jqGrid：使用本地数据类型加载嵌套子网格时出现问题

我正在尝试使用 jqGrid 和本地数据让嵌套子网格工作。我已经搜索了很多，但未能找到解决方案。这是我的代码的简化示例：

var mainGridData =
    [
        // main grid data
        { id: "m1", col1: "11", col2: "12" },
        { id: "m2", col1: "21", col2: "22" },
        { id: "m3", col1: "31", col2: "32" }
    ];
var firstSubgrid =
    {
        m1: [
            // data for subgrid for the id=m1
            { id: "s1a", c1: "aa", c2: "ab", c3: "ac" },
            { id: "s1b", c1: "ba", c2: "bb", c3: "bc" },
            { id: "s1c", c1: "ca", c2: "cb", c3: "cc" }
        ],
        m2: [
            // data for subgrid for the id=m2
            { id: "s2a", c1: "xx", c2: "xy", c3: "xz" }
        ]
    };
var secondSubgrid =
    {
        s1a: [
            // data for subgrid for the id=m1
            { id: "2s1a", d1: "2aa", d2: "2ab", d3: "2ac" },
            { id: "2s1b", d1: "2ba", d2: "2bb", d3: "2bc" },
            { id: "2s1c", d1: "2ca", d2: "2cb", d3: "2cc" }
        ],
        s2a: [
            // data for subgrid for the id=m2
            { id: "2s2a", d1: "xx", d2: "xy", d3: "xz" }
        ]
    };


//------------
$("#grid").jqGrid({
    datatype: 'local',
    data: mainGridData,
    colNames: ['Column 1', 'Column 2'],
    colModel: [
        { name: 'col1', width: 200 },
        { name: 'col2', width: 200 }
    ],
//Subgrid1...
    subGrid: true,
    subGridRowExpanded: function (subgridDivId, rowId) {
        var subgridTableId = subgridDivId + "_t";
        $("#" + subgridDivId).html("<table id='" + subgridTableId + "'></table>");
        $("#" + subgridTableId).jqGrid({
            datatype: 'local',
            data: firstSubgrid[rowId],
            colNames: ['Col 1', 'Col 2', 'Col 3'],
            colModel: [
                { name: 'c1', width: 100 },
                { name: 'c2', width: 100 },
                { name: 'c3', width: 100 }
            ],
      //Subgrid2...    
            subGrid: true,
            subGridRowExpanded: function (subgrid2DivId, subRowId2) {
                var subgrid2TableId = subgrid2DivId + "_t";
                $("#" + subgrid2DivId).html("<table id='" + subgrid2DivId + "'></table>");
                $("#" + subgrid2TableId).jqGrid({
                    datatype: 'local',
                    data: secondSubgrid[subRowId2],
                    colNames: ['Col 1', 'Col 2', 'Col 3'],
                    colModel: [
                        { name: 'd1', width: 100 },
                        { name: 'd2', width: 100 },
                        { name: 'd3', width: 100 }
                    ],
                });

            }                
        });
    }
});

有什么想法吗？

我觉得你的问题很有趣。我认为答案可能对许多其他人有帮助。因此，我编写了两个演示，演示如何实现需求。

第一个演示 http://www.ok-soft-gmbh.com/jqGrid/LocalSubgridMultileve1.htm基于来自的演示我之前的回答 https://stackoverflow.com/a/10178440/315935（它们基于另一个 https://stackoverflow.com/a/9165978/315935）您使用的代码已在您的问题文本中使用。我添加了这个技巧答案 https://stackoverflow.com/a/4538656/315935另外，还可以隐藏没有子网格的行的子网格图标（“+”）。

为了简化子网格数据的保存，我在每一行中添加了subgrid属性，其值是子网格的数据。这种保存数据的方式非常实用，因为 jqGrid 保存了行的完整项目，因此您不再需要任何隐藏列。要访问本地数据，我建议使用getLocalRow方法。看答案 https://stackoverflow.com/a/9145342/315935例如，获取更多信息或源代码 https://github.com/tonytomov/jqGrid/blob/v4.4.1/js/grid.base.js#L3534-L3545 of getLocalRow方法非常简单。

