appwrite/public/scripts/views/forms/color.js

(function (window) {
    "use strict";

    window.ls.container.get('view').add(
        {
            selector: 'data-forms-color',
            controller: function(element) {
                var preview = document.createElement('div');
                var picker = document.createElement('input');

                picker.type = 'color';
                preview.className = 'color-preview';

                preview.appendChild(picker);

                picker.addEventListener('change', syncA);
                picker.addEventListener('input', syncA);
                element.addEventListener('input', update);
                element.addEventListener('change', update);

                function update() {
                    if(element.validity.valid) {
                        preview.style.background = element.value;
                        syncB();
                    }
                }

                function syncA() {
                    element.value = picker.value;
                    update();
                }

                function syncB() {
                    picker.value = element.value;
                }

                element.parentNode.insertBefore(preview, element);

                update();
                syncB();
            }
        }
    );

})(window);