Exploring how Ruby interacts with AngularJS variables in a view

Question

Exploring how Ruby interacts with AngularJS variables in a view

Currently, I have implemented angular's ng-repeat in a Ruby .erb view. I now need to create a link_to a page that is dedicated to a specific IP address. Initially, I attempted:

<td><%= link_to '{{ roll.system }}' ,'server/'+'{{ roll.system }}' %></a></td>

,

where the {{roll.system}} represents the IP stored in an angular.js variable. The overall path would be localhost/server/127.0.0.1 but unfortunately, it doesn't work due to the dots in the IP address. So, my next approach is to turn the IP address into a hash and then decode it after routing.

My current code snippet is as follows:

<td><%= link_to '{{ roll.system }}' ,"server/"+Base64.urlsafe_encode64('{{ roll.system }} %></a></td>

The issue here is that Base64 encodes the string literally, resulting in a hash of the exact string '{{ roll.system }}'. What I actually need is for it to reference the value stored in the angular variable.

Though the link_to function seems to be working fine, I am struggling with this specific problem.

I kindly ask not to provide advice such as 'rewrite your app from scratch'.

javascript ruby-on-rails ruby angularjs erb

Answer 1

Answer №1

There seems to be a mix-up between the rendering of a Rails view and the execution of Angular code.

Upon accessing your app, the Rails view is first rendered, converting the link_to into raw HTML like this:

<td><a href="{{ roll.system }}/server/{{ roll.system }}"></a></td>

After the view is rendered and displayed in the browser, the Angular code takes over, replacing the {{ roll.system }} placeholders with actual values:

<td><a href="127.0.0.1/server/127.0.0.1"></a></td>

The issue with the second approach is that the Base64.urlsafe_encode64 function runs during the Rails view rendering process, so the Angular script won't have updated the roll.system value yet. This results in static HTML regardless of the actual roll.system value:

 <td><a href="{{ roll.system }}/server/e3sgcm9sbC5zeXN0ZW0gfX0="></a></td>

An alternative solution would be to encode the string using base64 in the Angular script. You could explore libraries like angular-base64 for this purpose. Your code might look something like:

<td><a href="{{ roll.system }}/server/{{ roll.encoded_system }}"></a></td>

In this case, you would assign the value of roll.encoded_system in your Angular controller. As mentioned by Martin, you can also utilize the native window.btoa() method for encoding. It's worth noting that calling this method directly in the template may not work as expected and could require implementation within the controller.

Answer 2

There seems to be a mix-up between the rendering of a Rails view and the execution of Angular code.

Upon accessing your app, the Rails view is first rendered, converting the link_to into raw HTML like this:

<td><a href="{{ roll.system }}/server/{{ roll.system }}"></a></td>

After the view is rendered and displayed in the browser, the Angular code takes over, replacing the {{ roll.system }} placeholders with actual values:

<td><a href="127.0.0.1/server/127.0.0.1"></a></td>

The issue with the second approach is that the Base64.urlsafe_encode64 function runs during the Rails view rendering process, so the Angular script won't have updated the roll.system value yet. This results in static HTML regardless of the actual roll.system value:

 <td><a href="{{ roll.system }}/server/e3sgcm9sbC5zeXN0ZW0gfX0="></a></td>

An alternative solution would be to encode the string using base64 in the Angular script. You could explore libraries like angular-base64 for this purpose. Your code might look something like:

<td><a href="{{ roll.system }}/server/{{ roll.encoded_system }}"></a></td>

In this case, you would assign the value of roll.encoded_system in your Angular controller. As mentioned by Martin, you can also utilize the native window.btoa() method for encoding. It's worth noting that calling this method directly in the template may not work as expected and could require implementation within the controller.

Exploring how Ruby interacts with AngularJS variables in a view

Answer №1

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