第一个demo的代码：

var myData = [
        // main grid data
        { id: "m1", col1: "11", col2: "12",
            subgrid: [
                // data for subgrid for the id=m1
                { id: "s1a", c1: "aa", c2: "ab", c3: "ac",
                    subgrid: [
                        // data for subgrid for the id=m1, subgridId=s1a
                        { id: "2s1a", d1: "2aa", d2: "2ab", d3: "2ac" },
                        { id: "2s1b", d1: "2ba", d2: "2bb", d3: "2bc" },
                        { id: "2s1c", d1: "2ca", d2: "2cb", d3: "2cc" }
                    ]},
                { id: "s1b", c1: "ba", c2: "bb", c3: "bc" },
                { id: "s1c", c1: "ca", c2: "cb", c3: "cc" }
            ]},
        { id: "m2", col1: "21", col2: "22",
            subgrid: [
                // data for subgrid for the id=m2
                { id: "s2a", c1: "xx", c2: "xy", c3: "xz",
                    subgrid: [
                        // data for subgrid for the id=m2, subgridId=s2a
                        { id: "2s2a", d1: "xx", d2: "xy", d3: "xz" }
                    ]}
            ]},
        { id: "m3", col1: "31", col2: "32" }
    ],
    removeSubgridIcon = function () {
        var $this = $(this);
        $this.find(">tbody>tr.jqgrow>td.ui-sgcollapsed").filter(function () {
            var rowData = $this.jqGrid("getLocalRow",
                    $(this).closest("tr.jqgrow").attr("id"));
            return rowData.subgrid == null;
        }).unbind("click").html("");
    },
    isHasSubrids = function (data) {
        var l = data.length, i;
        for (i = 0; i < l; i++) {
            if (data[i].subgrid != null) {
                return true;
            }
        }
        return false;
    };

$("#list").jqGrid({
    datatype: "local",
    data: myData,
    colNames: ["Column 1", "Column 2"],
    colModel: [
        { name: "col1", width: 200 },
        { name: "col2", width: 200 }
    ],
    gridview: true,
    rownumbers: true,
    autoencode: true,
    sortname: "col1",
    sortorder: "desc",
    height: "100%",
    pager: "#pager",
    caption: "Demonstrate how to create subgrid from local hierarchical data",
    subGrid: isHasSubrids(myData),
    loadComplete: function () {
        removeSubgridIcon.call(this);
    },
    subGridRowExpanded: function (subgridDivId1, rowId1) {
        var $subgrid1 = $("<table id='" + subgridDivId1 + "_t'></table>"),
            localRowData1 = $(this).jqGrid("getLocalRow", rowId1);
        $subgrid1.appendTo("#" + $.jgrid.jqID(subgridDivId1));
        $subgrid1.jqGrid({
            datatype: "local",
            data: localRowData1.subgrid,
            colNames: ["Colunm1", "Colunm2", "Colunm3"],
            colModel: [
                { name: "c1", width: 112 },
                { name: "c2", width: 112 },
                { name: "c3", width: 112 }
            ],
            gridview: true,
            rownumbers: true,
            autoencode: true,
            sortname: "c1",
            sortorder: "desc",
            height: "100%",
            loadComplete: removeSubgridIcon,
            subGrid: isHasSubrids(localRowData1.subgrid),
            subGridRowExpanded: function (subgridDivId2, rowId2) {
                var $subgrid2 = $("<table id='" + subgridDivId2 + "_t'></table>"),
                    localRowData2 = $(this).jqGrid("getLocalRow", rowId2);
                $subgrid2.appendTo("#" + $.jgrid.jqID(subgridDivId2));
                $subgrid2.jqGrid({
                    datatype: "local",
                    data: localRowData2.subgrid,
                    colNames: ["Col 1", "Col 2", "Col 3"],
                    colModel: [
                        { name: "d1", width: 90 },
                        { name: "d2", width: 90 },
                        { name: "d3", width: 90 }
                    ],
                    gridview: true,
                    rownumbers: true,
                    autoencode: true,
                    sortname: "d1",
                    sortorder: "desc",
                    height: "100%",
                    subGrid: isHasSubrids(localRowData2.subgrid),
                    loadComplete: removeSubgridIcon
                });
            }
        });
    }
});

