js-custom-datepicker/src/js/lib/class.js

Сalendar was written on javascript using es6 format and was redone to es5 using webpack and babel tools. There are many classes for easy styling for the desired website design.

'use strict';

const oldAdd = (element, className) => {
    let classes = element.className.split(' ');
    if (classes.indexOf(className) < 0) {
        classes.push(className);
    }
    element.className = classes.join(' ');
};

const oldRemove = (element, className) => {
    let classes = element.className.split(' ');
    let idx = classes.indexOf(className);
    if (idx >= 0) {
        classes.splice(idx, 1);
    }
    element.className = classes.join(' ');
};

export const add = (element, className) => {
    
    if (element.classList) {
        element.classList.add(className);
    } else {
        oldAdd(element, className);
    }
};

export const remove = (element, className) => {
    if (element.classList) {
        element.classList.remove(className);
    } else {
        oldRemove(element, className);
    }
};

export const list = (element) => {
    if (element.classList) {
        return Array.prototype.slice.apply(element.classList);
    } else {
        return element.className.split(' ');
    }
};