virtex-dom/lib/updateNode.js

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _removeAttribute = require('./removeAttribute');

var _removeAttribute2 = _interopRequireDefault(_removeAttribute);

var _setAttribute = require('./setAttribute');

var _setAttribute2 = _interopRequireDefault(_setAttribute);

var _isUndefined = require('@f/is-undefined');

var _isUndefined2 = _interopRequireDefault(_isUndefined);

var _foreach = require('@f/foreach');

var _foreach2 = _interopRequireDefault(_foreach);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/**
 * Update element
 */

/**
 * Imports
 */

function updateElement(prev, next) {
  var node = next.element = prev.element;

  /**
   * Diff attributes
   */

  var pattrs = prev.props;
  var nattrs = next.props;

  (0, _foreach2.default)(function (val, key) {
    if (!nattrs || (0, _isUndefined2.default)(nattrs[key])) {
      (0, _removeAttribute2.default)(node, key);
    }
  }, pattrs);

  (0, _foreach2.default)(function (val, key) {
    var pval = pattrs[key];
    if (!pattrs || val !== pval) {
      (0, _setAttribute2.default)(node, key, val, pval);
    }
  }, nattrs);

  return next;
}

/**
 * Exports
 */

exports.default = updateElement;