New feature: allow adding of multiple rows by clicking on a specified button

src/jquery.formset.js

@@ -9,6 +9,7 @@
  * Licensed under the New BSD License
  * See: http://www.opensource.org/licenses/bsd-license.php
  */
+
 ;(function($) {
     $.fn.formset = function(opts)
     {
@@ -211,6 +212,43 @@
             });
         }
 
+        // adding multiple rows bindings
+        if (options.addMultRows) {
+            var addMultRowsButton = options.addMultRows.button;
+            var addMultRowsFunction = options.addMultRows.function;
+            var addMultRowsPostFunction = options.addMultRows.post_function;
+            var currentDataRow = undefined;
+
+            // we got the data & insert a row for every element on it
+            addMultRowsButton.click(function () {
+                var url = addMultRowsFunction();
+                // we got the data of the group agentes
+                $.get(url).done(function(data) {
+                    data.forEach(function (elem) {
+                        currentDataRow = elem;
+                        addButton.click();
+                        currentDataRow = undefined;
+                    });
+                    if (addMultRowsPostFunction) {
+                        addMultRowsPostFunction(data);
+                    }
+                });
+            });
+
+            // add row_data to the row to allow customize row values
+            // decorating 'added' callback
+            var previousAdded = options.added;
+            options.added = function (row) {
+                if (currentDataRow) {
+                    row.attr('data', JSON.stringify(currentDataRow));
+                }
+                if (previousAdded) {
+                    // in 'added' callback you can use the data in the row
+                    previousAdded(row);
+                }
+            };
+        }
+
         return $$;
     };
 
@@ -226,6 +264,13 @@
         extraClasses: [],                // Additional CSS classes, which will be applied to each form in turn
         keepFieldValues: '',             // jQuery selector for fields whose values should be kept when the form is cloned
         added: null,                     // Function called each time a new form is added
-        removed: null                    // Function called each time a form is deleted
+        removed: null,                   // Function called each time a form is deleted
+        addMultRows: null                // Button for add multiple rows programatically and function for assigns data to it
+        // The function should return an url that can be accesed using GET, and then it use the generated data to add
+        // to each row. Note that the url returned by the function can be fixed or not, in order to add more flexibility
+        // obtaining data sources.
+        // The data returned by the API should be a list of JS objects and also can be passed to another callback option called
+        // 'post_function' that would be call when data sources has been obtained and new data rows were created.
+        // For example addMultRows: {'button': $('#mybutton'), 'function': function() {return 'https://restcountries.eu/rest/v2/all'}, 'post_function': function(data) {console.log(data);}}
     };
 })(jQuery);