The jQuery source is pretty easy to read, and you can look at what the data function is doing. To summarize: jQuery has a variable called ‘expando’ which is ‘jQuery’+(+new Date) jQuery has another variable called uuid which starts with “1” jQuery.cache is an empty object Setting/Getting any “data” on a HTML Element/Object will use … Read more
Here’s one technique that I’ve found helpful: Open the Developer Tool Bar (hit F12) Go to the “Script” tab Click the “Start Debugging” button Next, type “debugger” into the console and hit enter. This should trigger a break point. Go to the “Watch” sub-tab Click the row that says, “Click to add…” and enter a … Read more
[UPDATE] The original question, and the answer below applied specifically to the IE11 preview releases. The final release version of IE11 does in fact provide the ability to switch browser modes from the Emulation tab in the dev tools: Having said that, the advice I’ve given here (and elsewhere) to avoid using compatibility modes for … Read more
If your goal is to find CSS selectors you can use MRI (once MRI is open, click any element to see various selectors for the element): http://westciv.com/mri/ For Xpath: http://functionaltestautomation.blogspot.com/2008/12/xpath-in-internet-explorer.html
This example is from IE8, but the same return is from IE6+ and most other IE browsers. IE before #9 does not define it for host objects var o=window;// or document or document elements o.hasOwnProperty /* returned value: (undefined) undefined */
The rendering mode in Internet Explorer 11 can appear stuck if the site is added to your local Compatibility View list. When this happens, the rendering mode inside the developer tools and out will default to the specified compatibility settings. While this may not be the only way a site can get on this list, … Read more
I discovered today that we can now debug Javascript With the developer tool bar plugins integreted in IE 8. Click ▼ Tools on the toolbar, to the right of the tabs. Select Developer Tools. The Developer Tools dialogue should open. Click the Script tab in the dialogue. Click the Start Debugging button. You can use … Read more
Try if (!window.console) console = … An undefined variable cannot be referred directly. However, all global variables are attributes of the same name of the global context (window in case of browsers), and accessing an undefined attribute is fine. Or use if (typeof console === ‘undefined’) console = … if you want to avoid the … Read more