Debugging Dojo Applications (2/10/2010)

Debugging Dojo Applications dojo.connect February 10, 2010 Chris Barber CB1, INC. http://www.cb1inc.com/

About Me ● Chris Barber ● Open source hacker ● Software consultant ● JavaScript, C++, PHP ● Dojo committer ● http://www.cb1inc.com/ ● http://twitter.com/cb1kenobi ● http://slideshare.net/cb1kenobi dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

All Software Has Bugs dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Fixing Bugs Sucks dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Things You Could Be Doing Instead of Fixing Bugs ● Sleeping ● Playing Bioshock 2 ● Reading a book ● Shopping for new shoes ● Working out ● Getting your picture ● Enjoying a frosty brew taken at those little booths at the mall ● Mowing the lawn ● Shoveling snow ● Watching a movie ● Actually, this is worse ● Bowling that fixing bugs ● Doing laundry ● Selling junk on eBay ● Attending this ● Buying junk on eBay presentation! dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Debugging Dojo & JavaScript dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Types of Bugs ● Syntax errors ● Runtime errors ● Logic errors ● Performance issues ● Bugs that other people committed into svn ● Because our code is flawless dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Old School Debugging dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Old School Debugging <form> <textarea name="output"></textarea> </form> <script type="text/javascript"> alert("If you're reading this, it doesn't work."); document.write("x should be 10, but for some reason it's " + x); document.forms[0].output.value += "Loading external resource...n"; document.forms[0].output.value += "Still loading...n"; document.forms[0].output.value += "Hello?n"; </script> dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Old School Debugging ● Write some code, reload, test, write some code, reload test, write some code, reload, test ● But if you write too much code ● Comment out / remove huge chunks of code until things work again ● View source ● What exactly did the server send? var quote_of_the_day = "Who said "debugging" ain't easy?"; dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Old School Debugging ● Custom error handling awesomeness window.onerror = function(msg, url, lineno){ alert("Thou art detects an error:n" + "Message: " + msg + "n" + "URL: " + url + "n" + "Line #: " + lineno); }; function foo(){ var bar = "fail"; dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Old School Debugging ● JavaScript console ● Netscape 4, Mozilla, Firefox ● Internet Explorer ● Generally sucked ● Line # rarely correct ● Crappy error messages – "Object required" dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Old School Debugging ● Microsoft Script ● Microsoft Script Editor Debugger ● Uses Visual Studio ● Steaming pile ● It's on your Office 2003 CDs dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Old School Debugging ● Venkman ● Component of the Mozilla Suite ● Also a Firefox extension ● Sloooooooooooow – Provided it didn't crash dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Not So Old School ● try/catch/throw ● New in ECMAScript 3! – Published Dec 1999 ● Implemented by IE6/NS6 try { if (something) { throw new Error("oh snap!"); } } catch (e) { alert(e); } ● Catches that suppressed errors ● All over Dojo code base ● If something is not working, check if it's being silently being caught dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Advanced Tactics ● Proxy server ● Packet sniffing dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

JavaScript Bugs dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

JavaScript Bugs ● Syntax errors ● Things that the cause the parser to hate life function foo() { foo(1 2); dojo..isFunction(foo); dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

JavaScript Bugs ● Runtime Bugs ● Undefined variables & methods ● Unexpected results foo(); // foo() undefined var i = 10 + x; // x undefined function bar() { return arguments.join(','); } function baz(y) { return y * y; } alert(baz(2)); // undefined! dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

JavaScript Bugs ● Variable scopes ● Watch out for reserved ● Local vs global words! ● Naming ● Rhino (used by Dojo's build tool) is very picky ● Case sentivity break, case, catch, continue, default, delete, do, else, finally, for, ● Try to use unique function, if, in, instanceof, new, names to avoid return, switch, this, throw, try, accidentally overwriting typeof, var, void, while, with abstract, boolean, byte, char, class, ● Use meaningful names const, debugger, double, enum, export, – Unless you need a little extends, final, float, goto, implements, import, int, interface, more job security long, native, package, private, protected, public, short, static, super, synchronized, throws, transient, volatile dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

JavaScript Bugs ● Functions ● Forgetting commas between arguments ● Forgetting braces ● Misspelling funtcion ● Avoid resuing function names function foo(){ alert("hello"); } foo(); // alerts "world" function foo(){ alert("world"); } foo(); // alerts "world" dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

