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wp-content/plugins/advanced-custom-fields-pro/includes/admin/views/upgrade/upgrade.php

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+<?php
+
+/**
+ *  Admin Database Upgrade
+ *
+ *  Shows the databse upgrade process.
+ *
+ *  @date    24/8/18
+ *  @since   5.7.4
+ *  @param   void
+ */
+
+?>
+<style type="text/css">
+	
+	/* hide steps */
+	.step-1,
+	.step-2,
+	.step-3 {
+		display: none;
+	}		
+	
+</style>
+<div id="acf-upgrade-wrap" class="wrap">
+	
+	<h1><?php _e( 'Upgrade Database', 'acf' ); ?></h1>
+	
+<?php if ( acf_has_upgrade() ) : ?>
+
+	<p><?php _e( 'Reading upgrade tasks...', 'acf' ); ?></p>
+	<p class="step-1"><i class="acf-loading"></i> <?php printf( __( 'Upgrading data to version %s', 'acf' ), ACF_VERSION ); ?></p>
+	<p class="step-2"></p>
+	<p class="step-3"><?php printf( __( 'Database upgrade complete. <a href="%s">See what\'s new</a>', 'acf' ), admin_url( 'edit.php?post_type=acf-field-group' ) ); ?></p>
+	
+	<script type="text/javascript">
+	(function($) {
+		
+		var upgrader = new acf.Model({
+			initialize: function(){
+				
+				// allow user to read message for 1 second
+				this.setTimeout( this.upgrade, 1000 );
+			},
+			upgrade: function(){
+				
+				// show step 1
+				$('.step-1').show();
+				
+				// vars
+				var response = '';
+				var success = false;
+				
+				// send ajax request to upgrade DB
+				$.ajax({
+					url: acf.get('ajaxurl'),
+					dataType: 'json',
+					type: 'post',
+					data: acf.prepareForAjax({
+						action: 'acf/ajax/upgrade'
+					}),
+					success: function( json ){
+						success = true;
+					},
+					error: function( jqXHR, textStatus, errorThrown ){
+						response = '<?php _e( 'Upgrade failed.', 'acf' ); ?>';
+						if( error = acf.getXhrError(jqXHR) ) {
+							response += ' <code>' + error +  '</code>';
+						}
+					},
+					complete: this.proxy(function(){
+						
+						// remove spinner
+						$('.acf-loading').hide();
+						
+						// display response
+						if( response ) {
+							$('.step-2').show().html( response );
+						}
+						
+						// display success
+						if( success ) {
+							$('.step-3').show();
+						}
+					})
+				});
+			}
+		});
+				
+	})(jQuery);	
+	</script>
+
+<?php else : ?>
+
+	<p><?php _e( 'No updates available.', 'acf' ); ?></p>
+	
+<?php endif; ?>
+</div>