Application of embedding Dynamic combobox in grid in extjs

Use combobox data Copy codeThe Code is as follows: comboDS = new Ext. data. JsonStore ({
Url: 'test. do ',
Fields :[{
Name: 'id'
},{
Name: 'display'
}]
});

Combobox Definition
The id in combobox must be included, and the value of combobox must be followed by the Data id.Copy codeThe Code is as follows: var comboBox = new Ext. form. ComboBox ({
Id: "cb", // required
TypeAhead: true,
ReadOnly: true,
AllowBlank: false,
AutoScroll: true,
SelectOnFocus: true,
EmptyText: 'select ...',
Store: comboDS,
ForceSelection: true,
TriggerAction: 'all ',
DisplayField: 'display ',
ValueField: 'id'
});

Grid definition:Copy codeThe Code is as follows: ds = new Ext. data. Store ({
Baseparams :{
Start: 0,
Limit: RowCount
},
Proxy: new Ext. data. HttpProxy ({
Url: 'test2. do'
}),
Reader: new Ext. data. JsonReader ({
Root: 'data ',
TotalProperty: 'totalcount'
},[{
Name: "bh"
},{
Name: "test"
}]);
});
Var cm = new Ext. grid. ColumnModel ([new Ext. grid. RowNumberer (),{
Header: "No ",
DataIndex: "bh"
},{
Header: "test ",
DataIndex: "test ",
Renderer: renderer,
Editor: comboBox
}]);
Grid = new Ext. grid. EditorGridPanel ({
Title: 'test ',
Ds: ds,
Cm: cm,
ClicksToEdit: 1,
ViewConfig :{
ForceFit: true
},
Bbar: new Ext. PagingToolbar ({
PageSize: RowCount,
Store: ds,
DisplayInfo: true,
DisplayMsg: 'display records from {0} to {1}, total records from {2 ',
EmptyMsg: "No record"
})
});

Renderer function of cm
This method is used to solve the problem. After the combobox is modified, it is displayed as id.Copy codeThe Code is as follows: function renderer (value, p, r ){
Var index = comboDS. find (Ext. getCmp ('cb '). valueField, value );
Var record = comboDS. getAt (index );
Var displayText = "";
If (record = null ){
DisplayText = value;
} Else {
DisplayText = record. data. display; // obtain the value of the display field in the dataset in record.
}