Edit in JSFiddle

$(function() {
  var spread = new GC.Spread.Sheets.Workbook(document.getElementById("ss"));
  var sheet = spread.getActiveSheet();
  var namebox = document.getElementById("namebox");
  namebox.value = "A1";

  namebox.onkeyup = function() {
    var val = namebox.value;
    var spCalc = GC.Spread.Sheets.CalcEngine;
    var isRef = spCalc.evaluateFormula(sheet, "ISREF(" + val + ")", 0, 0, false);
    if (isRef) {
      var row = spCalc.evaluateFormula(sheet, "ROW(" + val + ")", 0, 0, false);
      var col = spCalc.evaluateFormula(sheet, "COLUMN(" + val + ")", 0, 0, false);
      //アクティブセルを設定
      sheet.setActiveCell(row - 1, col - 1);
    }
  };
});

<!-- 名前ボックス -->
A1形式のセル参照を入力してください：
<input id="namebox" type="text" />
<!-- SpreadJS マークアップ -->
<div id="ss"></div>