Disable initial automatic ajax call - DataTable se

2019-03-12 10:04发布

站内问答 / jQuery
1749 3 4

I have a dataTable initialized with server side paging and it is working fine. This table triggers ajax, pulls data and renders onto the table during initialization. However I need empty table initially and load table data on click of a button using load() or reload() like:

myTable.api().ajax.reload();

Here is my table initialization:

function initTestTable(){
    myTable =  $('#testTable').dataTable({
    "processing": true,
    "serverSide": true,
    "ajax": {
        "url": "testTableData.html",
        "type": "GET",
    },
    "columns": [
        { "data": "code" },
        { "data": "description" }
    ]
 });
}

There should be a way to restrict the loading of table during initialization? I read the documentation but could not find. Please suggest.

3条回答
在下西门庆
2楼-- · 2019-03-12 10:28

You could use the deferLoading parameter and set it to 0. This will delay the loading of data until a filter, sorting action or draw/reload Ajax happens programmatically.

function initTestTable(){
    myTable =  $('#testTable').dataTable({
    "processing": true,
    "serverSide": true,
    "deferLoading": 0, // here
    "ajax": {
        "url": "testTableData.html",
        "type": "GET",
    },
    "columns": [
        { "data": "code" },
        { "data": "description" }
    ]
 });
}

To trigger the Ajax when the button is clicked you can have something like the following in the handler:

function buttonClickHandler(event){
  $('#testTable').DataTable().draw();
}

See example below for demonstration.

$(document).ready(function() {
  // AJAX emulation for demonstration only
  $.mockjax({
      url: '/test/0',
      responseTime: 200,
      response: function(settings){
         this.responseText = {
            draw: settings.data.draw,
            data: [
              [ "Tiger Nixon", "System Architect", "Edinburgh", 61, "2011/04/25", "$320,800" ],
              [ "Tiger Nixon", "System Architect", "Edinburgh", 61, "2011/04/25", "$320,800" ],
              [ "Tiger Nixon", "System Architect", "Edinburgh", 61, "2011/04/25", "$320,800" ],
              [ "Tiger Nixon", "System Architect", "Edinburgh", 61, "2011/04/25", "$320,800" ],
              [ "Tiger Nixon", "System Architect", "Edinburgh", 61, "2011/04/25", "$320,800" ],
              [ "Tiger Nixon", "System Architect", "Edinburgh", 61, "2011/04/25", "$320,800" ],
              [ "Tiger Nixon", "System Architect", "Edinburgh", 61, "2011/04/25", "$320,800" ],
              [ "Tiger Nixon", "System Architect", "Edinburgh", 61, "2011/04/25", "$320,800" ],
              [ "Tiger Nixon", "System Architect", "Edinburgh", 61, "2011/04/25", "$320,800" ],
              [ "Tiger Nixon", "System Architect", "Edinburgh", 61, "2011/04/25", "$320,800" ]
            ],
            recordsTotal: 1000,
            recordsFiltered: 1000
         };
      }
  });

  $('#example').DataTable({    
    "processing": true,
    "serverSide": true,
    "deferLoading": 0,
    "ajax": {
        "url": "/test/0",
        "type": "GET"
    }    
  });
      
  $('#btn-reload').on('click', function(){
     $('#example').DataTable().draw()  
  });
});
<!DOCTYPE html>
<html>

<head>
<meta charset="ISO-8859-1">
<link href="//cdn.datatables.net/1.10.5/css/jquery.dataTables.min.css" rel="stylesheet"/> 
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script> 
<script src="//cdn.datatables.net/1.10.5/js/jquery.dataTables.min.js"></script>
<script src="http://vitalets.github.com/x-editable/assets/mockjax/jquery.mockjax.js"></script>
  
</head>
<body>
<p>
<button id="btn-reload">Reload</button>
</p>
<table id="example" class="display" cellspacing="0" width="100%">

<thead>
   <tr>
      <th>Name</th>
      <th>Position</th>
      <th>Office</th>
      <th>Age</th>
      <th>Start date</th>
      <th>Salary</th>
   </tr>
</thead>

<tfoot>
   <tr>
      <th>Name</th>
      <th>Position</th>
      <th>Office</th>
      <th>Age</th>
      <th>Start date</th>
      <th>Salary</th>
   </tr>
</tfoot>

<tbody>
</tbody>
</table>
</body>
</html>

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beautiful°
3楼-- · 2019-03-12 10:31

This is how I initially load my empty dataTable on page load. Then I load it with data via ajax using an eventListener. I couldn't find any documentation I just kind of played around with it and it works like a charm.

ref files - dataTables.js, table-advanced.js

$(document).ready(function(){
   option = "I";
  // pick a table list or something
  $("#dropdownList").on("change", function(){
      option = $('option:selected:not(:disabled)',this).val();
    if($.fn.DataTable.isDataTable('#table_001')){
       $('#table_001').dataTable().fnDestroy();
       InitDataTable(option); 
     }
     else{
       InitDataTable("disabled");   
     }    
    });

