我想设置上是在指令调用中使用数据属性一些文本：

 ＆LT; TextArea类=PageDown键管理员wmd- ​​preVIEW-23   数据模式=莫代尔   数据下页管理员   数据-NG-模式=answer.text   数据PID =answer.answerId   数据字段={{'modal.data.answers ['+ $指数+']的.text'}}   ID =模态数据回答 -  {{$指数}}＆GT;＆LT; / textarea的＆GT; 

它给语法错误，不管我怎么努力。没有人有任何想法可能是错误的？我想在一个字段名传递与来自AngularJS NG重复内的数组索引值

  app.directive（'pagedownAdmin'，函数（$编译）{    变种nextId = 0;    VAR markdownConverter =新Markdown.Converter（）;    变种converter1 = Markdown.getSanitizingConverter（）;    converter1.hooks.chain（preBlockGamut功能（文字，RBG）{        返回text.replace（/ ^ {0,3}* \ N（（？：？* \ N）+）{0,3}* $ /克，功能（全，内） {            返回＆LT;＆BLOCKQUOTE GT; + RBG（内）+＆LT; / BLOCKQUOTE＆GT; \ N的;        }）;    }）;    返回{        要求：'ngModel'，        更换：真实，        范围： {            现场：'=场'，            模态：'=模态'，            PID：'= PID        }，        模板：'＆LT; D​​IV CLASS =PageDown键，引导编辑器＆GT;＆LT; / DIV＆GT;，        链接：功能（范围，元素，ATTRS，ngModel）{ 

后来在我的指导我有：

  $范围的eval（attrs.field +=+ rawContent）。            。范围$适用（）; 

然而，它似乎并没有得到做$ EVAL它给人的错误之前的点。

这里的语法错误：

 错误：[$解析：语法] http://errors.angularjs.org/1.2.3/$parse/syntax?p0='modal.data.answers%5B'&…7D%7D&p4='modal.data.answers%5B'%20%2B%20%24index%20%2B%20'%5D.text'%7D%7D    在错误（小于匿名＆GT;）    在http://127.0.0.1:81/Scripts/angular-v1.2.3/angular.min.js:6:449 

解决方案

下面是一个例如

你应该把它写像这样：

 ＆LT; textarea的数据字段={{modal.data.answers [$指数]的.text}}＆GT; 

但你也应该使用文字绑定语法（ @ ），而不是在双向绑定语法 （ = ）参考父范围的领域时：

范围：{  现场：'@'，}，

在短，@语法支持插值而=语法不！

您一定要阅读：What在指令范围内的'@'和'='区别

我总是喜欢在可能的时候显示源$ C ​​$ C：

在 compile.js 有一个 nodeLinkFn 函数，在里面你可以看到这些情况：

 情况下，@：  ATTRS。$观察（attrName，功能（价值）{    isolateScope [scopeName] =价值;  }）;  。ATTRS $$观察家[attrName] $$范围=范围;  如果（ATTRS [attrName]）{    //如果属性已经提供那么我们触发插值保证    //值是那里的链接使用FN    isolateScope [scopeName] = $插补（ATTRS [attrName]）（范围）;  }  打破;情况下=：  // ......一些code在这里  isolateScope。$腕表（功能parentValueWatch（）{    // ......一些code在这里  }，空，parentGet.literal）;  打破; 

摘要：

当使用'@'语法角度使用 $观察（内部使用的 $插值和 $看）当使用=语法角度使用 $手表，它不支持插值。 Difference观察员和看守之间

I am trying to set some text on a data attribute that is used in a directive call:

<textarea class="pagedown-admin wmd-preview-23"
   data-modal="modal"
   data-pagedown-admin
   data-ng-model="answer.text"
   data-pid="answer.answerId"
   data-field="{{'modal.data.answers[' + $index + '].text'}}"
   id="modal-data-answer-{{$index}}"></textarea>

It's giving syntax errors no matter what I try. Does anyone have any idea what could be wrong? I want to pass in a field name with an array index value from inside an AngularJS ng-repeat.

app.directive('pagedownAdmin', function ($compile) {
    var nextId = 0;
    var markdownConverter = new Markdown.Converter();
    var converter1 = Markdown.getSanitizingConverter();

    converter1.hooks.chain("preBlockGamut", function (text, rbg) {
        return text.replace(/^ {0,3}""" *n((?:.*?n)+?) {0,3}""" *$/gm, function (whole, inner) {
            return "<blockquote>" + rbg(inner) + "</blockquote>n";
        });
    });

    return {
        require: 'ngModel',
        replace: true,
        scope: {
            field: '=field',
            modal: '=modal',
            pid: '=pid'
        },
        template: '<div class="pagedown-bootstrap-editor"></div>',
        link: function (scope, element, attrs, ngModel) {

Later in my directive I have:

            scope.$eval(attrs.field + "=" + rawContent);
            scope.$apply();

However it does not appear to get to the point of doing the $eval before it gives the error.

Here's the syntax error:

Error: [$parse:syntax] http://errors.angularjs.org/1.2.3/$parse/syntax?p0='modal.data.answers%5B'&…7D%7D&p4='modal.data.answers%5B'%20%2B%20%24index%20%2B%20'%5D.text'%7D%7D
    at Error (<anonymous>)
    at http://127.0.0.1:81/Scripts/angular-v1.2.3/angular.min.js:6:449

解决方案

Here is an example

You should write it like so:

<textarea data-field="{{modal.data.answers[$index].text}}" >

But you should also use the Text Binding syntax (@) rather than the Two-way Binding syntax (=) when referring to field of parent scope:

scope: {
  field: '@',            
},

In short, "@" syntax supports interpolation while "=" syntax doesn't!

You should definitely read this: What is the difference between '@' and '=' in directive scope

I always like to show the source code when possible:

In compile.js there is a nodeLinkFn function, Inside you can see these cases:

case '@':
  attrs.$observe(attrName, function(value) {
    isolateScope[scopeName] = value;
  });
  attrs.$$observers[attrName].$$scope = scope;
  if( attrs[attrName] ) {
    // If the attribute has been provided then we trigger an interpolation to ensure
    // the value is there for use in the link fn
    isolateScope[scopeName] = $interpolate(attrs[attrName])(scope);
  }
  break;

case '=':

  // ....... some code here

  isolateScope.$watch(function parentValueWatch() {

    //...... some code here

  }, null, parentGet.literal);
  break;

Summary :

when using '@' syntax angular uses $observe (which internally uses $interpolate and $watch) when using '=' syntax angular uses $watch, which does not support interpolations. Difference Between Observers and Watchers