javascript is future - Page 477

How do I pass a variable number of parameters along with a callback function?

- by Bungle

I'm using a function to lazy-load the Sizzle selector engine (used by jQuery): var sizzle_loaded; // load the Sizzle script function load_sizzle(module_name) { var script; // load Sizzle script and set up 'onload' and 'onreadystatechange' event // handlers to ensure that external script is loaded before dependent // code is executed script = document.createElement('script'); script.src = 'sizzle.min.js'; script.onload = function() { sizzle_loaded = true; gather_content(module_name); }; script.onreadystatechange = function() { if ((script.readyState === 'loaded' || script.readyState === 'complete') && !sizzle_loaded) { sizzle_loaded = true; gather_content(module_name); } }; // append script to the document document.getElementsByTagName('head')[0].appendChild(script); } I set the onload and onreadystatechange event handlers, as well as the sizzle_loaded flag to call another function (gather_content()) as soon as Sizzle has loaded. All of this is needed to do this in a cross-browser way. Until now, my project only had to lazy-load Sizzle at one point in the script, so I was able to just hard-code the gather_content() function call into the load_sizzle() function. However, I now need to lazy-load Sizzle at two different points in the script, and call a different function either time once it's loaded. My first instinct was to modify the function to accept a callback function: var sizzle_loaded; // load the Sizzle script function load_sizzle(module_name, callback) { var script; // load Sizzle script and set up 'onload' and 'onreadystatechange' event // handlers to ensure that external script is loaded before dependent // code is executed script = document.createElement('script'); script.src = 'sizzle.min.js'; script.onload = function() { sizzle_loaded = true; callback(module_name); }; script.onreadystatechange = function() { if ((script.readyState === 'loaded' || script.readyState === 'complete') && !sizzle_loaded) { sizzle_loaded = true; callback(module_name); } }; // append script to the document document.getElementsByTagName('head')[0].appendChild(script); } Then, I could just call it like this: load_sizzle(module_name, gather_content); However, the other callback function that I need to use takes more parameters than gather_content() does. How can I modify my function so that I can specify a variable number of parameters, to be passed with the callback function? Or, am I going about this the wrong way? Ultimately, I just want to load Sizzle, then call any function that I need to (with any arguments that it needs) once it's done loading. Thanks for any help!

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