Is there anyway to clear the cookie using javascript?
First, I need to clearify the problem. Many posts in StackOverflow give this kind of answer. But it is clearing cookie like setting the value of all the keys to empty string. But I need to erase the keys as well. How can I do that？
PS： I tried document.cookie = null, but it does not work here
The best way I found is to expire the cookie you want to delete, use this javascript:
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);
}
Related
I am using a javascript function to read a cookie and it works in IE but not chrome. Why won't chrome work?
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;
}
Can anyone help me set up a cookie function that can take user input by checking which link the user clicked on and then redirect them to that link and create a cookie for it so the next time the user comes they automatically get redirected.
Can anyone please tell me what am I doing wrong. I want multiple links and clicking on each link should create a cookie and redirect the user.
Can anyone provide a working jsFiddle please.
The code is below please help:
//Html
something site
something2 site
// Javascript
function redirectOne(state)
{
createCookie('state', state, 90);
window.location.href = "www.something1.com" + state;
}
function redirectTwo(state)
{
createCookie('state', state, 90);
window.location.href = "www.something2.com" + state;
}
var cookie = readCookie('state');
if (cookie != null)
{
window.location.href = "www.something.com" + cookie;
}
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);
}
Your problem is that when you call this line in each function
createCookie('state', state, 90);
It's taking the value of '/home' from the onClick event and passing it to the cookie creation routine. You should be passing in something other than '/home' for both functions.
something site
something2 site
// Javascript
function redirectOne(state)
{
createCookie('state', state, 90);
window.location.href = state+'/home';
}
You do not need the redirectTwo function at all.
i want to know how to remember a check box value in a cookie i have method createCookie.
this is the method:
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=/";
}
I think that you should read this article(it is a permalink to the script, but if you have time read it all, it is very good to understand how cookie work).
However this is the code to get a cookie value:
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;
}
I am trying to use a cookie to store a single integer, so when the user refreshes the page I am able to retrieve the previous number they were on (in an attempt to stop doubles of a video appearing).
What would the minimum requirements be to accomplish this?
var randomNumber = Math.floor((Math.random()*10)+1);
document.cookie=(randomNumber);
Setting a cookie:
document.cookie = 'mycookie=' + randomNumber + ";max-age=" + (300) + ";";
Reading a cookie:
var cookie = document.cookie;
alert(decodeURIComponent(cookie));
The cookie contains some other random stuff like push=1 as well as mycookie. Should I be setting the cookie to null before I add the randomNumber?
As far as getting the value of mycookie would I just assign the cookie to a string and parse mycookie from it?
Tamil's comment is solid. Use these quirksmode functions if you ever wish to surpass minimal cookie usage:
cookie_create = function (name,value,days) {
var expires, date;
if (days) {
date = new Date();
date.setTime(date.getTime()+(days*24*60*60*1000));
expires = "; expires="+date.toGMTString();
}
else expires = "";
document.cookie = name+"="+value+expires+"; path=/";
expires = date = null;
};
cookie_read = function (name) {
var nameEQ = name + "=",
ca = document.cookie.split(';'),
len = ca.length,
i, c;
for(i = 0; i < len; ++i) {
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);
}
nameEQ = name = ca = i = c = len = null;
return null;
};
cookie_erase = function (name){
cookie_create(name,"",-1);
name = null;
};
You could use document.cookie to read/write cookies in javascript:
document.cookie = 'mycookie=' + randomNumber + '; path=/';
And if you wanted the cookie to be persistent even after the user closing his browser you could specify an expires date.
been bagging my head over some Javascript, please help, I cant see why it simply wont find my cookie in IE 7 or 8
I am setting the cookie true through another event, but I just want to see IE pick up the cookie which I initially set. Works in firefox too, thanks in advance.
var t=setTimeout("doAlert()",8000);
var doAlertVar = true;
document.cookie = "closed=0;expires=0;path=";
function readCookie(name) {
var nameEQ = name + "=";
var ca = document.cookie;
alert(ca);
ca = ca.replace(/^\s*|\s*$/g,'');
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 doAlert(){
if(readCookie('closed')==1){
doAlertVar = false;
}
if(readCookie('closed')==0){
alert("unlicensed demo version\nbuy online at");
}
t=setTimeout("doAlert()",5000);
}
Where to begin..
setTimeout("doAlert()",8000);
// do not use strings as an argument to setTimeout, that runs eval under the hood.
// use
setTimeout(doAlert,8000);
// instead
document.cookie = "closed=0;expires=0;path=";
// this is wrong, expires should follow the format Fri, 14 May 2010 17:22:33 GMT (new Date().toUTCString())
// path should be path=/
You can also do this with a regex:
function readCookie(name, defaultValue) {
var value = defaultValue;
document.cookie.replace(new RegExp("\\b" + name + "=([^;]*)"), function(_, v) {
value = v;
});
return value;
}