Question

在我的自定义元素中，我有一个可绑定的属性＆＃34; menu＆＃34;从外面设置。我的问题是＆＃34;菜＆＃34;在菜单属性设置之前，依赖于菜单的属性被查询（因此菜单未定义且菜肴无法检索）。我能在这做什么？

菜单-control.ts：

import { bindable } from 'aurelia-framework';

import { Menu } from '../../../app/model/menu';
import { Dish } from '../../../app/model/dish';

export class MenuControl {

    @bindable menu: Menu;

    get dish1() {
        return this.getDish(1);
    }

    get dish2() {
        return this.getDish(2);
    }

    get dish3() {
        return this.getDish(3);
    }

    getDish(dishNo: number) {
        return this.menu.dishes.find(x => x.dishNo == dishNo);
    }
}

菜单-control.html：

<require from="../dish-control/dish-control"></require>

<div class="tab-content" style="margin-top: 20px; width: 800px;">
    <div class="tab-pane fade in active">
        <div class="row">
            <div class="col-md-8">
            </div>
            <div class="col-md-2" style="padding-left: 0;">
            </div>
            <div class="col-md-2" style="padding-left: 0;">
                <label>Vegetarisch</label>
            </div>
        </div>
        <h4>Men&uuml; 1</h4><dish-control dish.bind="dish1"></dish-control>
        <h4>Men&uuml; 2</h4><dish-control dish.bind="dish2"></dish-control>
        <h4>Men&uuml; 3</h4><dish-control dish.bind="dish3"></dish-control>
    </div>
</div>

Answer 1

您应该能够将if.bind="menu && menu.dishes"放在任何父组件上<dish-control>，甚至<dish-control>本身。这样，<dish-control>不会被附加到DOM并初始化自己，直到this.menu.dishes存在。

Aurelia：Bindable属性设置太晚了＃34;

1 个答案: