jQuery adapter - use valHooks

[AlexW]

The jQuery adapter can make use of the valHooks feature instead of overriding val().

if ( CKEDITOR.config.jqueryOverrideVal ) {
    jQuery.valHooks[ 'textarea' ] = {
        get: function( elem ) {
            var $this = jQuery( elem ),
                editor = $this.data( 'ckeditorInstance' );
            
            if ( editor ) return editor.getData();
        },
        set: function( elem, value ) {
            var $this = jQuery( elem ),
                editor = $this.data( 'ckeditorInstance' );
            
            if ( editor ) editor.setData( value );
        }
    };
}

[Jakub Ś]

valHooks allow you to override the default behaviour of .val() for any jQuery-accessible object

We rewriting jQuery adapter at the moment and we will be using valHooks (we are already using them).

This ticket can be included into #10281 (umbrella ticket for adapter).

[Piotr Jasiun]

in branch/ticket #10281

[Olek Nowodziński]

Due to the asynchronous nature of editor.setData() and implemented promises we decided to not to use valHooks but to override val().