AjaxGrid (Project Wonder Reference Documentation)

java.lang.Object
- com.webobjects.appserver.WOElement
- - com.webobjects.appserver.WOComponent
  - - er.ajax.AjaxGrid

All Implemented Interfaces:: WOActionResults, NSKeyValueCoding, NSKeyValueCoding.ErrorHandling, NSKeyValueCodingAdditions, NSValidation, Serializable, Cloneable

public class AjaxGrid
extends WOComponent

Ajax powered grid based on HTML Table that provides drag and drop column re-ordering, complex sorting, and the ability to embed components in cells. Class names and spans are used extensively to allow the display to be heavily customized with CSS.

The data is taken from a WODisplayGroup. Use er.extensions.ERXBatchingDisplayGroup to provide high performance access to large data sets.

Navigation between batches is not implemented as implementing in it another component bound to the display group will allow for a more flexible UI.

Configuration

Configuration is provided by an NSMutableDictionary and NSMutableArray data structure. This reduces the number of bindings, eases keeping related lists of information in synch, and provides an easy path for serializing a user's customizations to configuration for persistent storage. Described as a plist, the format of the configuration information is:

   {
        tableID = "exampleAjaxGrid";                // Goes on main table tag
        updateContainerID = "ajaxGridContainer";    // Goes on div wrapping table, used with AjaxUpdate* components
        updateFrequency = 60;                                 // Optional frequency of automatic updates of the grid contents
                                                              // This function uses the Ajax.PeriodicalUpdater which does an
                                                              // update when it is first created, rather than waiting for the 
                                                              // frequency time before making the first request
        cssClass = "ajaxGrid";                      // CSS class attribute on main table tag, optional
        cssStyle = "border: thin solid #000000;";   // CSS style attribute on main table tag, optional
        evenRowCSSClass = "yellowBackground";       // CSS class attribute on even rows, optional
        oddRowCSSClass = "greyBackground";          // CSS class attribute on odd rows, optional
        evenRowCSSStyle = "background:lightyellow;" // CSS style attribute on even rows, optional
        oddRowCSSStyle = "background:lightgrey;";   // CSS style attribute on odd rows, optional
        showRowSelector = true;                               // Optional, defaults to true, if false no UI is shown to select a row - the cell has only &nbsp;
        selectedRowCSSClass = "yellowBackground";   // Secondary CSS class attribute on selected rows, optional
        unselectedRowCSSClass = "greyBackground";   // Secondary CSS class attribute on unselected rows, optional
        selectedRowCSSStyle = "background:lightyellow;"; // Secondary CSS style attribute on selected rows, optional
        unselectedRowCSSStyle = "background:lightgrey;";// Secondary CSS style attribute on unselected rows, optional
        canReorder = true;                                    // Optional, defaults to true, Enables (or disables) drag and drop reordering of columns
        canResort = true;                                     // Optional, defaults to true, Enables (or disables) sorting by clicking the column titles
        dragHeaderOnly = true;                                // Optional, defaults to false, true if only the title/header cells can
                                                              // be dragged to re-order columns
        batchSize = 10;                                       // Controls size of batch in display group, use zero for no batching
        rowIdentifier = adKey;                                // Optional, key path into row returning a unique identifier for the row 
                                                              // rowIdentifier is used to build HTML ID attributes, so a String or Number works best
        er.extensions.ERXWORepetition.checkHashCodes = true;  // Optional override for global ERXWORepetition setting
        
  
        columns = (                                           // List of columns to display, controls the initial display order
            {
                title = "Name";                     // Title for this column in the table header row
                keyPath = "fullName";               // Key path into row returning the data to display in this colunmn
            },                                                // keyPath is optional if component is specified
            {
                title = "Department";
                keyPath = "department.name";
                sortPath = "department.code";       // sortPath is an optional path to sort this column on, defaults to keyPath
                                                              // This is useful if keyPath points to something that can't be sorted or a
                                                              // different sort order is need, e.g. here by Department Code rather than name.
                                                              // It can also be used when component is used to provide a sorting for the column
            },
            {
                title = "Hire Date";
                keyPath = "hireDate";
                formatterClass = "com.webobjects.foundation.NSTimestampFormatter"; // Class of formatter to apply to values in this column
                formatPattern = "%m/%d/%y";         // Optional pattern if needed by formatter
            },
            {
                title = "Salary";
                keyPath = "salary";
                formatterClass = "com.webobjects.foundation.NSNumberFormatter";
                formatPattern = "$###,##0.00";
                cssClass = "alignRight";            // CSS class attribute td tag in this column, optional
            },
            {
                title = "Vacation Days";
                keyPath = "daysVacation";
                formatterClass = "com.webobjects.foundation.NSNumberFormatter";
                cssStyle = "text-align: right;";    // CSS style attribute td tag in this column, useful for text-align and width, optional
            },
            {
                title =  "Actions";
                keyPath = "";                       // Missing or empty keypath results in the current object itself being passed to component
                component = "EmployeeActions";      // Name of WOComponent to be displayed in this column.  Gets passed two bindings: value (Object), 
                                                              // and grid (AjaxGrid) so that any other needed data can be accessed
                cssClass = "alignCenter";
            }
        );
        sortOrder = (
            {
                keyPath = "department.code";        // If the related column definition uses sortPath, this keyPath should match it
                                                              // This was left as keyPath (rather than sortPath) for backwards compatibility
                direction = "ascending";
            },
            {
                keyPath = "salary";
                direction = "descending";
            },
            {
                keyPath = "daysVacation";
                direction = "ascending";
            }
        );                                                                                                      // This sort is always present so that if the grid is sorted with some ordering where
        mandatorySort = {                                                                               // identical values span multiple batches, batch membership will not be indeterminate. 
              keyPath = "masterAdKey";                                              // This will only function if this sorting is quite unique (e.g. like a PK).
              direction = "ascending";                                                  // If this sort is also present in sortOrder (above), it will not be duplicated
        };                                                                                                      // but will still always be present. If the user has not manually selected it,
                                                                                                                        // it will not be indicated in the UI.
  }

