How to access a global variable within an Angular application

Using node express and angular, I have set up a route in my express app.js where I pass a variable to the rendered page:

app.get('/test', function(req, res){
  res.render('test', { user: 12345 });
});

Within my 'test' view, I establish a connection to angular by utilizing ng-controller:

<div ng-controller='testCtrl'> <!--some markup here--> </div>

In my angular controllers.js file, I define a function for my view like this:

function testCtrl($scope) {
    /*...some code here...*/
}

The question now arises - how can I access the 'user' variable that was passed into the view from express within my controller function?

Answer №1

If you are utilizing a template to display a view, there are two separate processes taking place: (1) the server rendering a page with the user variable and then (2) AngularJS running in the browser. Due to this separation, passing a variable from the server-side rendering to AngularJS is not straightforward.

However, there is a useful directive known as ngInit that can evaluate an expression during the bootstrapping process. In the case of using Jade templates in ExpressJS, you could implement something similar to this:

div(ng-init='user = "'+user+'"')

This code snippet would result in the following HTML output:

<div ng-init="user = 'whatever-server-sent'"></div>

By employing this approach, when AngularJS initializes this section of the page (or any partial or template), the user variable will transform into a scope variable carrying the value received from the server.

I have not tested the Jade code provided, and my expertise lies elsewhere. However, this guidance should set you in the right direction. If you are utilizing a different templating engine, feel free to inform me so I can adjust my response accordingly.

Answer №2

Angular allows access to Jade variables by assigning interpolated values to a variable in the ng-init directive.

To achieve this, you need to convert the user into a string and then interpolate it using

#{value}
div(ng-init='angularUser = #{JSON.stringify(user)}')

It's important to note that in this scenario, the user variable is exclusively a Jade variable.

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