jqGrid and dynamic column binding

问题:

How to bind jqGrid dynamically?. The columns are not available at design time but will only be available only at runtime.

In the current jqGrid design the colmodels and other properties needs to be pre-populated for the grid to work correctly.

Any input in this direction is greatly appreciated.

回答1:

Try this in document.ready:

$.ajax(
    {
       type: "POST",
       url: "SomeUrl/GetColumnsAndData",
       data: "",
       dataType: "json",
       success: function(result)
       {
            colD = result.colData;
            colN = result.colNames;
            colM = result.colModel;

            jQuery("#list").jqGrid({
                jsonReader : {
                    cell: "",
                    id: "0"
                },
                url: 'SomeUrl/Getdata',
                datatype: 'jsonstring',
                mtype: 'POST',
                datastr : colD,
                colNames:colN,
                colModel :colM,
                pager: jQuery('#pager'),
                rowNum: 5,
                rowList: [5, 10, 20, 50],
                viewrecords: true
            })
       },
       error: function(x, e)
       {
            alert(x.readyState + " "+ x.status +" "+ e.msg);   
       }
    });
setTimeout(function() {$("#list").jqGrid('setGridParam',{datatype:'json'}); },50);

this work fine for me.

回答2:

My solution is kind of the same idea as Teoman Shipahi's excellent answer from August 2015.

I have a web service which returns a set of JSON data, but the actual columns could vary over time.

What I wanted to do was hide some of the JSON columns in my jqGrid, and set the widths of some of the columns based on if this particular JSON field was one of the important fields (in this case, SegmentName).

Here's what I came up with:

$(function () {
    //  Load the JSON data we'll need to populate our jqGrid

    // ID of a [Segment_Set] record in our database (which our web service will load the data for.
    var SegmentSetId = 12345;

    $.ajax(
    {
        type: "GET",
        url: "/Service1.svc/LoadSegmentAttributes/" + SegmentSetId,
        dataType: "json",
        success: function (JSONdata) {
            // 
            //  Work through our JSON data, and create the two arrays needed by jqGrid 
            //  to display this dynamic data.
            //
            var listOfColumnModels = [];
            var listOfColumnNames = [];

            for (var prop in JSONdata[0]) {
                if (JSONdata[0].hasOwnProperty(prop)) {
                    //  We have found one property (field) in our JSON data.
                    //  Add a column to the list of Columns which we want our jqGrid to display
                    listOfColumnNames.push(prop);

                    //  How do we want this field to be displayed in our jqGrid ?
                    var bHidden = (prop == "SegmentID") || (prop == "SegmentSequenceInx");
                    var columnWidth = (prop == "SegmentName") ? 200 : 50;

                    listOfColumnModels.push({
                        name: prop,
                        width: columnWidth,
                        sortable: true,
                        hidden: bHidden
                    });
                }
            }

            //  Now we have our JSON data, and list of Column Headings and Models, we can create our jqGrid.
            CreateJQGrid(JSONdata, listOfColumnModels, listOfColumnNames);
        }
    });
});

And here's the function which creates the jqGrid:

function CreateJQGrid(JSONdata, listOfColumnModels, listOfColumnNames) {
    //  After loading the JSON data from our webservice, and establishing the list of 
    //  Column Names & Models, we can call this function to create the jqGrid.
    $("#SegmentRulesGrid").jqGrid({

        datatype: "local",
        data: JSONdata,
        localReader: {
            id: "SegmentID",        //  The Primary Key field in our JSONdata 
            repeatitems: false
        },
        mtype: "GET",
        colNames: listOfColumnNames,
        colModel: listOfColumnModels,
        rowNum: 15,
        loadonce: true,
        gridview: true,
        autowidth: true,
        height: 350,
        pager: '#pager',
        rowList: [15, 30, 100, 300],
        rownumbers: true,
        viewrecords: true,
        caption: 'Segment Rules',
    });
}

Hope this helps.

