Working on a CartWeaver site, modifying part of the routine whereby different prices are shown on the page when selecting various options from a dropdown list on the product details page, I noticed that in Firefox, the 'onchange' event of the select list only fires if using a mouse, or when tabbing out of the select box using the keyboard ( select list loses focus).
I guess it's always been this way, I just haven't noticed until now. Fortunately there is a very easy fix - append the 'losing of focus' to the 'onkeyup' event, so that either keyboard or mouse have the same effect, causing the browser to register the 'change'.
Original select list is like this:
<select name="sel" id="sel#i#" onchange=" ( function here )" >
Adding just a bit of code for the onkeyup, like so:
<select name="sel" id="sel#i#" onchange=" ( function here )" onkeyup="this.blur();this.focus();">
we now have a list that loses then regains focus everytime a key is pressed (while it has focus), i.e. using the keyboard to move up or down through the options now triggers a split-second loss and regaining of focus, which is enough to trigger the 'onchange()' in firefox. I love a good easy fix!
Thanks to Sanket Vasa for the tip