Adding hooks for 'beforeNext' and 'beforeBack'

Author: clocklear

.gitignore

@@ -0,0 +1 @@
+.idea/

README.md

@@ -27,7 +27,9 @@ The plugin accepts options as a single object argument. Supported options are:
 * **backType** HTML input type for back button (default: "reset")
 * **nextClasses** class(es) for next button (default: "btn btn-primary")
 * **backClasses** class(es) for back button (default: "btn")
+* **beforeNext** function to call before next step (allowing for validation -- return false to prevent next)
 * **onNext** function to call on next step
+* **beforeBack** function to call before back step (allowing for validation -- return false to prevent back)
 * **onBack** function to call on back up
 * **onInit** a chance to hook initialization
 * **onDestroy** a chance to hook destruction

src/acc-wizard.js

@@ -232,26 +232,32 @@
                     .click(function(ev) {
                         ev.preventDefault();
                         var panel = $(this).parents(".accordion-body")[0];
-                        var next = "#" + $(".accordion-body",
-                               $(panel).parents(".accordion-group")
-                               .next(".accordion-group")[0])[0].id;
-                        $(next).collapse("show");
-                        hook('onNext', panel);
+                        var resp = hook('beforeNext', panel);
+                        if(resp) {
+                            var next = "#" + $(".accordion-body",
+                                $(panel).parents(".accordion-group")
+                                    .next(".accordion-group")[0])[0].id;
+                            $(next).collapse("show");
+                            hook('onNext', panel);
+                        }
                     });
-            
+
                 // When the user clicks the "Back" button in
                 // any panel, retrurn to the previous panel.
-            
+
                 $("."+options.stepClass,$el)
                     .children("button[type='"+options.backType+"']")
                     .click(function(ev) {
                         ev.preventDefault();
                         var panel = $(this).parents(".accordion-body")[0];
-                        var prev = "#" + $(".accordion-body",
-                                       $(panel).parents(".accordion-group")
-                                       .prev(".accordion-group")[0])[0].id;
-                        $(prev).collapse("show");
-                        hook('onPrev', panel);
+                        var resp = hook('beforeBack', panel);
+                        if(resp) {
+                            var prev = "#" + $(".accordion-body",
+                                $(panel).parents(".accordion-group")
+                                    .prev(".accordion-group")[0])[0].id;
+                            $(prev).collapse("show");
+                            hook('onPrev', panel);
+                        }
                     });
             }
 
@@ -282,14 +288,14 @@
         // hookName: function() {}
         // Then somewhere in the plugin trigger the callback:
         // hook('hookName');
-				
+
         function hook(hookName) {
             if (options[hookName] !== undefined) {
                 // Call the user defined function.
                 // Scope is set to the jQuery element we are operating on.
                 var fn = options[hookName];
                 arguments[0] = el;
-                fn.apply(this, arguments);
+                return fn.apply(this, arguments);
             }
         }