Obviously one downside to my solution is that it insists that you load all of your JSON data before displaying it in a grid, rather than loading just one page of the data at a time. This could be a problem if you have a huge amount of data.

回答3:

If somebody wants to implement this functionality using mvc then http://blog.lieberlieber.com/2010/07/07/asp-net-mvc-and-a-generic-jqquery-grid-jqtgrid/ is a nicer solution.

回答4:

Is it feasible to recreate the grid each time a column is added? You could store the data locally and just Unload / Recreate the grid each time, using a dynamic column model.

You may also want to look at some of the demos that show/hide columns dynamically. Depending upon how many columns you have, you might be able to use the same concept in your application.

Does that help?

回答5:

Yet another solution;

 $("#datagrid").jqGrid({
        //url: "user.json",
        //datatype: "json",
        datatype: "local",
        data: dataArray,
        colNames:getColNames(dataArray[0]),
        colModel:getColModels(dataArray[0]),
        rowNum:100,
        loadonce: true,
        pager: '#navGrid',
        sortname: 'SongId',
        sortorder: "asc",
        height: "auto", //210,
        width:"auto",
        viewrecords: true,
        caption:"JQ GRID"
    });

    function getColNames(data) {
        var keys = [];
        for(var key in data) {
            if (data.hasOwnProperty(key)) {
                keys.push(key);
            }
        }

        return keys;
    }

    function  getColModels(data) {
        var colNames= getColNames(data);
        var colModelsArray = [];
        for (var i = 0; i < colNames.length; i++) {
            var str;
            if (i === 0) {
                str = {
                    name: colNames[i],
                    index:colNames[i],
                    key:true,
                    editable:true
                };
            } else {
                str = {
                    name: colNames[i],
                    index:colNames[i],
                    editable:true
                };
            }
            colModelsArray.push(str);
        }

        return colModelsArray;
    }

回答6:

function columnsData(Data) {
    var str = "[";
    for (var i = 0; i < Data.length; i++) {
        str = str + "{name:'" + Data[i] + "', index:'" + Data[i] + "', editable: true}";
        if (i != Data.length - 1) {
            str = str + ",";
        }
    }
    str = str + "]";
    return str;
}

回答7:

I've tried solution suggested by bruno both with json and jsonstring type of data return, it works BUT
if option datastr : colD
  exists - further requests for data do not execute, though filter does work on first retrieved data
  do not exist - double request for data on grid loading

回答8:

I would suggest to execute $("#list").jqGrid('setGridParam',{datatype:'json'}); on loadComplete event of the grid - this way the grid will exist for sure. So, just add the following to the grid definition instead of setTimeout(...) :

loadComplete : function () {
    $ ("#list").jqGrid('setGridParam',{datatype:'json'});
}

Worked for me !

回答9:

If you do it with the import feature, you can still utilize the paging features of jqGrid. Make sure "GetColumnsAndData" returns normal grid data as "data" and the configuration as "grid" (or change these values in "jsonGrid").

EDIT: Also make sure one of the "grid" settings returned is "url" (with a URL value to retrieve only data).

$('#grid').jqGridImport({
    imptype: 'json',
    impurl: 'SomeUrl/GetColumnsAndData',
    mtype: 'POST',
    impData: {
        '_search': 'false',
        'sidx': 'loc_short_name',
        'sord': 'asc',
        'page': '1',
        'rows': '25',
        'searchField': '',
        'searchOper': '',
        'searchString': ''
        // Add any additional, custom criteria
    },
    jsonGrid: {
        config: 'grid',
        data: 'data'
    }
});

回答10:

