1
我有以下模块:角:在HTML另一个模块的使用功能/模板
// in module app/util/utils.ts
export function isNullOrUndefined(obj: any) {
return obj === undefined || obj === null || obj === 'undefined' || obj === '';
}
我想使用的功能在我的组件:
// in module app/component/component.ts
@Component({
selector: 'app-component',
template: `
<span *ngIf="!isNullOrUndefined(value)">Should not be there</span>
`
})
export class Component {
value = null;
}
不过,我得到导入这样的函数并没有帮助
Component.html:2 ERROR
TypeError: _co.isNullOrUndefined is not a function
at Object.View_Component_1._co [as updateDirectives] (Component.html:2)
at Object.debugUpdateDirectives [as updateDirectives] (core.es5.js:13065)
at checkAndUpdateView (core.es5.js:12245)
at callViewAction (core.es5.js:12610)
at execEmbeddedViewsAction (core.es5.js:12568)
at checkAndUpdateView (core.es5.js:12246)
at callViewAction (core.es5.js:12610)
at execComponentViewsAction (core.es5.js:12542)
at checkAndUpdateView (core.es5.js:12251)
at callViewAction (core.es5.js:12610)
:当组件被加载以下错误消息
import {isNullOrUndefined} from '../util/util';
这怎么解决?
好吧,作品!然而,这不是一个很好的解决方案,不是吗(批评Angular不是你).. – SilverJan
AFAIK有讨论使这种体验更好,但我不知道状态。 –