mirror of
https://github.com/cwinfo/powerdns-admin.git
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554 lines
21 KiB
HTML
554 lines
21 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<link rel="shortcut icon" type="image/ico" href="http://www.datatables.net/favicon.ico">
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<meta name="viewport" content="initial-scale=1.0, maximum-scale=2.0">
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<title>DataTables example - Pipelining data to reduce Ajax calls for paging</title>
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<link rel="stylesheet" type="text/css" href="../../media/css/jquery.dataTables.css">
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<link rel="stylesheet" type="text/css" href="../resources/syntax/shCore.css">
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<link rel="stylesheet" type="text/css" href="../resources/demo.css">
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<style type="text/css" class="init">
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</style>
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<script type="text/javascript" language="javascript" src="../../media/js/jquery.js"></script>
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<script type="text/javascript" language="javascript" src="../../media/js/jquery.dataTables.js"></script>
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<script type="text/javascript" language="javascript" src="../resources/syntax/shCore.js"></script>
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<script type="text/javascript" language="javascript" src="../resources/demo.js"></script>
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<script type="text/javascript" language="javascript" class="init">
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//
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// Pipelining function for DataTables. To be used to the `ajax` option of DataTables
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//
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$.fn.dataTable.pipeline = function ( opts ) {
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// Configuration options
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var conf = $.extend( {
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pages: 5, // number of pages to cache
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url: '', // script url
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data: null, // function or object with parameters to send to the server
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// matching how `ajax.data` works in DataTables
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method: 'GET' // Ajax HTTP method
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}, opts );
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// Private variables for storing the cache
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var cacheLower = -1;
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var cacheUpper = null;
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var cacheLastRequest = null;
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var cacheLastJson = null;
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return function ( request, drawCallback, settings ) {
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var ajax = false;
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var requestStart = request.start;
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var drawStart = request.start;
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var requestLength = request.length;
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var requestEnd = requestStart + requestLength;
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if ( settings.clearCache ) {
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// API requested that the cache be cleared
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ajax = true;
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settings.clearCache = false;
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}
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else if ( cacheLower < 0 || requestStart < cacheLower || requestEnd > cacheUpper ) {
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// outside cached data - need to make a request
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ajax = true;
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}
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else if ( JSON.stringify( request.order ) !== JSON.stringify( cacheLastRequest.order ) ||
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JSON.stringify( request.columns ) !== JSON.stringify( cacheLastRequest.columns ) ||
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JSON.stringify( request.search ) !== JSON.stringify( cacheLastRequest.search )
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) {
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// properties changed (ordering, columns, searching)
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ajax = true;
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}
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// Store the request for checking next time around
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cacheLastRequest = $.extend( true, {}, request );
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if ( ajax ) {
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// Need data from the server
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if ( requestStart < cacheLower ) {
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requestStart = requestStart - (requestLength*(conf.pages-1));
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if ( requestStart < 0 ) {
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requestStart = 0;
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}
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}
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cacheLower = requestStart;
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cacheUpper = requestStart + (requestLength * conf.pages);
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request.start = requestStart;
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request.length = requestLength*conf.pages;
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// Provide the same `data` options as DataTables.
