AngularJS/材质:为什么不对表达式求值? [英] AngularJS / Material: why the expression is not evaluated?
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问题描述
我不明白为什么在此代码中不对表达式"{{isMultiple}}"进行求值:
I do not understand why the expression "{{isMultiple}}" is not evaluated in this code:
HTML:
<md-input-container style="width: 30%;">
<label>{{label}}</label>
<md-select ng-model="choice" multiple="{{isMultiple}}">
<md-option value="1">Option 1</md-option>
<md-option value="2">Option 2</md-option>
<md-option value="3">Option 3</md-option>
</md-select>
</md-input-container>
JS:
angular.module('app', ['ngMaterial'])
.controller('AppCtrl', AppCtrl);
function AppCtrl($scope) {
$scope.isMultiple = false;
$scope.choice = "";
$scope.label = "MyLabel";
}
Plunker上的完整代码: https://plnkr.co/edit/a5yCLW?p=preview
Full code on Plunker: https://plnkr.co/edit/a5yCLW?p=preview
在此示例中,下拉控件不应是多选的.
The Dropdown control should NOT be multi-selectable in this example.
推荐答案
It is not possible to pass an expression to the attribute multiple
, according to the documentation:
However, one way around this is to create the md-select
in the code - CodePen
标记
<div ng-controller="AppCtrl" ng-cloak="" ng-app="MyApp">
<md-input-container id="myInputContainer" style="width: 30%;">
<label>{{label}}</label>
</md-input-container>
</div>
JS
angular.module('MyApp',['ngMaterial', 'ngMessages', 'material.svgAssetsCache', 'ngDialog'])
.controller('AppCtrl', function($scope, $element, $compile) {
var myInputContainer = angular.element($element[0].querySelector('#myInputContainer')),
mdSelect,
mdSelectElement;
$scope.options = [
{value: 1, label: "Option 1"},
{value: 2, label: "Option 2"},
{value: 3, label: "Option 3"}
]
$scope.isMultiple = false;
$scope.choice = "";
$scope.label = "MyLabel";
mdSelect = "<md-select ng-model='choice' multiple='" + $scope.isMultiple + "'>" +
"<md-option ng-repeat='option in options' value='{{option.value}}'>{{option.label}}</md-option>" +
"</md-select>";
mdSelectElement = angular.element(mdSelect);
myInputContainer.append(mdSelectElement);
$compile(myInputContainer)($scope);
});
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