In the method getSheetTabData of SheetAPI, it allows user get the sheet tab data. .
Here comes the code example
var json = SHEET_API.getSheetTabData(SHEET_API_HD);
alert(Ext.encode(json));
Return back is an array of sheet json data object as following. You can get sheet id, sheet name, color from this array.
[{
id: 1,
name: 'sheet 1',
actived: true,
color: 'red',
},{
id: 2,
name: 'sheet 2',
color: 'red',
}]