form-stamp/form-stamp.js

/* jshint esversion: 6 */
const defaults = {
    nameToReplace: 'idx',
    removeSelector: '.remove',
    minimalId: 'auto'
}

export function formStamp(element, options = {})
{
    const {
        nameToReplace,
        removeSelector,
        minimalId
    } = { ...defaults, ...element.dataset, ...options };
    const container = element.parentElement;
    const template = element.querySelector('template');
    const itemSelector = '.' + template.content.firstElementChild.className.replace(/ /g, '.');
    const startWithId = minimalId === 'auto' ? container.querySelectorAll(itemSelector).length : parseInt(minimalId);
    let created = 0;
    const afterDomManipulation = () => {
        element.dispatchEvent(new CustomEvent('afterStampDomManipulation'));
    }
    const removeRow = (removeItem) => () => {
        const rowToDelete = removeItem.closest(itemSelector);
        // Flow renders identity fields directly at the form tag, so we need to look
        if (rowToDelete.dataset.stampRemoveWithMe) {
            container.closest('form')
                .querySelectorAll(rowToDelete.dataset.stampRemoveWithMe)
                .forEach(child => child.remove())
        }
        if (element.dispatchEvent(new CustomEvent(
            'beforeStampRemoval',
            {
                cancelable: true,
                detail: {
                    toBeRemoved: rowToDelete
                }
            }
        ))) {
            rowToDelete.remove();
            afterDomManipulation();
        }
    }

    element.addEventListener('click', () => {
        const clone = template.content.cloneNode(true);
        clone.querySelectorAll('input, select, textarea').forEach(child => {
            child.name = child.name.replace(nameToReplace, startWithId + created);
        });
        clone.querySelectorAll(removeSelector).forEach(child => {
            child.onclick = removeRow(child);
        });
        if (element.dispatchEvent(new CustomEvent(
            'beforeStampInsert',
            {
                detail: {
                    i: startWithId + created,
                    node: clone
                },
                cancelable: true
            }
        ))) {
            element.before(clone);
            afterDomManipulation();
            created++;
        }
    });
    container.querySelectorAll(removeSelector).forEach(child => {
        child.onclick = removeRow(child);
    });
}
export default formStamp;