javascript - Extjs Combo return array and not only integer -

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i use combobox extjs.

when submit form return of combobox array. need string...

the return : 

{"data":{"idapourmutuelle":"","idorganisme":["","1"],"idpersonne":"3","mutuelle":""}}

and combobox:

xtype: 'combobox', anchor: '100%', fieldlabel: 'nom', name: 'idorganisme', allowblank: false, editable: false, displayfield: 'mutuelle', hiddenname: 'idorganisme', store: 'mutuelle', valuefield: 'idorganisme'


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