Monday, September 22, 2014

Typical AngularJS routing

Here is the typical routing I use for my AngularJS apps.

$routeProvider
    .when("/app/customer/:customerid/:departmentid", {
        templateUrl: "/app/customer/customer.html",
        controller: "customer",
        controllerAs: "vm",
        caseInsensitiveMatch: true,
        resolve: ['customerService', function (customerService) {
            return customerService.resolve();
        }]

    })

As you see in addition to the regular routing attributes, I also used additional attributes such as controllerAs, resolve etc. Here is the step by step dissection of my routing configuration
    .when("/app/customer/:customerid/:departmentid", {
As all of you know, with the above statement I am defining a routing which takes customerid and departmentid as query parameters
        templateUrl: "/app/customer/customer.html",
        controller: "customer",
With these above two statements I am defining the templateUrl and controller for my routing.
        controllerAs: "vm",
I like the controllerAs feature. It eliminates the need of using $scope in my code and make my code clean.
        caseInsensitiveMatch: true,
As the name suggests, Angular performs a case insensitive matching while looking at the url for routing. This is important if are using a combination of server (like asp.net) and client routing
        resolve: ['customerService', function (customerService) {
            return customerService.resolve();
        }]
This is one of the important features of my routing. I don’t want to burden my compiler with fetching the data from server and activities other than rendering. As these are model or domain specific, I create a service for each controller to handle these activities. As you know in most scenarios you need to fetch data from the server before rendering the page, “resolve” is designed for that activity. Until resolve returns (fetches the data or any other activity) Angular waits and will not render the page. Resolve option also helps avoiding the FOUC. Please see my blog on this for further details

As you see with my routing configuration, I am able to handle the preprocessing and also reduce the dependency of global $scope variable. 

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