I read in Ext JS in Action ( by J. Garcia) that if we have an instance of Ext.data.Record, we can use the form's loadRecord method to set the form's values. However, he does not give a working example of this (in the example that he uses data is loaded into a form through a file called data.php). I have searched many forums and found the following entry helpful as it gave me an idea on how to solve my problem by using form's loadRecord method: load data from grid to form

Now the code for my store and grid is as follows:

var userstore = Ext.create('Ext.data.Store', {
  storeId: 'viewUsersStore',
  model: 'Configs',
  autoLoad: true,
  proxy: {
    type: 'ajax',
    url: '/user/getuserviewdata.castle',
    reader: {
      type: 'json',
      root: 'users'
    },
    listeners: {
      exception: function (proxy, response, operation, eOpts) {
        Ext.MessageBox.alert("Error", "Session has timed-out. Please re-login and try again.");
      }
    }
  }
});

var grid = Ext.create('Ext.grid.Panel', {
  id: 'viewUsersGrid',
  title: 'List of all users',
  store: Ext.data.StoreManager.lookup('viewUsersStore'),
  columns: [
    { header: 'Username', dataIndex: 'username' },
    { header: 'Full Name', dataIndex: 'fullName' },
    { header: 'Company', dataIndex: 'companyName' },
    { header: 'Latest Time Login', dataIndex: 'lastLogin' },
    { header: 'Current Status', dataIndex: 'status' },
    { header: 'Edit',
      menuDisabled: true,
      sortable: false,
      xtype: 'actioncolumn',
      width: 50,
      items: [{
        icon: '../../../Content/ext/img/icons/fam/user_edit.png',
        tooltip: 'Edit user',
        handler: function (grid, rowIndex, colIndex) {
          var rec = userstore.getAt(rowIndex);
          alert("Edit " + rec.get('username')+ "?");
          EditUser(rec.get('id'));
        }
      }]
    },
  ]
});

function EditUser(id) {
  //I think I need to have this code here - I don't think it's complete/correct though
  var formpanel = Ext.getCmp('CreateUserForm');
  formpanel.getForm().loadRecord(rec);
}

'CreateUserForm' is the ID of a form that already exists and which should appear when user clicks on Edit icon. That pop-up form should then automatically be populated with the correct data from the grid row.

However my code is not working. I get an error at the line 'formpanel.getForm().loadRecord(rec)' - it says 'Microsoft JScript runtime error: 'undefined' is null or not an object'.

Any tips on how to solve this?