如何在 md-select inside 指令中绑定到多个 [英] How to bind to multiple in md-select inside directive

问题描述

尝试创建一个简单的指令，根据是否为范围上的 model 属性传递数组来显示文本框或下拉列表.

除了在指令标记中显式设置 false 之外的任何事情，例如 multiple="false"，都会导致多选下拉列表.

为什么这不起作用?此外，md-select 值绑定不起作用(尽管文本框绑定起作用)，我怀疑出于同样的原因.

Plunkr 可在此处说明问题

消费者

<content-filter ng-repeat="filter in filters" flex="filter.width" model="filter.model" value="filter.value"></content-filter>

消费者控制器

app.controller('MainCtrl', function($scope){$scope.filters =[{模型:{多选:假，项目:[{标签:'全部'，价值:'全部'},{标签:'失败',值:'失败'},{标签:'成功',价值:'成功'}]},价值:'全部'，宽度:'50%'},{值:'123'，宽度:'50%'}];});

指令

app.directive('contentFilter', function(){返回 {限制:'E'，替换:假，模板: '\<md-input-container flex layout="fill" ng-if="model &&model.items.length">\<md-select ng-model="value" multiple="model.multiSelect === true">\<md-option ng-repeat="item in model.items" ng-value="{{ item.value }}">{{ item.label }}</md-option>\</md-选择>\</md-input-container>\<md-input-container flex layout="fill" ng-if="!model">\<input type="text" aria-label="{{ label }}" ng-model="value"/>\</md-input-container>',范围:{值:'='，型号:'=?'}};});

解决方案

可能这不是您要找的答案...

我尝试将多个属性有条件地设置为 md-select，但似乎没有任何效果(ng-attr-multiple、ng-multiple...).可能是角度材质的错误.

因此，作为一种解决方法，您可以根据属性 model.multiSelect 值有条件地添加两个 md-select:一个具有多个属性，另一个没有它.示例:

重要提示:请记住，如果 md-select 是多个，则绑定的值需要是一个数组，因此您必须更改 ng-model="value" 每个 ng-model="[value]"，正如您在前面的代码中看到的那样.

<块引用>

我已经分叉了你的 plunker，你可以在这里看到一个工作示例

希望有帮助.无论如何，我会等待其他答案.

Trying to create a simple directive that shows a textbox or dropdown depending on whether an array is passed for a model property on the scope.

Anything except explicitly setting false in the directive markup e.g., multiple="false", results in a multi-select dropdown.

Why is this not working? Also, md-select value binding is not working (although textbox binding is working), I suspect for the same reason.

Plunkr available here illustrating the issue

Consumer

<div ng-app='home' layout-padding layout="row">
  <content-filter ng-repeat="filter in filters" flex="filter.width" model="filter.model" value="filter.value"></content-filter>
</div>

Consumer Controller

app.controller('MainCtrl', function($scope) 
{
  $scope.filters = 
  [
    {
      model: 
      {
       multiSelect: false,
        items: 
        [
          {
            label: 'All',
            value: 'all'
          }, 
          {
            label: 'Fail',
            value: 'fail'
          }, 
          {
            label: 'Success',
            value: 'success'
          }
        ]
      },
      value: 'all',
      width: '50%'
    }, 
    {
      value: '123',
      width: '50%'
    }
  ];
 });

Directive

app.directive('contentFilter', function() 
{
  return {
    restrict: 'E',
    replace: false,
    template: '\
      <md-input-container flex layout="fill" ng-if="model && model.items.length">\
        <md-select ng-model="value" multiple="model.multiSelect === true">\
         <md-option ng-repeat="item in model.items" ng-value="{{ item.value }}">{{ item.label }}</md-option>\
        </md-select>\
      </md-input-container>\
      <md-input-container flex layout="fill" ng-if="!model">\
        <input type="text" aria-label="{{ label }}" ng-model="value" />\
      </md-input-container>',
    scope: 
    {
      value: '=',      
      model: '=?'
    }
  };
});

解决方案

Probably this is not the answer you are looking for...

I've tried to conditionally set multiple attribute to md-select and nothing seems to be work (ng-attr-multiple, ng-multiple...). Probably it's an angular-material bug.

So, as a workaround, you could conditionally add two md-selects, depending on the atribute model.multiSelect value: one with multiple attribute and the other one without it. Example:

<md-input-container flex layout="fill" ng-if="model && !model.multiSelect && model.items.length">\
    <md-select ng-model="value">\
     <md-option ng-repeat="item in model.items" value="{{ item.value }}">{{ item.label }}</md-option>\
    </md-select>\
</md-input-container>\
<md-input-container flex layout="fill" ng-if="model && model.multiSelect && model.items.length">\
    <md-select ng-model="[value]" multiple>\
     <md-option ng-repeat="item in model.items" value="{{ item.value }}">{{ item.label }}</md-option>\
    </md-select>\
</md-input-container>\

IMPORTANT: Keep in mind that if the md-select is multiple, the value binded needs to be an array, so you will have to change ng-model="value" per ng-model="[value]", as you can see in the previous code.

I've forked your plunker and you can see a working example here

Hope it helps. Anyway, I'll be waiting for other answers.

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