angular.js - How to achieve real-time communication in two controllers in angularjs?

Question

There are two controllers a and b; there is a click event in controller a. After clicking, how to display a p in control b?

For example: controller a is a menu, controller b is a content area, click on different menus in a, and control the display of different content in b,

Some effort: I tried service and factory, but I can only share data but cannot trigger it in real time

PHP中文网 · Answer

I have tried two methods here:
1. Use angular’s own event mechanism

(function() {
    'use strict';

    angular
        .module('app.core')
        .factory('eventService', eventService);

    /* @ngInject */
    function eventService(logger) {
        var service = {
            on_angular_event: on_angular_event,
            trigger_angular_event: trigger_angular_event
        };

        return service;

        function on_angular_event(scope, type, f) {
            scope.$on(type, function(event, data){
                f(data);
                // 处理时间后阻止事件继续扩散
                event.stopPropagation = true;
            })
        }

        function trigger_angular_event(scope, deriction, type, data) {
            // deriction: up, down, sibling
            if (deriction === 'up') {
                scope.$emit(type, data);
            } else if (deriction === 'down'){
                scope.$broadcast(type, data);
            } else if (deriction === 'sibling'){
                scope.$parent.$broadcast(type, data);
            }
        }
    }
})();

Used in the controller, add a to send event notification to b:

controller_A.$inject = [$scope, eventService];
function controller_A($scope, eventService) {
    //send event
    //direction 根据 A 和 B 的关系来定，父子用up或down，兄弟用sibling
    eventService.trigger_angular_event($scope, direction, 'event_name', data);
}

controller_B.$inject = [$scope, eventService];
function controller_B($scope, eventService) {
    // recv event from controller_A
    eventService.on_angular_event($scope, 'event_name', function(data){
        // do something here
    });
}

2. Use service to simulate callback events. The essence is to use service to save a global callback function for use between controllers

(function() {
    'use strict';

    angular
        .module('app.core')
        .factory('eventService', eventService);

    /* @ngInject */
    function eventService(logger) {
        var onEventFunc = {};

        var service = {
            on: on,
            trigger: trigger
        };

        return service;

        function on(type, f) {
            onEventFunc[type] = onEventFunc[type] || [];
            var funcs = onEventFunc[type];

            // Todo:同一个事件可以让不同的监听者监听，但是同一个监听者的回调只能注册一次。而回调函数多用匿名函数注册，此处用toString()进行区分，效率较低。
            var exist = false;
            for (var i = 0; i < funcs.length; i++) {
                if (funcs[i].toString() === f.toString()) {
                    exist = true;
                    break;
                };
            };

            if (!exist) {
                funcs.push(f);
            };
        }

        function trigger(type, data) {
            //logger.info('trigger', data);
            for (var item in onEventFunc) {
                if (item === type) {
                    var funcs = onEventFunc[item];
                    for (var i = 0; i < funcs.length; i++) {
                        funcs[i](data);
                    };
                }                    
            }
        }
    }
})();

过去多啦不再A梦 · Answer

Hmm. You can try event bubbling and tunneling mechanisms.

给我你的怀抱 · Answer

You can take a look at this

To be more direct, you can try $broadcast and $on, but the efficiency will be poor

滿天的星座 · Answer

Seeing that what is written above is not pure enough (it is mixed with other considerations), I will add a pure version.
Demo provided

The code is as follows




    
    




    



    
will show me

黄舟 · Answer

1). Create an event bus to manage all events globally
2). Use $broadcast and $emit