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if ( $.isFunction ( conf.data ) ) {
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// As a function it is executed with the data object as an arg
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// for manipulation. If an object is returned, it is used as the
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// data object to submit
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var d = conf.data( request );
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if ( d ) {
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$.extend( request, d );
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}
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}
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else if ( $.isPlainObject( conf.data ) ) {
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// As an object, the data given extends the default
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$.extend( request, conf.data );
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}
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settings.jqXHR = $.ajax( {
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"type": conf.method,
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"url": conf.url,
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"data": request,
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"dataType": "json",
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"cache": false,
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"success": function ( json ) {
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cacheLastJson = $.extend(true, {}, json);
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if ( cacheLower != drawStart ) {
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json.data.splice( 0, drawStart-cacheLower );
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}
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json.data.splice( requestLength, json.data.length );
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drawCallback( json );
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}
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} );
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}
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else {
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json = $.extend( true, {}, cacheLastJson );
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json.draw = request.draw; // Update the echo for each response
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json.data.splice( 0, requestStart-cacheLower );
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json.data.splice( requestLength, json.data.length );
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drawCallback(json);
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}
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}
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};
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// Register an API method that will empty the pipelined data, forcing an Ajax
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// fetch on the next draw (i.e. `table.clearPipeline().draw()`)
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$.fn.dataTable.Api.register( 'clearPipeline()', function () {
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return this.iterator( 'table', function ( settings ) {
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settings.clearCache = true;
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} );
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} );
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//
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// DataTables initialisation
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//
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$(document).ready(function() {
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$('#example').dataTable( {
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"processing": true,
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"serverSide": true,
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"ajax": $.fn.dataTable.pipeline( {
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url: 'scripts/server_processing.php',
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pages: 5 // number of pages to cache
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} )
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} );
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} );
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</script>
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</head>
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<body class="dt-example">
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<div class="container">
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<section>
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<h1>DataTables example <span>Pipelining data to reduce Ajax calls for paging</span></h1>
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<div class="info">
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<p>Sever-side processing can be quite hard on your server, since it makes an Ajax call to the server
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for every draw request that is made. On sites with a large number of page views, you could potentially
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end up DDoSing your own server with your own applications!</p>
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<p>This example shows one technique to reduce the number of Ajax calls that are made to the server by
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caching more data than is needed for each draw. This is done by intercepting the Ajax call and routing
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it through a data cache control; using the data from the cache if available, and making the Ajax
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request if not. This intercept of the Ajax request is performed by giving the <a href=
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"//datatables.net/reference/option/ajax"><code class="option" title=
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"DataTables initialisation option">ajax<span>DT</span></code></a> option as a function. This function
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then performs the logic of deciding if another Ajax call is needed, or if data from the cache can be
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used.</p>
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<p>Keep in mind that this caching is for paging only; the pipeline must be cleared for other
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interactions such as ordering and searching since the full data set, when using server-side processing,
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is only available at the server.</p>
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</div>
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<table id="example" class="display" cellspacing="0" width="100%">
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<thead>
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<tr>
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<th>Name</th>
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<th>Position</th>
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<th>Office</th>
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<th>Extn.</th>
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<th>Start date</th>
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<th>Salary</th>
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</tr>
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</thead>
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<tfoot>
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<tr>
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<th>Name</th>
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<th>Position</th>
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<th>Office</th>
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<th>Extn.</th>
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<th>Start date</th>
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<th>Salary</th>
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</tr>
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</tfoot>
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</table>
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<ul class="tabs">
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<li class="active">Javascript</li>
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<li>HTML</li>
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<li>CSS</li>
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<li>Ajax</li>
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<li>Server-side script</li>
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</ul>
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<div class="tabs">
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<div class="js">
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<p>The Javascript shown below is used to initialise the table shown in this
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example:</p><code class="multiline brush: js;">//
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// Pipelining function for DataTables. To be used to the `ajax` option of DataTables
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//
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$.fn.dataTable.pipeline = function ( opts ) {
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// Configuration options
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var conf = $.extend( {
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pages: 5, // number of pages to cache
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url: '', // script url
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data: null, // function or object with parameters to send to the server
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// matching how `ajax.data` works in DataTables
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method: 'GET' // Ajax HTTP method
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}, opts );
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// Private variables for storing the cache
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var cacheLower = -1;
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var cacheUpper = null;
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var cacheLastRequest = null;
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var cacheLastJson = null;
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return function ( request, drawCallback, settings ) {
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var ajax = false;
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var requestStart = request.start;
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var drawStart = request.start;
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var requestLength = request.length;
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var requestEnd = requestStart + requestLength;
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if ( settings.clearCache ) {
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// API requested that the cache be cleared
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ajax = true;
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settings.clearCache = false;
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}
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else if ( cacheLower < 0 || requestStart < cacheLower || requestEnd > cacheUpper ) {
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// outside cached data - need to make a request
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ajax = true;
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}
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else if ( JSON.stringify( request.order ) !== JSON.stringify( cacheLastRequest.order ) ||
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JSON.stringify( request.columns ) !== JSON.stringify( cacheLastRequest.columns ) ||
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JSON.stringify( request.search ) !== JSON.stringify( cacheLastRequest.search )
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) {
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// properties changed (ordering, columns, searching)
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ajax = true;
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}
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// Store the request for checking next time around
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cacheLastRequest = $.extend( true, {}, request );
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if ( ajax ) {
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// Need data from the server
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if ( requestStart < cacheLower ) {
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requestStart = requestStart - (requestLength*(conf.pages-1));
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if ( requestStart < 0 ) {
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requestStart = 0;
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}
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}
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cacheLower = requestStart;
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cacheUpper = requestStart + (requestLength * conf.pages);
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request.start = requestStart;
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request.length = requestLength*conf.pages;
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// Provide the same `data` options as DataTables.