第二个演示 http://www.ok-soft-gmbh.com/jqGrid/LocalSubgridMultileve2.htm是对之前的demo进行更深入的修改。它可用于创建非常深的多层子网格。我在演示中额外使用了密集型idPrefix简化 ids 的使用。我建议比较以下值id的项目的属性myData第一个演示和第二个演示中的数组。第二个演示的代码如下

var myData = [
        // main grid data
        { id: "1", col1: "11", col2: "12",
            subgrid: [
                // data for subgrid for the id=m1
                { id: "1", c1: "aa", c2: "ab", c3: "ac",
                    subgrid: [
                        // data for subgrid for the id=m1, subgridId=s1a
                        { id: "1", d1: "2aa", d2: "2ab", d3: "2ac" },
                        { id: "2", d1: "2ba", d2: "2bb", d3: "2bc" },
                        { id: "3", d1: "2ca", d2: "2cb", d3: "2cc" }
                    ]},
                { id: "2", c1: "ba", c2: "bb", c3: "bc" },
                { id: "3", c1: "ca", c2: "cb", c3: "cc" }
            ]},
        { id: "2", col1: "21", col2: "22",
            subgrid: [
                // data for subgrid for the id=m2
                { id: "1", c1: "1xx", c2: "1xy", c3: "1xz",
                    subgrid: [
                        // data for subgrid for the id=m2, subgridId=s2a
                        { id: "1", d1: "2xx", d2: "2xy", d3: "2xz" }
                    ]}
            ]},
        { id: "3", col1: "31", col2: "32" }
    ],
    removeSubgridIcon = function () {
        var $this = $(this),
            idPrefix = $this.jqGrid("getGridParam", "idPrefix");
        $this.find(">tbody>tr.jqgrow>td.ui-sgcollapsed").filter(function () {
            var rowData = $this.jqGrid("getLocalRow",
                    $.jgrid.stripPref(idPrefix, $(this).closest("tr.jqgrow").attr("id")));
            return rowData.subgrid == null;
        }).unbind("click").html("");
    },
    isHasSubrids = function (data) {
        var l = data.length, i;
        for (i = 0; i < l; i++) {
            if (data[i].subgrid != null) {
                return true;
            }
        }
        return false;
    },
    specificGridOptions = [
        {
            colNames: ["Column 1", "Column 2"],
            colModel: [
                { name: "col1" },
                { name: "col2" }
            ],
            cmTemplate: { width: 200 },
            sortname: "col1",
            sortorder: "desc",
            idPrefix: "s_",
            pager: "#pager",
            caption: "Demonstrate how to create subgrid from local hierarchical data"
        },
        {
            colNames: ["Colunm1", "Colunm2", "Colunm3"],
            colModel: [
                { name: "c1" },
                { name: "c2" },
                { name: "c3" }
            ],
            cmTemplate: { width: 112 },
            sortname: "c1",
            sortorder: "desc"
        },
        {
            colNames: ["Col 1", "Col 2", "Col 3"],
            colModel: [
                { name: "d1" },
                { name: "d2" },
                { name: "d3" }
            ],
            cmTemplate: { width: 90 },
            sortname: "d1",
            sortorder: "desc"
        }
    ],
    commonGridOptions = {
        datatype: "local",
        gridview: true,
        rownumbers: true,
        autoencode: true,
        height: "100%",
        loadComplete: function () {
            // one can use loadComplete: removeSubgridIcon, but I included
            // curent implementation of loadComplete only to show how to call
            // removeSubgridIcon from your loadComplete callback handler
            removeSubgridIcon.call(this);
        },
        subGridRowExpanded: function (subgridDivId, rowId) {
            var $subgrid = $("<table id='" + subgridDivId + "_t'></table>"),
                subgridLevel = $(this).jqGrid("getGridParam", "subgridLevel") + 1,
                parentIdPrefix = $(this).jqGrid("getGridParam", "idPrefix"),
                pureRowId = $.jgrid.stripPref(parentIdPrefix, rowId),
                localRowData = $(this).jqGrid("getLocalRow", pureRowId);
            $subgrid.appendTo("#" + $.jgrid.jqID(subgridDivId));
            $subgrid.jqGrid($.extend(true, {}, commonGridOptions, specificGridOptions[subgridLevel], {
                data: localRowData.subgrid,
                subGrid: isHasSubrids(localRowData.subgrid),
                subgridLevel: subgridLevel,
                idPrefix: rowId + "_",
                rowNum: 10000 // we use this to have no pager in the subgrids
            }));
        }
    };

$("#list").jqGrid($.extend(true, {}, commonGridOptions, specificGridOptions[0], {
    data: myData,
    subgridLevel: 0,
    subGrid: isHasSubrids(myData)
}));