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问题:

Why in the following example the initial rendered value is {{ person.name }} rather than David? How would you fix this?

Live example here

HTML:

<body ng-controller="MyCtrl">
  <div contenteditable="true" ng-model="person.name">{{ person.name }}</div>
  <pre ng-bind="person.name"></pre>
</body>

JS:

app.controller('MyCtrl', function($scope) {
  $scope.person = {name: 'David'};
});

app.directive('contenteditable', function() {
  return {
    require: 'ngModel',
    link: function(scope, element, attrs, ctrl) {
      // view -> model
      element.bind('blur', function() {
        scope.$apply(function() {
          ctrl.$setViewValue(element.html());
        });
      });

      // model -> view
      ctrl.$render = function() {
        element.html(ctrl.$viewValue);
      };

      // load init value from DOM
      ctrl.$setViewValue(element.html());
    }
  };
});

回答1:

The problem is that you are updating the view value when the interpolation is not finished yet.

So removing

// load init value from DOM
ctrl.$setViewValue(element.html());

or replacing it with

ctrl.$render();

will resolve the issue.

回答2:

Short answer

You're initializing the model from the DOM using this line:

ctrl.$setViewValue(element.html());

You obviously don't need to initialize it from the DOM, since you're setting the value in the controller. Just remove this initialization line.

Long answer (and probably to the different question)

This is actually a known issue: https://github.com/angular/angular.js/issues/528

See an official docs example here

Html:

<!doctype html>
<html ng-app="customControl">
  <head>
    <script src="http://code.angularjs.org/1.2.0-rc.2/angular.min.js"></script>
    <script src="script.js"></script>
  </head>
  <body>
    <form name="myForm">
     <div contenteditable
          name="myWidget" ng-model="userContent"
          strip-br="true"
          required>Change me!</div>
      <span ng-show="myForm.myWidget.$error.required">Required!</span>
     <hr>
     <textarea ng-model="userContent"></textarea>
    </form>
  </body>
</html>

JavaScript:

angular.module('customControl', []).
  directive('contenteditable', function() {
    return {
      restrict: 'A', // only activate on element attribute
      require: '?ngModel', // get a hold of NgModelController
      link: function(scope, element, attrs, ngModel) {
        if(!ngModel) return; // do nothing if no ng-model

        // Specify how UI should be updated
        ngModel.$render = function() {
          element.html(ngModel.$viewValue || '');
        };

        // Listen for change events to enable binding
        element.on('blur keyup change', function() {
          scope.$apply(read);
        });
        read(); // initialize

        // Write data to the model
        function read() {
          var html = element.html();
          // When we clear the content editable the browser leaves a <br> behind
          // If strip-br attribute is provided then we strip this out
          if( attrs.stripBr && html == '<br>' ) {
            html = '';
          }
          ngModel.$setViewValue(html);
        }
      }
    };
  });

Plunkr

回答3:

Here is my understanding of Custom directives.

The code below is basic overview of two way binding.

you can see it working here as well.

http://plnkr.co/edit/8dhZw5W1JyPFUiY7sXjo

<!doctype html>
<html ng-app="customCtrl">
  <head>
    <script src="http://code.angularjs.org/1.2.0-rc.2/angular.min.js"></script>
    <script>

  angular.module("customCtrl", []) //[] for setter
  .directive("contenteditable", function () {

    return {
      restrict: "A",  //A for Attribute, E for Element, C for Class & M for comment
      require: "ngModel",  //requiring ngModel to bind 2 ways.
      link: linkFunc
    }
    //----------------------------------------------------------------------//
    function linkFunc(scope, element, attributes,ngModelController) {
        // From Html to View Model
        // Attaching an event handler to trigger the View Model Update.
        // Using scope.$apply to update View Model with a function as an
        // argument that takes Value from the Html Page and update it on View Model
        element.on("keyup blur change", function () {
          scope.$apply(updateViewModel)
        })

        function updateViewModel() {
          var htmlValue = element.text()
          ngModelController.$setViewValue(htmlValue)
        }
              // from View Model to Html
              // render method of Model Controller takes a function defining how
              // to update the Html. Function gets the current value in the View Model
              // with $viewValue property of Model Controller and I used element text method
              // to update the Html just as we do in normal jQuery.
              ngModelController.$render = updateHtml

              function updateHtml() {
                var viewModelValue = ngModelController.$viewValue
                // if viewModelValue is change internally, and if it is
                // undefined, it won't update the html. That's why "" is used.
                viewModelValue = viewModelValue ? viewModelValue : ""
                element.text(viewModelValue)
              }
    // General Notes:- ngModelController is a connection between backend View Model and the 
    // front end Html. So we can use $viewValue and $setViewValue property to view backend
    // value and set backend value. For taking and setting Frontend Html Value, Element would suffice.

    }
  })

    </script>
  </head>
  <body>
    <form name="myForm">
    <label>Enter some text!!</label>
     <div contenteditable
          name="myWidget" ng-model="userContent"
          style="border: 1px solid lightgrey"></div>
     <hr>
     <textarea placeholder="Enter some text!!" ng-model="userContent"></textarea>
    </form>
  </body>
</html>

Hope, it helps someone out there.!!

回答4:

Check this angularjs directive https://github.com/clofus/angular-inputnlabel http://clofus.com/viewarticles/109

回答5:

You may run into issues using @Vanaun's code if a scope.$apply is already in progress. In this case I use $timeout instead which resolves the issue:

Html:

<!doctype html>
<html ng-app="customControl">
  <head>
    <script src="http://code.angularjs.org/1.2.0-rc.2/angular.min.js"></script>
    <script src="script.js"></script>
  </head>
  <body>
    <form name="myForm">
     <div contenteditable
          name="myWidget" ng-model="userContent"
          strip-br="true"
          required>Change me!</div>
      <span ng-show="myForm.myWidget.$error.required">Required!</span>
     <hr>
     <textarea ng-model="userContent"></textarea>
    </form>
  </body>
</html>

JavaScript:

angular.module('customControl', []).
  directive('contenteditable', function($timeout) {
    return {
      restrict: 'A', // only activate on element attribute
      require: '?ngModel', // get a hold of NgModelController
      link: function(scope, element, attrs, ngModel) {
        if(!ngModel) return; // do nothing if no ng-model

        // Specify how UI should be updated
        ngModel.$render = function() {
          element.html(ngModel.$viewValue || '');
        };

        // Listen for change events to enable binding
        element.on('blur keyup change', function() {
          $timeout(read);
        });
        read(); // initialize

        // Write data to the model
        function read() {
          var html = element.html();
          // When we clear the content editable the browser leaves a <br> behind
          // If strip-br attribute is provided then we strip this out
          if( attrs.stripBr && html == '<br>' ) {
            html = '';
          }
          ngModel.$setViewValue(html);
        }
      }
    };
  });

Working Example: Plunkr