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if ( $.isFunction ( conf.data ) ) {
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// As a function it is executed with the data object as an arg
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// for manipulation. If an object is returned, it is used as the
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// data object to submit
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var d = conf.data( request );
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if ( d ) {
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$.extend( request, d );
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}
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}
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else if ( $.isPlainObject( conf.data ) ) {
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// As an object, the data given extends the default
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$.extend( request, conf.data );
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}
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settings.jqXHR = $.ajax( {
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"type": conf.method,
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"url": conf.url,
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"data": request,
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"dataType": "json",
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"cache": false,
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"success": function ( json ) {
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cacheLastJson = $.extend(true, {}, json);
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if ( cacheLower != drawStart ) {
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json.data.splice( 0, drawStart-cacheLower );
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}
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json.data.splice( requestLength, json.data.length );
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drawCallback( json );
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}
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} );
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}
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else {
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json = $.extend( true, {}, cacheLastJson );
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json.draw = request.draw; // Update the echo for each response
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json.data.splice( 0, requestStart-cacheLower );
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json.data.splice( requestLength, json.data.length );
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drawCallback(json);
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}
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}
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};
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// Register an API method that will empty the pipelined data, forcing an Ajax
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// fetch on the next draw (i.e. `table.clearPipeline().draw()`)
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$.fn.dataTable.Api.register( 'clearPipeline()', function () {
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return this.iterator( 'table', function ( settings ) {
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settings.clearCache = true;
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} );
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} );
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//
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// DataTables initialisation
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//
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$(document).ready(function() {
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$('#example').dataTable( {
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"processing": true,
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"serverSide": true,
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"ajax": $.fn.dataTable.pipeline( {
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url: 'scripts/server_processing.php',
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pages: 5 // number of pages to cache
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} )
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} );
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} );</code>
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<p>In addition to the above code, the following Javascript library files are loaded for use in this
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example:</p>
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<ul>
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<li><a href="../../media/js/jquery.js">../../media/js/jquery.js</a></li>
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<li><a href="../../media/js/jquery.dataTables.js">../../media/js/jquery.dataTables.js</a></li>
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</ul>
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</div>
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<div class="table">
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<p>The HTML shown below is the raw HTML table element, before it has been enhanced by
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DataTables:</p>
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</div>
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<div class="css">
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<div>
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<p>This example uses a little bit of additional CSS beyond what is loaded from the library
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files (below), in order to correctly display the table. The additional CSS used is shown
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below:</p><code class="multiline brush: js;"></code>
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</div>
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<p>The following CSS library files are loaded for use in this example to provide the styling of the
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table:</p>
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<ul>
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<li><a href=
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"../../media/css/jquery.dataTables.css">../../media/css/jquery.dataTables.css</a></li>
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</ul>
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</div>
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<div class="ajax">
