JSFiddle - React, Tailwind, and code Playground

HTML

<form name="form1">
    <input name="place[]" type="checkbox" value="a" />a
    <input name="place[]" type="checkbox" value="b" />b
    <input name="place[]" type="checkbox" value="c" />c
    <button>click me </button>
</form>

JavaScript

function generateURL() {
    var places = document.form1['place[]'];

    var checked_places = [];
    for (var i = 0, l = places.length; i < l; i++) {
        if (places[i].checked) {
            checked_places.push('place[]=' + places[i].value);
        }
    }
    alert("go.php?" + checked_places.join('&'));
    return false;
}

$('button').click(generateURL);