ExtJS 2.0 Tip : How To Make ComboBox Send Value Field.

When you use ExtJS's ComboBox, if you don't set hidden name or id, it send display field value, not value field. To handle this, it has to be set. Be careful about uniqueness of the hidden name, for more details you can check ExtJS ComboBox's documantation

var unitField = new Ext.form.ComboBox({
   id:'unitField',
   name: 'unit',
   fieldLabel: 'Unit',
   store:unitStore,
   mode: 'remote',
   displayField: 'name',
   valueField: 'id',
   hiddenName : 'unitId'
   allowBlank: false,
   anchor:'95%',
   triggerAction: 'all'
});