Initializing Configuration From a File

You can get the configuration information from a plist file with code like this:

 public NSMutableDictionary configData() {
        if (configData == null) {
                // Get data from user preferences here if available, otherwise load the defaults
                configData = mySession().user().preferencesFor("AjaxGridExample");
                if (configData == null) {
                        NSData data = new NSData(application().resourceManager().bytesForResourceNamed("AjaxGridExampleConfiguration.plist", null, NSArray.EmptyArray));
                        configData = new NSMutableDictionary((NSDictionary) NSPropertyListSerialization.propertyListFromData(data, "UTF-8"));
                }
        }
 
        return configData;
 }

Updating the Grid From a Different Component

When the grid contents are updated the AjaxUpdateContainer needs to be updated. The grid configuration updateContainerID gives the ID for this. This can be used as the updateContainerID in a AjaxUpdateLink or <updateContainerID>Update() can be called directly. This results in a call to ajaxGrid_init('<tableID>'); to be re-enable drag and drop on the table.

Here is an example. In this example, updateContainerID is used to update the grid, and then the NavBar container is updated manually from onComplete. The reason for this is that the grid needs to update first so that the correct values are available for updating the NavBar.

Relevant Configuration:

   {
      tableID = "exampleAjaxGrid";
      updateContainerID = "ajaxGridContainer";
      . . .

WOD Bindings:

   NavUpdater: AjaxUpdateContainer {
       id = "NavBar";
   }
   
   NextBatch : AjaxUpdateLink {
       action = nextBatch;
       updateContainerID = "ajaxGridContainer";
       onComplete = "function(request) { NavBarUpdate(); }";
   }

CSS Classes Used by AjaxGrid

In addition to the classes defined in the grid configuration, AjaxGrid uses some set class names:

Class Name	Used For
ajaxGridRemoveSorting	The th of cell containing link to remove all sorting
ajaxGridColumnTitle	The th of cells containing column titles
ajaxGridSortAscending	The span that wraps index and direction indicator of columns sorted in ascending order
ajaxGridSortDescending	The span that wraps index and direction indicator of columns sorted in descending order
ajaxGridSelectRow	The td of cells containing the row selection link

Advanced Styling of the Grid

The grid contains several places were there are nested anonymous span tags wrapping default text content. These are there so that the span wrapping the default content can be set to display: none and the content of the outer div given in CSS. For this HTML:

   <th class="ajaxGridRemoveSorting"><span>X</span><em>&nbsp;</em></th>

The default X can replaced with an image with this CSS:

   th.ajaxGridRemoveSorting a span {display: none;}
   th.ajaxGridRemoveSorting a  em {     
      background-image: url(http://vancouver.global-village.net/WebObjects/Frameworks/JavaDirectToWeb.framework/WebServerResources/trashcan-btn.gif);
      background-repeat:no-repeat;
      padding-right: 12px;
      padding-bottom: 5px;
   }

You can also use content to replace the span content with text if your browser (not IE) supports it.

Updating the Configuration

If you update the configuration after the grid has been displayed, some items will not update as the information is cached. Add a value under the key AjaxGrid.CONFIGURATION_UPDATED to notify the grid to discard the cached information. The grid will remove the value under this key after it has cleared the cache.

To Do

wrap JavaScript in function literal for namespace protection
drag ghost of column instead of changing column background color when dragging. See reference.
support multiple grids on a single page
make stateless
allow auto configuration from .woo file
allow sorting to be enabled / disabled

See Also:: Serialized Form
Author:: chill

Bindings
Name	Description
`displayGroup`	required, WODisplayGroup acting as source and batching engine for the data to be displayed
`configurationData`	required, NSMutableDictionary used to configure grid, see documentation for details
`selectedObjects`	optional, NSMutableArray list of rows that the user has selected from the grid
`willUpdate`	optional, Ajax action method called when the AjaxUpdateContainer is being updated, but before it renders its content
`afterUpdate`	optional, JavaScript to execute client-side after the grid has updated
`updateContainerParameters`	optional, passed as parameters binding to the AjaxUpdateContainer wrapping the grid

Properties
Name	Description
`er.extensions.ERXWORepetition.checkHashCodes`	er.extensions.ERXWORepetition.checkHashCodes

