包含JavaScript的Rails JSON响应

Question

I have an application that responds to .json (json format). I also have to build a bookmarklet that makes a div on the page where you execute it. This bookmarklet makes a request to the application and the application should respond with a json object that contains the javascript. Let's say this is all the javascript is:

function selectElementContents()
{
  el = document.getElementById('quicklink_value')
  if (document.body.createTextRange) {
        // IE
        var textRange = document.body.createTextRange();
        textRange.moveToElementText(el);
        textRange.select();
        textRange.execCommand("Copy");
    }
  else if (window.getSelection && document.createRange) {
        // non-IE
        var range = document.createRange();
        range.selectNodeContents(el);
        var sel = window.getSelection();
        sel.removeAllRanges();
        sel.addRange(range);
        var range = document.createRange();
        try {
        var successful = document.execCommand('copy');
        var msg = successful ? 'successful' : 'unsuccessful';
    } catch(err) {
        console.log('Oops, unable to copy');
      }
    }
}
content = "<%= escape_javascript(render(:partial => 'events/bookmarklet').html_safe) %>";
_tp_bookmarklet(content);

As you can see I also have a partial that needs to be rendered inside a variable named content.

def bookmarklet
    respond_to do |format|
      format.json
    end
  end

This is the action that is being called by the bookmarklet. How can I put the javascript(with the content variable that contains the rendered partial in it) as the json response?
I can provide any additional info that is needed.

Answer 1

You can do it with simply

@content = escape_javascript(render(:partial => 'events/bookmarklet').html_safe) 

and then

format.json {content: @content}

and in you front end you could you can get the json response and response will have your html.

another way is to to do is to directly render the partial/template and sen it off as a json object... but that will work when you have a way to cater the controller variables in the partial... like if you are using controller variables either instance or local you should take care of those.

format.json { content: escape_javascript(render(:partial => 'events/bookmarklet').html_safe) }

or what you can do is a create a method may be private to render out your partial like

def blahblah (params...)
    escape_javascript(render(:partial => 'events/bookmarklet').html_safe)
end
........
format.json {content: blahblah(params)}