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## 6.33. < rich:dataGrid >

### 6.33.1. Description

The component to render data as a grid that allows choosing data from a model and obtains built-in support of Ajax updates.

Figure 6.54. <rich:dataGrid> component

### 6.33.2. Key Features

- A completely skinned table and child elements

- Possibility to update a limited set of rows with AJAX

- Possibility to receive values dynamically from a model

Table 6.123. rich : dataGrid attributes

Attribute Name | Description
--- | ---
ajaxKeys | This attribute defines row keys that are updated after an AJAX request
align | Deprecated. This attribute specifies the position of the table with respect to the document. The possible values are "left", "center" and "right". The default value is "left".
bgcolor | Deprecated. This attribute sets the background color for the document body or table cells. This attribute sets the background color of the canvas for the document body (the BODY element) or for tables (the TABLE, TR, TH, and TD elements). Additional attributes for specifying text color can be used with the BODY element. This attribute has been deprecated in favor of style sheets for specifying background color information
binding | The attribute takes a value-binding expression for a component property of a backing bean
border | This attributes specifies the width of the frame around a component. Default value is "0".
captionClass | Space-separated list of CSS style class(es) that are be applied to caption for this component
captionStyle | CSS style(s) is/are to be applied to caption when this component is rendered
cellpadding | This attribute specifies the amount of space between the border of the cell and its contents. Default value is "0".
cellspacing | This attribute specifies the amount of space between the border of the cell and its contents. The attribute also specifies the amount of space to leave between cells. Default value is "0".
columnClasses | Comma-delimited list of CSS style classes that are be applied to the columns of this table. A space separated list of classes may also be specified for any individual column. If the number of elements in this list is less than the number of columns specified in the "columns" attribute, no "class" attribute is output for each column greater than the number of elements in the list. If the number of elements in the list is greater than the number of columns specified in the "columns" attribute, the elements at the position in the list after the value of the "columns" attribute are ignored
columns | Number of columns
componentState | It defines EL-binding for a component state for saving or redefinition
dir | Direction indication for text that does not inherit directionality. Valid values are "LTR" (left-to-right) and "RTL" (right-to-left)
elements | Number of elements in grid
first | A zero-relative row number of the first row to display
footerClass | Space-separated list of CSS style class(es) that are be applied to footer for this component
frame | This attribute specifies which sides of the frame surrounding a table will be visible. Possible values: "void", "above", "below", "hsides", "lhs", "rhs", "vsides", "box" and "border". The default value is "void".
headerClass | Space-separated list of CSS style class(es) that are be applied to header for this component
id | Every component may have a unique id that is automatically created if omitted
lang | Code describing the language used in the generated markup for this component
onclick | HTML: a script expression; a pointer button is clicked
ondblclick | HTML: a script expression; a pointer button is double-clicked
onkeydown | HTML: a script expression; a key is pressed down
onkeypress | HTML: a script expression; a key is pressed and released
onkeyup | HTML: a script expression; a key is released
onmousedown | HTML: script expression; a pointer button is pressed down
onmousemove | HTML: a script expression; a pointer is moved within
onmouseout | HTML: a script expression; a pointer is moved away
onmouseover | HTML: a script expression; a pointer is moved onto
onmouseup | HTML: script expression; a pointer button is released
onRowClick | HTML: a script expression; a pointer button is clicked on row
onRowDblClick | HTML: a script expression; a pointer button is double-clicked on row
onRowMouseDown | HTML: script expression; a pointer button is pressed down on row
onRowMouseMove | HTML: a script expression; a pointer is moved within of row
onRowMouseOut | HTML: a script expression; a pointer is moved away of row
onRowMouseOver | HTML: a script expression; a pointer is moved onto of row
onRowMouseUp | HTML: script expression; a pointer button is released on row
rendered | If "false", this component is not rendered
rowClasses | A comma-delimited list of CSS style classes that is applied to popup table rows. A space separated list of classes may also be specified for any individual row. The styles are applied, in turn, to each row in the table. For example, if the list has two elements, the first style class in the list is applied to the first row, the second to the second row, the first to the third row, the second to the fourth row, etc. In other words, we keep iterating through the list until we reach the end, and then we start at the beginning again
rowKey | RowKey is a representation of an identifier for a specific data row
rowKeyConverter | Converter for a row key object
rowKeyVar | Request scoped variable for client access to rowKey
rules | This attribute specifies which rules will appear between cells within a table. The rendering of rules is user agent dependent. Possible values: * none: No rules. This is the default value. * groups: Rules will appear between row groups (see THEAD, TFOOT, and TBODY) and column groups (see COLGROUP and COL) only. * rows: Rules will appear between rows only. * cols: Rules will appear between columns only. * all: Rules will appear between all rows and columns
stateVar | The attribute provides access to a component state on the client side
style | CSS style(s) is/are to be applied when this component is rendered
styleClass | Corresponds to the HTML class attribute
summary | This attribute provides a summary of the table's purpose and structure for user agents rendering to non-visual media such as speech and Braille
title | Advisory title information about markup elements generated for this component
value | The current value for this component
var | A request-scope attribute via which the data object for the current row will be used when iterating
width | This attribute specifies the desired width of the entire table and is intended for visual user agents. When the value is percentage value, the value is relative to the user agent's available horizontal space. In the absence of any width specification, table width is determined by the user agent

