1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58
| <!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>opacity input</title>
<script>
function createCookie(name,value,days) {
if (days) {
var date = new Date();
date.setTime(date.getTime()+(days*24*60*60*1000));
var expires = "; expires="+date.toGMTString();
}
else var expires = "";
document.cookie = name+"="+value+expires+"; path=/";
}
function readCookie(name) {
var nameEQ = name + "=";
var ca = document.cookie.split(';');
for(var i=0;i < ca.length;i++) {
var c = ca[i];
while (c.charAt(0)==' ') c = c.substring(1,c.length);
if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
}
return null;
}
function eraseCookie(name) {
createCookie(name,"",-1);
}
function valuecookie() {
var x = readCookie('luminosite');
return x;
}
</script>
</head>
<body>
Opacité: <input type="range" id="ascenseur" value="valuecookie();" min="0" max="100" onclick="ma_fonction();"/>
<br>
<br>
<img id="tonimage" src="http://joconde.vinci.free.fr/joconde.jpg"></img>
<script>
document.getElementById("ascenseur").addEventListener("change", function(){
document.getElementById("tonimage").style.opacity = this.value/100;
});
function ma_fonction(){
eraseCookie('luminosite');
var ma_variable=document.getElementById('ascenseur').value;
createCookie('luminosite',ma_variable,360);
}
</script>
</body>
</html> |