add support for title live preview in customizer

js/customizer.js

@@ -0,0 +1,20 @@
+
+/**
+ * This file adds some LIVE to the Theme Customizer live preview. To leverage
+ * this, set your custom settings to 'postMessage' and then add your handling
+ * here. Your javascript should grab settings from customizer controls, and
+ * then make any necessary changes to the page using jQuery.
+ *
+ * @see https://codex.wordpress.org/Theme_Customization_API#Part_3:_Configure_Live_Preview_.28Optional.29
+ */
+( function( $ ) {
+
+    // Update the site title in real time...
+    wp.customize( 'blogname', function( value ) {
+        value.bind( function( newval ) {
+            console.log(newval);
+            $( '.navbar-header a' ).html( newval );
+        } );
+    } );
+
+} )( jQuery );