递归嵌套angularjs指令

本文介绍了递归嵌套angularjs指令的处理方法，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

我在我的应用程序中遇到了一个问题，我想要一个指令，在它的模板中，它应该有条件地决定是否在其中递归呈现相同的指令.我试图重新创建它，这个例子也不起作用.该指令未呈现且没有错误.然而，我本可以犯一个不同的错误.

I am having a problem in my application where I would like to have a directive, and inside its template it should conditionally decide whether to recursively render that same directive within it. I have tried to recreate it, and this example is also not working. The directive is not rendered and without errors. I could have made a different mistake in it however.

https://plnkr.co/edit/PhDvLZyWvyFThg57qZDV?p=preview

index.html

<!DOCTYPE html>
<html>

  <head>
    <script data-require="angularjs@1.5.0" data-semver="1.5.0" src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.5.0/angular.js"></script>
    <link rel="stylesheet" href="style.css" />
    <script src="script.js"></script>
  </head>

  <body ng-app="app" ng-controller="MainCtrl">
    <ul class="nav navbar-nav">
      <li ng-repeat="menu in menus">
        <button class="btn btn-default dropdown-toggle" type="button">
          <span ng-bind="menu.Text"></span>
          <span class="caret"></span>
        </button>
        <ul class="dropdown-menu" role="menu">
          <li menu-entry menus="menu.SubMenus"></li>
        </ul>
      </li>
    </ul>
  </body>

</html>

menu-entry.html

<li ng-repeat="menu in menus">
    <a ng-if="menu.Submenus.length===0" ng-bind="menu.Text"></a>
    <button ng-if="menu.Submenus.length>0" type="button" ng-bind="menu.Text">
        <span class="caret caret-right"></span>
    </button>
    <ul ng-if="menu.Submenus.length>0" class="dropdown-menu" role="menu">
        <li menu-entry menus="menu.SubMenus"></li>
    </ul>
</li>

script.js

var app = angular.module('app', []);

app.controller('MainCtrl', function($scope) {
  $scope.menus = [
    { Text: '1', SubMenus: [
      { Text: '1.1', SubMenus: [{Text:'1.1.1',SubMenus:[]},{Text:'1.1.2',SubMenus:[]},{Text:'1.1.3',SubMenus:[]}]},
      { Text: '1.2', SubMenus: [{Text:'1.2.1',SubMenus:[]},{Text:'1.2.2',SubMenus:[]},{Text:'1.2.3',SubMenus:[]}]},
      { Text: '1.3', SubMenus: [{Text:'1.3.1',SubMenus:[]},{Text:'1.3.2',SubMenus:[]},{Text:'1.3.3',SubMenus:[]}]}
      ]},
    { Text: '2', SubMenus: [
    { Text: '2.1', SubMenus: [{Text:'2.1.1',SubMenus:[]},{Text:'2.1.2',SubMenus:[]},{Text:'2.1.3',SubMenus:[]}]},
    { Text: '2.2', SubMenus: [{Text:'2.2.1',SubMenus:[]},{Text:'2.2.2',SubMenus:[]},{Text:'2.2.3',SubMenus:[]}]},
    { Text: '2.3', SubMenus: [{Text:'2.3.1',SubMenus:[]},{Text:'2.3.2',SubMenus:[]},{Text:'2.3.3',SubMenus:[]}]}
    ]},
    ];
});

app.directive('menuEntry', function() {
        var cFn = ['$scope', function ($scope) {

        }];

        var lFn = function (scope, element, attr, ctrl, transclude) {
        };

        return {
            restrict: 'A',
            replace: true,
            templateUrl: 'menu-entry.html',
            controller: cFn,
            link: lFn,
            scope: {
                menus: '='
            }
        };
});

推荐答案

您当前的指令实现基本上存在 3 个问题.

Basically there are 3 problems with your current directive implementation.

问题是您在 li 元素上使用了 replace: true 指令，它再次添加了一个具有 ul 的模板.因此生成的 html 格式不正确，因为您不能再次将 ul 放入 ul 中.将您的指令 replace: true 更改为 replace: false **OR 只需删除该选项即可.**
你的指令模板 menu.Submenus 应该是 menu.SubMenus

The problem is you had directive on li element with replace: true which is adding one template which has ul again. So resultant html was incorrect in format, as you can not have ul inside ul again. Change you directive replace: true to replace: false **OR just remove that option.**
There on your directive template menu.Submenus should be menu.SubMenus

模板

<li ng-repeat="menu in menus">
  {{menu.Text}}
    <a ng-if="menu.SubMenus.length == 0" ng-bind="menu.Text"></a>
    <button ng-if="menu.Submenus.length>0" type="button" ng-bind="menu.Text">
        <span class="caret caret-right"></span>
    </button>
    <ul ng-if="menu.SubMenus.length>0" class="dropdown-menu" role="menu">
        <li menu-entry menus="menu.SubMenus"></li>
    </ul>
</li>

演示 Plunkr

这篇关于递归嵌套angularjs指令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！

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