AngularJS/Material:为什么不评估表达式? [英] AngularJS / Material: why the expression is not evaluated?
本文介绍了AngularJS/Material:为什么不评估表达式?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我不明白为什么在这段代码中没有计算表达式{{isMultiple}}":
HTML:
<label>{{label}}</label><md-select ng-model="choice" multiple="{{isMultiple}}"><md-option value="1">选项1</md-option><md-option value="2">选项2</md-option><md-option value="3">选项3</md-option></md-选择></md-input-container>
JS:
angular.module('app', ['ngMaterial']).controller('AppCtrl', AppCtrl);功能 AppCtrl($scope) {$scope.isMultiple = false;$scope.choice = "";$scope.label = "MyLabel";}
Plunker 上的完整代码:
但是,解决此问题的一种方法是在代码中创建 md-select
- CodePen
标记
<md-input-container id="myInputContainer" style="width: 30%;"><label>{{label}}</label></md-input-container>
JS
angular.module('MyApp',['ngMaterial', 'ngMessages', 'material.svgAssetsCache', 'ngDialog']).controller('AppCtrl', function($scope, $element, $compile) {var myInputContainer = angular.element($element[0].querySelector('#myInputContainer')),选择,mdSelectElement;$scope.options = [{值:1,标签:选项1"},{值:2,标签:选项2"},{值:3,标签:选项3"}]$scope.isMultiple = false;$scope.choice = "";$scope.label = "MyLabel";mdSelect = "<md-select ng-model='choice' multiple='" + $scope.isMultiple + "'>"+<md-option ng-repeat='option in options' value='{{option.value}}'>{{option.label}}</md-option>"+"</md-选择>";mdSelectElement = angular.element(mdSelect);myInputContainer.append(mdSelectElement);$compile(myInputContainer)($scope);});
I do not understand why the expression "{{isMultiple}}" is not evaluated in this code:
HTML:
<md-input-container style="width: 30%;">
<label>{{label}}</label>
<md-select ng-model="choice" multiple="{{isMultiple}}">
<md-option value="1">Option 1</md-option>
<md-option value="2">Option 2</md-option>
<md-option value="3">Option 3</md-option>
</md-select>
</md-input-container>
JS:
angular.module('app', ['ngMaterial'])
.controller('AppCtrl', AppCtrl);
function AppCtrl($scope) {
$scope.isMultiple = false;
$scope.choice = "";
$scope.label = "MyLabel";
}
Full code on Plunker: https://plnkr.co/edit/a5yCLW?p=preview
The Dropdown control should NOT be multi-selectable in this example.
解决方案
It is not possible to pass an expression to the attribute multiple
, according to the documentation:
However, one way around this is to create the md-select
in the code - CodePen
Markup
<div ng-controller="AppCtrl" ng-cloak="" ng-app="MyApp">
<md-input-container id="myInputContainer" style="width: 30%;">
<label>{{label}}</label>
</md-input-container>
</div>
JS
angular.module('MyApp',['ngMaterial', 'ngMessages', 'material.svgAssetsCache', 'ngDialog'])
.controller('AppCtrl', function($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);
});
这篇关于AngularJS/Material:为什么不评估表达式?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文