[Solved] How can you make a Theme Customizer setting update the site preview instantly without page reload? — Ans: Set 'transport' => 'postMessage' in add_setting() and add JavaScript to handle... | Wordpress

Wordpress - Themes and Appearance

How can you make a Theme Customizer setting update the site preview instantly without page reload?

ASet 'transport' => 'postMessage' in add_setting() and add JavaScript to handle live preview

BSet 'transport' => 'refresh' in add_setting() to enable instant preview

CAdd 'live_preview' => true in add_control() options

DUse add_section() with 'live_update' => true

Step-by-Step Solution

Solution:

Step 1: Understand 'transport' option
Setting 'transport' to 'postMessage' enables JavaScript-based live preview without full reload.
Step 2: Recognize need for JS handler
JavaScript must listen for changes and update preview dynamically.
Step 3: Evaluate other options
'refresh' causes full reload, 'live_preview' and 'live_update' are invalid options.
Final Answer:
Set 'transport' => 'postMessage' and add JS for live preview -> Option A
Quick Check:
Instant preview = transport 'postMessage' + JS [OK]

Quick Trick: Use 'postMessage' transport with JS for live preview [OK]

Common Mistakes:

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How can you make a Theme Customizer setting update the site preview instantly without page reload?