Understanding Angular's transclusion functionality and how it interacts with scopes

I've been working on creating a directive for click-to-edit input fields. My goal was to make it an attribute type directive that can work with various types of input fields by simply transcluding the input field itself.

However, I've encountered a problem when using a scope parameter in the directive description (for ipDisable). It seems like things stop functioning properly when this parameter is added (you can try commenting in line 44 in the jsFiddle JS part). It appears to be a scope error, but I'm unsure where to start debugging it. Any guidance or assistance would be greatly appreciated.

jsFiddle: http://jsfiddle.net/HbYwX/3/

HTML:

<input inplace type="string" ip-disable=false name="username" ng-model="uname">

JS:

myApp.directive('inplace', function($compile) {

var compile = function(tElem,tAttrib,transclude) {

  var whole = $('<div ng-scope></div>');

  var editable = $('<div class="editable-transclude" ng-hide="static">'+
                  '<a ng-click="changeStatic()" ng-show="!static && !disable()">'+
                  '&ltsave&gt</a></div>');

  whole.append(editable).append('<span class="disabledText" ng-show="static">{{ngModel.$viewValue}}</span>' +
            '<a ng-click="changeStatic()" ng-show="static && !disable()">'+
            '&ltedit&gt</a>');

  tElem.replaceWith(whole);

  transclude(tElem,function(clone) {
    clone.removeAttr('inplace');
    editable.prepend(clone);
  });  

  return function(scope, element, attrs) {  

    var input_element = $($(element).find('input')[0]);
    scope.name = input_element.name;
    scope.ngModel = element.controller('ngModel');

    scope.static = true;

    scope.changeStatic = function() {
      if (scope.static) {
        scope.static = false;
      } else if (!scope.ngModel.$error[scope.name]){
        scope.static = true;
      }
    };
  };
};

return {
  transclude: 'element',
  scope: { disable: '&ipDisable' },
  restrict: 'A',
  compile: compile
};  
});

Answer №1

The reason for this issue is due to the fact that you are moving the input element into an element with an isolate scope, causing it to lose connection with the outer scope. Consequently, the uname variable bound to will not share the same scope as the one being used in the ng-model of the input.

There are a couple of solutions available to resolve this issue - firstly, you can choose not to create an isolate scope at all and still access ipDisable using attrs within your link function.

Alternatively, a better solution would be to include ngModel in the isolate scope (

scope: { disable: '&ipDisable', ngModel:'='}
), and manually update the input value by utilizing the ngModelController when a change occurs in the input.

Answer №2

After encountering a problem, Ed provided a solution that resolved part of the issue. However, there was another obstacle that initially caused confusion:

The template ended up being compiled into the parent scope instead of being attached to the new directive scope. To rectify this, manual compilation of the created template in the linker function was necessary in order to properly bind it to the correct scope.

You can view the working solution here: http://jsfiddle.net/HbYwX/5/

 myApp.directive('inplace', function($compile) {

var compile = function(tElem,tAttrib,transclude) {

  var whole = $('<div ng-scope></div>');

    var editable = $('<div class="editable-transclude" ng-hide="static">'+
                  '<a ng-click="changeStatic()" ng-show="!static && ipDisable()">'+
                  '&ltsave&gt</a></div>');

  transclude(tElem,function(clone) {
    clone.removeAttr('inplace');
    clone.attr('ng-model','model');
    editable.prepend(clone);
  });

  whole.append(editable).append('<span class="disabledText" ng-show="static">{{model}}</span>' +
            '<a ng-click="changeStatic()" ng-show="static && !ipDisable()">'+
            '&ltedit&gt</a>');


  return function(scope, element, attrs) {

    element.replaceWith($compile(whole)(scope));

    scope.name = attrs.name;

    scope.static = true;

    scope.changeStatic = function() {
      if (scope.static) {
        scope.static = false;
      } else {
        scope.static = true;
        if (scope.name) scope.$emit('inplace-edit',scope.name);
      }
    };
  };
};

return {
  transclude: 'element',
  scope: { ipDisable: '&', model: '=' },
  restrict: 'A',
  compile: compile
};  
});

(This solution may be helpful for those seeking similar functionalities and is provided under an MIT license allowing you to utilize it as needed).

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