JSON Bugs ● Missing commas ● Hanging commas ● Confusing } and ] ● Not quoting names that contain special chars var i = { var k = [ firstName: "Chris" { lastName: "Barber" "class": "JavaScript", }; "course #": 101 }, var j = { { firstName: "Chris", "class": "C++", lastName: "Barber", "course #": 102 }; }; dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

JavaScript Engine Limits ● Max string length ● Implementation dependent ● Max integer value ● Really, really huge ● Max z-index ● 2,147,483,647 ● ... dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

dojo dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

djConfig.isDebug ● Only useful in browsers that don't have a console ● IE6/7 ● Firefox without Firebug ● Old versions of Opera/Safari dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

djConfig.isDebug ● Automatically loads dojo._firebug.firebug ● Limited functionality ● ReCSS, console, DOM viewer, Object viewer dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

dojo.declare ● Used to define objects ● Careful what you initialize ● Numbers, booleans, & strings are OK ● Arrays & objects are a bad idea – Use constructor() or postCreate() (if a dijit) dojo.declare("MyObj", null, { foo: [ "Hello" ], bar: null, constructor: function() { this.bar = ["baz"]; } }); var obj1 = new MyObj; var obj2 = new MyObj; console.debug(obj1.foo); // outputs ["Hello"] console.debug(obj2.foo); // outputs ["Hello"] obj1.foo.push("world!"); console.debug(obj1.foo); // outputs ["Hello","world!"] console.debug(obj2.foo); // outputs ["Hello","world!"] obj1.bar.push("zap"); console.debug(obj1.bar); // outputs ["baz","zap"] console.debug(obj2.bar); // outputs ["baz"] dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

dojo.declare ● Extending objects ● Invoking an inherited object's method dojo.declare("MyObj", nullj, { foo: function(){ alert("Hi from MyObj!"); } }); dojo.declare("MyNewObj", MyObj, { foo: function(){ alert("Hi from MyNewObj"); this.inherited(arguments); } }); dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

dojo.data ● fetchItemByIdentity() ● Make sure IDs are unique! dojo.require("dojo.data.ItemFileReadStore"); var s = new dojo.data.ItemFileReadStore({ data: { identifier: "id", items: [ { id: "/foo", name: "foo", children: [ { id: "/foo/bar", name: "bar" } ] } ] } }); s.fetchItemByIdentity({ identity: "/foo", onItem: function(item){ console.info(item); }, onError: function(item){ console.error(item); } }); dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Manipulating the DOM ● Wait until onload ● dojo.addOnLoad() or dojo.ready() (new in 1.4) ● If you can't wait, use document.write() dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

dojo.parser ● djConfig.parseOnLoad does not autoload dojo.parser ● Must dojo.require("dojo.parser") ● Can fire the parser manually ● dojo.parser.parse() dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

dojo.require() ● Build system is a little too smart ● Uses regex to find requires if(condition){ dojo.require("my.module"); } if(condition){ dojo["require"]("my.module"); } dojo.requireIf("my.module", condition); dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Closures & dojo.hitch() // assume we're in an object's function... dojo.forEach([1, 2, 3], this.foo); // Error! var _t = this; dojo.forEach([1, 2, 3], function(n){ _t.foo(n) }); dojo.forEach([1, 2, 3], dojo.hitch(this, "foo")); // does the same thing internally as dojo.hitch() dojo.forEach([1, 2, 3], "foo", this); // dojo.connect does the same thing dojo.connect(myButton, "onclick", this, "foo"); dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

file:/// issues ● Firefox 3 security causes issues ● about:config ● security.fileuri.strict_origin_policy = false – http://kb.mozillazine.org/Security.fileuri.strict_origin_policy dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

dojo.deferred ● Use errbacks ● dojo.xhr() returns a deferred function getData(i, n){ return dojo.xhrPost({ url: "/fetchData.php", postData: { id: i, name: n }, handleAs: "json" }); } var deferred = getData(123, "foo"); deferred.addCallback(function(data){ console.log("Whoo!"); }); deferred.addErrback(function(error){ console.error("Oh noes!"); console.error(error); }); dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

