You are returning just javascript and i guess this will have a problem with the new lines. In my opinion it's better to only return html in either json response or just html. So your login function will then look like this: (With just html response)

public static function login()
{
      return View::make('ajax-login')->render();
}

When making your ajax call you can do something like this:

$.ajax({
[YourAjaxConfigSettings]
}).done(function(response){
       $('.modal_container').html('<div style="display:none"><a href="#myModal" id="popup-clicker" role="button" class="btn" data-toggle="modal"></a></div><div id="myModal" class="modal modal_hide fade" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true"><div class="modal-dialog"><div class="modal-content">'+ response +'</div></div></div>');
       document.getElementById('popup-clicker').click();
});

returning just plain html+js from controller will not magically update the elements on the browser. you must tell what to do with the result of the ajax response.

@arjan's example show how to do it.

Actually I will not be able to change my javascript code, because I have a modular system in my script and every module will use the same code for ajax requests.

Actually in this situation, I need a code snippet which will convert the html content into a single line. http://www.willpeavy.com/minifier/ is converting the code into a single line so if I can add a function, For instance, I can call the view file Class::minifyFunction(View::make('ajax-login')) so the html will be taken in a single line.

Is there an example code to achieve this or does laravel have function to do this?