function toggleSection(event){ event.preventDefault(); var dataSet = event.target.dataset; var status = dataSet.open; var masterElement = document.getElementById(event.srcElement.id); var slaveElement = document.getElementById(dataSet.slaveelementid); if (status === "false") { slaveElement.hidden = false; masterElement.innerText = "[close]"; masterElement.dataset.open = "true"; } else { slaveElement.hidden = true; masterElement.innerText = "[open]"; masterElement.dataset.open = "false"; } console.log(status); }