ng-model does not bind within ng-repeat, while eve

2019-08-17 08:16发布

站内问答 / JavaScript
1954 2 6

I know there are a ton of questions already on this topic, I tried the solutions I found but it doesnt seem to work. Basically I have this directive called basicMunch that goes through an array of objects and creates some html. Everything works nicely and bind other than the ng-modal Here is the code for the directive: 

>     munches.directive('basicmunches', function() {   return {
>     require: 'ngModel',
>     template:`<div class='columns'>  <div ng-repeat="mu in basicMunches" class="card column col-4 col-sm-12">
>           <div class="card-header">
>             <h4 class="card-title">{{mu.name}}</h4>
>             <h6 class="card-subtitle">{{mu.type}}</h6>
>           </div>
>           <div class="card-body">
>             {{mu.text}}
>           </div>
>           <div class="card-footer">
>             <div class="form-group">
>               <label class="form-switch">
>                 <input ng-model="mu.tag" name="{{mu.tag}}"  type="checkbox" />
>                 <i class="form-icon"></i> Turn On
>               </label>
>             </div>
>           </div>
>         </div></div>`   } });

Here is the array: 

 $scope.basicMunches  = [
    {"name":"The New York TImes",
     "text":"Get the top headlines from the NYT every morning", 
     "type":"News", "tag":"nyt"
    },
    {"name":"Wall Street Journal",
     "text":"Get the top headlines from the WSJ every morning", 
     "type":"News", "tag":"wsj"
    }
];

Here is what i see in the console enter image description here

I have tried doing $parent.mu.tag and $parent.$parent.mu.tag, but that didnt work as it shouldnt have because it isnt nested in some other scope (atleast not that I know of)

I tried doing the name of the controller.mu.tag, that too doesnt work

I tried doing mu['tag'] and that doesnt work either

I tried using {{ and that doesnt work I changed it to ng-bind={{mu.tag}} and that does work It is weird to me that it works for ng-bind but it doesnt work for ng-model.... Anyhow, anyone have any ideas?

2条回答
等我变得足够好
2楼-- · 2019-08-17 08:47

It seems like what you are wanting is to bind the ng-model property to the value of mu.tag, rather than to mu.tag itself.

Due to the way that ng-model is parsed, you need to use a variation of the bracket syntax in order to make this possible. The proper syntax here is $parent[mu.tag] which will look on the $parent object for the property named by the value of mu.tag. The parent of the ng-repeat is $scope, so this ends up with the property on the correct object.

<input ng-model="$parent[mu.tag]" name="{{mu.tag}}"  type="checkbox" />

http://plnkr.co/edit/RZNDa2XVUoZp1z7QeN46?p=preview

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放我归山
3楼-- · 2019-08-17 08:51

Have the checkbox inputs fill properties of an object with property accessor bracket notation:

<fieldset ng-repeat="mu in munchies">
    <input ng-model="choices[mu.tag]" name="{{mu.tag}}"
             type="checkbox" />
      &nbsp;  Turn On
</fieldset>

The DEMO

angular.module("app",[])
.controller("ctrl",function($scope) {
  var vm = $scope;
  vm.choices = {};
  vm.munchies  = [
    {"name":"The New York TImes",
     "text":"Get the top headlines from the NYT every morning", 
     "type":"News", "tag":"nyt"
    },
    {"name":"Wall Street Journal",
     "text":"Get the top headlines from the WSJ every morning", 
     "type":"News", "tag":"wsj"
    }
  ];
})
<script src="//unpkg.com/angular/angular.js"></script>
  <body ng-app="app" ng-controller="ctrl">
    Subscriptions {{choices | json}}
    <fieldset ng-repeat="mu in munchies">
      <h3>{{mu.name}}</h3>
      <p>{{mu.text}}</p>
      <input ng-model="choices[mu.tag]" name="{{mu.tag}}"
                 type="checkbox" />
          &nbsp;  Turn On
      <br/>Subscribed {{choices[mu.tag]}}
    </fieldset>
  </body>

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