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Contents

Biglistbox

Employment/Purpose

A component to handle a huge data sets and provides the same and as many as the functionalities of Listbox including selection, sorting, keystroke navigation, ROD(rendering-on-demand), and so on..

Example

ZKComRef Biglistbox.PNG

<biglistbox hflex="1" vflex="1">
    <!-- Template example
    <template name="heads">
        <html><![CDATA[
    <div class="images_${matrixInfo[0]%28}" title="x=${matrixInfo[0]},y=${matrixInfo[1]}">${each[matrixInfo[0]]}</div>
        ]]></html>
    </template>
    <template name="rows">
        <html><![CDATA[
     <div class="images_${matrixInfo[0]%28}" title="x=${matrixInfo[0]},y=${matrixInfo[1]}">${each[matrixInfo[0]]}</div>
        ]]></html>
    </template> -->
</biglistbox>

As you can see, we utilize two attributes - rowIndex & colIndex from the matrixInfo object to receive the current index during template rendering phase.

Mouseless Entry Listbox

  • Press UP and DOWN to move the selection up and down by one item.
  • Press LEFT and RIGHT to move the selection left and right by one item.
  • Press PgUp and PgDn to move the selection up and down by one page.
  • Press HOME to move the selection to the first item, and END to move to the last item.

Model/Renderer

MatrixModel

By default, ZK does not provide a built-in model implementation class for MatrixModel because Biglistbox is designed to handle unlimited data set, therefore, there is no need to handle model data in memory. This usage is application-dependent and varies from case to case. However, you can extend your own implementation from the AbstractListModel skeleton class. For more details, please refer to this smalltalk.

MatrixRenderer

Here is an implementation example of MatrixRenderer

new MatrixRenderer<List<String>>() {

	@Override
	public String renderCell(Component owner, List<String> data,
			int rowIndex, int colIndex) throws Exception {
		String d = data.get(colIndex);
		d = d.replace("ZK", "<span class='red' title='ZK'>ZK</span>")
				.replace("Hello", "<span class='blue' title='Hello'>Hello</span>");
		return "<div class='images_" + (colIndex%28) + "' title='x=" + 
		colIndex + ",y=" + rowIndex + "'>" + d + "</div>";
	}

	@Override
	public String renderHeader(Component owner, List<String> data,
			int rowIndex, int colIndex) throws Exception {
		return "<div class='images_" + (colIndex % 28) + "' title='"
				+ images[colIndex % 28] + "'>" + data.get(colIndex)
				+ "</div>";
	}
}

As you can see, we must implement two methods - renderCell and renderHeader defined by MatrixRenderer to generate the HTML output string for cells and headers. In the MatrixRenderer interface, the two methods we designed allow developers to generate any kind of HTML result for display, you can use either MatrixRenderer interface or Template function to render the content for Biglistbox.

Properties

Capture1.PNG

  • cols: specify column size for viewport.
  • rows: specify row size for viewport.
  • colWidth: specify column width for each column.
  • rowHeight: specify row height for each row.
  • matrixRenderer: specify matrix renderer.
  • model: specify matrix model.
  • oddRowSclass: specify sclass for this component to stripe.
  • frozenCols: specify how many columns are frozen.
  • fixFrozenCols: specify whether to enable the fix frozen columns that user cannot change the columns size dynamically.
  • autoCols: specify whether to enable the auto-adjusting cols' size. Default: true
  • autoRows: specify whether to enable the auto-adjusting rows' size. Default: true

Custom Attributes

org.zkoss.zkmax.zul.biglistbox.preloadSize

[default: 50]
[inherit: true][1]

It specifies the number of items to preload when receiving the rendering request from the client. It is used only if live data (Biglistbox.setModel(MatrixModel)).


  1. The custom attribute could be specified in this component, or any of its ancestor. In addition, it could be specified as a library property to enable or disable it for the whole application.


Supported Events

Name
Event Type
onSelect
Event: SelectEvent

Represents an event cause by user's the list selection is changed at the client.

onSort
Event: SortEventExt

Represents an event that indicates a sorting request to data for Biglistbox and provides more information about the column index.

onScroll
Event: ScrollEventExt

Represents an event caused by that user is scrolling or has scrolled at the client for Biglistbox component and provides more information about the position X and Y data.

onScrollX
Event: ScrollEventExt

Represents an event caused by that user is scrolling or has scrolled the X-axis at the client for Biglistbox component and provides more information about the position X and Y data.

onScrollY
Event: ScrollEventExt

Represents an event caused by that user is scrolling or has scrolled the Y-axis at the client for Biglistbox component and provides more information about the position X and Y data.

onCellClick
Event: CellClickEvent

Represents an event that indicates a clicking on a cell data for a matrix data component like Biglistbox, and provides more information about the row index and the column index.

onAfterRender
Event: Event

Notifies one that the model's data has been rendered.

Supported Molds

  • The default mold

Supported Children

None

Use Cases

Version Description Example Location
6.0.1+ Handling a Trillion Data Using ZK Small Talks

Version History



Copyright © Potix Corporation. This article is licensed under GNU Free Documentation License.