Nested Class Summary
- Nested classes/interfaces inherited from class com.webobjects.appserver.WOComponent
  WOComponent._EventLoggingEnabler, WOComponent.Event
- Nested classes/interfaces inherited from interface com.webobjects.foundation.NSKeyValueCodingAdditions
  NSKeyValueCodingAdditions.DefaultImplementation, NSKeyValueCodingAdditions.Utility
- Nested classes/interfaces inherited from interface com.webobjects.foundation.NSKeyValueCoding
  NSKeyValueCoding._BooleanFieldBinding, NSKeyValueCoding._BooleanMethodBinding, NSKeyValueCoding._FieldBinding, NSKeyValueCoding._ForwardingBinding, NSKeyValueCoding._KeyBinding, NSKeyValueCoding._KeyBindingCreation, NSKeyValueCoding._MethodBinding, NSKeyValueCoding._NumberFieldBinding, NSKeyValueCoding._NumberMethodBinding, NSKeyValueCoding._ReflectionKeyBindingCreation, NSKeyValueCoding.ErrorHandling, NSKeyValueCoding.MapImplementation, NSKeyValueCoding.Null<T>, NSKeyValueCoding.UnknownKeyException, NSKeyValueCoding.ValueAccessor
- Nested classes/interfaces inherited from interface com.webobjects.foundation.NSValidation
  NSValidation._MethodBinding, NSValidation._ValidationBinding, NSValidation.DefaultImplementation, NSValidation.Utility, NSValidation.ValidationException

Field Summary

Fields
Modifier and Type	Field and Description
`static String`	`AFTER_UPDATE_BINDING`
`static String`	`BATCH_SIZE`
`static String`	`CAN_REORDER`
`static String`	`CAN_RESORT`
`static String`	`CHECK_HASH_CODES`
`static String`	`COLUMNS`
`static String`	`COMPONENT_NAME`
`static String`	`CONFIGURATION_DATA_BINDING`
`static String`	`CONFIGURATION_UPDATED`
`static String`	`DESTINATION_COLUMN_FORM_VALUE`
`static String`	`DISPLAY_GROUP_BINDING`
`static String`	`DRAG_HEADER_ONLY`
`static String`	`EVEN_ROW_CSS_CLASS`
`static String`	`EVEN_ROW_CSS_STYLE`
`static String`	`FORMAT_PATTERN`
`static String`	`FORMATTER_CLASS`
`static String`	`KEY_PATH`
`static String`	`MANDATORY_SORT`
`static String`	`MANDATORY_SORT_ORDER_FLAG`
`static String`	`ODD_ROW_CSS_CLASS`
`static String`	`ODD_ROW_CSS_STYLE`
`static String`	`ROW_IDENTIFIER`
`static String`	`SELECTED_OBJECTS_BINDING`
`static String`	`SELECTED_ROW_CSS_CLASS`
`static String`	`SELECTED_ROW_CSS_STYLE`
`static String`	`SHOW_ROW_SELECTOR`
`static String`	`SORT_ASCENDING`
`static String`	`SORT_DESCENDING`
`static String`	`SORT_DIRECTION`
`static String`	`SORT_ORDER`
`static String`	`SORT_PATH`
`static String`	`SOURCE_COLUMN_FORM_VALUE`
`static String`	`TABLE_ID`
`static String`	`TITLE`
`static String`	`UNSELECTED_ROW_CSS_CLASS`
`static String`	`UNSELECTED_ROW_CSS_STYLE`
`static String`	`UPDATE_CONTAINER_ID`
`static String`	`UPDATE_FREQUENCY`
`static String`	`WILL_UPDATE_BINDING`

Fields inherited from class com.webobjects.appserver.WOComponent
_Extension, _IsEventLoggingEnabled, _keyAssociations

Fields inherited from interface com.webobjects.foundation.NSKeyValueCoding.ErrorHandling
_CLASS

Fields inherited from interface com.webobjects.foundation.NSKeyValueCodingAdditions
_CLASS, _KeyPathSeparatorChar, KeyPathSeparator

Fields inherited from interface com.webobjects.foundation.NSKeyValueCoding
NullValue

Fields inherited from interface com.webobjects.foundation.NSValidation
_CLASS

Constructor Summary

Constructors
Constructor and Description

AjaxGrid(WOContext context)

