对ng-model满意是不行的

Question

我正在尝试将a的值存储contenteditable到我的JS代码中.但我无法找出为什么ng-model在这种情况下不起作用.

<div ng-app="Demo" ng-controller="main">
    <input ng-model="inputValue"></input>
    <div>{{inputValue}}</div> // Works fine with an input
    <hr/>
    <div contenteditable="true" ng-model="contentValue"></div>
    <div>{{contentValue}}</div> // Doesn't work with a contenteditable
</div>

有没有办法解决这个问题？

请参阅:JSFiddle

注意:我正在创建一个文本编辑器,因此用户应该看到结果,而我将HTML存储在其后面.(即用户看到:"这是一个例子!",同时我店:This is an <b>example</b> !)

Answer 1

contenteditable标签不能直接使用angular的ng-model,因为contenteditable的方式会在每次更改时重新呈现dom元素.

你必须用它的自定义指令包装它:

JS:

angular.module('customControl', ['ngSanitize']).
directive('contenteditable', ['$sce', function($sce) {
  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.$render = function() {
        element.html($sce.getTrustedHtml(ngModel.$viewValue || ''));
      };

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

HTML

<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>

从原始文档中获取它

Answer 2

只需将read函数调用移动到$ render即可

angular.module('customControl', ['ngSanitize']).
directive('contenteditable', ['$sce', function($sce) {
  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.$render = function() {
        element.html($sce.getTrustedHtml(ngModel.$viewValue || ''));
        read(); // initialize
      };

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

      // 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);
      }
    }
  };
}]);