How to expand all drill down rows while loading a datatable, including the hidden rows

Question 1

So I added functionality on button to collapse all and expand all child rows. that will work with pagination, search and

    <script>
    function format ( d ) {
    // `d` is the original data object for the row
    return '<table cellpadding="5" cellspacing="0" border="0" style="padding-left:50px;">'+
        '<tr>'+
            '<td>Full CallStack:</td>'+
            '<td style="text-align:left;">'+d.call_stack+'</td>'+
        '</tr>'+
    '</table>';
}

$(document).ready(function() {
    var isCollapse = 1;
    var visited_cehck = 0;
    var table = $('#example').DataTable( {
        "aaData": $Json_data,
   "aoColumns": [
        { "sTitle": "col1", "mData": "col1" },
        { "sTitle": "col2",  "mData": "col2" },      
        { "sTitle": "col3",  "mData": "col3" },
        { "sTitle": "col4",  "mData": "col4" },
        { "sTitle": "col5",   "mData": "col5" },
        {
        "class":          'details-control',
        "orderable":      false,
        "data":           null,
        "defaultContent": ''
        }
    ]
    } );


 //This function gets the length of the row and collapse and 
//expend all the rows depending on the current state of the row:    
    function collapse_exand_rows(){
        var table_length = $('#example tbody tr').length;
        for (var i = 0; i < table_length; i++) {
            var tr = $('.details-control').parents('tr').eq(i);
            var row = table.row( tr );
            if(!tr.hasClass('visited_child') || visited_cehck != 1){
                if ( isCollapse === 1 ) {
                    // This row is already open - close it
                    row.child.hide();
                    tr.removeClass('shown');
                }
                else {
                    // Open this row
                    row.child( format(row.data()) ).show();
                    tr.addClass('shown');
                }   
            }
        }
    }

//This event handles click for on each child row to show and hide rows.
    $('#example tbody').on('click', 'td.details-control', function () {
        var tr = $(this).parents('tr');
        var row = table.row( tr );
        visited_cehck = 1;
        tr.addClass('visited_child');
        if ( row.child.isShown() ) {
            // This row is already open - close it
            row.child.hide();
            tr.removeClass('shown');
        }
        else {
            // Open this row
            row.child( format(row.data()) ).show();
            tr.addClass('shown');
        }
    } );

//This event handles navigation bar below the report to show and hide all the visible rows
    $('.dataTables_paginate').bind('click', '.details-control', function(event) {   
        if(visited_cehck === 1){
            return false;
        }
        collapse_exand_rows();
    });

//This event handles collapse expand button click to show and hide all the visible rows
    $('#collapse_expand').on('click', function(event) {
        visited_cehck = 0;
        if(isCollapse === 1){
            $('#collapse_expand').text('Collapse All');
            isCollapse = 0; 
        }
        else{
            $('#collapse_expand').text('Expand All');
            isCollapse = 1;
        }
        collapse_exand_rows();
    });

//This event handles dropdown to show and hide all the visible rows
    $('select').on('change', function (event) {
        collapse_exand_rows();  
    });

    $("thead > tr", '#example').click(function(event) {
        collapse_exand_rows();  
    })

    $(':input').change(function(event) {
        collapse_exand_rows();  
    });
});
</script>

Question 2

do something like this:

var table_length = $("#mastertable tr").length;
var paginate_button = $('.paginate_button');
for(var i = 0; i< table_length; i++){
    var tr = $('#mastertable tbody td.details-control').eq(i).parents('tr');
    var row = table.row(tr);
     row.child( format(row.data()) ).show();
    tr.addClass('shown');
}

if you have pagination :

isCollapse === 0
paginate_button.on('click',function(){
    table_length = $("#example tr").length;
    if ( isCollapse === 1 ) {
          for(var i = 0; i< table_length; i++){
                var tr = $('#example tbody td.details-control').eq(i).parents('tr');
                var row = table.row(tr);
                row.child.hide();
                tr.removeClass('shown');
             }
       }
    else {
        // Open this row
        for(var i = 0; i< table_length; i++){
             var tr = $('#example tbody td.details-control').eq(i).parents('tr');
            var row = table.row(tr);
            row.child( format(row.data()) ).show();
            tr.addClass('shown');
        }
    }       
        });