網格單元格中jqwidget下拉列表的數據庫綁定

Question

在jqwidget網格細胞示例中（在jqxGrid左側菜單下，打開編輯/編輯），在客戶端生成數據。 如何將dropdownlist綁定到asp .net MVC3項目中的數據庫？（您可以在demo選項卡的product列下看到dropdownlist）

Answer 1

使用數據庫初始化dropdownlist時，應將其綁定到datasource（或dataadapter），並應設置selectedIndex。 然后，對於行更新，所選值應保持選擇狀態。

列定義可能類似於：

{ text: 'Urun', columntype: 'dropdownlist', datafield: 'UrunAdi', width: 177,
                  initeditor: function (row, cellvalue, editor) {
                      var urunId = $('#jqxgrid').jqxGrid('getcellvalue', row, "UrunId");
                      editor.jqxDropDownList({ displayMember: 'UrunAdi', source: dropdownListAdapter, selectedIndex: urunId });
                      $(document).on('select', editor, function (event) {
                          selectedUrunId = editor.jqxDropDownList('getSelectedIndex');
                      });
                  }
}

變量“selectedUrunId”應該全局定義，可能像var selectedUrunId = -1; 在jqxgrid初始化之前。 然后在updaterow定義中（它在源定義中）應使用下拉列表的選定值。 它可能像：

if (selectedUrunId != undefined && selectedUrunId != -1) {
                    rowdata.UrunId = selectedUrunId;
                    selectedUrunId = -1;
                }

此場景的整體場景是：

        // prepare the data
        var gridSource = {
            datatype: "json",
            datafields: [{ name: 'KargoId' }, { name: 'UrunAdi' }, { name: 'UrunId', type: 'int' }],
            url: 'BindGrid',
            updaterow: function (rowid, rowdata) {
                // synchronize with the server - send update command  
                if (selectedUrunId != undefined && selectedUrunId != -1) {
                    rowdata.UrunId = selectedUrunId;
                    selectedUrunId = -1;
                }                   

                var data = $.param(rowdata);

                $.ajax({
                    dataType: 'json',
                    url: 'UpdateEditGrid',
                    data: data,
                    success: function (data, status, xhr) {
                        gridDataAdapter.dataBind();                            
                    },
                    error: function (xhr, status, error) {
                        alert(JSON.stringify(xhr));
                    }
                });
            }
        };

        var gridDataAdapter = new $.jqx.dataAdapter(gridSource);

        var dropdownSource = {
            datatype: "json",
            datafields: [{ name: 'UrunId' }, { name: 'UrunAdi'}],
            url: 'BindDropdown'
        };

        var selectedUrunId = -1;
        var dropdownListAdapter = new $.jqx.dataAdapter(dropdownSource);

        // initialize jqxGrid
        $("#jqxgrid").jqxGrid(
        {
            width: 670,
            source: gridDataAdapter,
            editable: true,
            theme: theme,
            selectionmode: 'singlecell',
            columns: [
              { text: '#', datafield: 'KargoId', width: 40 },                  
              { text: 'Urun', columntype: 'dropdownlist', datafield: 'UrunAdi', width: 177,
                  initeditor: function (row, cellvalue, editor) {
                      var urunId = $('#jqxgrid').jqxGrid('getcellvalue', row, "UrunId");
                      editor.jqxDropDownList({ displayMember: 'UrunAdi', source: dropdownListAdapter, selectedIndex: urunId });
                      $(document).on('select', editor, function (event) {
                          selectedUrunId = editor.jqxDropDownList('getSelectedIndex');
                      });
                  }
              }]
        });

Answer 2

您可以使用名為“createeditor”的函數並在其中初始化DropDownList。

列定義：

{ text: 'Proyecto', columntype: 'dropdownlist', datafield: 'jobid', width: 10,
                      createeditor: function (row, cellvalue, editor) {
                          editor.jqxDropDownList({ displayMember: 'displaylabel', valueMember: 'catalogvalue', source: dropdownListAdapter });
                      }
}

可以使用類似的代碼初始化DropDownList的數據適配器：

source = {
    datatype: "xml",
    datafields: [
    { name: 'CompanyName' },
    { name: 'ContactName' },
    { name: 'ContactTitle' },
    { name: 'City' },
    { name: 'Country' },
    { name: 'Address' }
    ],
    async: false,
    record: 'Table',
    url: 'Default.aspx/GetCustomers',
};
var dropdownListAdapter = new $.jqx.dataAdapter(source,
    {  contentType: 'application/json; charset=utf-8'}
);