/* * This function parses comma-separated name=value argument pairs from * the query string of the URL. It stores the name=value pairs in * properties of an object and returns that object. */ function getArgs() { var args = new Object(); var query = location.search.substring(1); // Get query string. var pairs = query.split(","); // Break at comma. for(var i = 0; i < pairs.length; i++) { var pos = pairs[i].indexOf('='); // Look for "name=value". if (pos == -1) continue; // If not found, skip. var argname = pairs[i].substring(0,pos); // Extract the name. var value = pairs[i].substring(pos+1); // Extract the value. args[argname] = unescape(value); // Store as a property. // In JavaScript 1.5, use decodeURIComponent() instead of escape() } return args; // Return the object. } /* * We could have used getArgs() in the previous bouncing window example * to parse optional animation parameters from the URL. */ var args = getArgs(); // Get arguments. if (args.x) x = parseInt(args.x); // If arguments are defined... if (args.y) y = parseInt(args.y); // ... override default values. if (args.w) w = parseInt(args.w); if (args.h) h = parseInt(args.h); if (args.dx) dx = parseInt(args.dx); if (args.dy) dy = parseInt(args.dy); if (args.interval) interval = parseInt(args.interval);