checkbox always return false using prop (jquery)

[it12uw]

the checbox value always return false after i checked the check box.

this is the xml code

<div class="col-md-6"> <group name="mesin" string="Pilih Line Mesin"> <field name="deret_value" widget="radio" options="{'horizontal' : True}" class="radio-line" id="radio-line"/> </group> </div> <div class="col-md-8"> <div class="radio-mesin"> <group name="layout_mesin" string="Layout Mesin"> <field name="mesin_produksi_id" domain="[('deret', '=', deret_value)]" options="{'horizontal': True}" widget="radio" class="radio-mesin" id="radio-mesin"/> </group> </div> </div> <div class="col-md-8"> <group name="kerusakkan" string="Pilih Kerusakkan"> <field name="putus_lusi" class="custom_checkbox" /> <field name="putus_pakan" class="custom_checkbox"/> <field name="bendera_merah" class="custom_checkbox"/> <field name="ambrol" class="custom_checkbox"/> <field name="dedel" class="custom_checkbox"/> </group> <group> <field name="hb" class="custom_checkbox"/> <field name="naik_beam" class="custom_checkbox"/> <field name="oh" class="custom_checkbox"/> <field name="preventif" class="custom_checkbox"/> </group> <group> <field name="lain_lain" string="Keterangan/Lain Lain" placeholder="Isi Keterangan Disini" style="text-align:center;" class="keterangan"/> </group>

javascript code

`_onClickButton: function () {
var self = this;
var deret_value = $('input[name="deret_value"]:checked').val();
var mesin_produksi_id = $('input[name="mesin_produksi_id"]:checked').val();
var putus_lusi = $('input[data-field="putus_lusi"]').is(":checked");
var putus_pakan = $('input[data-field="putus_pakan"]').is(":checked");
var bendera_merah = $('input[data-field="bendera_merah"]').is(":checked");
var ambrol = $('input[data-field="ambrol"]').is(":checked");
var dedel = $('input[data-field="dedel"]').is(":checked");
var hb = $('input[data-field="hb"]').is(":checked");
var naik_beam = $('input[data-field="naik_beam"]').is(":checked");
var oh = $('input[data-field="oh"]').is(":checked");
var preventif = $('input[data-field="preventif"]').is(":checked");

var lain_lain = $('textarea[data-field="lain_lain"]').val();

this.saveDataSnap({
    deret_value: deret_value,
    mesin_produksi_id: mesin_produksi_id,
    putus_lusi: putus_lusi,
    putus_pakan: putus_pakan,
    bendera_merah: bendera_merah,
    ambrol: ambrol,
    dedel: dedel,
    hb: hb,
    naik_beam: naik_beam,
    oh: oh,
    preventif: preventif,
    lain_lain: lain_lain,
});

},
`