<HTML><HEAD>
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<SCRIPT LANGUAGE="JavaScript"><!-- hide from old browsers
/*
THE JAVASCRIPT COOKBOOK by Erica Sadun, webrx@mindspring.com
Copyright (c)1998 by Charles River Media. All Rights Reserved.
This applet can only be re-used or modifed by license holders of the
JavaScript Cookbook CD-ROM. Credit must be given in the source
code and this copyright notice must be maintained. If you do
not hold a license to the JavaScript Cookbook, you may NOT
duplicate or modify this code for your own use.
Use at your own risk. No warranty is given or implied of the suitability
of this applet for any specific application. Neither Erica Sadun nor
Charles River Media will be held responsible for any unwanted effects
due to the use of this applet or any derivative.
*/
// --------------------COOKIE STRING UTILITIES---------------------
// Substitute character string c2 for every c1 in aString
function subst(aString, c1, c2)
{
if (aString == "") return aString
if (c1 == "") return aString
// avoid infinite recursion when substituting aa for a by
// providing an offset into the string.
var argc = subst.arguments.length
if (argc < 4) {n = 0} else {n = subst.arguments[3]}
// find the first occurence of c1 after the threshold
var i = aString.indexOf(c1, n)
// stop recursion and return the current string when c1 not found
if (i < 0) return aString
// extract substrings s1 and s2 around the c1
var s1 = aString.substring(0, i)
var s2 = aString.substring(i+c1.length, aString.length)
// recurse with this new string
return subst(s1+c2+s2, c1, c2, (i+c2.length))
}
// Strips a string of blanks on either end
function stripBlanks(aString)
{
var tmp = ""+aString
var bottom = 0
var top = tmp.length
if (tmp == "") return tmp
while (tmp.substring(bottom, bottom + 1) == " ") bottom++
if (bottom >= top) return("")
while (tmp.substring(top - 1, top) == " ") top -= 1
return (tmp.substring(bottom, top))
}
// Count Occurances of a Substring
function count(aString, aSubstring)
{
// initialize counter and offset
var count = 0
var offset = 0
var where = 0
var tmp = ""+aString
// search until no more found
while ((offset < tmp.length) &&
((where = tmp.indexOf(aSubstring, offset)) >= 0))
{
count++
offset = where+aSubstring.length
}
// return it
return count
}
// Encookie -- code spaces, semicolons and commas
function encookie(aString)
{
var tmp = ""+aString
tmp = subst(tmp, " ", "%20")
tmp = subst(tmp, ",", "%2C")
tmp = subst(tmp, ";", "%3B")
tmp = subst(tmp, "=", "%3D")
return tmp
}
// Decookie -- decode spaces, semicolons and commas
function decookie(aString)
{
var tmp = ""+aString
tmp = subst(tmp, "%20", " ")
tmp = subst(tmp, "%2C", ",")
tmp = subst(tmp, "%3B", ";")
tmp = subst(tmp, "%3D", "=")
return tmp
}
// Search for a substring and chop before it
function chopit(aString, aSubstring)
{
var tmp = ""+aString
if (tmp.length == 0) return tmp
if (aSubstring.length == 0) return tmp
var where
if ((where = tmp.indexOf(aSubstring)) < 0) return tmp
return (tmp.substring(0, where))
}
// Search for a substring and lop off everything after it
function lopit(aString, aSubstring)
{
var tmp = ""+aString
if (tmp.length == 0) return tmp
if (aSubstring.length == 0) return tmp
var where
if ((where = tmp.indexOf(aSubstring)) < 0) return tmp
return (tmp.substring(where+aSubstring.length, tmp.length))
}
//------------------STRING-ARRAY UTILITIES-------------------
// Find the substring at index n, counting 0 to n
function doIndex(aString, n)
{
var str=""+aString
// Count until the correct index
for(var i = 0; i < n; i++)
{
var where = str.indexOf(':', 1)
str = str.substring(where+1, str.length)
}
// Lop off the end of the string
return str.substring(0, str.indexOf(':'))
}
//------------------CUSTOM GMT UTILITY-----------------------------
// Return the 3-letter symbol for month #n
function month(n)
{
var m = "Jan:Feb:Mar:Apr:May:Jun:Jul:Aug:Sep:Oct:Nov:Dec:"
