September 14, 2012
Uncaught ReferenceError: $ is not defined
Question by user1670671
I’ve been getting undefined error and I dont know how to fix it.
Here’s my code:
<script type="text/javascript">
function returnBlurayDisc(member_id){
var xmlhttp;
if (window.XMLHttpRequest){
xmlhttp=new XMLHttpRequest();
}else{
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function(){
if (xmlhttp.readyState==4 && xmlhttp.status==200){
document.getElementById("popup_container").innerHTML=xmlhttp.responseText;
$("#GrayBackground").css({'height':'1900px','display':'inline'});
}
}
xmlhttp.open("GET","ajax/returnAjax.php?member_id="+member_id+"&name="+name);
xmlhttp.send();
}
</script>
The error is Uncaught ReferenceError: $ is not defined. Kindly help me.
Answer by Starx
$ in your code most probably refers to jQuery library. So, make sure you have included jQuery library file in your document.
If you use CDN then you have to include a similar tag like below on head section of your document.
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.1/jquery.min.js"></script>
This includes the JQuery Library on your document and you can finally use the $ to target elements.
