Get entered value of customiser field for live preview

Question

As per the codex, this question an probably any tutorial on the theme customiser out there, you get the value of a customiser field with the following code:

( function( $ ) {

    //Update site background color...
    wp.customize( 'background_color', function( value ) {
        value.bind( function( newval ) {
            $('body').css('background-color', newval );
        } );
    } );

} )( jQuery );

The problem is you can get that value, when its changed.

My question, is how (in a sane way) can you retrieve the value of another field in that same callback.

E.g.

( function( $ ) {

    //Update site background color...
    wp.customize( 'background_color', function( value ) {
        value.bind( function( newval ) {
            //Get value of field 'text_colour'
            //var text_colour = ??
            $('body').css('background-color', newval );
        } );
    } );

} )( jQuery );

Answer 1

Yes. wp.customize( 'header_textcolor' )():

( function( $ ) {

    //Update site background color...
    wp.customize( 'background_color', function( value ) {
        value.bind( function( newval ) {
            $('body').css('background-color', newval );
            var text_colour = wp.customize( 'header_textcolor' )();
            // ... now do something with text_colour
        } );
    } );

} )( jQuery );