Check if another script is loaded without using JQUERY

Question

I have two different that are somewhat depending on eachother (i.e one of the script has a function that calls the other script)

Now i wont go into any details other than saying i am not able to load one before the other.

Because of this i need to make a check in the scripts to check if the other script is loaded (So that the scripts "waits" for eachother).

My Boss does NOT want me to use Jquery so i was wondering is there a way in Plain javascript to check if another script is loaded? And if so how?

Just check if another function is defined? The task have exactly 0 relevance to jQuery. (Obligatory image: i.sstatic.net/ssRUr.gif) — Oleg V. Volkov
– Oleg V. Volkov, Commented Sep 18, 2013 at 11:06

BenM · Accepted Answer · 2013-09-18 11:08:55Z

3

You could check if the function is already defined in the script which calls it, by doing something like:

if(typeof functionName === 'function') 
{
    // function exists so call it
}

That having been said, you'd be much better off to use proper error handling, by wrapping your code inside a try-catch block. So for example within the script that calls a function defined in your external file, you could try:

try 
{
    functionName();
}
catch(e) 
{
    // the call returned an error (likely because functionName() isn't defined).
    // Handle the error nicely.
}

answered Sep 18, 2013 at 11:08

BenM

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2 Comments

Marc Over a year ago

Thank you for your response let me ask you a quick thing how would you make one of t he script wait for the other if the function does not yet exists?

BenM Over a year ago

Aside from using AJAX, you could just wrap it inside setInterval(), and then use a similar check to the first example I posted. As soon as the function becomes defined, execute it and clear the interval.

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