I'm trying to store the result of checked checkboxes in local storage but when I try to save I get the error mentioned above.

Not quite sure what is undefined since I see the property in my code.
Here's the code:

var getCheckboxValue = function (){

    var checkboxes = document.forms[0].features;

    for(var i=0, j=checkboxes.length; i<j; i++){

        if(checkboxes[i].checked){

        console.log(checkboxes[i].value);

            //featuresValue = $(features).value();

        }else{

            checkboxes = No

        }

        }

    }



var storeData = function (){

    var id = Math.floor(Math.random()*10000001);

    //getSelectedRadio();

    getCheckboxValue();

    var item = {};

        item.brand = [Brand,$(brand).value];

        item.model = [Model,$(model).value];

        item.comments = [comments,$(comments).value];

        //item.acoustic = [acoustic, acousticValue]; 

        item.features = [features,checkboxes];



    //Save data into local storage: Use Stringify to convert our object to a string

    localStorage.setItem(id,JSON.stringify(item));

    alert(Contact Saved!);

}





//set link & submit click events

var save = $(button);

save.addEventListener(click, storeData);

and here's the relevant html:

<li>Features:

                    <ul>

                        <li><input type=checkbox  name=features value = Cutaway id=cutaway /><label for=cutaway>Cutaway</label></li>

                        <li><input type=checkbox  name=features value = Finished id=finished /><label for=finished>Finished</label></li>

                        <li><input type=checkbox  name=features value = Inlay id=inlay /><label for=inlay>Inlay</label></li>

                        <li><input type=checkbox  name=features value = Wide Neck id=wneck /><label for=wneck>Wide Neck</label></li>

                        <li><input type=checkbox  name=features value = Left-handed id=lhanded /><label for=lhanded>Left-handed</label></li>

                    </ul>

                </li>

Alternatively, here's a link to the full code on github:

https://github.com/b80266/VFW-Project-2/blob/master/additem.html

https://github.com/b80266/VFW-Project-2/blob/master/main.js