离开网站后,在localStorage中保存jqGrid的状态

Question

我想保存jqGrid(排序列,排序顺序,列宽,工具栏搜索字段)的状态,当用户离开站点并在他返回站点时恢复网格.

我的第一次尝试是使用该getGridParam方法加载数据,然后使用JSON对其进行序列化,并将其作为JSON-String保存在cookie中.但是cookie没有足够的空间来保存gridParam.所以我决定使用localstorage来保存Grid的状态.我的代码看起来像这样:

$(window).unload(function () {
    // Load GridParam
    var gridData = $('#Grid').jqGrid('getGridParam')};
    // Serialize it to as JSON-String
    var gridDataAsString = $.toJSON(gridData);
    // Save the serialized Griddata in the localStorage
    localStorage.setItem("GridParam", gridDataAsString);
});

这很好用.但是在下一步中我从localStroage加载GridParam并尝试恢复网格.加载数据也没问题.在调试模式下,我可以看到所有数据都是从localStorage正确加载的.但是,如果我想使用该setGridParam方法恢复网格,则网格具有所有默认值.我的代码如下所示:

$(document).ready(function () {
    $("#Grid").jqGrid({ /* Initialize the grid with default values */ });

    var loadedGridDataAsString = localStorage.getItem("GridParam");
    // Use the default value if no data exists in localStorage
    if (loadedGridDataAsString != null) {
        // Deserialize the JSON-String to an object
        var loadedGridData = $.evalJSON(loadedGridDataAsString);
        $("#Grid").jqGrid('setGridParam', loadedGridData);
        $("#Grid").trigger('reloadGrid');
    }
}

Answer 1

这就是我保存网格状态的方式(作为隐藏字段中的json数据,而不是localstorage,但想法应该是相同的).

将网格参数保存为隐藏字段中的JSON:

 function saveGridParameters(grid) {       
            var gridInfo = new Object();

            gridInfo.url = grid.jqGrid('getGridParam', 'url');
            gridInfo.sortname = grid.jqGrid('getGridParam', 'sortname');
            gridInfo.sortorder = grid.jqGrid('getGridParam', 'sortorder');
            gridInfo.selrow = grid.jqGrid('getGridParam', 'selrow');
            gridInfo.page = grid.jqGrid('getGridParam', 'page');
            gridInfo.rowNum = grid.jqGrid('getGridParam', 'rowNum');
            gridInfo.postData = grid.jqGrid('getGridParam', 'postData');
            gridInfo.search = grid.jqGrid('getGridParam', 'search');

            $('#gridParams').val(JSON.stringify(gridInfo));
        }

加载保存的数据:(我将保存的数据加载到网格的beforeRequest事件中):

                beforeRequest: function() //loads the jqgrids state from before save
                {
                    if(gridParams !=null && gridParams!="")
                    {                            
                        var gridInfo = $.parseJSON(gridParams);                                    
                        var grid = $('#ReportPartsGrid');                           

                        grid.jqGrid('setGridParam', { url: gridInfo.url });
                        grid.jqGrid('setGridParam', { sortname: gridInfo.sortname });
                        grid.jqGrid('setGridParam', { sortorder: gridInfo.sortorder });
                        grid.jqGrid('setGridParam', { selrow: gridInfo.selrow });
                        grid.jqGrid('setGridParam', { page: gridInfo.page });
                        grid.jqGrid('setGridParam', { rowNum: gridInfo.rowNum });
                        grid.jqGrid('setGridParam', { postData: gridInfo.postData });
                        grid.jqGrid('setGridParam', { search: gridInfo.search });

                        gridParams = '';
                        $('#ReportPartsGrid').trigger('reloadGrid');                           
                    }                                               
                },