dijit dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Widget Params ● Param must be defined before mixin <div dojoType="MyObj" param1="abc" param2="def" param3="ghi"></div> <script type="text/javascript"> dojo.require("dijit._Widget"); dojo.declare("MyObj", dijit._Widget, { param1: "", constructor: function(){ this.param2 = ""; }, postCreate: function(){ console.debug(this.param1); // abc console.debug(this.param2); // def console.debug(this.param3); // undefined } }); </script> dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Template Errors ● 404 File not found ● No root node ● Invalid variables ${foo} ● Variables must be defined before buildRendering() – member variable – initialize in constructor() – initialize in postMixInProperties() dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Template Errors ● Say you want to speed up development ● Do a Dojo build of dojo, dijit, code that is good to go ● Your namespace is "foo" and you have a custom dialog that extends dijit.Dialog ● If using Dojo 1.3.2 or earlier, you MUST define templateString:null before your templatePath ● Otherwise the dijit.Dialog's templateString overrides your templatePath! dojo.declare("foo.MyDialog", dijit.Dialog, { templateString: null, templatePath: dojo.moduleUrl("foo", "MyDialog.html") }); dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Template Errors ● Not an issue with 1.4 and newer ● Just use templateString ● Use dojo.cache! ● You can still use dojo.moduleUrl() dojo.declare("foo.MyDialog", dijit.Dialog, { templateString: dojo.cache("foo", "MyDialog.html") }); // After build, template is inlined! Awesome dojo.declare("foo.MyDialog", dijit.Dialog, { templateString: dojo.cache("foo", "MyDialog.html", "<div>Hi from my dialog!</div>") }); dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Template Errors ● Build system uses regex to inline templates ● Don't get cute (function($){ $.declare("foo.MyDialog", dijit.Dialog, { templateString: $.cache("foo", "MyDialog.html") // NO! }); })(dojo); (function($){ $.declare("foo.MyDialog", dijit.Dialog, { templateString: dojo.cache("foo", "MyDialog.html") // OK! }); })(dojo); dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Templates Caching Issues ● When not using a build, templates are loaded via XHR ● Templates may be cached by the browser ● Definitely in Firefox ● Disable cache or empty cache after template changes dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

postCreate() vs startup() ● postCreate() ● Template created ● Can create new DOM nodes ● Not every widget's postCreate() has been called yet! ● startup() ● Called after a widget and its children have been created and added to the page ● All parent/child widgets created, postCreate() has been called ● Now you can start talking to other widgets :) dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Dijit Themes ● Live coding mistake #253 ● Forgetting to include the dijit theme's css file <link rel="stylesheet" href="/path/to/dijit/themes/tundra/tundra.css" type="text/css"/> dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Dijit Themes ● Live coding mistake #254 ● Forgetting to add the theme name to the body class <body class="tundra"> ... </body> dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Dijit Themes ● Only use what you need! ● Example: you only need a dijit.Calendar // mytundra.css @import url("/path/to/dijit/themes/dijit.css"); @import url("/path/to/dijit/themes/tundra/Common.css"); @import url("/path/to/dijit/themes/tundra/form/Common.css"); @import url("/path/to/dijit/themes/tundra/Calendar.css"); ● Build system inlines only those files! <link rel="stylesheet" href="/path/to/mybuild/mytundra.css" type="text/css"/> dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

The Build System dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Build Profiles ● Define the prefixes you need ● Build system copies each namespace ● Don't need to specify "dojo" prefix dependencies = { stripConsole: "normal", version: "1.4.1", cssOptimize: "comments", copyTests: false, optimize: "shrinksafe.keepLines", layerOptimize: "shrinksafe.keepLines", layers: [ { name: "dojo.js", dependencies: [ "dijit.Dialog", "dijit.layout.BorderContainer", "dijit.layout.ContentPane" ] } ], prefixes: [ [ "dijit", "../dijit" ] ] } dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

ShrinkSafe ● optimize & layerOptimize ● shrinksafe – Awesome for production! ● shrinksafe.keepLines – Awesome for debugging! ● dojo.js & dojo.js.uncompressed.js ● Use the uncompressed version for debugging dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Other Tricks! dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

dojox.analytics ● Use it to send info back to the server ● Dojo startup info ● Window information ● mouseover sampling ● idle activity ● console.* messages <script type="text/javascript" src="/path/to/dojo.js" djConfig="sendMethod:'script', sendInterval:5000, analyticsUrl:'http://example.com/dojox/analytics/logger/dojoxAnalytics.php'" ></script> <script type="text/javascript"> dojo.require("dojox.analytics"); dojo.require("dojox.analytics.plugins.consoleMessages"); dojo.require("dojox.analytics.plugins.dojo"); dojo.require("dojox.analytics.plugins.idle"); dojo.require("dojox.analytics.plugins.mouseClick"); dojo.require("dojox.analytics.plugins.mouseOver"); dojo.require("dojox.analytics.plugins.window"); </script> dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

