Initial commit. State 04.2021.

wp-admin/js/custom-background.js

@@ -0,0 +1,75 @@
+/* global ajaxurl */
+(function($) {
+	$(document).ready(function() {
+		var frame,
+			bgImage = $( '#custom-background-image' );
+
+		$('#background-color').wpColorPicker({
+			change: function( event, ui ) {
+				bgImage.css('background-color', ui.color.toString());
+			},
+			clear: function() {
+				bgImage.css('background-color', '');
+			}
+		});
+
+		$('input[name="background-position-x"]').change(function() {
+			bgImage.css('background-position', $(this).val() + ' top');
+		});
+
+		$('input[name="background-repeat"]').change(function() {
+			bgImage.css('background-repeat', $(this).val());
+		});
+
+		$('#choose-from-library-link').click( function( event ) {
+			var $el = $(this);
+
+			event.preventDefault();
+
+			// If the media frame already exists, reopen it.
+			if ( frame ) {
+				frame.open();
+				return;
+			}
+
+			// Create the media frame.
+			frame = wp.media.frames.customBackground = wp.media({
+				// Set the title of the modal.
+				title: $el.data('choose'),
+
+				// Tell the modal to show only images.
+				library: {
+					type: 'image'
+				},
+
+				// Customize the submit button.
+				button: {
+					// Set the text of the button.
+					text: $el.data('update'),
+					// Tell the button not to close the modal, since we're
+					// going to refresh the page when the image is selected.
+					close: false
+				}
+			});
+
+			// When an image is selected, run a callback.
+			frame.on( 'select', function() {
+				// Grab the selected attachment.
+				var attachment = frame.state().get('selection').first();
+
+				// Run an AJAX request to set the background image.
+				$.post( ajaxurl, {
+					action: 'set-background-image',
+					attachment_id: attachment.id,
+					size: 'full'
+				}).done( function() {
+					// When the request completes, reload the window.
+					window.location.reload();
+				});
+			});
+
+			// Finally, open the modal.
+			frame.open();
+		});
+	});
+})(jQuery);