serialize <input>

serialize.js

function serialize(form){
    if (!form || form.nodeName !== "FORM") return;
    var el, op, obj = {}, name, type, value, node;
    for (el of form.elements) {
        name=el.name;
        if (name === "") continue;
        type=el.type;
        value=el.value;
        node=el.nodeName;
        if(/INPUT/.exec(node) && (/text|hidden|password|button|reset|submit/.exec(type) || /checkbox|radio/.exec(type)&&el.checked) || 
        /TEXTAREA/.exec(node) || 
        /SELECT/.exec(node) && /select-one/.exec(node) || 
        /BUTTON/.exec(node) && /reset|submit|button/.exec(type)){
            obj[name] = encodeURIComponent(value);
        }else if(/SELECT/.exec(node) && /select-multiple/.exec(node)){
            for (op of el.options) {
                if (op.selected) {
                    obj[name] = encodeURIComponent(op.value);
                }
            }
        }
    }
    return obj;
}