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HTML cookie don't create

I'm having problem of creating a cookie, I have this code:
window.onload = function() {
var value = readCookie('username');
if(value == null){
alert("null");
document.cookie = "username=Bob; expires=Thu, 18 Dec 2016 12:00:00 UTC";
}
else
alert(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;
}
When the page load I check if the cookie exists, if it doesn't, I pop up an alert saying that is null, then I create the cookie, but every time I load the page it always says its null. Now the problem is in the creation of the cookie or in the readCookie function. I can't find why this doesn't work.
UPDATE
So in google Chrome it won't work, but in internet explorer works perfectly, someone knows why? I would like to work in all browsers.

When I create an HTML page using that code and run it in a normal test environment, the problem you describe does not occur. It alerts null on the first load and Bob on the second load.
If, however, I tell the browser to load the page from file:///Users/david/tmp/jgfklgjkl/index.html instead of my test server at http://localhost:7007/, then it always alerts null.
Cookies are associated with a hostname, and you have to load the page over HTTP in order to use them.
You are presumably loading them from a local file, and that is where the problem lies, not with your code.

Try this function for reading cookie. I've been using it for quite too long and it's working fine so far
function getCookieValue(cookie_name) {
var cookie, cookies = document.cookie.split(';');
for (var i = cookies.length - 1; i >= 0; --i) {
cookie = cookies[i].split('=');
if (cookie[0].trim() === cookie_name)
return cookie[1];
}
return "";
}
Also if you are interested you could use this function for adding cookies for 10 years.
function addCookie(name, value) {
var expire = new Date();
expire.setFullYear(expire.getFullYear() + 10);
d.cookie = name + "=" + value + "; expires=" + expire.toGMTString() + "; path=/";
}

Can you explain to me about this line of code for Javascript cookie tutorial?

I'm just beginning to learn javascript and while I was going through the cookie tutorial, there is a part which I don't understand at all. Can you guys please explain it to me in detail? Thanks in advance!
Below's the whole script but the only part which puzzles me is the readCookie(name) function. The first line var nameEQ = name + "="; I don't understand why we have to put an equal sign to the end of the string.
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);
}

At first glance:
In this line: if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
it is looking for "name=" and if it finds it removes it from the string. It appends the = to ensure it strips the whole section from string c.
Example: say c = name=SomeCookieName, after that line of code you will be left with SomeCookieName

There are more details here (MDN), but briefly...
At minimum, a cookie is a string that consists of the name of the cookie (the part before the equal sign) and the value of the cookie (the part after the equal sign). So, the equal sign is just the divider between name and value. This way the cookie can be stored as a string but contain multiple parts.
Since that function is searching through all cookies, you need the name plus the equal sign to find the correct value. Without the equal sign, you may get the wrong cookie that has the name you are looking for in its value.

Conditional Cached Page Redirect

I am trying to set up a conditional cached re-direct depending on the website viewers choice.
Here's an example of how I am looking to have the website function ( you can test this by going to vonage.com):
When I visit www.vonage.com, I have a choice between "For Personal, For Small Business, For Mid-Market & Enterprise".
After making the choice, you'll be sent to the associated website/subdomain - either vonage.com, personal.vonage.com, or enterprise.vonage.com.
Then, if you try to go back to the initial page with choices, you won't be able to, you're redirected back to the choice that you've already made.
How is this done? I would like to implement something similar. I'm using Wordpress by the way, but that probably won't matter, I can get my hands dirty in the code or .htaccess.

There may be a better way, and this is java-script only not php, but a cookie should do the trick.
on page load check if the cookie exists, if it does redirect, if not don't:
if (document.cookie.indexOf("home") >= 0) {
// redirect them to home
}
else if (document.cookie.indexOf("business") >= 0) {
// redirect them to business
}
else if (document.cookie.indexOf("enterprise") >= 0) {
// redirect them to enterprise
}
if none of those trigger, and the user is not redirected when they choose an option set their cookie, for example:
// set a new cookie
expiry = new Date();
expiry.setTime(date.getTime()+(10*60*1000)); // Ten minutes
// Date()'s toGMTSting() method will format the date correctly for a cookie
document.cookie = "business; expires=" + expiry.toGMTString();

