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// global var that holds: 0- if ctrl key is not pressed 1- if ctrl key is pressed
var ctrlKeyHistory = 0;

/**
  * Allows moving around inputs/select by Ctrl+arrows
  *
  * @param {object} event data
  */
function onKeyDownArrowsHandler(event) {
  var e = event || window.event;
  var o = e.srcElement || e.target;
  if (!o) {
    return;
  }
  if (o.tagName !== 'TEXTAREA' && o.tagName !== 'INPUT' && o.tagName !== 'SELECT') {
    return;
  }
  if (e.which !== 17 && e.which !== 37 && e.which !== 38 && e.which !== 39 && e.which !== 40) {
    return;
  }
  if (!o.id) {
    return;
  }
  if (e.type === 'keyup') {
    if (e.which === 17) {
      ctrlKeyHistory = 0;
    }
    return;
  } else if (e.type === 'keydown') {
    if (e.which === 17) {
      ctrlKeyHistory = 1;
    }
  }
  if (ctrlKeyHistory !== 1) {
    return;
  }
  e.preventDefault();
  var pos = o.id.split('_');
  if (pos[0] !== 'field' || typeof pos[2] === 'undefined') {
    return;
  }
  var x = pos[2];
  var y = pos[1];
  switch (e.keyCode) {
    case 38:
      // up
      y--;
      break;
    case 40:
      // down
      y++;
      break;
    case 37:
      // left
      x--;
      break;
    case 39:
      // right
      x++;
      break;
    default:
      return;
  }
  var id = 'field_' + y + '_' + x;
  var nO = document.getElementById(id);
  if (!nO) {
    id = 'field_' + y + '_' + x + '_0';
    nO = document.getElementById(id);
  }

  // skip non existent fields
  if (!nO) {
    return;
  }
  nO.focus();
  if (nO.tagName !== 'SELECT') {
    nO.select();
  }
  e.returnValue = false;
}
AJAX.registerTeardown('keyhandler.js', function () {
  $(document).off('keydown keyup', '#table_columns');
  $(document).off('keydown keyup', 'table.insertRowTable');
});
AJAX.registerOnload('keyhandler.js', function () {
  $(document).on('keydown keyup', '#table_columns', function (event) {
    onKeyDownArrowsHandler(event.originalEvent);
  });
  $(document).on('keydown keyup', 'table.insertRowTable', function (event) {
    onKeyDownArrowsHandler(event.originalEvent);
  });
});

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