plugin install

wp/wp-content/plugins/gravityforms/js/duplicate-submissions.js

@@ -0,0 +1,115 @@
+/**
+ * Provides functionality to allow browsers to re-submit forms without creating duplicate submissions.
+ */
+(function() {
+
+	var config = window.gf_duplicate_submissions || {};
+
+	/**
+	 * Check if the current browser is Safari.
+	 *
+	 * @returns {boolean}
+	 */
+	var isSafari = function() {
+		var ua                  = window.navigator.userAgent;
+		var iOS                 = !!ua.match( /iP(ad|od|hone)/i );
+		var hasSafariInUa       = !!ua.match( /Safari/i );
+		var noOtherBrowsersInUa = !ua.match( /Chrome|CriOS|OPiOS|mercury|FxiOS|Firefox/i )
+		var result              = false;
+
+		if ( iOS ) { //detecting Safari in IOS mobile browsers
+			var webkit = !!ua.match( /WebKit/i );
+			result     = webkit && hasSafariInUa && noOtherBrowsersInUa;
+		} else if ( window.safari !== undefined ) { //detecting Safari in Desktop Browsers
+			result = true;
+		} else { // detecting Safari in other platforms
+			result = hasSafariInUa && noOtherBrowsersInUa;
+		}
+
+		return result;
+	};
+
+	/**
+	 * Update a Query Var based on the provided key/value.
+	 *
+	 * @param {string} key   The key to update.
+	 * @param {string} value The value to which the key should be updated.
+	 * @param {string} url   The URL to update.
+	 *
+	 * @returns {string}
+	 */
+	var updateQueryVar = function( key, value, url ) {
+		var separator = '?';
+
+		var hashSplit  = url.split( '#' ),
+		    hash       = hashSplit[ 1 ] ? '#' + hashSplit[ 1 ] : '',
+		    querySplit = hashSplit[ 0 ].split( '?' ),
+		    host       = querySplit[ 0 ],
+		    query      = querySplit[ 1 ],
+		    params     = query !== undefined ? query.split( '&' ) : [],
+		    updated    = false;
+
+		for ( var index = 0; index < params.length; index++ ) {
+			var item = params[ index ];
+
+			// No need to process this parameter since it doesn't match the one we're updating.
+			if ( ! item.startsWith( key + '=' ) ) {
+				continue;
+			}
+
+			// Update the param if the value is non-empty, otherwise remove it.
+			if ( value.length > 0 ) {
+				params[ index ] = key + '=' + value;
+			} else {
+				params.splice( index, 1 );
+			}
+
+			updated = true;
+		}
+
+		// Param didn't already exist; if the value is non-empty, add it to the param array.
+		if ( ! updated && value.length > 0 ) {
+			params[ params.length ] = key + '=' + value;
+		}
+
+		var queryString = params.join( '&' );
+
+		return host + separator + queryString + hash;
+	};
+
+	/**
+	 * Get the properly-formatted URL for redirects.
+	 *
+	 * @returns {string}
+	 */
+	var getFormattedURL = function() {
+		var baseUrl = updateQueryVar( config.safari_redirect_param, '', window.location.href );
+		var safariUrl = updateQueryVar( config.safari_redirect_param, '1', window.location.href );
+
+		console.log( baseUrl, safariUrl );
+
+		return isSafari() ? safariUrl : baseUrl;
+	};
+
+	/**
+	 * Replace the current history state to avoid duplicate submissions.
+	 */
+	var handleReplaceState = function() {
+		window.history.replaceState( null, null, getFormattedURL() );
+	};
+
+	/**
+	 * Initialize.
+	 */
+	var init = function() {
+		if ( window.gf_duplicate_submissions_initialized || config.is_gf_submission !== '1' || !window.history.replaceState ) {
+			return;
+		}
+
+		window.gf_duplicate_submissions_initialized = true;
+
+		handleReplaceState();
+	};
+
+	init();
+})();