1. Create a new module or identify the existing module where you want to add the custom JavaScript code.

2. Inside your module, create a new JavaScript file, let's call it custom_script.js, and add your custom JavaScript code in it. For example:

odoo.define('your_module.custom_script', function (require) {
    "use strict";

    var FormController = require('web.FormController');
    var core = require('web.core');

    FormController.include({
        _onFieldChanged: function (event) {
            this._super.apply(this, arguments);

            var record = this.model.get(event.target.dataset.recordId);
            var fieldName = event.target.name;

            #your custom logic based on the changed field value
            if (fieldName === 'your_field_name') {
                var fieldValue = record.data[fieldName].res_id;
                # Perform actions based on the field value change
                # ....
            }
        },
    });
});


note;make sure add the js file reference in xml file

Hi,

You need to include your custom event inside form controller.

var FormController = require("web.FormController");
FormController.include({
    events: {
        'change #any_field': '_onChange',
        },
_onChange: function (event) {
        //Do what you want
}
});

Regards

odoo.define('hx_tsl.autosave',function(require){
    "use strict";
    var  FormController= require('web.FormController');
    console.log("enter");
    FormController.include({
       events: {
            'change #is_return': '_onChange',
            },
        _onChange: function (event) {
             console.log("value changed!")
        },

        }
    });

})

it seems does not work in odoo16 community edition.  "enter"  was printed,but   "value changed" not printed.