I'm learning JavaScript and I see that this question has been asked many times, but I can't get this to work for me.
What I want to do is, show a bootstrap modal once a day.
What I have so far is:
function setCookie(cookiename, cookievalue, expdays) {
var d = new Date();
d.setTime(d.getTime()+(expdays * 24 * 60 * 60 * 1000));
var expires = "expires=" + d.toGMTString();
document.cookie = cookiename + "=" + cookievalue + "; " + expires;
}
function getCookie(cookiename) {
var name = cookiename + "=";
var ca = document.cookie.split(';');
for(var i = 0; i < ca.length; i++) {
var c = ca[i].trim();
if (c.indexOf(name) == 0) return c.substring(name.length, c.length);
}
//I want to check if there is a cookie.
//if I have not set a cookie, I want to show my modal,
//if there is a cookie then return;
//The cookie should expire in one day.
function checkCookie() {
var showed = getCookie("showed");
if (showed != null && showed != "") {
var date = new Date(showed).getDate();
var currentDate = new Date().getDate();
if (currentDate > date) {
return true;
}
return false;
}
return true;
}
Now, if I change the last return true; to return false; my modal does not show up.
The way it is now I see the modal every time.
What am I doing wrong?
How can I fix this?
function setCookie(cookiename, cookievalue, expdays) {
var d = new Date();
d.setTime(d.getTime()+(expdays * 24 * 60 * 60 * 1000));
var expires = "expires=" + d.toGMTString();
document.cookie = cookiename + "=" + cookievalue + "; " + expires;
}
function getCookie(cookiename) {
var name = cookiename + "=";
var startPos = document.cookie.indexOf(name);
if(startPos == -1) return null;
startPos+=(name.length);
if(document.cookie.indexOf(";",startPos) == -1){
return document.cookie.substring(startPos,document.cookie.length);
}
else{
return document.cookie.substring(startPos,document.cookie.indexOf(';',startPos));
}
return null;
}
//I want to check if there is a cookie.
//if I have not set a cookie, I want to show my modal,
//if there is a cookie then return;
//The cookie should expire in one day.
function checkCookie() {
var showed = getCookie("showed");
if (showed != null && showed != "") {
var date = new Date(showed).getDate();
var currentDate = new Date().getDate();
if (currentDate > date) {
return true;
}
return false;
}
return true;
}
Also when setting cookie,
use
setCookie('showed',new Date().toGMTString(),1);
because we are using the value of cookie, not the expire time of cookie to check. So the value must be a datestring
Related
I recently had issues using javascript cookies inside an MTurk HIT. In particular I'm trying to track user preferences w.r.t showing/hiding the HIT instruction.
My approach so far is the following:
<body>
<div id='instructionButton'>
<!-- Button triggering instruction body to collapse/show -->
</div>
<div id='instructionBody'>
<!-- Instruction content (collapsible) -->
...
</div>
</body>
<script>
const instructionBodyId = 'instructionBody';
const instructionButtonId = 'instructionButton';
const cookieName = 'my_cookie_name';
var isInstructionShown = true;
var instrContent = $('#' + instructionBodyId);
var instrButton = $('#' + instructionButtonId);
function setCookie(name, value) {
var date = new Date();
<!-- Cookie valid for 48h -->
date.setTime(date.getTime() + (48 * 60 * 60 * 1000));
var expires = "; expires=" + date.toUTCString();
document.cookie = name + "=" + value + expires + "; path=/";
}
function getCookie(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 toggleInstructions(isShow) {
setCookie(cookieName, isShow);
isInstructionShown = isShow;
if (isShow) {
instrContent.slideDown();
} else {
instrContent.slideUp();
}
}
function prepare_cookie() {
instrButton.click(function() {
toggleInstructions(!isInstructionShown);
});
let cookieVal = getCookie(cookieName);
if (cookieVal == "false") {
toggleInstructions(false);
} else {
toggleInstructions(true);
}
}
$(document).ready(function() {
prepare_cookie();
});
</script>
The code above shows part of the HIT layout I'm creating, and when testing it out while editing the HIT directly in MTurk, the cookie works as expected (it shows up in Google Chrome and works as expected, showing/hiding the instruction automatically).
Unfortunately, when publishing the HIT, the cookie does not seem to be set (it does not appear in the list of cookies shown in Google Chrome).
I need to delete a specific cookie from a website. At first I have tried several ways to delete ALL cookies, however none of them worked properly (not all cookies were deleted).
I also tried the below code to find the cookie I need to delete, but I can't figure out how to delete it after found it.
Can anyone help?
function getCookie(name) {
var dc = document.cookie;
var prefix = name + "=";
var begin = dc.indexOf("; " + prefix);
if (begin == -1) {
begin = dc.indexOf(prefix);
if (begin != 0) return null;
}
else
{
begin += 2;
var end = document.cookie.indexOf(";", begin);
if (end == -1) {
end = dc.length;
}
}
return decodeURI(dc.substring(begin + prefix.length, end));
}
function deleteCookie() {
var myCookie = getCookie("dropin_date");
if (myCookie == null) {
}
else {
// if cookie exists delete it
}
}
deleteCookie();
check this out.
function accessCookie(cookieName) {
var name = cookieName + "=";
var allCookieArray = document.cookie.split(';');
for(var i=0; i<allCookieArray.length; i++)
{
var temp = allCookieArray[i].trim();
if (temp.indexOf(name)==0)
return temp.substring(name.length,temp.length);
}
return "";
}
var delete_cookie = function(name) {
document.cookie = name + '=;expires=Thu, 01 Jan 1970 00:00:01 GMT;';
};
var mycookie = accesCookie('test');
if(mycookie != ''){
delete_cookie('test');
}
In order to delete a cookie set the expires date in the past. it will delete automatically
I have this code for detecting android:
var mobile = (/android/i.test(navigator.userAgent.toLowerCase()));
if (mobile){
alert("Message to android users");
}
...but how do I get that script to also set a cookie so the android user doesn't continue getting the alert (either on reloading the page, returning later to the page, or navigating to other pages which have the alert)?