Constructors
Constructor and Description
`AjaxGrid(WOContext context)`

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`String`	`afterUpdate()` Binding value for onRefreshComplete function of AjaxUpdate container.
`void`	`appendToResponse(WOResponse response, WOContext context)` Adds movecolumns.js to the header.
`protected int`	`batchSize()` Returns BATCH_SIZE value from configurationData()
`boolean`	`canReorder()` Returns CAN_REORDER value from configurationData(), or `true` if not configured.
`boolean`	`canResort()` Returns CAN_RESORT value from configurationData(), or `true` if not configured.
`boolean`	`checkHashCodes()` Allows configuration data to override ERXWORepetition default for checkHashCodes.
`protected void`	`clearCachedConfiguration()` Clears local cache of configuration data so that fresh data will be cached.
`String`	`columnComponentName()`
`Format`	`columnFormatter()`
`void`	`columnOrderUpdated()` Ajax action method for when columns are dragged and dropped.
`protected NSMutableArray`	`columns()` Returns COLUMNS value from configurationData()
`NSMutableDictionary`	`columnsByKeypath()`
`Object`	`columnValue()`
`NSMutableDictionary`	`configurationData()`
`void`	`containerUpdated()` This method is called when the AjaxUpdateContainer is about to update.
`NSDictionary`	`currentColumn()` Cover method for item binding of a WORepetition.
`String`	`currentColumnID()`
`int`	`currentColumnSortIndex()`
`NSMutableDictionary`	`currentColumnSortOrder()`
`String`	`currentKeyPath()`
`String`	`currentSortPath()`
`WODisplayGroup`	`displayGroup()`
`String`	`dragHeaderOnly()`
`String`	`enableDragAndDrop()` Returns Javacript to (re)initialize drag and drop on the grid.
`NSMutableDictionary`	`formattersByKeypath()`
`boolean`	`hasMandatorySort()`
`String`	`initScript()` Script that goes on this page to initialize drag and drop on the grid when the page loads / re-loads
`boolean`	`isCurrentColumnSorted()`
`boolean`	`isCurrentColumnSortedAscending()`
`boolean`	`isRowSelected()`
`NSDictionary`	`manadatorySortDictionary()` Returns a copy of the mandatory sort configuration with an additional (dummy) value for the MANDATORY_SORT_ORDER_FLAG.
`String`	`manadatorySortKeyPath()`
`void`	`removeSorting()` Ajax action method for when control clicked to remove all sorting.
`String`	`removeSortingID()`
`NSKeyValueCodingAdditions`	`row()` Cover method for item binding of a WORepetition.
`String`	`rowClass()` Returns EVEN_ROW_CSS_CLASS or ODD_ROW_CSS_CLASS, depending on rowIndex(), value from configurationData() followed by SELECTED_ROW_CSS_CLASS or UNSELECTED_ROW_CSS_CLASS, depending on isRowSelected(), value from configurationData()
`String`	`rowID()` Returns a value suitable for use as part of an HTML ID attribute that uniquely identifies this row.
`String`	`rowIdentifier()` Returns an optional key path into row that will return a value that uniquely identifies this row.
`String`	`rowIdentifierKey()` Returns a key into this row that produces a unique value for this row.
`int`	`rowIndex()` Cover method for index binding of a WORepetition.
`String`	`rowStyle()` Returns EVEN_ROW_CSS_STYLE or ODD_ROW_CSS_STYLE, depending on rowIndex(), value from configurationData() folowed by SELECTED_ROW_CSS_STYLE or UNSELECTED_ROW_CSS_STYLE, depending on isRowSelected(), value from configurationData()
`NSMutableArray`	`selectedObjects()` This list is implemented by AjaxGrid and is not based on the display group's selected objects.
`void`	`setColumnValue(Object value)` Method used with automatic synchronizing custom components.
`void`	`setCurrentColumn(NSDictionary newColumn)` Cover method for item binding of a WORepetition.
`void`	`setRow(NSKeyValueCodingAdditions newRow)` Cover method for item binding of a WORepetition.
`void`	`setRowIndex(int index)` Cover method for index binding of a WORepetition.
`boolean`	`showRowSelector()`
`protected NSMutableArray`	`sortOrders()` Returns SORT_ORDER value from configurationData()
`NSMutableDictionary`	`sortOrdersByKeypath()`
`void`	`sortOrderUpdated()` Ajax action method for when column titles are clicked to change sorting.
`boolean`	`synchronizesVariablesWithBindings()`
`String`	`tableID()` Returns TABLE_ID value from configurationData()
`AjaxGrid`	`thisComponent()`
`void`	`toggleRowSelection()` Toggles inclusion of row into selectedObjects() (i.e.
`String`	`toggleRowSelectionID()`
`protected void`	`updateBatchSize()` Updates numberOfObjectsPerBatch on the display group
`static void`	`updateBatchSize(WODisplayGroup dg, int batchSize)` Updates numberOfObjectsPerBatch on the display group.
`protected void`	`updateDisplayGroupSort()` Updates sort orders on the display group.
`static void`	`updateDisplayGroupSort(WODisplayGroup dg, NSArray sortConfig)` Updates sort orders on the display group.

Methods inherited from class com.webobjects.appserver.WOComponent
__valueForBinding, _associationWithName, _awakeInContext, _childTemplate, _cleanUpStatelessComponent, _componentDefinition, _componentUnroll, _isPage, _setContext, _setIsPage, _setParent, _setSubcomponent, _sleepInContext, _subcomponentForElementWithID, _templateNameForClass, _unroll, application, awake, baseURL, bindingKeys, canAccessFieldsDirectly, canGetValueForBinding, canSetValueForBinding, clone, context, debugString, descriptionForResponse, ensureAwakeInContext, frameworkName, generateResponse, handleQueryWithUnboundKey, handleTakeValueForUnboundKey, hasBinding, hasSession, invokeAction, isCachingEnabled, isEventLoggingEnabled, isStateless, logString, name, pageWithName, parent, path, pathURL, performParentAction, pullValuesFromParent, pushValuesToParent, reset, session, set_componentUnroll, set_unroll, setCachingEnabled, setValueForBinding, setVariableValueForName, sleep, takeValueForKey, takeValueForKeyPath, takeValuesFromRequest, template, templateWithHTMLString, templateWithHTMLString, templateWithHTMLString, templateWithName, toString, unableToSetNullForKey, validateTakeValueForKeyPath, validateValueForKey, validationFailedWithException, valueForBinding, valueForBooleanBinding, valueForIntegerBinding, valueForKey, valueForKeyPath, valueForNSArrayBindings, valueForNSDictionaryBindings, valueForNumberBinding, valueForStringBinding, variableValueForName, variableWithName

Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - TITLE
```
public static final String TITLE
```
    See Also:
    
    Constant Field Values
  - KEY_PATH
```
public static final String KEY_PATH
```
    See Also:
    
    Constant Field Values
  - SORT_PATH
```
public static final String SORT_PATH
```
    See Also:
    
    Constant Field Values
  - SORT_DIRECTION
```
public static final String SORT_DIRECTION
```
    See Also:
    
    Constant Field Values
  - SORT_ASCENDING
```
public static final String SORT_ASCENDING
```
    See Also:
    
    Constant Field Values
  - SORT_DESCENDING
```
public static final String SORT_DESCENDING
```
    See Also:
    
    Constant Field Values
  - SORT_ORDER
```
public static final String SORT_ORDER
```
    See Also:
    
    Constant Field Values
  - COLUMNS
```
public static final String COLUMNS
```
    See Also:
    
    Constant Field Values
  - BATCH_SIZE
```
public static final String BATCH_SIZE
```
    See Also:
    
    Constant Field Values
  - UPDATE_CONTAINER_ID
```
public static final String UPDATE_CONTAINER_ID
```
    See Also:
    
    Constant Field Values
  - TABLE_ID
```
public static final String TABLE_ID
```
    See Also:
    
    Constant Field Values
  - ROW_IDENTIFIER
```
public static final String ROW_IDENTIFIER
```
    See Also:
    
    Constant Field Values
  - CAN_REORDER
```
public static final String CAN_REORDER
```
    See Also:
    
    Constant Field Values
  - CAN_RESORT
```
public static final String CAN_RESORT
```
    See Also:
    
    Constant Field Values
  - DRAG_HEADER_ONLY
```
public static final String DRAG_HEADER_ONLY
```
    See Also:
    
    Constant Field Values
  - SOURCE_COLUMN_FORM_VALUE
```
public static final String SOURCE_COLUMN_FORM_VALUE
```
    See Also:
    
    Constant Field Values
  - DESTINATION_COLUMN_FORM_VALUE
```
public static final String DESTINATION_COLUMN_FORM_VALUE
```
    See Also:
    
    Constant Field Values
  - FORMATTER_CLASS
```
public static final String FORMATTER_CLASS
```
    See Also:
    
    Constant Field Values
  - FORMAT_PATTERN
```
public static final String FORMAT_PATTERN
```
    See Also:
    
    Constant Field Values
  - EVEN_ROW_CSS_CLASS
```
public static final String EVEN_ROW_CSS_CLASS
```
    See Also:
    
    Constant Field Values
  - ODD_ROW_CSS_CLASS
```
public static final String ODD_ROW_CSS_CLASS
```
    See Also:
    
    Constant Field Values
  - EVEN_ROW_CSS_STYLE
```
public static final String EVEN_ROW_CSS_STYLE
```
    See Also:
    
    Constant Field Values
  - ODD_ROW_CSS_STYLE
```
public static final String ODD_ROW_CSS_STYLE
```
    See Also:
    
    Constant Field Values
  - SHOW_ROW_SELECTOR
```
public static final String SHOW_ROW_SELECTOR
```
    See Also:
    
    Constant Field Values
  - SELECTED_ROW_CSS_CLASS
```
public static final String SELECTED_ROW_CSS_CLASS
```
    See Also:
    
    Constant Field Values
  - UNSELECTED_ROW_CSS_CLASS
```
public static final String UNSELECTED_ROW_CSS_CLASS
```
    See Also:
    
    Constant Field Values
  - SELECTED_ROW_CSS_STYLE
```
public static final String SELECTED_ROW_CSS_STYLE
```
    See Also:
    
    Constant Field Values
  - UNSELECTED_ROW_CSS_STYLE
```
public static final String UNSELECTED_ROW_CSS_STYLE
```
    See Also:
    
    Constant Field Values
  - CONFIGURATION_UPDATED
```
public static final String CONFIGURATION_UPDATED
```
    See Also:
    
    Constant Field Values
  - COMPONENT_NAME
```
public static final String COMPONENT_NAME
```
    See Also:
    
    Constant Field Values
  - UPDATE_FREQUENCY
```
public static final String UPDATE_FREQUENCY
```
    See Also:
    
    Constant Field Values
  - DISPLAY_GROUP_BINDING
```
public static final String DISPLAY_GROUP_BINDING
```
    See Also:
    
    Constant Field Values
  - CONFIGURATION_DATA_BINDING
```
public static final String CONFIGURATION_DATA_BINDING
```
    See Also:
    
