Vulcan/packages/vulcan-forms/lib/components/FormNestedArray.jsx

import React, { PureComponent } from 'react';
import PropTypes from 'prop-types';
import { Components, registerComponent } from 'meteor/vulcan:core';
import "./FormNestedItem"

class FormNestedArray extends PureComponent {
  getCurrentValue() {
    return this.props.value || []
  }

  addItem = () => {
    const value = this.getCurrentValue()
    this.props.updateCurrentValues({ [`${this.props.path}.${value.length}`]: {} }, { mode: 'merge'});
  };

  removeItem = index => {
    this.props.updateCurrentValues({ [`${this.props.path}.${index}`]: null });
  };

  /*

  Go through this.context.deletedValues and see if any value matches both the current field
  and the given index (ex: if we want to know if the second address is deleted, we
  look for the presence of 'addresses.1')
  */
  isDeleted = index => {
    return this.props.deletedValues.includes(`${this.props.path}.${index}`);
  };

  render() {
    const value = this.getCurrentValue()
    // do not pass FormNested's own value, input and inputProperties props down
    const properties = _.omit(this.props, 'value', 'input', 'inputProperties', 'nestedInput');
    const { errors, path } = this.props;
    // only keep errors specific to the nested array (and not its subfields)
    const nestedArrayErrors = errors.filter(error => error.path && error.path === path);
    const hasErrors = nestedArrayErrors && nestedArrayErrors.length;

    return (
      <div className={`form-group row form-nested ${hasErrors ? 'input-error': ''}`}>
        <label className="control-label col-sm-3">{this.props.label}</label>
        <div className="col-sm-9">
          {value.map(
            (subDocument, i) =>
              !this.isDeleted(i) && (
                <Components.FormNestedItem
                  {...properties}
                  key={i}
                  itemIndex={i}
                  path={`${this.props.path}.${i}`}
                  removeItem={() => {
                    this.removeItem(i);
                  }}
                />
              )
          )}
          <Components.Button size="small" variant="success" onClick={this.addItem} className="form-nested-button">
            <Components.IconAdd height={12} width={12} />
          </Components.Button>
          {hasErrors ? <Components.FieldErrors errors={nestedArrayErrors} /> : null}
        </div>
      </div>
    );
  }
}

FormNestedArray.propTypes = {
  currentValues: PropTypes.object,
  path: PropTypes.string,
  label: PropTypes.string
};

module.exports = FormNestedArray

registerComponent('FormNestedArray', FormNestedArray);

const IconAdd = ({ width = 24, height = 24 }) => (
  <svg width={width} height={height} xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512">
    <path d="M448 294.2v-76.4c0-13.3-10.7-24-24-24H286.2V56c0-13.3-10.7-24-24-24h-76.4c-13.3 0-24 10.7-24 24v137.8H24c-13.3 0-24 10.7-24 24v76.4c0 13.3 10.7 24 24 24h137.8V456c0 13.3 10.7 24 24 24h76.4c13.3 0 24-10.7 24-24V318.2H424c13.3 0 24-10.7 24-24z" />
  </svg>
);

registerComponent('IconAdd', IconAdd);

const IconRemove = ({ width = 24, height = 24 }) => (
  <svg width={width} height={height} xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512">
    <path d="M424 318.2c13.3 0 24-10.7 24-24v-76.4c0-13.3-10.7-24-24-24H24c-13.3 0-24 10.7-24 24v76.4c0 13.3 10.7 24 24 24h400z" />
  </svg>
);

registerComponent('IconRemove', IconRemove);