Tips for avoiding errors caused by chart adjustments in Angular.js

I have two different perspectives, view A and view B. In view A, I present my chart. However, upon transitioning to view B, I encounter a quick error. It seems that this error arises due to a setTimeout function not being completed before the view change occurs. How can I resolve this issue and prevent the error?

/* myApp module */
var myApp = angular.module('myApp', ['ui.router'])
.config(function ($stateProvider) {

    $stateProvider.state('A', {
        url: "/A",
        template: '<div id="chart"></div><a ui-sref="B">NEXT</a>',
        controller: function ($scope) {
        var chartSensorial = c3.generate({
          bindto: '#chart',
            data: {
                columns: [
                    ['&nbsp;', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
                ],
                type: 'bar',
                labels:true
            },
            axis: {
                rotated: true,
                x: {
                    type: 'category',
                    categories: ['α A.N', 'NUC', 'LYS', 'PHE', 'LEU', 'ILE', 'CYS', 'MET', 'VAL', 'TYR', 'PRO', 'ALA', 'THR', 'ARG', 'HIS', 'GLY', 'SER', 'GLU', 'ASP'],
                },
                y:{
                  label:"Concentración"
                }
            },
            transition: {
               duration: 2000
            }
        }); 

         setTimeout(function () {
            chartSensorial.load({
            columns: [
                    [5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5]
                ]
            });
          },2000)
        }
    }).state('B', {
        url: "/B",
        template: '<a ui-sref="A">BACK</a>',
        controller: function ($scope) {
            console.log("B");
        }
    });
})

.controller('MainCtrl', function ($scope, $state) {
 $state.go("A");
});

http://jsfiddle.net/yruj7n4e/

https://i.sstatic.net/QjEbi.gif

Answer №1

It's important to remember to cancel your timeout when the $scope is destroyed in order to prevent accessing scope-related variables after it has been destroyed.

To achieve this, you should save the return value of setTimeout, listen for the $destroy event, and then clear the timeout within that event:

var myTimeout = setTimeout(function () {
    chartSensorial.load({
        columns: [
            [5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5]
        ]
    });
},2000);

$scope.$on('$destroy', function(){
    clearTimeout(myTimeout); // Clear the timeout so it does not trigger if it hasn't already
});

Additionally, consider using Angular's native $timeout instead of manually managing timeouts with setTimeout/clearTimeout.

Answer №2

It is important to set the timeout for transition duration and chartSensorial.load to 2000 because it prevents interruptions in chart loading when changing states. If you wait until the load is complete before changing states, you can avoid errors.

Alternatively, you can decrease the timeouts to 100 milliseconds each to speed up the loading process and prevent console errors from occurring when changing states quickly.

View working example on jsFiddle

P.S. In AngularJS applications, it is recommended to use $timeout instead of setTimeout for better integration with Angular's scope.

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