Table 6.124. Component identification parameters

Name | Value
--- | ---
component-type | org.richfaces.DataGrid
component-class | org.richfaces.component.html.HtmlDataGrid
component-family | org.richfaces.DataGrid
renderer-type | org.richfaces.DataGridRenderer
tag-class | org.richfaces.taglib.DataGridTag

### 6.33.3. Creating the Component with a Page Tag

To create the simplest variant of dataGrid on a page, use the following syntax:

Example:

    ...

        <rich:dataGrid value="#{dataTableScrollerBean.allCars}" var="car">

            <h:outputText value="#{car.model}"/>

        </rich:dataGrid>

    ...

### 6.33.4. Creating the Component Dynamically Using Java

Example:

    import org.richfaces.component.html.HtmlDataGrid;

    ...

    HtmlDataGrid myList = new HtmlDataGrid();

    ...

### 6.33.5. Details of Usage

The component takes a list from a model and outputs it the same way as with <h:panelGrid> for inline data. To define grid properties and styles, use the same definitions as for <h:panelGrid>.

The component allows to:

- Use "header" and "footer" facets for output

- Limit number of output elements ( "elements" attribute) and define first element for output ( "first" attribute)

- Bind pages with <rich:datascroller> component

Here is an example:

Example:

    ...

        <rich:panel style="width:150px;height:200px;">

            <h:form>

                  <rich:dataGrid value="#{dataTableScrollerBean.allCars}" var="car" columns="2" elements="4" first="1">

                      <f:facet name="header">

                          <h:outputText value="Car Store"></h:outputText>

                      </f:facet>

                      <rich:panel>

                          <f:facet name="header">

                              <h:outputText value="#{car.make} #{car.model}"></h:outputText>

                          </f:facet>

                          <h:panelGrid columns="2">

                               <h:outputText value="Price:" styleClass="label"></h:outputText>

                               <h:outputText value="#{car.price}"/>

                               <h:outputText value="Mileage:" styleClass="label"></h:outputText>

                               <h:outputText value="#{car.mileage}"/>

                          </h:panelGrid>

                      </rich:panel>

                      <f:facet name="footer">

                          <rich:datascroller></rich:datascroller>

                      </f:facet>

                  </rich:dataGrid>

            </h:form>

        </rich:panel>

    ...

This is a result:

Figure 6.55. Component usage

The component was created basing on the <a4j:repeat> component and as a result it could be partially updated with Ajax. "ajaxKeys" attribute allows to define row keys that are updated after an Ajax request.

Here is an example:

Example:

    ...

        <rich:dataGrid value="#{dataTableScrollerBean.allCars}" var="car" ajaxKeys="#{listBean.list}"

                            binding="#{listBean.dataGrid}" id="grid" elements="4" columns="2">

            ...

        </rich:dataGrid>

    ...

        <a4j:commandButton action="#{listBean.action}" reRender="grid" value="Submit"/>

    ...

In the example "reRender" attribute contains value of "id" attribute for <rich:dataGrid> component. As a result the component is updated after an Ajax request.

### 6.33.6. Look-and-Feel Customization

For skinnability implementation, the components use a style class redefinition method. Default style classes are mapped on skin parameters.

There are two ways to redefine the appearance of all <rich:dataGrid> components at once:

- Redefine the corresponding skin parameters

- Add to your style sheets style classes used by a <rich:dataGrid> component

### 6.33.7. Skin Parameters Redefinition

Skin parameters redefinition for <rich:dataGrid> are the same as for the <rich:dataTable> component.

### 6.33.8. Definition of Custom Style Classes

Custom style classes for <rich:dataGrid> are the same as for the <rich:dataTable> component.

In order to redefine styles for all <rich:dataGrid> components on a page using CSS, it's enough to create classes with the same names (possible classes are the same as for the <rich:dataTable> ) and define necessary properties in them.

Example:

    ...

    .rich-table-footercell{

        color:#ff7800;

    }

    ...

This is a result:

Figure 6.56. Redefinition styles with predefined classes

In the example color of footercell was changed.

Also it's possible to change styles of particular <rich:dataGrid> component. In this case you should create own style classes and use them in corresponding <rich:dataGrid> styleClass attributes. An example is placed below:

Example:

    ...

    .myClass{

        font-style:italic;

    }

    ...

The "columnClasses" attribute for <rich:dataGrid> is defined as it's shown in the example below:

Example:

    <rich:dataGrid ... columnClasses="myClass"/>

This is a result:

Figure 6.57. Redefinition styles with own classes and styleClass attributes

As it could be seen on the picture above, the font style for columns was changed.

### 6.33.9. Relevant Resources Links

Here you can see the example of <rich:dataGrid> usage and sources for the given example.

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