem>();
}
...
}
Most Likely Caused some sort of error redirecting to your page and you not initializing your model's drop down lists again.
Make sure that you initialize your drop downs in either the model's constructor or every time before you send said model to the page.
Otherwise you will need to maintain the state of the drop down lists either through the view bag or through the hidden value helpers.
OK, the poster's canned answer neatly explained why the error occurred, but not how to get it to work. I'm not sure that's really an answer, but it did point me in the right direction.
I ran into the same issue and found a slick way to resolve it. I'll try to capture that here. Disclaimer - I work on web pages once a year or so and really don't know what I'm doing most of the time. This answer should in no way be considered an "expert" answer, but it does the job with little work...
Given that I have some data object (most likely a Data Transfer Object) that I want to use a drop-down list to supply valid values for a field, like so:
public class MyDataObject
{
public int id;
public string StrValue;
}
Then the ViewModel looks like this:
public class MyDataObjectVM
{
public int id;
public string StrValue;
public List<SectListItem> strValues;
}
The real problem here, as #Stephen so eloquently described above, is the select list isn't populated on the POST method in the controller. So your controller methods would look like this:
// GET
public ActionResult Create()
{
var dataObjectVM = GetNewMyDataObjectVM();
return View(dataObjectVM); // I use T4MVC, don't you?
}
private MyDataObjectVM GetNewMyDataObjectVM(MyDataObjectVM model = null)
{
return new MyDataObjectVM
{
int id = model?.Id ?? 0,
string StrValue = model?.StrValue ?? "",
var strValues = new List<SelectListItem>
{
new SelectListItem {Text = "Select", Value = ""},
new SelectListITem {Text = "Item1", Value = "Item1"},
new SelectListItem {Text = "Item2", Value = "Item2"}
};
};
}
// POST
public ActionResult Create(FormCollection formValues)
{
var dataObject = new MyDataObject();
try
{
UpdateModel(dataObject, formValues);
AddObjectToObjectStore(dataObject);
return RedirectToAction(Actions.Index);
}
catch (Exception ex)
{
// fill in the drop-down list for the view model
var dataObjectVM = GetNewMyDataObjectVM();
ModelState.AddModelError("", ex.Message);
return View(dataObjectVM);
)
}
There you have it. This is NOT working code, I copy/pasted and edited to make it simple, but you get the idea. If the data members in both the original data model and the derived view model have the same name, UpdateModel() does an awesome job of filling in just the right data for you from the FormCollection values.
I'm posting this here so I can find the answer when I inevitably run into this issue again -- hopefully it will help someone else out as well.
I had the same problem, I was getting an invalid ModelState when I tried to post the form. For me, this was caused by setting CategoryId to int, when I changed it to string the ModelState was valid and the Create method worked as expected.
In my case the first ID in my list was zero, once I changed the ID to start from 1, it worked.
I want to handle Property.ValueChangeEvent in my IndexedContainer, when the value is changed in specific row. I expected the "event" passed as argument will supply the information what has been changed.
IndexedContainer container = new IndexedContainer();
.
. add container properties, insert items ...
.
container.addValueChangeListener(this)
.
.
public void valueChange(ValueChangeEvent event) {
// How to get itemId and another properties from the same item?
event.getProperty(); // This returns only whole container
}
The getProperty() function doesn't give me the information, from which row and column it comes. Thanks for help.JH
Usually a container is used within a component, and is that component that listens for "valueChange".
The way to get the selected item is:
Item itemSelected = component.getContainerDataSource().getItem(component.getValue());
//get for example "id" property
Integer id = (Integer) itemSelected.getItemProperty("id").getValue();
Otherwise, are you just using a container alone? If so can you be more specific? because it's not a "standard" way.
Regards
It's not very efficient, but it works:
container.addValueChangeListener(new ValueChangeListener() {
private static final long serialVersionUID = 1L;
#Override
public void valueChange(ValueChangeEvent event) {
for (Object itemId : container.getItemIds()) {
for (Object propId : container.getContainerPropertyIds()) {
Property<?> p = container.getContainerProperty(itemId, propId);
Object o = ((EventObject) event).getSource();
if (p.equals(o)) {
System.out.println("itemId: " + itemId);
System.out.println("propertyId: " + propId);
return;
}
}
}
}
});
The event is a PropertyValueChangeEvent and the getSource() method returns IndexedContainerProperty.
