angularJs-directive之组件复用

最新推荐文章于 2024-10-21 18:30:00 发布

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本文探讨了单向数据流设计在AngularJS中的应用，详细介绍了如何在父作用域和子作用域间传递和更新数据，展示了具体的代码实现。

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result

单向数据流设计

父作用域type改变，type值传给子作用域的childrenType，改变子作用域的视图。子作用域视图发生改变， $s c o p e .$ emit(‘changeType’, v);通过$emit告诉type改变值，通过type的变化改变视图。数据一定是由父流向子的。

上代码：

scopetest.html

<!DOCTYPE html>
<html lang="en" ng-app="app">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="https://cdn.bootcss.com/angular.js/1.6.3/angular.min.js"></script>
    <script type="text/javascript" src="js/angular-tree-control.js"></script>
    <script src="./js/context-menu.js"></script>
    <link rel="stylesheet" type="text/css" href="css/tree-control.css">
    <link rel="stylesheet" type="text/css" href="css/tree-control-attribute.css">
    <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/4.0.0/css/bootstrap.min.css">
    <script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.slim.min.js"></script>
    <script src="https://cdn.bootcss.com/popper.js/1.12.9/umd/popper.min.js"></script>
    <script src="https://cdn.bootcss.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
</head>
<body>
<div ng-controller="father" class="container p-3 mb-2 bg-primary">
    <p class="font-weight-bold"> 父作用域：</p>
    <div>
        <p class="font-weight-bold">
            $scope:{'type':{{type}}}
        </p>
    </div>
    <div>
        <button type="button" class="btn btn-dark" ng-click="chooseType(1)">展示type1</button>
        <button type="button" class="btn btn-secondary" ng-click="chooseType(2)">展示type2</button>
        <button type="button" class="btn btn-success" ng-click="chooseType(3)">展示type3</button>
    </div>
    <div class="container p-3 mb-2 bg-danger" style="margin-top: 20px;">
        <view-of-type type="{{type}}" class=""></view-of-type>
    </div>
</div>
<script>
    const app = angular.module('app', []);
    app.controller('father', function ($scope) {
        $scope.type = 0;
        $scope.chooseType = function (value) {
            $scope.type = value;
        };
        $scope.$on('changeType', function (event, data) {
            $scope.type = data;
        })
    });
    app.controller(
        'viewOfTypeController', function ($scope) {
            $scope.changeFlavor = function () {
                let v = parseInt($scope.childrenType);
                v = v === 1 ? 2 : v === 2 ? 3 : 1;
                $scope.$emit('changeType', v);
            }
        }
    );

    app.directive("viewOfType", function () {
        return {
            scope: {
                childrenType: '@type',
            },
            restrict: "AE",
            templateUrl: "viewOfType.html",
            controller: 'viewOfTypeController',
            link: function (scope, element, attrs) {
            }
        }
    });

</script>
</body>
</html>

组件 viewOfType.html

<div class="card">
    <h5 class="card-header">子作用域：</h5>
    <div class="card-body">
        <p class="card-text" ng-show="childrenType==1"> $scope:{'childrenType':{{childrenType}}}</p>
        <p class="card-text" ng-show="childrenType==2"> $scope:{'childrenType':{{childrenType}}}</p>
        <p class="card-text" ng-show="childrenType==3"> $scope:{'childrenType':{{childrenType}}}</p>
        <button class="btn btn-primary" ng-click="changeFlavor()">click</button>
    </div>
</div>