javascript - 管道数据以减少分页的 Ajax 调用不显示第二次调用的表数据

Question

我正在尝试实现 dataTable.pipeline。在页面加载时，数据在表中正确显示，但在单击（搜索、下一步、无条目）时，它正在获取 json 数据但不显示它。它仅在第二次调用服务器时发生。它只显示：正在处理...

我的代码如下所示：

<div class="table-responsive">
    <div class="row">
        <div class="col-sm-12 manage-stl">
            <table id="example" class="display zero-configuration" style="width:100%">
                <thead>
                    <tr>
                        <th>#</th>
                        <th>FIRST NAME</th>
                        <th>LAST NAME</th>
                        <th>ADDED ON</th>
                        <th>PHONE NUMBER</th>
                        <th>EMAIL ID</th>
                        <th>STATUS</th>
                        <th>ACTION</th>
                    </tr>
                </thead>
                <tfoot>
                    <tr>
                        <th>#</th>
                        <th>FIRST NAME</th>
                        <th>LAST NAME</th>
                        <th>ADDED ON</th>
                        <th>PHONE NUMBER</th>
                        <th>EMAIL ID</th>
                        <th>STATUS</th>
                        <th>ACTION</th>
                    </tr>
                </tfoot>
            </table>
        </div>
    </div>
</div>
<script type="text/javascript">
        //
    // Pipelining function for DataTables. To be used to the `ajax` option of DataTables
    //
    $.fn.dataTable.pipeline = function ( opts ) {
        // Configuration options
        var conf = $.extend( {
            pages: 5,     // number of pages to cache
            url: '',      // script url
            data: null,   // function or object with parameters to send to the server
                          // matching how `ajax.data` works in DataTables
            method: 'GET' // Ajax HTTP method
        }, opts );
     
        // Private variables for storing the cache
        var cacheLower = -1;
        var cacheUpper = null;
        var cacheLastRequest = null;
        var cacheLastJson = null;
     
        return function ( request, drawCallback, settings ) {
            var ajax          = false;
            var requestStart  = request.start;
            var drawStart     = request.start;
            var requestLength = request.length;
            var requestEnd    = requestStart + requestLength;
             
            if ( settings.clearCache ) {
                // API requested that the cache be cleared
                ajax = true;
                settings.clearCache = false;
            }
            else if ( cacheLower < 0 || requestStart < cacheLower || requestEnd > cacheUpper ) {
                // outside cached data - need to make a request
                ajax = true;
            }
            else if ( JSON.stringify( request.order )   !== JSON.stringify( cacheLastRequest.order ) ||
                      JSON.stringify( request.columns ) !== JSON.stringify( cacheLastRequest.columns ) ||
                      JSON.stringify( request.search )  !== JSON.stringify( cacheLastRequest.search )
            ) {
                // properties changed (ordering, columns, searching)
                ajax = true;
            }
             
            // Store the request for checking next time around
            cacheLastRequest = $.extend( true, {}, request );
     
            if ( ajax ) {
                // Need data from the server
                if ( requestStart < cacheLower ) {
                    requestStart = requestStart - (requestLength*(conf.pages-1));
     
                    if ( requestStart < 0 ) {
                        requestStart = 0;
                    }
                }
                 
                cacheLower = requestStart;
                cacheUpper = requestStart + (requestLength * conf.pages);
     
                request.start = requestStart;
                request.length = requestLength*conf.pages;
                request._token = "{{ csrf_token() }}";
     
                // Provide the same `data` options as DataTables.
                if ( typeof conf.data === 'function' ) {
                    // As a function it is executed with the data object as an arg
                    // for manipulation. If an object is returned, it is used as the
                    // data object to submit
                    var d = conf.data( request );
                    if ( d ) {
                        $.extend( request, d );
                    }
                }
                else if ( $.isPlainObject( conf.data ) ) {
                    // As an object, the data given extends the default
                    $.extend( request, conf.data );
                }
     
                return $.ajax( {
                    "type":     conf.method,
                    "url":      conf.url,
                    "data":     request,
                    "dataType": "json",
                    "cache":    false,
                    "success":  function ( json ) {
                        console.log(json);
                        cacheLastJson = $.extend(true, {}, json);
                        console.log("drawStart:"+drawStart);
                        if ( cacheLower != drawStart ) {
                            console.log("first");
                            json.data.splice( 0, drawStart-cacheLower );
                        }
                        if ( requestLength >= -1 ) {
                            console.log("second");
                            json.data.splice( requestLength, json.data.length );
                        }
                         
                        drawCallback( json );
                    }
                } );
            }
            else {
                json = $.extend( true, {}, cacheLastJson );
                json.draw = request.draw; // Update the echo for each response
                json.data.splice( 0, requestStart-cacheLower );
                json.data.splice( requestLength, json.data.length );
     
                drawCallback(json);
            }
        }
    };
     
    // Register an API method that will empty the pipelined data, forcing an Ajax
    // fetch on the next draw (i.e. `table.clearPipeline().draw()`)
    $.fn.dataTable.Api.register( 'clearPipeline()', function () {
        return this.iterator( 'table', function ( settings ) {
            settings.clearCache = true;
        } );
    } );
     
     
    //
    // DataTables initialisation
    //
    $(document).ready(function() {
        $('#example').DataTable( {
            "processing": true,
            "serverSide": true,
            // "order": [],
            "ajax": $.fn.dataTable.pipeline( {
                url: "{{route('admin.client.getAjaxDatatableList')}}",
                pages: 2 // number of pages to cache
            } )
        } );
    } );
</script>

我还包括这 3 个：

https://code.jquery.com/jquery-3.5.1.js

https://cdn.datatables.net/1.10.22/js/jquery.dataTables.min.js

https://cdn.datatables.net/1.10.22/css/jquery.dataTables.min.css

这个你能帮我吗。

标签： javascripthtmljquerydatatablespipeline