javascript load other script - call function - undefined

Question

I have this JS:

<script type="text/javascript">
var aaascript = document.createElement('script'); aaascript.type = 'text/javascript';
aaascript.src = ('https:' == document.location.protocol ? 'https://xxx' : 'http://xxx') + '/aaa.js';
var aaas = document.getElementsByTagName('script')[0]; aaas.parentNode.insertBefore(aaascript,aaas);
callthis('somevalue');
</script>

this code generates a script tag and inserts it to the page. in the script aaa.js is the function callthis. but when I call the function there is this error:

Uncaught ReferenceError: callthis is not defined (anonymous function)

what goes wrong here?

Most probably due to the fact that you are loading it at runtime via javascript it is not being parsed ergo you do not have the methods available. Needs some testing though. Are you receiving any errors whatsoever or are there any variables in there that are available? Consider using this stackoverflow.com/questions/3261408/… instead if possible. — Alex Costea
– Alex Costea, Commented Oct 4, 2013 at 8:26
no there are no other errors. I cant use jquery in this case, need plain js — Danzzz
– Danzzz, Commented Oct 4, 2013 at 8:30
I realise you're not after a jQuery solution but for others' reference: the getscript or ajax methods Alex linked to can be used to load the script. Using your example, you would still need to delay calling callthis() until the script is loaded, by wrapping it in a function and putting it in the success parameter of those jQuery methods. — Simon Robb
– Simon Robb, Commented Oct 4, 2013 at 8:36

Simon Robb · Accepted Answer · 2013-10-04 08:30:46Z

2

The script tag is being created but the script is then loaded from the server. callthis() is being called in between these two events; that is, before the script is fully loaded, and so the method doesn't exist.

Use the .onload event of the script tag to delay calling callthis() until the script is fully loaded, as documented here.

answered Oct 4, 2013 at 8:30

Simon Robb

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