Ensure AngularJS creates a controller just once

Question

Ensure AngularJS creates a controller just once

In my search for a way to create a controller only once, I have not come across any satisfactory solutions.

I have discovered some alternative approaches:

Creating a controller list in $rootScope and adding newly created controllers to it
Developing a masterController where all created controllers are saved in its scope collection

Therefore, when my template is loaded, I need to utilize a specialized service to manage the controllers. The service must perform checks to determine if a controller has already been created - if so, load the existing one instead of creating a new one; otherwise, add the newly created controller to the collection.

The approach may seem straightforward but appears cumbersome when working with Angular. Maybe I am lacking expertise in Angular, which is why I have struggled to find a better solution.

Can you offer any suggestions for improvement or an alternative solution!? Maybe there's something already available in the base library that I'm unaware of...

Further clarification:

ng-app=singleApplication
|-ng-view

The SingleApplication utilizes ng-route to handle templates within ng-view. Each unique template has its own distinct controller. Every time a different view than the current one is applied, a new controller is instantiated. However, I want to avoid unnecessary server requests for data if a template has already been loaded before. I need to display the template with previous data, tables, and controls without re-creating the controller each time. All data is stored in the controller-scope (this), where all keys are unique, but I am uncertain whether to store the data in $scope or $rootScope.

javascript angularjs

Answer 1

Answer №1

When all controllers are grouped together under one module, we can easily access and manage them within that module.

Here's an example to demonstrate this concept:

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


app.controller('TextController', function ($scope) {
    $scope.text = {
        message: 'Welcome!!'
    };
});

app.controller('ItemController', function ($scope) {
    $scope.items = [{
        title: 'Pencil',
        quantity: 8,
        price: 4.2
    }, {
        title: 'Pen',
        quantity: 2,
        price: 5.2
    }, {
        title: 'Watch',
        quantity: 3,
        price: 10.2
    }];
});

Check out this CodePen for a live example.

Answer 2

When all controllers are grouped together under one module, we can easily access and manage them within that module.

Here's an example to demonstrate this concept:

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


app.controller('TextController', function ($scope) {
    $scope.text = {
        message: 'Welcome!!'
    };
});

app.controller('ItemController', function ($scope) {
    $scope.items = [{
        title: 'Pencil',
        quantity: 8,
        price: 4.2
    }, {
        title: 'Pen',
        quantity: 2,
        price: 5.2
    }, {
        title: 'Watch',
        quantity: 3,
        price: 10.2
    }];
});

Check out this CodePen for a live example.

Ensure AngularJS creates a controller just once

Answer №1

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