“Not authorized” error due to Safari “private browsing” mode! :P

This is just a quick post to share my misadventure with Safari and the “private
browsing” mode. I’m working on a small JavaScript library which has the goal to abstract SQLite database api and allow users to create table, insert, update and delete
records easily… my code seems to work very well, but this morning during some
tests, I got the “not authorized” exception (error code n°1) on every
transaction. After hours of debugging I realized that my code was ok, but I forgot
to disable the “private browsing” mode in Safari!
So, bear in mind, if you want to play with database api and other client-related store capabilities (such cookies), remember to disable that option in Safari ;)

Jetpack: building Firefox plugin with Javascript (and jQuery)

I discovered a couple of days ago a new open source project from Mozilla labs: Jetpack.
It’s an “API set” which allows to build Firefox’s plugins by using Javascript, HTML (including new HTML 5 tags: “video” and “audio“) and CSS (oh yes, in a single word Ajax).
Jetpack is still in an early development phase and released as 0.1 version.
Here you can find the (really brief) api documentation and here some examples.
I would like to try it in the future

Using getAttribute() to retrieve the label’s "for" attribute returns NULL on internet explorer!

Damned Internet Explorer!!! I’ve just faced another browser issue by using the javascript function getAttribute() in order to retrieve the “for” value of a form’s label, ie:

myLabel.getAttribute("for");

(where “myLabel” is a reference to a <label> node)
The function always returns NULL, even if the “for” attribute is manually specified into HTML code, ie:

<label for="my_field_id">my label</label>

Fortunately, after a brief search on Google, I’ve found a post on quirksmode.org, which contains a comment by Tino Zijdel, that show an easy and crossbrowser solution to get the “for” attribute (that can be used both to set a value or to get it):

myLabel.htmlFor

Thank you Tino!

In my search I’d even discovered that on Internet Explorer getAttribute() is different from other browsers, because it offers an extra argument called “iFlags” that is a number that can be 0, 1 or 2 (genial!) and means (I’m reporting the official microsoft documentation):

0 -> Default. Performs a property search that is not case-sensitive, and returns an interpolated value if the property is found
1 -> Performs a case-sensitive property search. To find a match, the uppercase and lowercase letters in AttributeName must exactly match those in the attribute name. If the iFlags parameter for getAttribute is set to 1 and this option is set to 0 (default), the specified property name might not be found.
2 -> Returns the value exactly as it was set in script or in the source document

It would be a better world without Internet Explorer!

View the generated source code in internet explorer with a bookmarklet

internet explorer sucksAs all knows, in browser like Firefox, in order to view the generated source code of a page (that is the final HTML which the browser display into the window, so it includes JS generated nodes and SSI inclusions) we have simply to select all (ctr+A or command+A on a Mac) and choose “View selection source”. Internet Explorer instead doesn’t offers the ability to view the generated source but only the basic HTML code (whic doesn’t include dynamic generated content). To have such feature, I’ve used the innerHTML property to get the final content of <html> tag, and I’ve realized a bookmarklet to call after the loading of the page. The bookmarklet opens an 800×600 resizable popup with a textarea that shows the HTML code.

This is the code of the bookmarklet:
javascript:var p=window.open("","p","width=800,height=600,resizable=yes");p.document.open();p.document.write('');p.document.close();void(0);
to use it, simply copy and paste into the ie address bar and press enter ;-)