The problem is that those are private classes.
The IndexedContainerProperty contains the itemId and the propertyId too.
i have a little question for Java-Fx and Observable-lists. I want to build a Timetable for a couple of persons. There for i have a Person-Class, in which i want to give every Person its own Observable-list in the Constructor. Someone got a notation for this case? i have already tried so stuff but nothing seems to work. On one hand i need an Attribute for the List to build a getter-Method for it and i want to give each Person its own List.
this is my Attribut:
ObservableList personTableList = FXCollections.observableArrayList();
now i need the notation for the Constructor!
thanks, Manuel
I don't know if I understand you exactly what you want to gain.
E.g.:
public class Person {
private ObservableList personTableList;
public Person() {
this(null);
}
public Person(ObservableList list) {
if (list == null) {
this.personTableList = FXCollections.observableArrayList();
} else {
this.personTableList = list;
}
}
public ObservableList getPersonTableList() {
return this.personTableList;
}
public void setPersonTableList(ObservableList list) {
this.personTableList = list;
}
}
Using e.g.:
new Person();
I think I'm missing something fundamental when implementing a LinqToHql generator class.
I've successfully registered the SQL Server 2008 contains query using a custom dialect with this registration:
RegisterFunction("contains", new StandardSQLFunction("contains", null));
I have only one class with a full text index to be queried:
public class SearchName
{
public virtual Guid Id {get; set;}
public virtual string Name {get; set;} // this is the search field
}
The contains function works properly in HQL:
var names = Session.CreateQuery("from SearchName where contains(Name,:keywords)")
.SetString("keywords", "john")
.List();
and the generated SQL is perfect:
select searchname0_.Id as Id4_,
searchname0_.Name as Name4_
from Search_Name searchname0_
where contains(searchname0_.Name, 'john' /* #p0 */)
The next challenge was to implement the Linq to HQL generator:
public class MyLinqtoHqlGeneratorsRegistry :
DefaultLinqToHqlGeneratorsRegistry
{
public MyLinqtoHqlGeneratorsRegistry()
{
this.Merge(new ContainsGenerator());
}
}
public class ContainsGenerator : BaseHqlGeneratorForMethod
{
public ContainsGenerator()
{
SupportedMethods = new[] {
ReflectionHelper.GetMethodDefinition<SearchName>(d => d.Name.Contains(String.Empty))
};
}
public override HqlTreeNode BuildHql(MethodInfo method,
System.Linq.Expressions.Expression targetObject,
ReadOnlyCollection<System.Linq.Expressions.Expression> arguments,
HqlTreeBuilder treeBuilder, IHqlExpressionVisitor visitor)
{
return treeBuilder.MethodCall("contains",
visitor.Visit(targetObject).AsExpression(),
visitor.Visit(arguments[0]).AsExpression()
);
}
}
}
Calling the method like this:
var namesLinq = Session.Query<SearchName>().Where(x=> x.Name.Contains("john")).ToList();
Unfortunately, this doesn't seem to override the built-in Contains method, and the generated SQL is wrong:
select searchname0_.Id as Id4_,
searchname0_.Name as Name4_
from Search_Name searchname0_
where searchname0_.Name like ('%' + 'john' /* #p0 */ + '%')
Is it not possible to override the default Contains method, or have I just made a silly mistake?
PS - I'm using NHibernate 3.3.1.4000
OK, I've finally figured it out!
First, I managed to delete the registration code from my configuration:
...
.ExposeConfiguration(cfg =>
{
cfg.LinqToHqlGeneratorsRegistry<MyLinqtoHqlGeneratorsRegistry>();
...
}
Second, don't try to override the existing Linq behaviors. I moved my Contains extension method to the full-text class.
Third, build the Hql tree correctly.
For others trying to implement a SQL 2008 Free-text contains search, here's the complete implementation:
public static class DialectExtensions
{
public static bool Contains(this SearchName sn, string searchString)
{
// this is just a placeholder for the method info.
