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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>cPanel JavaScript Style Guide</title> </head> <body> <script type="text/javascript"> //<![CDATA[ // specifying the type on the script tag really isn't necessary, but it doesn't hurt anything and allows for w3 validation // ditto escaping the <![CDATA[ - not something that really matters much, but allows for w3 validation when using the XHTML doctype // if we ever want to simplify/change these opening tags it will be easy to do with an automated script as long // as we're consistent in applying them across the product // priorities: // 1. Consistency // 2. Readability // 3. Match as much existing code as possible. // principles: // > when in doubt, be more verbose // > use standard JavaScript functions supported in all browsers, be consistent in the functions you use and the way that you use them // variables in the global scope should always be in all caps var GLOBAL; // only use global variables when necessary and/or it makes sense to // good examples of global variables: // TODO: example here // bad examples of global variables: // TODO: example here // use literal notation for functions to remind you that functions are just objects var toggle_panel = function(id) { // your function in here }; // user unix_hacker style variable names, not camelCase var row_length = 5; // declare arrays using [] and objects using {} var array = []; var obj = {}; // try to write all loops consistently and on one line for (var i = 0; i < array.length; i++) { // do something } // if you need to deviate from a full iteration, be sure to comment how or why // we only need every other entry of the array because ... for (var i = 0; i < array.length; i += 2) { // do something } // if you have a long iteration (10,000+) or a loop that runs very often on a page (ie: on a mouse movement event) // it's OK to pre-calculate the array length var len = array.length; for (var i = 0; i < len; i++) { // do something } // follow this format for if/else statements if (row_length == 5) { alert("Row length is five."); } else { alert("Row length is not five."); } // use ternary operators for simple assignments // good use of ternary var zebra_class = (i % 2 == 0) ? "rowA" : "rowB"; // bad use of ternary (taken from filemanager.js ;) var sUrl = "listfiles" + (usejson ? '.json' : (useaspx ? '.aspx' : '.xml')) + "?types=dir&dir=" + node.data.path; // put a space after the ! operator var el = document.getElementById("foo"); if (! el) return; // it is OK to exit a function "early" using return var toggle_div = function(id { var el = document.getElementById(id); // exit the function if el does not exist if (! el) return; // do something with el }; //]]> </script> </body> </html>
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