Linking Javascript files?

Question

Hello,

I am putting together a little website and have come stuck with this:

I am trying to write some Javascript code, in separate files from the web page since the code will be used in several places. One file has the commonly used code with smaller files loaded as and where it is needed alongside this larger common file. This reduces the file sizes quite a bit, no need to load lots of info if not needed.

Anyway, I have 2 files with functions in each. File 1 has say, functionA, file 2 has FunctionB

I want FinctionB to get the output from FunctionA to process it. Easy to do if the functions are both in the same file but these are in separate files - is there a way to link the 2 separate files to that the output of FunctionA can be used by FunctionB (and without having to put FunctionB in the same file as FunctionB since this would make a very large file)


Not interested really in "Don't use that method, use another method" type of answers, just the technical way to call FunctionA within FinctionB


Cheers

Matt · Accepted Answer

This should present no problem, provided that functionA has loaded when it is called by functionB.  A way to ensure that this is the case, would be to dynamically load the common script from within your smaller script as a sort of dependency, and then set a callback method to fire when the script is loaded.

For example:

function loadScript(url, callback){

var script = document.createElement("script")
    script.type = "text/javascript";

if (script.readyState){  //IE
        script.onreadystatechange = function(){
            if (script.readyState == "loaded" ||
                    script.readyState == "complete"){
                script.onreadystatechange = null;
                callback();
            }
        };
    } else {  //Others
        script.onload = function(){
            callback();
        };
    }

script.src = url;
    document.getElementsByTagName("head")[0].appendChild(script);
}

loadScript("functionA.js", function(){
    // call function A after script is loaded
    functionA();
});

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Linking Javascript files?

1 Answer