javascript - providing a blank option in the combobox sapui5 -

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i trying populate dropdownbox in sapui5 json 

      new sap.ui.commons.dropdownbox(this.createid('inpexpensetype'), {                                 selectedkey: '{expensetype/id}',                                 editable: '{/caneditpayment}',                                 required: "{/caneditpayment}",                                 displaysecondaryvalues: true,                                 items: {                                     path: 'parameters>/benefits',                                     template: new sap.ui.core.listitem(this.createid('liexpensetype'), {                                         key: '{parameters>id}',                                         text: '{parameters>name}',                                         additionaltext: '{parameters>code}'                                     })                                 },                                 layoutdata: new sap.ui.layout.griddata({span: 'l6 m6 s6'})                             }).attachchange(oms.app.modelutils.handlelistitemchange)

now based on condition eg. if(status==='approved'), wish show 1 option in dropdownbox. used below filter done.

    if(state==='approved'){ //this option wish display in dropdownbox.         afilters.push(new sap.ui.model.filter("id", sap.ui.model.filteroperator.eq, "33"));     }     odropdownbox.binditems('parameters>/benefits', otemplate, null, afilters);

now problem single option getting defaulted in dropdownbox onchange event not triggered.

i tried default blank item below

   if(state==='approved'){         var oitem = new sap.ui.core.listitem({             key: 'dummy',             text: '',             additionaltext: ''         });         odropdownbox.insertitem(oitem,0);          odropdownbox.setselectedkey('dummy');     }

but not make difference , see single option populated default.

how can solve this? there clean way manipulate json list?

no need add new item.

use firechange after bind items have no issues.

odropdownbox.binditems('parameters>/benefits', otemplate, null, afilters); odropdownbox.firechange();

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