The code presented in this page can be used to detect if the visitor has an Ad-Blocker that blocks Ads in page, and to display a friendly message to visitor when the JavaScript is disabled or Ads are blocked.
The script was tested with Adblock Plus.

Script code

- Just add the following HTML /CSS /JS code in the pages of your website.

<style>
#jsad_notify{
background:#f8f800;
border:2px solid #0000be;
color:#ee0000;
font-size:20px;
font-weight:700;
margin:0;
padding:2px;
position:fixed;
top:40px;left:1%;right:1%;
text-align:center;
max-width:98vw;
}
</style>

<div id='jsad_notify'>
Parts of this site works with JavaScript enabled; and without AdBlock.<br>
Please consider supporting us by disabling your Ad-Blocker on this website.
</div>

<script>
//if JavaScript enabled, it hides #jsad_notify
var jsad_notify = document.querySelector('#jsad_notify');
jsad_notify.style.display ='none';

//adds a child-element in page which usually is blocked by Ad-Blocker
var test_adb = document.createElement('div');
test_adb.innerHTML ='&nbsp;';
test_adb.className ='adsbox';
document.body.appendChild(test_adb);
window.setTimeout(function(){
 //if Ads blocked it shows the message, else it removes the #jsad_notify
 if(test_adb.offsetHeight ===0) jsad_notify.style.display ='block';
 else jsad_notify.outerHTML ='';

 document.body.removeChild(test_adb); //removes test_adb elm.
}, 700);
</script>

To change the position and design of the message, edit the CSS properties of the #jsad_notify element.

Daily Test with Code Example

HTML
CSS
JavaScript
PHP-MySQL
Which attribute indicates that an input field must be filled out before submitting?
required="required" autofocus="autofocus" placeholder="text"
<input type="text" name="name1" required="required" />
Which CSS method increases or decreases the size of the HTML element (including its content)?
translate() scale() skew()
#some_id:hover {
  transform: scale(2, 1.5);
  -ms-transform: scale(2, 1.5);    /* IE 9 */
  -moz-transform: scale(2, 1.5);   /* Firefox */
}
Click on the Date object method that returns the day of the month.
setDate() getMonth() getDate()
var rightnow = new Date();
var day = rightnow.getDate();
alert(day);
Which function is used to upload a file on server?
is_file() move_uploaded_file() fopen()
if(move_uploaded_file($_FILES["field_name"]["tmp_name"], "dir/file_name")) {
  echo "The file succesfully uploaded";
}
Show a message if JavaScript disabled or Ad-Blocker

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