// It does not otherwise matter.
return false;
}
}
public class MyLinqtoHqlGeneratorsRegistry : DefaultLinqToHqlGeneratorsRegistry
{
public MyLinqtoHqlGeneratorsRegistry()
: base()
{
RegisterGenerator(ReflectionHelper.GetMethod(() =>
DialectExtensions.Contains(null, null)),
new ContainsGenerator());
}
}
public class ContainsGenerator : BaseHqlGeneratorForMethod
{
string fullTextFieldName = "Name";
public ContainsGenerator()
: base()
{
SupportedMethods = new[] {
ReflectionHelper.GetMethodDefinition(() =>
DialectExtensions.Contains(null, null))
};
}
public override HqlTreeNode BuildHql(MethodInfo method,
System.Linq.Expressions.Expression targetObject,
ReadOnlyCollection<System.Linq.Expressions.Expression> arguments,
HqlTreeBuilder treeBuilder, IHqlExpressionVisitor visitor)
{
// cannot figure out how to interrogate the model class to get an
// arbitrary field name...
// perhaps the RegisterGenerator() call above could be used to pass a
// property name to the ContainsGenerator constructor?
// in our case, we only have one full text searchable class, and its
// full-text searchable field is "Name"
HqlExpression[] args = new HqlExpression[2] {
treeBuilder.Ident(fullTextFieldName).AsExpression(),
visitor.Visit(arguments[1]).AsExpression()
};
return treeBuilder.BooleanMethodCall("contains", args);
}
}
For the above to work, you must have declared and used your custom dialect:
public class CustomMsSql2008Dialect : NHibernate.Dialect.MsSql2008Dialect
{
public CustomMsSql2008Dialect()
{
RegisterFunction(
"contains",
new StandardSQLFunction("contains", null)
);
}
}
Then you can use your new contains search this way:
var namesLinq = Session.Query<SearchName>().Where(x => x.Contains("john")).ToList();
... and the resulting SQL is perfect! (at least if you only have one table you're performing full-text searches on)
EDIT: UPDATED IMPLEMENTATION TO SUPPORT MORE THAN ONE FULLTEXT 'Contains' SEARCH PER QUERY.
Here's the revised version:
public static class DialectExtensions
{
public static bool FullTextContains(this string source, string pattern)
{
return false;
}
}
public class MyLinqtoHqlGeneratorsRegistry : DefaultLinqToHqlGeneratorsRegistry
{
public MyLinqtoHqlGeneratorsRegistry()
: base()
{
RegisterGenerator(ReflectionHelper.GetMethod(() => DialectExtensions.FullTextContains(null, null)),
new FullTextContainsGenerator());
}
}
public class FullTextContainsGenerator : BaseHqlGeneratorForMethod
{
public FullTextContainsGenerator()
{
SupportedMethods = new[] { ReflectionHelper.GetMethod(() => DialectExtensions.FullTextContains(null, null)) };
}
public override HqlTreeNode BuildHql(MethodInfo method,
System.Linq.Expressions.Expression targetObject,
ReadOnlyCollection<System.Linq.Expressions.Expression> arguments,
HqlTreeBuilder treeBuilder, IHqlExpressionVisitor visitor)
{
HqlExpression[] args = new HqlExpression[2] {
visitor.Visit(arguments[0]).AsExpression(),
visitor.Visit(arguments[1]).AsExpression()
};
return treeBuilder.BooleanMethodCall("contains", args);
}
}
To use the revised version, the syntax is slightly different:
var namesLinq = Session.Query<SearchName>().Where(x => x.Name.FullTextContains("john")).ToList();
I have a partial class to extend one of my LinqToSql classes. In this partial class I have the following calculated field.
public bool IsInCluster
{
get
{
return Cluster != null;
}
}
In order for a grid column databound to this field to update automatically I have implemented the following partial method.
partial void OnClusterIDChanged()
{
SendPropertyChanged("IsInCluster");
}
However when I update the Cluster property as shown in the following code the OnClusterIDChanged method does not get called:
private void ExecCreateClusterCommand()
{
var cluster = new Cluster()
{
ID = Guid.NewGuid(),
MailService = AppState.CurrentMailService
};
App.DataContext.Clusters.InsertOnSubmit(cluster);
foreach (DeliveryPoint deliveryPoint in SelectedDeliveryPoints)
{
deliveryPoint.Cluster = cluster;
}
App.DataContext.SubmitChanges();
}
I have successfully used this technique with other non navigation properties related to calculated fields. Is there a way to make this work?
In your setter for Cluster, call OnClusterIDChanged, if the state has changed.
The only solution I could find for this was to create a public method in the DeliveryPoint class enabling me to call SendPropertyChanged for the required field (navigation property):
public void CallSendPropertyChanged(string propertyName)
{
SendPropertyChanged(propertyName);
}