**Dynamic JQGrid From Data Table**
$(document).ready(function () {
        var ColN, ColM, ColD, capEN;
        var sPath = window.location.pathname;
        var sPage = sPath.substring(sPath.lastIndexOf('/') + 1);
        //alert(sPage);
        $.ajax({
            url: sPage+'?method=getGridHeadData',
            type: "POST",
            contentType: "application/json; charset=utf-8",
            data: {},
            dataType: "json",
            success: function (data, st) {
                if (st == "success") {
                    ColN = data.rowsHead;//jqgrid heading data
                    ColM = data.rowsM; // its column model
                    ColD = data.rows; // Data
                    createGrid();
                }
            },
            error: function () {
                alert("Error with AJAX callback");
            }
        });

        function createGrid() {
            jQuery("#AccountingCodesGrid").jqGrid({

                datatype: 'json',
                url: sPage+'?method=getGridData',
                mtype: 'POST',
                ajaxGridOptions: { contentType: 'application/json; charset=utf-8' },
                serializeGridData: function (postData) {
                    return JSON.stringify(postData);
                },
                jsonReader: { repeatitems: false, root: "rows", page: "page", total: "total", records: "records" },

                //data: ColD,
                colNames: ColN,
                colModel: ColM,
                loadonce: true,
                pager: jQuery('#pager'),
                rowNum: 5,
                rowList: [5, 10, 20, 50],
                viewrecords: true
            })


        }
        jQuery("#AccountingCodesGrid").jqGrid('navGrid', '#Pager', { edit: false, add: false, del: false }, null, null, true, { multipleSearch: true });
        var height = $(window).height();


    });

the code behind
 **In page load..................................................................**

if (Request.QueryString["method"] == "getGridData")
            {
                Request.InputStream.Position = 0;
                StreamReader ipStRdr = new StreamReader(Request.InputStream);
                string json = ipStRdr.ReadToEnd();
                JavaScriptSerializer jser = new JavaScriptSerializer();
                Dictionary<string,> dict = jser.Deserialize<dictionary><string,>>(json);

                getGridData(int.Parse(dict["page"].ToString()), int.Parse(dict["rows"].ToString()), bool.Parse(dict["_search"].ToString()), dict["sord"].ToString());
                Response.End();
            }
            else if (Request.QueryString["method"] == "getGridHeadData")
            {
                getGridHeadData();
                Response.End();
            }

**Method to get data in json form----------------------------------------------------**
public void getGridData(int page, int rows, bool _search, string sord)
        {
            DataTable dtRecords = dtSource;// Data Table
            int recordsCount = dtRecords.Rows.Count;

            JqGridData objJqGrid = new JqGridData();
            objJqGrid.page = page;
            objJqGrid.total = ((recordsCount + rows - 1) / rows);
            objJqGrid.records = recordsCount;
            objJqGrid.rows = ConvertDT(dtRecords);

            List<string> liob = new List<string>();
            foreach (DataColumn column in dtRecords.Columns)
            {
                liob.Add(column.ColumnName);
            }
            objJqGrid.rowsHead = liob;

            List<object> colcontetn = new List<object>();
            foreach (var item in liob)
            {
                JqGridDataHeading obj = new JqGridDataHeading();
                obj.name = item.ToString();
                obj.index = item.ToString();
                colcontetn.Add(obj);
            }
            objJqGrid.rowsM = colcontetn;

            JavaScriptSerializer jser = new JavaScriptSerializer();
            Response.Write(jser.Serialize(objJqGrid));

        }

回答11:

try this on

$.ajax(
    {
       type: "POST",
       url: "SomeUrl/GetColumnsAndData",
       data: "",
       dataType: "json",
       success: function(result)
       {
            colD = result.colData;
            colN = result.colNames;
            colM = result.colModel;

            jQuery("#list").jqGrid({
                jsonReader : {
                    cell: "",
                    id: "0"
                },
                url: 'SomeUrl/Getdata',
                datatype: 'jsonstring',
                mtype: 'POST',
                datastr : colD,
                colNames:colN,
                colModel :colM,
                pager: jQuery('#pager'),
                rowNum: 5,
                rowList: [5, 10, 20, 50],
                viewrecords: true
            })
       },
       error: function(x, e)
       {
            alert(x.readyState + " "+ x.status +" "+ e.msg);   
       }
    });
setTimeout(function() {$("#list").jqGrid('setGridParam',{datatype:'json'}); },50);