     //add/delete/update a row maybe?
     $("#signupForm #add_btn").on("click",function(e){
       if($("#signupForm").valid()){
            var oTable1 = $('#table_001').DataTable(); ///load .ajax structure 
             //Successful Submit!
             oTable1.ajax.reload(); 
            $("#note").html(<img src="/images/loading.gif" alt="loading">');
        }
     });

     //On draw occurs everytime you call table.ajax.reload(); 
     $('#table_001').on( 'draw.dt', function () { 
            if(option !== "I")
                  var evtname = $('select[name="EVENT"] option:selected:not(:disabled)').text();

            if(evtname !== undefined)
                $("#event_name").html("The " + evtname + " Signup Sheet").addClass("xs-small");
            // keep track of values for table input fields on each draw
            $("[aria-controls='table_001'][type='search']").attr('hth_orig',$("            [aria-controls='table_001'][type='search']").val());
            //Don't initialize on draw 
            TableAdvanced.init('table_001','N');
});


  var InitDataTable = function(choice){

            var oTable1 = $('#table_001').dataTable( {
                "processing": true,
                "serverSide": true,
                "lengthMenu": [10,25,50,100], // records pulldown
                "iDisplayLength": 25, // # records to initially display
                "ajax": {
                    "url": "http://www.domain.com",
                    "data": function (d) { // pass additional        
                                d.user = user; 
                                d.choice = choice; 
                                d.cols = "15"; // TOTAL <td> tags per <tr> tag  
                    },
                    // Load attendee total and pending total sections 
                    complete: function (d) {
                        recordstotal = d.responseJSON.recordsTotal;
                        attendeetotal = d.responseJSON.attendeeTotal;
                        //console.log(JSON.stringify(d.responseJSON.data));
                        if ( attendeetotal == '0') {
             $("#totalAttendees").html("No one has signed up for this event yet");
                        }
                        else {
        $("#totalAttendees").html("Event Total: " +  attendeetotal + " attendees");                     
                        }  
                        $("#add-atn").removeClass("hidden");
                    } 
                }, 
                // insert code to execute after table has been redrawn
                "fnDrawCallback": function( oSettings ) {
                    // Column filtering
                    var table = $('#table_001').DataTable();
                    $("#table_001 tfoot th").each( function ( i ) { // i = 0,1...
                        if($.trim($(this).html()) != '') {
                            save_html = $(this).html();
                            $(this).empty(); 
                            var select = $(save_html)
                            .appendTo( this )
                            .on( 'change', function () {
               table.column( i, { filter: 'applied'                }).search($(this).val()).draw();
                            }); 
                            $("#table_001 tfoot th:eq("+i+") input").val(save_value);
                        } 
                    });     
                    //console.log($("#table_001 tfoot th").length);
                 },

                "columns": [// set "data" to next sequential number in double quotes
                        {"data":"0",// Set "name" to field name that will be refd
                        "name": "skip"},        
                        {"data":"1", 
                        "name": "skip"}, 
                        {"data": "2",
                        "name": "skip"},
                        {"data":"3", 
                        "name": "lname"},
                        {"data":"4", 
                        "name": "fname"}
                          {"data":"5",
                           "name": "skip"}
                ],      
                "columnDefs": [                    
                        // what columns should be hidden?       
                        {
                        "targets": [1], // what element starting with 0
                        "class":"hidden" // class to attach to <td>
                        },
                        // what columns should NOT be sortable?       
                        {
                        "targets": [0,1,2,5,6,7,8,9,12,13,14], 
                        "sortable": false, // sortable?
                        },
                        // what columns should NOT be searchable?       
                        {
                        "targets": [0,1,2,6,7,8,9,12,13,14],  
                        "searchable": false, // searchable?
                        }
                ],  
                "createdRow": function( row, data, dataIndex ) { 
                    //manipulate the specific column in the row   
                     //$(row).addClass( 'form-group' ); 
                     // $('td', row).eq(2).addClass('form-group'); // Added to <td>

                 },
                // Specify initial sort order       
               "order": [[ '10', "desc" ],[ '11', "desc" ],['3',"asc"],['4',"asc"]]   
            });

            // handle 1st page table load initialization using 
            TableAdvanced.init('table_001','Y');

    });
    }

NOTE: You could add some logic that selects a default option if there is one that is available and not disabled.

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成全新的幸福
4楼-- · 2019-03-12 10:38

I could do it with a workaround by passing an extra parameter with the URL to identify the event.

For example, for on load I initialized the data table with action="load" as query param and for other action like search, am passing action="search". With this I, at the back end, will be able to identify the call origin. If it is anything other than "load", I am pulling the data & passing (as the implementation is now). Otherwise (if "load") then I am passing empty data, which will show me "No Data Found" message as if it did not made the ajax call.

Here is my code - Table initialization:

function initTestTable(){
    myTable =  $('#testTable').dataTable({
    "processing": true,
    "serverSide": true,
    "ajax": {
        "url": "testTableData.html?action=load",
        "type": "GET",
    },
    "columns": [
        { "data": "code" },
        { "data": "description" }
    ]
 });
}

For events other than load (say button click):

    var newUrl = 'testTableData.html?action=search';
    myTable.api().ajax.url(newUrl).load();

This was the one I had to take up without modifications to table init that would cause errors.

Thank you @JSelser and @davidkonrad for all your suggestions :)

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