“Cannot read property 'id' of undefined” when parsing an array declared in a factory

问题

I am building a basic app (with MEAN web frameworks and node webkit) in order to understand angularjs better.

Here is the content of my notificationFactory.js

function notificationFactory() {

    var fooMessages = [

        {
            id: 4,
            dismissable: true,
            name: "fooooBaaar",
            function: '',
            showInTopBar: false,
            priority: "high",
            icon: 'fooIconBarBarBar',
            topBarIcon: 'fooIconIconIcon'
        },

        {
            id: 3,
            dismissable: true,
            name: "foofooBarBar",
            function: '',
            showInTopBar: false,
            priority: "high",
            icon: 'fooIconfooIcon',
            topBarIcon: 'IconIconIcon'
        },

        {
            id: 2,
            dismissable: true,
            name: "foo foo",
            function: '',
            showInTopBar: false,
            priority: "high",
            icon: 'fooBaaaaaar',
            topBarIcon: 'IconFooIcon'
        },

        {
            id: 1,
            dismissable: true,
            name: "foo",
            function: '',
            showInTopBar: false,
            priority: "high",
            icon: 'fooIcon',
            topBarIcon: 'fooIconIcon'
        },
    ]

    fooMessages.TopBarDismiss = function (message) {
        $.each(fooMessages, function (i, v) {
            if(v.id = message.id) {
                fooMessages.splice(i,1);
            }
        });

    }

    return fooMessages;

}

angular.module('fooDemo').factory('notificationFactory', notificationFactory);

I call the TopBarDismiss() function in an HTML template using:

<div class="fooDismiss" ng-click="notificationFactory.TopBarDismiss(message)">Dismiss</div>

When I check out the console after pressing my Dismiss "button", I get this:

 TypeError: Cannot read property 'id' of undefined
at notificationFactory.js:94
at Function.m.extend.each (jquery.min.js:2)
at Array.fooMessages.TopBarDismiss (notificationFactory.js:93)
at fb.functionCall (angular.js:10847)
at angular-touch.js:472
at k.$get.k.$eval (angular.js:12702)
at k.$get.k.$apply (angular.js:12800)
at HTMLDivElement.<anonymous> (angular-touch.js:471)
at angular.js:3097
at r (angular.js:325)angular.js:10072 (anonymous function)angular.js:7364 $getangular.js:12802 $get.k.$applyangular-touch.js:471 (anonymous function)angular.js:3097 (anonymous function)angular.js:325 rangular.js:3096 r.triggerHandlerangular.js:3111 S.(anonymous function)angular-touch.js:453 (anonymous function)angular.js:2853 (anonymous function)angular.js:325 rangular.js:2852 c

so it must be the

$.each(fooMessages, function (i, v) {
    if (v.id == message.id) {
    } 
});

part that is quite horrible.

Can you, guys, spot the error for me, please?

回答1:

First, as said in the comments, you need to make sure the message object passed is really the one you're looking for.

Then, if you just want to splice you can do:

fooMessages.TopBarDismiss = function (message) {
        var index;
        for (var i = 0; i < fooMessages.length; i++) {
            if(fooMessages[i].id == message.id) {
                index = i;
                break;
            }
        }
        if (index) {
              fooMessages.splice(index,1);
        } 

}

回答2:

I think you need to pass message to the inner function. In that scope, message is undefined.

来源：https://stackoverflow.com/questions/28763272/cannot-read-property-id-of-undefined-when-parsing-an-array-declared-in-a-fac