[09/21] falcon git commit: FALCON-790 Falcon UI to enable entity/process/feed edits and management. Contributed by Armando Reyna/Kenneth Ho

[sr...@apache.org]

http://git-wip-us.apache.org/repos/asf/falcon/blob/c4df0a5e/falcon-ui/app/js/lib/checklist-model.js
----------------------------------------------------------------------
diff --git a/falcon-ui/app/js/lib/checklist-model.js b/falcon-ui/app/js/lib/checklist-model.js
new file mode 100644
index 0000000..0277cc7
--- /dev/null
+++ b/falcon-ui/app/js/lib/checklist-model.js
@@ -0,0 +1,99 @@
+/**
+ * Checklist-model
+ * AngularJS directive for list of checkboxes
+ */
+
+angular.module('checklist-model', [])
+.directive('checklistModel', ['$parse', '$compile', function($parse, $compile) {
+  // contains
+  function contains(arr, item) {
+    if (angular.isArray(arr)) {
+      for (var i = 0; i < arr.length; i++) {
+        if (angular.equals(arr[i], item)) {
+          return true;
+        }
+      }
+    }
+    return false;
+  }
+
+  // add
+  function add(arr, item) {
+    arr = angular.isArray(arr) ? arr : [];
+    for (var i = 0; i < arr.length; i++) {
+      if (angular.equals(arr[i], item)) {
+        return arr;
+      }
+    }    
+    arr.push(item);
+    return arr;
+  }  
+
+  // remove
+  function remove(arr, item) {
+    if (angular.isArray(arr)) {
+      for (var i = 0; i < arr.length; i++) {
+        if (angular.equals(arr[i], item)) {
+          arr.splice(i, 1);
+          break;
+        }
+      }
+    }
+    return arr;
+  }
+
+  // http://stackoverflow.com/a/19228302/1458162
+  function postLinkFn(scope, elem, attrs) {
+    // compile with `ng-model` pointing to `checked`
+    $compile(elem)(scope);
+
+    // getter / setter for original model
+    var getter = $parse(attrs.checklistModel);
+    var setter = getter.assign;
+
+    // value added to list
+    var value = $parse(attrs.checklistValue)(scope.$parent);
+
+    // watch UI checked change
+    scope.$watch('checked', function(newValue, oldValue) {
+      if (newValue === oldValue) { 
+        return;
+      } 
+      var current = getter(scope.$parent);
+      if (newValue === true) {
+        setter(scope.$parent, add(current, value));
+      } else {
+        setter(scope.$parent, remove(current, value));
+      }
+    });
+
+    // watch original model change
+    scope.$parent.$watch(attrs.checklistModel, function(newArr, oldArr) {
+      scope.checked = contains(newArr, value);
+    }, true);
+  }
+
+  return {
+    restrict: 'A',
+    priority: 1000,
+    terminal: true,
+    scope: true,
+    compile: function(tElement, tAttrs) {
+      if (tElement[0].tagName !== 'INPUT' || !tElement.attr('type', 'checkbox')) {
+        throw 'checklist-model should be applied to `input[type="checkbox"]`.';
+      }
+
+      if (!tAttrs.checklistValue) {
+        throw 'You should provide `checklist-value`.';
+      }
+
+      // exclude recursion
+      tElement.removeAttr('checklist-model');
+      
+      // local scope var storing individual checkbox model
+      tElement.attr('ng-model', 'checked');
+
+      return postLinkFn;
+    }
+  };
+}]);
\ No newline at end of file