Search filter debounce for Allan Jardine's DataTables plugin for jQuery. Requires Underscore.js

datatables.set_filter_debounce.js

jQuery.fn.dataTableExt.oApi.fnSetFilterDebounce = function ( oSettings, iDelay ) {
    /*
     * Type:        Plugin for DataTables (www.datatables.net) JQuery plugin.
     * Name:        dataTableExt.oApi.fnSetFilterDebounce
     * Version:     0.01
     * Description: Enables filtration debouncing which prevents filter from
     *              happening until keypresses have stopped for [iDelay] milliseconds.
     *              Uses code from Zygimantas' fnSetFilteringDelay
     * Inputs:      object:oSettings - dataTables settings object
     *              integer:iDelay - delay in miliseconds
     * Returns:     JQuery
     * Usage:       $('#example').dataTable().fnSetFilterDebounce(250);
     * Requires:    DataTables 1.6.0+, Underscore.js 1.1.3+
     *
     * Author:      Sam X Nguyen, Zygimantas Berziunas (www.zygimantas.com)
     *              and Allan Jardine (v2)
     * Created:     June 23, 2011
     * Language:    Javascript
     * License:     GPL v2 or BSD 3 point style
     * Contact:     samxnguyen@gmail.com
     */
    var _that = this;
    this.each( function ( i ) {
        $.fn.dataTableExt.iApiIndex = i;
        var iDelay = (iDelay && (/^[0-9]+$/.test(iDelay)) ? iDelay : 250),
        $this = this,
        oTimerId = null,
        sPreviousSearch = null,
        anControl = $( 'input', _that.fnSettings().aanFeatures.f );

        var fnFilter = function() {
            _that.fnFilter( anControl.val() );
        }

        anControl.unbind( 'keyup' ).bind( 'keyup', _(fnFilter).debounce(iDelay) );

        return this;
    } );

    return this;
}