ExtJS Assigning value to the hidden field - extjs

Question

I have the below combobox set to put some records through API call and then display on the page. I need to submit 2 values when user clicks submit, 1) gmiExchangeCode and 2) gmiFuturesCode. The first value works through this form's field, the gmiFuturesCode doesn't work on updating the hidden form field.
}, {
xtype: 'combo',
autoLoad: true,
hideTrigger: true,
fieldLabel: 'Product',
displayField: 'gmiDescription',
valueField: 'gmiExchangeCode',
submitValue: true,
name: 'exchange',
queryMode: 'remote',
queryParam: 'entry',
typeAhead: true,
minChar: 2,
tpl: new Ext.XTemplate('<tpl for="."><div class="x-boundlist-item" style="border-bottom:1px solid #757575;">{gmiExchangeCode} - {lisaMarket} - {gmiFuturesCode} - {gmiDescription}</div></tpl>'),
store: {
fields: ['text', 'value'],
proxy: {
type: 'ajax',
url: 'API',
reader: {
type: 'json'
}
}
},
listeners: {
select: function (combo, record, index) {
hidden.setValue(record.get('gmiFuturesCode'));
}
}
}, {
xtype: 'hidden',
id: 'futures',
name: 'futures'
}, {

Answer 1

There is nothing called "hidden.setValue()" you have to get the object using the query selector or Ext.getCmp('ObjectID')
Here is a working Example Fiddle
Ext.create('Ext.form.Panel', {
title: 'test',
width: 400,
height: 300,
renderTo: Ext.getBody(),
items: [{
xtype: 'combobox',
reference: 'states',
publishes: 'value',
fieldLabel: 'Select State',
displayField: 'displayField',
anchor: '-15',
store: {
fields: ['valueField', 'displayField'],
data: [
['1', 'MyDisplayValueFor1'],
['2', 'MyDisplayValueFor2'],
['3', 'MyDisplayValueFor3']
]
},
minChars: 0,
queryMode: 'local',
typeAhead: true,
listeners: {
select: function (combo, record, index) {
console.log(record.get('displayField'));
Ext.getCmp('futures').setValue(record.get('displayField'));
Ext.Msg.alert('Alert', 'The hidden Field value from the getter is : ' + Ext.getCmp('futures').getValue());
}
}
}, {
xtype: 'hidden',
id: 'futures',
name: 'futures'
}]
})

Answer 2

Try this
Ext.getCmp('futures').setValue(record.get('gmiFuturesCode'));