使用 ng-repeat 创建多级列表 [英] Creating multi-level lists with ng-repeat

问题描述

我正在尝试从包含嵌套数据的对象创建一个多级列表:

I am trying to make a multi-level list from an object that contains the nesting data:

function linksRarrange($scope) {
    $scope.links = [
        {
            text: 'Menu Item 1',
            url: '#',
        },{
            text: 'Menu Item 2',
            url: '#',
            submenu: [
                {
                    text: 'Sub-menu Item 3',
                    url: '#',
                },{
                    text: 'Sub-menu Item 4',
                    url: '#',
                    submenu: [
                        {
                            text: 'Sub-sub-menu Item 5',
                            url: '#',
                        },{
                            text: 'Sub-sub-menu Item 6',
                            url: '#',
                        }
                    ]
                }
            ]
        },{
            text: 'Menu Item 3',
            url: '#',
        }
    ];
}

为什么只输出前2级菜单而忽略第三级?

Why does this outputs only the first 2 level menus and ignores the third?

<ul>
    <li ng-repeat="link in links"><a href="{{link.url}}">{{link.text}}</a>
        <ul>
            <li ng-repeat='sublink in link.submenu'><a href="{{sublink.url}}">{{sublink.text}}</a></li>
        </ul>
    </li>
</ul>

推荐答案

你只看到两个级别，因为你只有两个级别的循环:ng-repeat 只是重复它给定的内容，并没有调用自身递归.

You're only seeing two levels because you've only got two levels of loops: the ng-repeat just repeats over what it's given, and does not call itself recursively.

您的第一个循环只是在第一级重复，而您的第二个循环只是在第二级重复.您的代码中没有任何内容要寻找第 3 级或更深的层次.

Your first loop just repeats over the first level, and your second loop just repeats over the second level. There's nothing in your code looking for a 3rd level or any deeper levels.

您可以递归调用相同的 ng-include，这似乎有效.我已经在 plunker 中演示了这个:http://plnkr.co/edit/NBDgqKOy2qVMQeykQqTY?p=preview

You can call the same ng-include recursively, and that appears to work. I've demo'ed this in plunker here: http://plnkr.co/edit/NBDgqKOy2qVMQeykQqTY?p=preview

但是使用 ng-init 复制值的代码非常可怕.它有效，但它可能更好地编写为指令.

But that code is pretty dreadful using ng-init to copy the values around. It works, but it could probably be better written as a directive.

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