CSS Tricks ● Disable a style/property by changing the name to something invalid ● x.myStyle{padding:10px;} ● Styling dojo.dnd.Avatars ● Start a drag, then disable JavaScript ● Use Firebug/ReCSS to finish styling ● Empty cache or disable cache to refresh background images dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Missing Images ● Create images and be notified if the image is 404 ● dojox.image.Lightbox uses this technique dojo.create("img", { id: "myimage", src: "/path/to/my/image.jpg", onerror: function(){ dojo.create("img", { id: "missingimage", src: "/path/to/missing/image.jpg" }, dojo.body()); } }, dojo.body()); // note: this code is untested... don't shoot me // if it doesn't work :) dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Performance If it's slow, it's a bug dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Performance ● Use a Dojo build ● Only include the dijit css files you need ● Cache values that won't change ● getViewport(), marginBox(), etc ● Destroy non-visible tab content ● Combine XHR payloads ● Use a profiler ● Write better code dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Performance ● Combine images into sprites ● Additional sprite for repeat-x & repeat-y ● Enable gzip ● Use a CDN ● Or multiple subdomains ● Put scripts at the bottom of the page ● Read Steve Souder's books! ● http://stevesouders.com/ dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Testing dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Test Cases ● Write simple test cases ● Individual html files to test a specific feature ● DOH: Dojo Objective Harness ● Little chunks of code to test stuff dojo.require("doh.runner"); dojo.addOnLoad(function(){ doh.register("myTest", [ function myFunction(){ var foo = []; foo.push(6); foo.push(1); foo.push(2); doh.is(foo.indexOf(1), 2); } ]); doh.run(); }); dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Testing Multiple Browsers ● Use a bunch of old computers ● Or join the modern web development revolution and use a virtual machine ● Virtual Box ● VMware Workstation ● VMware Fusion ● Parallels ● IE6/IE7/IE8 ● FF2/FF3 ● Safari 3/4 ● Opera 9/10 dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Testing Multiple Browsers ● Microsoft Virtual PC Disk Images ● http://tinyurl.com/osoomm Disk Image Expires Size IE6 + XP SP3 April 1, 2010 753.8MB IE7 + XP SP3 April 1, 2010 813.1MB IE8 + XP SP3 April 1, 2010 812.9MB IE7 + Vista 120 days after first run 700.0MB, 700.0MB, 590.5MB IE8 + Vista 120 days after first run 50.6MB, 700.0MB, 700.0MB, 687.9MB dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Tools dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Firefox Extensions ● Lori – Life-of-request info (page load times) ● Tamper Data ● Dated, but can still be useful ● Web Developer Toolbar ● Firebug ● Firecookie ● Yslow ● Many, many, many, many more... dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Firebug ● http://www.getfirebug.com/ ● console.log(), console.debug(), console.info(), console.warn(), console.error() ● Use "," instead of "+": console.debug("x =", x); ● Console ● Debugger ● Profiler ● more... dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Firebug Lite ● http://getfirebug.com/firebuglite ● Bookmarklet ● More featureful than Dojo's FBL dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Webkit Web Inspector ● Chrome/Safari/Epiphany/Titanium ● Enable in Safari from command line: – defaults write com.apple.Safari IncludeDebugMenu 1 ● Console ● Debugger ● Profiler ● more... dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

IE Developer Toolbar ● IE6/IE7 ● DOM viewer ● Modify CSS ● Clear cache dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Internet Explorer 8 ● Integrated into IE8! ● Console ● Debugger dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

IDEs With JavaScript Debuggers ● Netbeans ● http://netbeans.org/kb/67/web/js-debugger-ug.html ● Firefox & IE ● Aptana Studio ● http://www.aptana.org/studio ● Eclipse + Fireclipse ● http://www.almaden.ibm.com/u/bartonjj/fireclipse ● Still active? dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

dair ● Dojo Extensions for Adobe AIR ● http://o.sitepen.com/labs/dair/ ● Debug console ● Command line logger ● File logger dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Resources dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Getting Help ● API Docs ● http://api.dojotoolkit.org/ ● http://docs.dojocampus.org/ ● IRC ● #dojo on irc.freenode.net ● dojo-interest Mailing List ● http://mail.dojotoolkit.org/mailman/listinfo/dojo-interest ● Dojo's source code dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Getting Help CB1, INC http://www.cb1inc.com/ Dojo Consulting Web Applications dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

Thanks! Questions? http://slideshare.net/cb1kenobi http://twitter.com/cb1kenobi dojo.connect | 2.10.2010 | Chris Barber | CB1, INC. | http://www.cb1inc.com/

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Debugging Dojo Applications (2/10/2010)

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Debugging Dojo Applications (2/10/2010) — Presentation Transcript