    Constant Field Values
  - SELECTED_OBJECTS_BINDING
```
public static final String SELECTED_OBJECTS_BINDING
```
    See Also:
    
    Constant Field Values
  - WILL_UPDATE_BINDING
```
public static final String WILL_UPDATE_BINDING
```
    See Also:
    
    Constant Field Values
  - AFTER_UPDATE_BINDING
```
public static final String AFTER_UPDATE_BINDING
```
    See Also:
    
    Constant Field Values
  - MANDATORY_SORT_ORDER_FLAG
```
public static final String MANDATORY_SORT_ORDER_FLAG
```
    See Also:
    
    Constant Field Values
  - MANDATORY_SORT
```
public static final String MANDATORY_SORT
```
    See Also:
    
    Constant Field Values
  - CHECK_HASH_CODES
```
public static final String CHECK_HASH_CODES
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - AjaxGrid
```
public AjaxGrid(WOContext context)
```
- Method Detail
  - synchronizesVariablesWithBindings
```
public boolean synchronizesVariablesWithBindings()
```
    Overrides:
    
    synchronizesVariablesWithBindings in class WOComponent
    
    Returns:
    
    false, AjaxGrid is manually synchronized
  - appendToResponse
```
public void appendToResponse(WOResponse response,
                             WOContext context)
```
    Adds movecolumns.js to the header.
    
    Overrides:
    
    appendToResponse in class WOComponent
  - columnOrderUpdated
```
public void columnOrderUpdated()
```
    Ajax action method for when columns are dragged and dropped. Updates configurationData().
  - sortOrderUpdated
```
public void sortOrderUpdated()
```
    Ajax action method for when column titles are clicked to change sorting. Updates configurationData() and displayGroup().
  - removeSorting
```
public void removeSorting()
```
    Ajax action method for when control clicked to remove all sorting. Updates configurationData() and displayGroup().
  - removeSortingID
```
public String removeSortingID()
```
    Returns:
    
    ID to be used on AjaxUpdateLink bound to removeSorting()
  - hasMandatorySort
```
public boolean hasMandatorySort()
```
    Returns:
    
    true if the configuration has anything under the MANDATORY_SORT key
  - manadatorySortDictionary
```
public NSDictionary manadatorySortDictionary()
```
    Returns a copy of the mandatory sort configuration with an additional (dummy) value for the MANDATORY_SORT_ORDER_FLAG.
    
    Returns:
    
    a dictionary of the mandatory sort
    
    See Also:
    
    sortOrders()
  - manadatorySortKeyPath
```
public String manadatorySortKeyPath()
```
    Returns:
    
    value for KEY_PATH under MANDATORY_SORT, the path of the mandatory sort
  - containerUpdated
```
public void containerUpdated()
```
    This method is called when the AjaxUpdateContainer is about to update. It invokes the willUpdate action binding, if set, and discards the result.
  - initScript
```
public String initScript()
```
    Script that goes on this page to initialize drag and drop on the grid when the page loads / re-loads
    
    Returns:
    
    JavaScript to initialize drag and drop on the grid
  - dragHeaderOnly
```
public String dragHeaderOnly()
```
    Returns:
    
    the value for the DRAG_HEADER_ONLY configuration item with a default of false
  - afterUpdate
```
public String afterUpdate()
```
    Binding value for onRefreshComplete function of AjaxUpdate container. Returns the value from the AFTER_UPDATE_BINDING followed by enableDragAndDrop().
    
    Returns:
    
    value for AFTER_UPDATE_BINDING concatenated with enableDragAndDrop()
  - enableDragAndDrop
```
public String enableDragAndDrop()
```
    Returns Javacript to (re)initialize drag and drop on the grid.
    
    Returns:
    
    ajaxGrid_init(TABLE);
  - configurationData
```
public NSMutableDictionary configurationData()
```
    Returns:
    
    the configurationData
  - clearCachedConfiguration
```
protected void clearCachedConfiguration()
```
    Clears local cache of configuration data so that fresh data will be cached.
  - canReorder
```
public boolean canReorder()
```
    Returns CAN_REORDER value from configurationData(), or true if not configured.
    
    Returns:
    
    true if column re-ordering is enabled
  - canResort
```
public boolean canResort()
```
    Returns CAN_RESORT value from configurationData(), or true if not configured.
    
    Returns:
    
    true if data sorting is enabled
  - tableID
```
public String tableID()
```
    Returns TABLE_ID value from configurationData()
    
    Returns:
    
    HTML ID for <table> implementing the grid
  - rowIdentifier
```
public String rowIdentifier()
```
    Returns an optional key path into row that will return a value that uniquely identifies this row. This should be suitable for use as part of an HTML ID attribute.
    
    Returns:
    
    an optional key path into row that will return a value that uniquely identifies this row
  - columns
```
protected NSMutableArray columns()
```
    Returns COLUMNS value from configurationData()
    
    Returns:
    
