Re:morse.nl

Even Macs do weird things. If you’ve connected a second display to your Mac it might be a false identification which makes your screen really blurry or even display an “Out of sync” message. This can be fixed easily in OS X by removing or renaming the file Library/Preferences/com.apple.windowserver.plist and rebooting your Mac — that last step is in most cases not even necessary.

When you close Firefox you’ll get a warning to lose all current open tabs and until recently I didn’t know there was an option available to save your current session. If you open the preferences of Firefox, you’ll see the screen as shown below. Select the option: ‘When Firefox starts: Show my windows and tabs from last time’ and you’ll be set to go. Restart Firefox and notice that your tabs still exists.

In some rare cases you might want to add a self defined attribute to an element. This can be handy to store additional data you might need in your application. Take the following HTML code for example:

<form name="clientEdit" action="/client.php" method="POST">
<!-- ...other form stuff here... -->
<select name="client">
    <option id="1" billable="1">Clint</option>
    <option id="2" billable="0">Steve</option>
    <option id="3" billable="1">Chris</option>
    <option id="4" billable="1">Rick</option>
</select>

The added attribute ‘billable’ will be used to check if a client can be billed by our application. Using javascript you can disable the invoice button or display an alert when a non-billable client — in this case Steve — has been selected.

To get the billable attribute you can use the getAttribute() function like in the following example.

/* <![CDATA[ */
function createInvoice()
{
    with(document.forms['clientEdit'])
    {
        if(client.options[client.selectedIndex].getAttribute('billable') == 1)
        {
            alert("Client is billable, create the invoice");
        }
    }
}
/* ]]> */

As you can see, it’s simple to get the value of the attribute.