I'm having an issue with calling a function from a external linked JS file. The file is linked like so in the header of the page: - <script type="text/javascript" src="file.js"></script>
And the function that exists in the file.js is called from the body of the html page like so but its not working??? - <script>myfunction('test');</script>
-
20  3308 
try - <script type="text/javascript">myfunction('test');</script>
if that fails too, have a look at the error console.
That didn't work, the error console is saying:
myfunction is not defined
But it is in the JS file!?
did you check writing (JS is case sensitive, so myfunction() and myFunction() are different)?
Yup, checked this and its all ok, its a stange one as its the way i've always called functions from an external JS file!?!
can you post a link to that file?
This is all thats in the file: - function myfunction(input) {
-
document.write(input);
-
}
are you sure the file is loaded correctly?
@Dormilich
Ahh! That's the point ;)
Actually what i think that when he calls the "function" then the JS file not loaded.
You better to keep your "this type of function(what you call inside HTML body)" in your script tag. -
<script>
-
//some function definitions
-
</script>
-
....
-
....
-
....
-
....
-
<script>/*call the function*/</script>
-
....
-
....
-
@dmjpro
this sure solves the problem, but you pay it with bandwidth traffic and download time (this is no problem when having only some very small functions, but if you need the benefits of larger libraries, this is not an option)
some background:
external JS files are treated similar to images, if the browser has this file cached (i.e. in its memory), it will only look if the server provides a newer file and only in that case the file is loaded again (relevant when you need a script on many pages)
Then first time it will not work.
And how can i make sure when i make this call then my external file gets loaded completely? ;)
@dmjpro
if you have access to the HTTP request (e.g. in FireBug*) you'll see a 404 status for that file. (200 for all OK, 304 for file not changed) @dmjpro
a simple test is - if (myfunction) alert("myfunction() exists");
* Firefox WebDev extension
@Dormilich
The code must be like this .. -
if(typeof myfunction!= 'undefined') //some code
-
Yeah i thought of this..If i need to call that "function" at that moment then ?
@dmjpro
throw an Exception* and quit. but usually there's no problem in including an external file**.
* seen at MDC
** especially if you manage to separate JS code from HTML. some handy functions for this are provided through the event handlers. further you can replace document.write() calls by DOM manipulation (createElement(), appendChild(), …).
Wouldn't -
window.onload = function ()
-
{
-
myfunction();
-
}
-
overcome that problem too?
Or calling it from <body onload="myfunction()">?
@Markus
I (personally) don't consider that as an option.
although the original problem is (I think) rather, whether the external file is loaded or not. otherwise I can't imagine what cause should be there for the error message.
@Markus
See "onLoad" event fired when page loaded completely. Now before getting loaded fully page needs to do something which will be by JavaScript that's where the context comes in ;)
What i saw in GMail ... basically the Mail ID box gets focus first then at "onLoad" the Password box gets focus.
@dmjpro
what advantage should that have? the password box is the first item to be used, I don't see a benefit for marking the ID box first (besides that you can mimic that with a little timeout).
@Markus
What you posted .. "ziycon" needs to execute some JS code before the page getting loaded fully but you suggested to execute this after the page loaded fully ;)
@Dormilich
Actually what i meant here .... before page loading fully Mail ID box gets focus and after page loaded fully the Password box gets focus. That's what i said .. Actually i am not against this policy, it should be .. Actually What "Markus" said, with respect to that post i gave an example.
May be some confusion created over here ;) sorry!
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