jQuery DataTables display All Records as an option

Question

I'm using a purchased Admin theme for a web app that I'm building. That theme came with styles for jQuery dataTables. I'm trying to figure out how to add a View All Records option to the records per page drop down but because the theme came prestyled there is a lot of code already written and and I don't know how to add what I need to. Here is what I have:

Footer Code:

    <!-- jQuery DataTable -->
    <script src="<?php echo base_url(); ?>assets/js/plugins/dataTables/jquery.datatables.min.js"></script>
    <script>
        /* Default class modification */
        $.extend( $.fn.dataTableExt.oStdClasses, {
            "sWrapper": "dataTables_wrapper form-inline"
        } );

        /* API method to get paging information */
        $.fn.dataTableExt.oApi.fnPagingInfo = function ( oSettings )
        {
            return {
                "iStart":         oSettings._iDisplayStart,
                "iEnd":           oSettings.fnDisplayEnd(),
                "iLength":        oSettings._iDisplayLength,
                "iTotal":         oSettings.fnRecordsTotal(),
                "iFilteredTotal": oSettings.fnRecordsDisplay(),
                "iPage":          Math.ceil( oSettings._iDisplayStart / oSettings._iDisplayLength ),
                "iTotalPages":    Math.ceil( oSettings.fnRecordsDisplay() / oSettings._iDisplayLength )
            };
        }

        /* Bootstrap style pagination control */
        $.extend( $.fn.dataTableExt.oPagination, {
            "bootstrap": {
                "fnInit": function( oSettings, nPaging, fnDraw ) {
                    var oLang = oSettings.oLanguage.oPaginate;
                    var fnClickHandler = function ( e ) {
                        e.preventDefault();
                        if ( oSettings.oApi._fnPageChange(oSettings, e.data.action) ) {
                            fnDraw( oSettings );
                        }
                    };

                    $(nPaging).addClass('pagination').append(
                        '<ul>'+
                            '<li class="prev btn-small disabled"><a href="#"><span class="awe-caret-left"></span> '+oLang.sPrevious+'</a></li>'+
                            '<li class="next btn-small disabled"><a href="#">'+oLang.sNext+' <span class="awe-caret-right"></span></a></li>'+
                        '</ul>'
                    );
                    var els = $('a', nPaging);
                    $(els[0]).bind( 'click.DT', { action: "previous" }, fnClickHandler );
                    $(els[1]).bind( 'click.DT', { action: "next" }, fnClickHandler );
                },

                "fnUpdate": function ( oSettings, fnDraw ) {
                    var iListLength = 0;
                    var oPaging = oSettings.oInstance.fnPagingInfo();
                    var an = oSettings.aanFeatures.p;
                    var i, j, sClass, iStart, iEnd, iHalf=Math.floor(iListLength/2);

                    if ( oPaging.iTotalPages < iListLength) {
                        iStart = 1;
                        iEnd = oPaging.iTotalPages;
                    }
                    else if ( oPaging.iPage <= iHalf ) {
                        iStart = 1;
                        iEnd = iListLength;
                    } else if ( oPaging.iPage >= (oPaging.iTotalPages-iHalf) ) {
                        iStart = oPaging.iTotalPages - iListLength + 1;
                        iEnd = oPaging.iTotalPages;
                    } else {
                        iStart = oPaging.iPage - iHalf + 1;
                        iEnd = iStart + iListLength - 1;
                    }

                    for ( i=0, iLen=an.length ; i<iLen ; i++ ) {

                        // Add / remove disabled classes from the static elements
                        if ( oPaging.iPage === 0 ) {
                            $('li:first', an[i]).addClass('disabled');
                        } else {
                            $('li:first', an[i]).removeClass('disabled');
                        }

                        if ( oPaging.iPage === oPaging.iTotalPages-1 || oPaging.iTotalPages === 0 ) {
                            $('li:last', an[i]).addClass('disabled');
                        } else {
                            $('li:last', an[i]).removeClass('disabled');
                        }
                    }
                }
            }
        });

    </script>

What I want To Add (I Think, based off of another Stack Overflow question):

oTable = $('#example').dataTable({ "aLengthMenu": [
        [25, 50, 100, 200, -1],
        [25, 50, 100, 200, "All"]
    ], 


"iDisplayLength" : -1 });

Answer 1

Since your oTable is your dataTable instance, try:

var oSettings = oTable.fnSettings();
oSettings._iDisplayLength = 500;
oTable.fnDraw();

You can put this in an onClick too:

var oSettings = oTable.fnSettings();

$('.changeLength').click(function(e){
   oSettings._iDisplayLength = 500;
   oTable.fnDraw(); 
});

That way when you click the button it changes the table length.