I’m currently working on a lengthy set of articles that are intended to provide an in-depth look at the WordPress Theme Customizer. Yes, there has been a lot of material already written on this subject.
Some of the best articles are:
- Otto’s guide to the WordPress Theme Customizer
- The comprehensive Codex article on the Theme Customization API
- And an open source example of how to use the Theme Customizer
And though I’ve done work with the Theme Customizer in the past, there have been a few gotchas that I’ve found when trying to work with the customer starting from the ground up.
I don’t plan to document them all here, but if you happen to be working with the Theme Customizer and you’re specifically trying to get the “Live Preview” function working and it’s not, perhaps this will help.