Cookie: retrieve a future expiration date in proper format
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/tr/xhtml1/DTD/xhtml1-transitional.dtd">
<!--
Example File From "JavaScript and DHTML Cookbook"
Published by O'Reilly & Associates
Copyright 2003 Danny Goodman
-->
<html>
<head>
<title>Recipe 10.04a</title>
<style rel="stylesheet" id="mainStyle" type="text/css">
html {background-color:#cccccc}
body {background-color:#eeeeee; font-family:Tahoma,Arial,Helvetica,sans-serif;
font-size:12px;
margin-left:15%; margin-right:15%; border:3px groove darkred; padding:15px}
h1 {text-align:right; font-size:1.5em; font-weight:bold}
h2 {text-align:left; font-size:1.1em; font-weight:bold; text-decoration:underline}
.buttons {margin-top:10px}
</style>
<script type="text/javascript">
/* cookies.js */
/*
Example File From "JavaScript and DHTML Cookbook"
Published by O'Reilly & Associates
Copyright 2003 Danny Goodman
*/
// utility function to retrieve a future expiration date in proper format;
// pass three integer parameters for the number of days, hours,
// and minutes from now you want the cookie to expire; all three
// parameters required, so use zeros where appropriate
function getExpDate(days, hours, minutes) {
var expDate = new Date();
if (typeof days == "number" && typeof hours == "number" && typeof hours == "number") {
expDate.setDate(expDate.getDate() + parseInt(days));
expDate.setHours(expDate.getHours() + parseInt(hours));
expDate.setMinutes(expDate.getMinutes() + parseInt(minutes));
return expDate.toGMTString();
}
}
// utility function called by getCookie()
function getCookieVal(offset) {
var endstr = document.cookie.indexOf (";", offset);
if (endstr == -1) {
endstr = document.cookie.length;
}
return unescape(document.cookie.substring(offset, endstr));
}
// primary function to retrieve cookie by name
function getCookie(name) {
var arg = name + "=";
var alen = arg.length;
var clen = document.cookie.length;
var i = 0;
while (i < clen) {
var j = i + alen;
if (document.cookie.substring(i, j) == arg) {
return getCookieVal(j);
}
i = document.cookie.indexOf(" ", i) + 1;
if (i == 0) break;
}
return null;
}
// store cookie value with optional details as needed
function setCookie(name, value, expires, path, domain, secure) {
document.cookie = name + "=" + escape (value) +
((expires) ? "; expires=" + expires : "") +
((path) ? "; path=" + path : "") +
((domain) ? "; domain=" + domain : "") +
((secure) ? "; secure" : "");
}
// remove the cookie by setting ancient expiration date
function deleteCookie(name,path,domain) {
if (getCookie(name)) {
document.cookie = name + "=" +
((path) ? "; path=" + path : "") +
((domain) ? "; domain=" + domain : "") +
"; expires=Thu, 01-Jan-70 00:00:01 GMT";
}
}
</script>
<script language="JavaScript" type="text/javascript">
function saveValues() {
setCookie("name1", document.forms[0].name1.value);
setCookie("name2", document.forms[0].name2.value);
setCookie("color", document.forms[0].color.options[document.forms[0].color.selectedIndex].value);
}
function applyValues() {
var form = document.forms[0];
form.name1.value = (getCookie("name1")) ? getCookie("name1") : "";
form.name2.value = (getCookie("name2")) ? getCookie("name2") : "";
var selValue = (getCookie("color")) ? getCookie("color") : "";
if (selValue) {
for (var i = 0; i < form.color.options.length; i++) {
if (form.color.options[i].value == selValue) {
form.color.selectedIndex = i;
break;
}
}
}
}
</script>
</head>
<body onunload="saveValues()" onload="applyValues()">
<form>
<h1>Page One</h1>
<hr>
First Name: <input type="text" name="name1" id="name1"><br>
Last Name: <input type="text" name="name2" id="name2"><br>
Your favorite color: <select id="color" name="color">
<option value="">Pick a color:</option>
<option value="Red">Red</option>
<option value="Green">Green</option>
<option value="Blue">Blue</option>
</select>
</form>
</body>
</html>
Related examples in the same category
