Javascript : How to check a browser's Do Not Track status?
Problem :
You work for an advertisement network and you want to respect a visitor's Do Not Track status. How to detect or check if a visitor's browser Do Not Track is turn on or off?
Solution :
Use Javascript to extract the doNotTrack variable from the browser.
- Chrome and Firefox based browser use
navigator.doNotTrack
- Safari is
window.doNotTrack
and - Microsoft Internet Explorer use
navigator.msDoNotTrack
The value returned is usually yes
or 1
.
For example, to check Do Not Track status for most common browsers
var DNT = window.doNotTrack == "1" || navigator.doNotTrack == "yes" || navigator.doNotTrack == "1" || navigator.msDoNotTrack == "1";
or
console.log(navigator.doNotTrack);
IF DNT is true, then the browser's Do Not Track is turned ON. If false or unspecified, then OFF.
[This solution will only work properly if Javascript is turned on.]
NOTE :
At the moment of writing, most ads networks will not honor Do Not Track status. Browser based add-on like Privacy Badger will be able to tell you which trackers will honor or ignore the Do Not Track status. In the long run, it will be wise to respect a visitor's decision to turn on Do Not Track.
Special thanks to Mr. Джон Сора of Russia for introducing Privacy Badger to me.
References :
https://developer.mozilla.org/en-US/docs/Web/API/navigator/doNotTrack
By Adam Ng
IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.
Advertisement
Tutorials
+9.9k Golang : Concatenate (combine) buffer data example
+6.6k Golang : Test if an input is an Armstrong number example
+16.8k Golang : Iterating Elements Over A List
+7.5k Golang : Gaussian blur on image and camera video feed examples
+4.5k Unix/Linux : How to find out the hard disk size?
+18.8k Nginx + FastCGI + Go Setup.
+6.8k Golang Hello World Example
+32.6k Golang : Proper way to set function argument default value
+4.9k Fontello : How to load and use fonts?
+10.7k Golang : Print UTF-8 fonts on image example
+10.2k Golang : Display a text file line by line with line number example