return doIndex(m, n)
}
// Return the 3-letter symbol for day #n
function day(n)
{
var d = "Sun:Mon:Tue:Wed:Thu:Fri:Sat:"
return doIndex(d, n)
}
// A Custom "GMT" Function
function myGMT(d)
{
tmp = day(d.getDay())+', '+d.getDate()+' '+month(d.getMonth())
tmp += ' 19'+d.getYear()+' '
if (d.getHours() < 10) tmp += '0'
tmp += d.getHours()+':'
if (d.getMinutes()< 10) tmp += '0'
tmp += d.getMinutes()+':'
if (d.getSeconds() < 10) tmp += '0'
tmp += d.getSeconds()+" GMT"
return tmp
}
// An Alternate "GMT" Function: NOTE! This--changed for hyphens and no (19)
function altGMT(d)
{
tmp = day(d.getDay())+', '+d.getDate()+'-'+month(d.getMonth())
tmp += '-'+d.getYear()+' '
if (d.getHours() < 10) tmp += '0'
tmp += d.getHours()+':'
if (d.getMinutes()< 10) tmp += '0'
tmp += d.getMinutes()+':'
if (d.getSeconds() < 10) tmp += '0'
tmp += d.getSeconds()
return tmp
}
// --------------------COOKIE DATA UTILITIES---------------------
// Cookie Flattener
function flatten()
{
var tmp = ""+this.name+"="+this.value
tmp += (this.expires == null) ? "" : "; expires="+this.expires
tmp += (this.path == null) ? "" : "; path="+this.path
tmp += (this.domain == null) ? "" : "; domain="+this.domain
tmp += (this.isSecure) ? "; secure" : ""
return tmp
}
// Store Cookie in the jar
function store() {document.cookie = this.flatten()}
// Set Name
function setName(aName){this.name = encookie(aName)}
// Set Value
function setValue(aValue){this.value = encookie(aValue)}
// Get Name
function getName(aName){this.name = decookie(aName)}
// Get Value
function getValue(aValue){this.value = decookie(aValue)}
// Check for WIN16 -- avoid the date bug
function isWin16()
{
return (navigator.userAgent.toUpperCase().indexOf('WIN16') != -1)
}
// Expiration Times
function setExpires(howLong)
{
var now = new Date()
var epoch = isWin16() ? 0 : new Date(0)
var msecs = now.getTime()
var offset = now.getTimezoneOffset() * 60000
var t = 0
howLong = howLong.toLowerCase()
// determine how long until expiration
if (howLong == 'now') t = msecs - (3600000 * 24 * 365) // overkill
if (howLong == 'hour') t = msecs + (3600000) // 60 minutes
if (howLong == 'day') t = msecs + (3600000 * 24) // 24 hours
if (howLong == 'week') t = msecs + (3600000 * 24 * 7) // 7 days
if (howLong == 'month') t = msecs + (3600000 * 24 * 30) // 30 days
if (howLong == 'year') t = msecs + (3600000 * 24 * 365) // 365 days
// set the expiration
exp = isWin16() ? (t - offset) : ((t - epoch.getTime()) - offset)
now.setTime(exp)
this.expires = myGMT(now)
return this
}
// Turn on security
function secure(){this.isSecure = true}
// Turn off security
function unsecure(){this.isSecure = false}
// get rid of a cookie right now
function crumble()
{
this.setExpires('now')
this.store()
}
// revive a crumbled cookie
function uncrumble()
{
this.expires = null
this.store()
}
// Cookie Constructor
function JSCCookie(cname, cvalue)
{
// Create and initialize cookie slots
this.name = encookie(cname) // readable and writeable
this.value = encookie(cvalue) // readable and writeable
this.expires = null // writeable
this.isSecure = false // writeable
this.path = null // writeable
this.domain = null // writeable
// Set cookie methods
this.setExpires = setExpires
this.crumble = crumble
this.uncrumble = uncrumble
this.flatten = flatten
this.store = store
this.secure = secure
this.unsecure = unsecure
this.setName = setName
this.getName = getName
this.setValue = setValue
this.getValue = getValue
}
// --------------------COOKIE JAR UTILITIES---------------------
// find a cookie by partial string
function findCookie(name)
{
num_in_jar = Math.min(document.cookie.length,
count(document.cookie, ';')+1)
if (num_in_jar != 0)
{
var tmp = ""+document.cookie
for (var i = 0; i < num_in_jar; i++)
{
var crumb = stripBlanks(chopit(tmp, ";"))
tmp = lopit(tmp, ";")
var cname = decookie(chopit(crumb, "="))
if (cname.indexOf(name) >= 0) return crumb
}
}
return null
}