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<p>This table loads data by Ajax. The latest data that has been loaded is shown below. This data
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will update automatically as any additional data is loaded.</p>
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</div>
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<div class="php">
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<p>The script used to perform the server-side processing for this table is shown below. Please note
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that this is just an example script using PHP. Server-side processing scripts can be written in any
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language, using <a href="//datatables.net/manual/server-side">the protocol described in the
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DataTables documentation</a>.</p>
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</div>
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</div>
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</section>
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</div>
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<section>
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<div class="footer">
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<div class="gradient"></div>
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<div class="liner">
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<h2>Other examples</h2>
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<div class="toc">
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<div class="toc-group">
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<h3><a href="../basic_init/index.html">Basic initialisation</a></h3>
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<ul class="toc">
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<li><a href="../basic_init/zero_configuration.html">Zero configuration</a></li>
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<li><a href="../basic_init/filter_only.html">Feature enable / disable</a></li>
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<li><a href="../basic_init/table_sorting.html">Default ordering (sorting)</a></li>
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<li><a href="../basic_init/multi_col_sort.html">Multi-column ordering</a></li>
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<li><a href="../basic_init/multiple_tables.html">Multiple tables</a></li>
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<li><a href="../basic_init/hidden_columns.html">Hidden columns</a></li>
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<li><a href="../basic_init/complex_header.html">Complex headers (rowspan and
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colspan)</a></li>
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<li><a href="../basic_init/dom.html">DOM positioning</a></li>
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<li><a href="../basic_init/flexible_width.html">Flexible table width</a></li>
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<li><a href="../basic_init/state_save.html">State saving</a></li>
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<li><a href="../basic_init/alt_pagination.html">Alternative pagination</a></li>
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<li><a href="../basic_init/scroll_y.html">Scroll - vertical</a></li>
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<li><a href="../basic_init/scroll_x.html">Scroll - horizontal</a></li>
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<li><a href="../basic_init/scroll_xy.html">Scroll - horizontal and vertical</a></li>
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<li><a href="../basic_init/scroll_y_theme.html">Scroll - vertical with jQuery UI
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ThemeRoller</a></li>
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<li><a href="../basic_init/comma-decimal.html">Language - Comma decimal place</a></li>
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<li><a href="../basic_init/language.html">Language options</a></li>
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</ul>
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</div>
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<div class="toc-group">
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<h3><a href="../advanced_init/index.html">Advanced initialisation</a></h3>
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<ul class="toc">
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<li><a href="../advanced_init/events_live.html">DOM / jQuery events</a></li>
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<li><a href="../advanced_init/dt_events.html">DataTables events</a></li>
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<li><a href="../advanced_init/column_render.html">Column rendering</a></li>
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<li><a href="../advanced_init/length_menu.html">Page length options</a></li>
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<li><a href="../advanced_init/dom_multiple_elements.html">Multiple table control
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elements</a></li>
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<li><a href="../advanced_init/complex_header.html">Complex headers (rowspan /
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colspan)</a></li>
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<li><a href="../advanced_init/html5-data-attributes.html">HTML5 data-* attributes</a></li>
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<li><a href="../advanced_init/language_file.html">Language file</a></li>
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<li><a href="../advanced_init/defaults.html">Setting defaults</a></li>
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<li><a href="../advanced_init/row_callback.html">Row created callback</a></li>
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<li><a href="../advanced_init/row_grouping.html">Row grouping</a></li>
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<li><a href="../advanced_init/footer_callback.html">Footer callback</a></li>
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<li><a href="../advanced_init/dom_toolbar.html">Custom toolbar elements</a></li>
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<li><a href="../advanced_init/sort_direction_control.html">Order direction sequence
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control</a></li>
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</ul>
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</div>
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|
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<div class="toc-group">
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<h3><a href="../styling/index.html">Styling</a></h3>