    list of configuration for the columns to display in the grid
  - sortOrders
```
protected NSMutableArray sortOrders()
```
    Returns SORT_ORDER value from configurationData()
    
    Returns:
    
    list of sort orders controlling display of data in the grid
  - batchSize
```
protected int batchSize()
```
    Returns BATCH_SIZE value from configurationData()
    
    Returns:
    
    batch size for the display grid
  - rowClass
```
public String rowClass()
```
    Returns EVEN_ROW_CSS_CLASS or ODD_ROW_CSS_CLASS, depending on rowIndex(), value from configurationData() followed by SELECTED_ROW_CSS_CLASS or UNSELECTED_ROW_CSS_CLASS, depending on isRowSelected(), value from configurationData()
    
    Returns:
    
    CSS class for this row
  - rowStyle
```
public String rowStyle()
```
    Returns EVEN_ROW_CSS_STYLE or ODD_ROW_CSS_STYLE, depending on rowIndex(), value from configurationData() folowed by SELECTED_ROW_CSS_STYLE or UNSELECTED_ROW_CSS_STYLE, depending on isRowSelected(), value from configurationData()
    
    Returns:
    
    CSS class for this row
  - rowID
```
public String rowID()
```
    Returns a value suitable for use as part of an HTML ID attribute that uniquely identifies this row. If rowIdentifier() is set, used row().valueForKeyPath(rowIdentifier()), otherwise uses "row_" and the index of the row in the list of objects.
    
    Returns:
    
    a value suitable for use as part of an HTML ID attribute that uniquely identifies this row
  - rowIdentifierKey
```
public String rowIdentifierKey()
```
    Returns a key into this row that produces a unique value for this row.
    
    Returns:
    
    a key into this row that produces a unique value for this row
  - columnsByKeypath
```
public NSMutableDictionary columnsByKeypath()
```
    Returns:
    
    dictionary of columns() keyed on KEY_PATH of column
  - sortOrdersByKeypath
```
public NSMutableDictionary sortOrdersByKeypath()
```
    Returns:
    
    dictionary of sortOrders() keyed on KEY_PATH of column
  - formattersByKeypath
```
public NSMutableDictionary formattersByKeypath()
```
    Returns:
    
    dictionary of formatters for columns() keyed on KEY_PATH of column
  - updateDisplayGroupSort
```
public static void updateDisplayGroupSort(WODisplayGroup dg,
                                          NSArray sortConfig)
```
    Updates sort orders on the display group. This is public and static so that a display group can be pre-configured for the AjaxGrid to avoid re-fetching (happens if there is a nav bar that gets rendered before the grid).
    
    Parameters:
    
    dg - the WODisplayGroup to set the sortOrderings of
    
    sortConfig - NSArray of sorts from grid configuration (not EOSortOrderings)
  - updateDisplayGroupSort
```
protected void updateDisplayGroupSort()
```
    Updates sort orders on the display group.
  - updateBatchSize
```
public static void updateBatchSize(WODisplayGroup dg,
                                   int batchSize)
```
    Updates numberOfObjectsPerBatch on the display group. This is public and static so that a display group can be pre-configured for the AjaxGrid to avoid re-fetching (happens if there is a nav bar that gets rendered before the grid).
    
    Parameters:
    
    dg - the WODisplayGroup to set the sortOrderings of
    
    batchSize - batch size from grid configuration (not EOSortOrderings)
  - updateBatchSize
```
protected void updateBatchSize()
```
    Updates numberOfObjectsPerBatch on the display group
  - displayGroup
```
public WODisplayGroup displayGroup()
```
    Returns:
    
    the displayGroup
  - currentColumnID
```
public String currentColumnID()
```
    Returns:
    
    ID to be used on AjaxUpdateLink bound to sortOrderUpdated() for currentColumn()
  - isCurrentColumnSorted
```
public boolean isCurrentColumnSorted()
```
    Returns:
    
    true if currentColumn() is part of the sort ordering but is not the mandatory sort
  - currentColumnSortOrder
```
public NSMutableDictionary currentColumnSortOrder()
```
    Returns:
    
    the sort order dictionary for currentColumn() or null if ! isCurrentColumnSorted()
  - isCurrentColumnSortedAscending
```
public boolean isCurrentColumnSortedAscending()
```
    Returns:
    
    true if currentColumn() is part of the sort ordering and is being sorted in ascending order
  - currentColumnSortIndex
```
public int currentColumnSortIndex()
```
    Returns:
    
    the index (1 based) of this columns precedence in sorting or -1 if it is not part of the sort order
  - columnValue
```
public Object columnValue()
```
    Returns:
    
    the value from row() corresponding to currentColumn(), formatted as configured
  - setColumnValue
```
public void setColumnValue(Object value)
```
    Method used with automatic synchronizing custom components.
    
    Parameters:
    
    value - new value for row() in this column
  - columnFormatter
```
public Format columnFormatter()
```
    Returns:
    
    the value from row() corresponding to currentColumn()
