d3 is not defined – ReferenceError

Had the same issue, though I initially thought it is because of security restrictions of browser, that wasn’t the case. It worked when I added the charset to the script tag as shown below: <script src=”http://d3js.org/d3.v3.min.js” charset=”utf-8″></script> The same is shown in the d3 docs, though it doesn’t mention this issue specifically: http://d3js.org/ Yes, having … Read more

How can I compare a non-existing JavaScript object to undefined without getting a Reference Error?

Use this: (typeof task === “undefined”) When you use (task === undefined), Javascript needs to find the value of task to see if it is the same as undefined, but it can’t look up the name because it doesn’t exist, giving you the reference error. typeof is special in that it can safely return the … Read more

Uncaught ReferenceError: $ is not defined?

You should put the references to the jquery scripts first. <script language=”JavaScript” type=”text/javascript” src=”https://stackoverflow.com/js/jquery-1.2.6.min.js”></script> <script language=”JavaScript” type=”text/javascript” src=”/js/jquery-ui-personalized-1.5.2.packed.js”></script> <script language=”JavaScript” type=”text/javascript” src=”/js/sprinkle.js”></script>