(function(href, referrer) {
var enterprise = "http://enterprise.mysite.com"
var personal = "http://personal.mysite.com"
var is_enterprise = new RegExp(enterprise).test(href)
var is_personal = new RegExp(personal).test(href)
var cache = readCookie('portal')
if (cache) return location.href = cache
var portal = is_enterprise || is_personal
if (portal) document.cookie = "portal=" + (enterprise || personal) + "; expires=Fri, 31 Dec 9999 23:59:59 GMT";
return null
})(location.href, document.referrer)
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;
}

read cookie in javascript , made by asp.net c#code

I've made a cookie using asp.net C# code and I want to retrieve its value in javascript
Here's my C# code:
HttpCookie cookie = new HttpCookie("doc1count");
cookie.Value = "hellonitesh";
I am using this code:
var cookie = '#HttpContext.Current.Request.Cookies["doc1count"].Value';
alert(cookie);
but its giving me garbage value.

Try to separate client and server side
Add cookies to responce on server:
HttpCookie myCookie= new HttpCookie("doc1count");
myCookie.Value = "hellonitesh";
HttpContext.Response.Cookies.Add(myCookie);
And retrieve it in javascript (You can find more examples
here)
function getCookie(cname) {
var name = cname + "=";
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);
if (c.indexOf(name) == 0) return c.substring(name.length,c.length);
}
return "";
}
var myCookie = getCookie("doc1count")

Try to use jquery.cookie plugin to manage cookie at client end. Apart from this, I can see in your C# code you are not posting the cookie variable. So you should do like following -
HttpContext.Current.Response.Cookies.Add(new HttpCookie("cookie_name","cookie_value"));

You can probably just access it through ASP.NET variable by adding in the inline code I have right here. That's if you wanna be fairly simple about it, you can check if it contains anything with an if statement before assigning it I believe.
var cookie = '<%= Request.Cookies["cookieID"].ToString() %>';
alert(cookie);

Try this
var cookie = '#Request.Cookies["culture"].Value';

Check returning visitors using cookies

I have a blog that requires users to signup via email in order to view the full post. I want to skip this requirement if a user has already signed up.
Here's how it works.
User visits page, if cookie is presen then show content
If cookie is not present, user must signup
User signs up, cookie created.
The problem with my code is that it's post specific. e.g. Let's say we have Post A & Post B. If user opts in Post A, they will need to opt in again on Post B which is not good.
If they opt in on Post A, I want to recognize the cookie on Post B as well.
How can I adjust my code?
if (document.cookie.indexOf("entered_email")>=0) {
jQuery('.hidden-blog').slideDown();
}
$('.snp-subscribeform').on('submit', function() {
$('.hidden-blog').slideDown();
document.cookie="entered_email=true;expire=06/12/2018";
});

You need to set the path on the cookie to "/" which then allows any page on that site to see the cookie. When you do not set a path for the cookie value, it defaults to the path of the current page which restricts the visibility of that cookie to that path only.
Here are some utility functions for dealing with cookies that allow you to set the path or will default the path to "/".
Using these, your code would look like this:
if (readCookie("entered_email") === "1") {
jQuery('.hidden-blog').slideDown();
}
$('.snp-subscribeform').on('submit', function() {
$('.hidden-blog').slideDown();
// cookie path in this function defaults to "/" so all pages on the
// site can access the cookie
createCookie("entered_email", "1", 365 * 3);
});
And, here's the utility cookie management functions:
// createCookie()
// name and value are strings
// days is the number of days until cookie expiration
// path is optional and should start with a leading "/"
// and can limit which pages on your site can
// read the cookie.
// By default, all pages on the site can read
// the cookie if path is not specified
function createCookie(name, value, days, path) {
var date, expires = "";
path = path || "/";
if (days) {
date = new Date();
date.setTime(date.getTime()+(days*24*60*60*1000));
expires = "; expires=" + date.toGMTString();
}
document.cookie = name + "=" + value + expires + "; path=" + 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);
}