// Fetch a value (by partial string)
function fetch(name)
{
var crumb = findCookie(name)
if (crumb == null) return null
var cname = decookie(chopit(crumb, "="))
var cvalue = decookie(lopit(crumb, "="))
if (cname.indexOf(name) >= 0) return cvalue
return null
}
// Fetch a name (by partial string)
function fetchName(name)
{
var crumb = findCookie(name)
if (crumb == null) return null
var cname = decookie(chopit(crumb, "="))
var cvalue = decookie(lopit(crumb, "="))
if (cname.indexOf(name) >= 0) return cname
return null
}
// Fetch a particular cookie (by partial string)
function fetchCookie(name)
{
var crumb = findCookie(name)
if (crumb == null) return null
var cname = decookie(chopit(crumb, "="))
var cvalue = decookie(lopit(crumb, "="))
if (cname.indexOf(name) >= 0)
{
var c = new JSCCookie(cname, cvalue)
return c
}
return null
}
// --------------------COOKIE INFO UTILITIES---------------------
// Cookie Information
function cookiePeek()
{
size_in_jar = document.cookie.length
num_in_jar = Math.min(document.cookie.length,
count(document.cookie, ';')+1)
if (num_in_jar != 0)
{
document.write("<b>Current Cookies:</b> "+
document.cookie+"<p><blockquote>")
var tmp = ""+document.cookie
var crumb, cname, cvalue
for (var i = 0; i < num_in_jar; i++)
{
crumb = chopit(tmp, ";")
tmp = lopit(tmp, ";")
cname = decookie(chopit(crumb, "="))
cvalue = decookie(lopit(crumb, "="))
document.write("<b>Name:</b> <FONT COLOR='770000'>"+cname+"</FONT> ")
document.write("<b>Value:</b> <FONT COLOR='770000'>"+cvalue+"<br></FONT>")
}
document.write("</blockquote>")
}
else
document.write("<b>The Cookie Jar is <FONT COLOR='770000'>Empty</FONT>.</b><br>")
document.write('There are a total of '+num_in_jar+' cookies taking up '+
size_in_jar+' bytes<p>')
}
// --------------------Auxilliary Functions---------------------
// get cookie
function getit(n)
{
var td = fetch('ToDo'+n)
if (td == null) td = ''
return td
}
// Read in the Cookie List
function readCookieList()
{
document.forms[0].ToDo0.value = getit(0)
document.forms[0].ToDo1.value = getit(1)
document.forms[0].ToDo2.value = getit(2)
document.forms[0].ToDo3.value = getit(3)
document.forms[0].ToDo4.value = getit(4)
document.forms[0].ToDo5.value = getit(5)
document.forms[0].ToDo6.value = getit(6)
document.forms[0].ToDo7.value = getit(7)
}
// put cookie
function putit(i, v)
{
var myCookie = new JSCCookie('ToDo'+i, '.')
if (v == '') myCookie.crumble()
else
{
myCookie.setValue(v)
myCookie.path = '/' // netscape error. store between sessions
myCookie.setExpires('year')
myCookie.store()
}
}
function writeCookieList()
{
putit(0, document.forms[0].ToDo0.value)
putit(1, document.forms[0].ToDo1.value)
putit(2, document.forms[0].ToDo2.value)
putit(3, document.forms[0].ToDo3.value)
putit(4, document.forms[0].ToDo4.value)
putit(5, document.forms[0].ToDo5.value)
putit(6, document.forms[0].ToDo6.value)
putit(7, document.forms[0].ToDo7.value)
alert('Document cookies have been stored.')
}
<!-- done hiding --></SCRIPT></HEAD>
<BODY BGCOLOR="FFFFFF"
onLoad='setTimeout("readCookieList()",250)'>
<FONT COLOR="007777"><H1><IMG SRC="../GRAFX/UTENS.JPG" WIDTH=80 HEIGHT=50
ALIGN = LEFT>Things To Do List</H1></FONT>
<BLOCKQUOTE><FONT COLOR="770000">This list uses cookies to remember
your important "to-do" items.
</BLOCKQUOTE></FONT>
<FORM>
1: <INPUT TYPE='TEXT' NAME='ToDo0' Size='40' VALUE=''><br>
2: <INPUT TYPE='TEXT' NAME='ToDo1' Size='40' VALUE=''><br>
3: <INPUT TYPE='TEXT' NAME='ToDo2' Size='40' VALUE=''><br>
4: <INPUT TYPE='TEXT' NAME='ToDo3' Size='40' VALUE=''><br>
5: <INPUT TYPE='TEXT' NAME='ToDo4' Size='40' VALUE=''><br>
6: <INPUT TYPE='TEXT' NAME='ToDo5' Size='40' VALUE=''><br>
7: <INPUT TYPE='TEXT' NAME='ToDo6' Size='40' VALUE=''><br>
8: <INPUT TYPE='TEXT' NAME='ToDo7' Size='40' VALUE=''><p>
<INPUT TYPE='BUTTON'
Value=' Store List ' onClick='writeCookieList()'>
</FORM>
<h5>Copyright ©1996 by Charles River Media, All Rights Reserved</h5>
</BODY></HTML>