  - currentKeyPath
```
public String currentKeyPath()
```
    Returns:
    
    the keyPath value from currentColumn()
  - currentSortPath
```
public String currentSortPath()
```
    Returns:
    
    the sortPath value from currentColumn() or currentKeyPath() if not found
  - columnComponentName
```
public String columnComponentName()
```
    Returns:
    
    the name of the WOComponent to use to display the value from currentColumn()
  - showRowSelector
```
public boolean showRowSelector()
```
    Returns:
    
    value of SHOW_ROW_SELECTOR from the configuration data, or true if unset
  - selectedObjects
```
public NSMutableArray selectedObjects()
```
    This list is implemented by AjaxGrid and is not based on the display group's selected objects. The list of selected objects is maintained across all batches.
    
    Returns:
    
    list of user selected objects
  - toggleRowSelection
```
public void toggleRowSelection()
```
    Toggles inclusion of row into selectedObjects() (i.e. selects and de-selects it).
  - toggleRowSelectionID
```
public String toggleRowSelectionID()
```
    Returns:
    
    ID to be used on AjaxUpdateLink bound to toggleRowSelection()
  - isRowSelected
```
public boolean isRowSelected()
```
    Returns:
    
    true if row() is in selectedObjects()
  - currentColumn
```
public NSDictionary currentColumn()
```
    Cover method for item binding of a WORepetition.
    
    Returns:
    
    the current column being rendered
  - setCurrentColumn
```
public void setCurrentColumn(NSDictionary newColumn)
```
    Cover method for item binding of a WORepetition.
    
    Parameters:
    
    newColumn - current column being rendered
  - row
```
public NSKeyValueCodingAdditions row()
```
    Cover method for item binding of a WORepetition.
    
    Returns:
    
    the current row being rendered
  - setRow
```
public void setRow(NSKeyValueCodingAdditions newRow)
```
    Cover method for item binding of a WORepetition.
    
    Parameters:
    
    newRow - current row being rendered
  - rowIndex
```
public int rowIndex()
```
    Cover method for index binding of a WORepetition.
    
    Returns:
    
    index of the current row being rendered
  - setRowIndex
```
public void setRowIndex(int index)
```
    Cover method for index binding of a WORepetition.
    
    Parameters:
    
    index - inded of current row being rendered
  - thisComponent
```
public AjaxGrid thisComponent()
```
    Returns:
    
    this component so that it can be used in bindings
  - checkHashCodes
```
public boolean checkHashCodes()
```
    Allows configuration data to override ERXWORepetition default for checkHashCodes.
    
    Returns:
    
    boolean value for CHECK_HASH_CODES if set in config data, otherwise the default from ERXWORepetition

Class AjaxGrid

Configuration

Initializing Configuration From a File

Updating the Grid From a Different Component

CSS Classes Used by AjaxGrid

Advanced Styling of the Grid

Updating the Configuration

To Do

Nested Class Summary

Nested classes/interfaces inherited from class com.webobjects.appserver.WOComponent

Nested classes/interfaces inherited from interface com.webobjects.foundation.NSKeyValueCodingAdditions

Nested classes/interfaces inherited from interface com.webobjects.foundation.NSKeyValueCoding

Nested classes/interfaces inherited from interface com.webobjects.foundation.NSValidation

Field Summary

Fields inherited from class com.webobjects.appserver.WOComponent

Fields inherited from interface com.webobjects.foundation.NSKeyValueCoding.ErrorHandling

Fields inherited from interface com.webobjects.foundation.NSKeyValueCodingAdditions

Fields inherited from interface com.webobjects.foundation.NSKeyValueCoding

Fields inherited from interface com.webobjects.foundation.NSValidation

Constructor Summary

Method Summary

Methods inherited from class com.webobjects.appserver.WOComponent

Methods inherited from class java.lang.Object

Field Detail

TITLE

KEY_PATH

SORT_PATH

SORT_DIRECTION

SORT_ASCENDING

SORT_DESCENDING

SORT_ORDER

COLUMNS

BATCH_SIZE

UPDATE_CONTAINER_ID

TABLE_ID

ROW_IDENTIFIER

CAN_REORDER

CAN_RESORT

DRAG_HEADER_ONLY

SOURCE_COLUMN_FORM_VALUE

DESTINATION_COLUMN_FORM_VALUE

FORMATTER_CLASS

FORMAT_PATTERN

EVEN_ROW_CSS_CLASS

ODD_ROW_CSS_CLASS

EVEN_ROW_CSS_STYLE

ODD_ROW_CSS_STYLE

SHOW_ROW_SELECTOR

SELECTED_ROW_CSS_CLASS

UNSELECTED_ROW_CSS_CLASS

SELECTED_ROW_CSS_STYLE

UNSELECTED_ROW_CSS_STYLE

CONFIGURATION_UPDATED

COMPONENT_NAME

UPDATE_FREQUENCY

DISPLAY_GROUP_BINDING

CONFIGURATION_DATA_BINDING

SELECTED_OBJECTS_BINDING

WILL_UPDATE_BINDING

AFTER_UPDATE_BINDING

MANDATORY_SORT_ORDER_FLAG

MANDATORY_SORT

CHECK_HASH_CODES

Constructor Detail

AjaxGrid

Method Detail

synchronizesVariablesWithBindings

appendToResponse

columnOrderUpdated

sortOrderUpdated

removeSorting

removeSortingID

hasMandatorySort

manadatorySortDictionary

manadatorySortKeyPath

containerUpdated

initScript

dragHeaderOnly

afterUpdate

enableDragAndDrop