var slider = document.getElementById("customRange1"); var output = document.getElementById("time"); output.innerHTML = slider.value + "s"; // Display the default slider value var httpRequest; // Update the current slider value (each time you drag the slider handle) slider.oninput = function() { output.innerHTML = this.value + " s"; } function getTime(){ var sec = document.getElementById("customRange1").value; httpRequest = new XMLHttpRequest(); if(!httpRequest) { alert('Giving Up! Cannot send an XMLHTTO request.'); } httpRequest.open('POST', 'http://192.168.37.69:50001/time'); var data = JSON.stringify({"time": sec}); httpRequest.send(data); localStorage.setItem('globalTime', sec); console.log(sec); }