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|
<ul class="toc">
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<li><a href="../styling/display.html">Base style</a></li>
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<li><a href="../styling/no-classes.html">Base style - no styling classes</a></li>
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<li><a href="../styling/cell-border.html">Base style - cell borders</a></li>
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<li><a href="../styling/compact.html">Base style - compact</a></li>
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<li><a href="../styling/hover.html">Base style - hover</a></li>
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<li><a href="../styling/order-column.html">Base style - order-column</a></li>
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<li><a href="../styling/row-border.html">Base style - row borders</a></li>
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<li><a href="../styling/stripe.html">Base style - stripe</a></li>
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<li><a href="../styling/bootstrap.html">Bootstrap</a></li>
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<li><a href="../styling/foundation.html">Foundation</a></li>
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<li><a href="../styling/jqueryUI.html">jQuery UI ThemeRoller</a></li>
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|
</ul>
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|
</div>
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|
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<div class="toc-group">
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<h3><a href="../data_sources/index.html">Data sources</a></h3>
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<ul class="toc">
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<li><a href="../data_sources/dom.html">HTML (DOM) sourced data</a></li>
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<li><a href="../data_sources/ajax.html">Ajax sourced data</a></li>
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<li><a href="../data_sources/js_array.html">Javascript sourced data</a></li>
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<li><a href="../data_sources/server_side.html">Server-side processing</a></li>
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</ul>
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|
</div>
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|
|
|
<div class="toc-group">
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<h3><a href="../api/index.html">API</a></h3>
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|
<ul class="toc">
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|
<li><a href="../api/add_row.html">Add rows</a></li>
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|
<li><a href="../api/multi_filter.html">Individual column searching (text inputs)</a></li>
|
|
<li><a href="../api/multi_filter_select.html">Individual column searching (select
|
|
inputs)</a></li>
|
|
<li><a href="../api/highlight.html">Highlighting rows and columns</a></li>
|
|
<li><a href="../api/row_details.html">Child rows (show extra / detailed
|
|
information)</a></li>
|
|
<li><a href="../api/select_row.html">Row selection (multiple rows)</a></li>
|
|
<li><a href="../api/select_single_row.html">Row selection and deletion (single
|
|
row)</a></li>
|
|
<li><a href="../api/form.html">Form inputs</a></li>
|
|
<li><a href="../api/counter_columns.html">Index column</a></li>
|
|
<li><a href="../api/show_hide.html">Show / hide columns dynamically</a></li>
|
|
<li><a href="../api/api_in_init.html">Using API in callbacks</a></li>
|
|
<li><a href="../api/tabs_and_scrolling.html">Scrolling and jQuery UI tabs</a></li>
|
|
<li><a href="../api/regex.html">Search API (regular expressions)</a></li>
|
|
</ul>
|
|
</div>
|
|
|
|
<div class="toc-group">
|
|
<h3><a href="../ajax/index.html">Ajax</a></h3>
|
|
<ul class="toc">
|
|
<li><a href="../ajax/simple.html">Ajax data source (arrays)</a></li>
|
|
<li><a href="../ajax/objects.html">Ajax data source (objects)</a></li>
|
|
<li><a href="../ajax/deep.html">Nested object data (objects)</a></li>
|
|
<li><a href="../ajax/objects_subarrays.html">Nested object data (arrays)</a></li>
|
|
<li><a href="../ajax/orthogonal-data.html">Orthogonal data</a></li>
|
|
<li><a href="../ajax/null_data_source.html">Generated content for a column</a></li>
|
|
<li><a href="../ajax/custom_data_property.html">Custom data source property</a></li>
|
|
<li><a href="../ajax/custom_data_flat.html">Flat array data source</a></li>
|
|
<li><a href="../ajax/defer_render.html">Deferred rendering for speed</a></li>
|
|
</ul>
|
|
</div>
|
|
|
|
<div class="toc-group">
|
|
<h3><a href="./index.html">Server-side</a></h3>
|
|
<ul class="toc active">
|
|
<li><a href="./simple.html">Server-side processing</a></li>
|
|
<li><a href="./custom_vars.html">Custom HTTP variables</a></li>
|
|
<li><a href="./post.html">POST data</a></li>
|
|
<li><a href="./ids.html">Automatic addition of row ID attributes</a></li>
|
|
<li><a href="./object_data.html">Object data source</a></li>
|
|
<li><a href="./row_details.html">Row details</a></li>
|
|
<li><a href="./select_rows.html">Row selection</a></li>
|
|
<li><a href="./jsonp.html">JSONP data source for remote domains</a></li>
|
|
<li><a href="./defer_loading.html">Deferred loading of data</a></li>
|
|
<li class="active"><a href="./pipeline.html">Pipelining data to reduce Ajax calls for
|
|
paging</a></li>
|
|
</ul>
|
|
</div>
|
|
|
|
<div class="toc-group">
|
|
<h3><a href="../plug-ins/index.html">Plug-ins</a></h3>
|
|
<ul class="toc">
|
|
<li><a href="../plug-ins/api.html">API plug-in methods</a></li>
|
|
<li><a href="../plug-ins/sorting_auto.html">Ordering plug-ins (with type
|
|
detection)</a></li>
|
|
<li><a href="../plug-ins/sorting_manual.html">Ordering plug-ins (no type
|
|
detection)</a></li>
|
|
<li><a href="../plug-ins/range_filtering.html">Custom filtering - range search</a></li>
|
|
<li><a href="../plug-ins/dom_sort.html">Live DOM ordering</a></li>
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
|
|
<div class="epilogue">
|
|
<p>Please refer to the <a href="http://www.datatables.net">DataTables documentation</a> for full
|
|
information about its API properties and methods.<br>
|
|
Additionally, there are a wide range of <a href="http://www.datatables.net/extras">extras</a> and
|
|
<a href="http://www.datatables.net/plug-ins">plug-ins</a> which extend the capabilities of
|
|
DataTables.</p>
|
|
|
|
<p class="copyright">DataTables designed and created by <a href=
|
|
"http://www.sprymedia.co.uk">SpryMedia Ltd</a> © 2007-2014<br>
|
|
DataTables is licensed under the <a href="http://www.datatables.net/mit">MIT license</a>.</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</section>
|
|
</body>
|
|
</html> |