Angular js - echoing data across multiple html pages - angularjs

Question

I've worked with many languages and environments (predominately iOS & C#) and have always managed to avoid working with scripting languages. That avoidance streak has come to an abrupt end: as a huge angularjs project was thrown in my lap - now I'm scrambling to understand this very strange world. Some features are really cool, other techniques have me thoroughly baffled. I've spent weeks reading tutorials, studying examples and I still cannot solve a relatively simple problem regarding best practices and structure of the code.
This is what I need to do: I have a form, where the user will input data (for argument's sake, its two fields of number type.) I need to have a banner at the top of the page with the sum of the two input fields - that by itself is relatively easy - but the problem for me, is repeating this banner on subsequent pages.
Home page will contain links to:
page 1
page 2
The link to page 2 will not be available until the user inputs data on page 1, forcing the user to visit page 1, first. The banner element needs to be a separate file. Page 2 is a passive display of the data, Page 1 is only page that can actively edit the data.
page 1: would look like this --
banner.html (sum of fields A & field B)
input field A
input field B
page 2:
banner.html (sum of field A & field B)
Lorem Ipsum ....
What's the best way to achieve this task?

Answer 1

You can have an index page with the banner on top, and partials using the same controller. The value of the banner will be a controller variable.
To use partials, inside the index page, you'll need to include the ngRoute module, and the script tag linking to it.
You'll have a div like this.
<div ng-view=""></div>
You'll have a partialRoutes.js file looking something like this.
myApp.config(function($routeProvider){
$routeProvider
.when('/',{
templateUrl: './partials/things.html'
})
.when('/stuff',{
templateUrl: './partials/stuff.html'
})
.when('/otherstuff',{
templateUrl: './partials/otherstuff.html'
})
.otherwise({
redirectTo: '/',
})
});
When you include ngRoute it will look something like this.
var myApp = angular.module('myApp', ['ngRoute']);
Here are the docs for ngRoute. Hope I helped.
https://docs.angularjs.org/api/ngRoute

Answer 2

Personally, I would have a service, lets call it userData. Your inputController would then write the details of the inputs to the userData service.
Your bannerController would then be notified of changes to the data in the userData service (via $watch or $broadcast)
This way when you switch pages the bannerController should not change and will still display this information
Notes:
This relies on you using some kind of AngularJS routing technique such as NGroute or UI Router. If a hard page navigation is made then the userData will have to be stored server side.
It would probably be better for the banner to stay outside any ui-view so that it is unaffected by navigation, but if it is then as the userData service will still be alive and holding the correct data when it is recreated it will have access to the same data

Answer 3

If both pages have same controller, then $scope can be used to achieve this. If pages have different controller, $rootScope can be used to share variables.