I also have this, which uses a cookie to avoid a user viewing a "welcome page" they've already seen:
var RedirectURL = "http://www.example.com/real-home-page.html";
var DaysToLive = "365";
var CookieName = "FirstVisit";
function Action() {
location.href = RedirectURL;
}
DaysToLive = parseInt(DaysToLive);
var Value = 'bypass page next time';
function GetCookie() {
var cookiecontent = '';
if(document.cookie.length > 0) {
var cookiename = CookieName + '=';
var cookiebegin = document.cookie.indexOf(cookiename);
var cookieend = 0;
if(cookiebegin > -1) {
cookiebegin += cookiename.length;
cookieend = document.cookie.indexOf(";",cookiebegin);
if(cookieend < cookiebegin) { cookieend = document.cookie.length; }
cookiecontent = document.cookie.substring(cookiebegin,cookieend);
}
}
if(cookiecontent.length > 0) { return true; }
return false;
}
function SetCookie() {
var exp = '';
if(DaysToLive > 0) {
var now = new Date();
then = now.getTime() + (DaysToLive * 24 * 60 * 60 * 1000);
now.setTime(then);
exp = '; expires=' + now.toGMTString();
}
document.cookie = CookieName + '=' + Value + exp;
return true;
}
if(GetCookie() == true) { Action(); }
SetCookie();
Can the second script be adapted and combined into the first to do something like:
function Action() {
don't-open-that-alert-again;
I've googled and found some js cookie scripts, but all over 100K. Prefer something as succinct as the above.
How would i pass my current timer's timing into the next page?
Timer code
var expires = new Date();
expires.setSeconds(expires.getSeconds() + 60); // set timer to 60 seconds
var counter = setInterval(timer, 1);
function timer() {
var timeDiff = expires - new Date();
if (timeDiff <= 0) {
clearInterval(counter);
document.getElementById("timer").innerHTML = "00:00";
return;
}
var seconds = new Date(timeDiff).getSeconds();
var milliSeconds = (new Date(timeDiff).getMilliseconds()/10).toFixed(0);
var seconds = seconds < 10 ? "0" + seconds: seconds;
var milliSeconds = milliSeconds < 10 ? "0" + milliSeconds: milliSeconds;
document.getElementById("timer").innerHTML = seconds + ":" + milliSeconds; // watch for spelling
}
I'm using
<h3 style="color: #ff0000; margin: 0; padding: 0; font-size: 100%;font-weight:normal; font-family: robotolight;"> You have <div id="timer"></div> to complete the game!
in my html.
Is there a way to pass div id='timer'> into the next page?
Thanks.
Reloading the page or loading a new page means reloading javascript since it is runs in the context of the current page. There is good way to pass along javascript variables to a new page; it requires some form of data persistence. Cookies and localStorage are two of the most common ways of persisting data client-side.
Client cookies are written to the browser cache and are transparent in HTTP headers. LocalStorage is a newer mechanism but well supported, allowing up to 5MB of browser storage without passing in headers.
In your use case, instead of storing the timer it would probably make sense to store the timestamp when the timer was started. That way it can be recalculated in the next page from this one static start value.
var timerStart;
var expireDate = new Date();
function displayTimer(){
var now = new Date().getTime();
var timerStart = timerStart || cookieTimer();
val timeDiff = now - timerStart;
document.getElementById("timer").innerHTML = timeDiff.toString();
if(timeDiff > expireDate.getTime()) clearInterval(timerInterval);
}
val timerInterval = setInterval(displayTimer, 1);
// Using cookies
function cookieTimer(){
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) != -1) return c.substring(name.length,c.length);
}
return "";
}
function setCookie(cname, cvalue, expireDate) {
var d = new Date();
d.setTime(d.getTime() + expireDate.getTime());
var expires = "expires="+d.toUTCString();
document.cookie = cname + "=" + cvalue + "; " + expires;
}
var timerCookie = getCookie("timer");
if(timerCookie !== "") return new Date(timerCookie).getTime());
else {
setCookie("timer", timerStart, expireDate);
return new Date().getTime();
}
}
// Using localStorage
function localStorageTimer(){
function setLocalStorageObject(key, obj, expireDate){
obj.expires = expireDate.getTime();
localStorage.setItem(key, JSON.stringify(obj));
}
function getLocalStorageObject(key){
val item = localStorage.getItem(key);
if(item) return JSON.parse(item);
else return {};
}
var timerLocal = getLocalStorageObject("timer");
var now = new Date().getTime();
if(timerLocal && timerLocal.startTime && timerLocal.expires > now) return timerLocal.startTime;
else {
setLocalStorageObject("timer", { startTime: now });
return now;
}
}
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.