wecobble/Subtitles

/**
 * Subtitles plugin JavaScript
 *
 * @since 1.0.0
 */
(function( $, undefined ) {
    /**
     * Presentational JS which fires on DOM load
     *
     * @since 1.0.0
     */
    function documentScripts() {
        /**
         * Toggle screen-reader-text class on the subtitle
         * input field. When a user loads a new post page,
         * there will be input field placeholder text that
         * reads "Enter subtitle here". When the user clicks
         * the subtitle input field, then the text will have
         * the class screen-reader-text added to it so that
         * it's no longer visible. If the user edits a pre-existing
         * post subtitle and removes it altogether, then the
         * class screen-reader-text will also be added to it.
         *
         * @since 1.0.0
         */
        $( '#subtitle' ).each( function() { // Cribbed from WordPress' dashboard.js
            var input  = $( this ), // Subtitle input
                prompt = $( '#' + this.id + '-prompt-text' ); // The subtitle label

            if ( '' === this.value ) { // If the input is blank on page load then show helper text.
                prompt.removeClass( 'screen-reader-text' );
            }

            prompt.click( function() { // Hide the helper text when the subtitle input label is clicked on.
                $( this ).addClass( 'screen-reader-text' );
                input.focus();
            } );

            input.focus( function() { // Hide the helper text when the subtitle input is clicked on.
                prompt.addClass( 'screen-reader-text' );
            });

            input.blur( function() { // When input has lost focus and it's empty show helper text.
                if ( '' === this.value ) {
                    prompt.removeClass( 'screen-reader-text' );
                }
            });

            // Tab from the title to the subtitle, rather than the post content.
            $( '#title' ).on( 'keydown', function( event ) {
                if ( 9 === event.keyCode && ! event.ctrlKey && ! event.altKey && ! event.shiftKey ) {
                    $( '#subtitle' ).focus();

                    event.preventDefault();
                }
            });

            // Tab from the subtitle directly to post content. Borrowed from post.js.
            $( '#subtitle' ).on( 'keydown.editor-focus', function( event ) {
                var editor, $textarea;

                if ( 9 === event.keyCode && ! event.ctrlKey && ! event.altKey && ! event.shiftKey ) {
                    editor = 'undefined' !== typeof tinymce && tinymce.get( 'content' );
                    $textarea = $( '#content' );

                    if ( editor && ! editor.isHidden() ) {
                        editor.focus();
                    } else if ( $textarea.length ) {
                        $textarea.focus();
                    } else {
                        return;
                    }

                    event.preventDefault();
                }
            });
        });
    }

    $( document ).ready( documentScripts );
})( jQuery );