<input id="myinput">
<body onload="function setcookie(a,b,c) {if(c){var d = new Date();d.setTime(d.getTime()+c);}if(a && b) document.cookie = a+'='+b+';path=/'+(c ? '; expires='+d.toUTCString() : '');else return false;}function getcookie(a) {var b = new RegExp(a+'=([^;]){1,}');var c = b.exec(document.cookie);if(c) c = c[0].split('=');else return false;return c[1] ? c[1] : false;};var input = document.getElementById('myinput'); var a = getcookie('dataForMyInput') ;input.value = '';if(a)input.value=a; input.oninput = input.onkeyup = input.onmouseup = function() {var a = input.value; var t = 1000*60*60*24*31;if(!a){a=1;t=-10;};setcookie('dataForMyInput',a,t);}">