在 jquery DataTables 中从渲染中跳过一行

问题描述

如果在初始化期间满足条件，我想跳过行渲染，但是我不知道将它放在哪里.

I want to skip row rendering if a condition is met during its initialization, however I dont know where exactly to place it.

我应该把它放在 fnCreatedRow 还是 fnPreDrawCallback 中?
我该怎么做?

Should I put it in fnCreatedRow or fnPreDrawCallback?
And how can I do that?

这是我的代码:

 var users_tbl =$('#users_tbl');
    users_tbl.DataTable({
        "deferRender": true,
        "autoWidth": false,
        //for reinitialisation purpose
        destroy: true,
        "aLengthMenu": [[20, 40, 50, 100, -1], [20, 40, 50, 100, "All"]],
        "order": [[ 0, "DESC" ]],
        "ajax" : {
                url :  Main.Vars.host + "settings/get_users",
                type : "GET",
            },
            "aoColumnDefs": [

                    { "sWidth": "5%", "aTargets": [ 0 ] },
                    { "sWidth": "20%", "aTargets": [ 1 ] },
                    { "sWidth": "25%", "aTargets": [ 2 ] },
                    { "sWidth": "15%", "aTargets": [ 3 ] },
                    { "sWidth": "5%", "aTargets": [ 4 ] },
            ],
           "fnCreatedRow"  : function( nRow, aData, iDataIndex ){
                $(nRow).addClass('item-context');

               return false;
            },
            "fnPreDrawCallback": function( oSettings ) {
                console.log(oSettings);
            },
            "columns": [
                {
                    "data": "id",
                },
                {
                    "data": "username",
                },
                {
                   "render": function(data,type,row,meta) {
                        var owner = row.pnp_info.first_name + " " + row.pnp_info.last_name;
                        return owner;
                   }
                },
                {
                    "data": "created_on",

                },
                {
                   "render": function(data,type,row,meta) {
                        return row.active == 1 ? "YES" : "NO";
                   }
                },

            ],

            sPaginationType: "full_numbers",
    });

推荐答案

对于 fnCreatedRow 来说已经太晚了，对于 fnPreDrawCallback 来说，你最终会取消表格的渲染.你有两种不同的方式:

For fnCreatedRow it is too late, and for fnPreDrawCallback you just end up cancelling rendering of the table. You have two different ways :

1) 清理 ajax 中的 JSON.dataSrc 回调:

var table = $('#example').DataTable( {
    ajax : {
        url : 'test.json',
        dataSrc: function(json) {
            var rows = [];
            for (var i=0;i<json.data.length;i++) {
                //skip rows "if a condition is met"
                //here just any rows except row #1
                if (i>0) rows.push(json.data[i]);
            }
            return rows;
        }
    }
    ....
})

2) 在 xhr 事件:

table.on('xhr.dt', function (e, settings, json, xhr) {
    //manipulate the json directly, no return needed
    //delete row #1, same as above
    json.data.splice(0,1);
});

这两个例子都假设你已经在(简化的)表单上使用了格式良好的 JSON

Both examples is under assumption that you have wellformed JSON on the (simplified) form

{
 "data": [
     {
       "id": "2423",
       "username" : "joe"
     },
     {
       "id": "4321",
       "username" : "gordon"
     }
  ]
}

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