I am testing with pure JavaScript if browser seems to support HTML5 and if so, I want to load jQuery and then process the rest of page. If not, some redirection will occur.
<script type="text/javascript">
var canvas = document.createElement('canvas');
if (canvas && canvas.getContext && canvas.getContext('2d')) {
var s = document.getElementsByTagName('script')[0];
var jq = document.createElement('script');
jq.type = 'text/javascript';
jq.src = 'js/jquery.js';
s.parentNode.insertBefore(jq, s);
}
else {
// ... redirection ...
}
</script>
<script type="text/javascript">
$(function () {
//...
}
</script>
But the code above is not working properly, because I got error
Uncaught ReferenceError: $ is not defined
which is clearly saying that jQuery library has not been loaded.
Why? What is wrong with conditional script loading in my code above?