old_contents: import json
  
  from django.http import HttpResponse
  
  from wagtail.utils.compat import render_to_string
  
  
  def render_modal_workflow(request, html_template, js_template, template_vars=None):
      """"
      Render a response consisting of an HTML chunk and a JS onload chunk
      in the format required by the modal-workflow framework.
      """
      response_keyvars = []
  
      if html_template:
          html = render_to_string(html_template, template_vars or {}, request=request)
          response_keyvars.append("'html': %s" % json.dumps(html))
  
      if js_template:
          js = render_to_string(js_template, template_vars or {}, request=request)
          response_keyvars.append("'onload': %s" % js)
  
      response_text = "{%s}" % ','.join(response_keyvars)
  
      return HttpResponse(response_text, content_type="text/javascript")
  
new_contents: import json
  
  from django.http import HttpResponse
  
  from wagtail.utils.compat import render_to_string
  
  
  def render_modal_workflow(request, html_template, js_template, template_vars=None):
      """
      Render a response consisting of an HTML chunk and a JS onload chunk
      in the format required by the modal-workflow framework.
      """
      response_keyvars = {}
  
      if html_template:
          html = render_to_string(html_template, template_vars or {}, request=request)
          response_keyvars['html'] = html
  
      if js_template:
          js = render_to_string(js_template, template_vars or {}, request=request)
          response_keyvars['onload'] = js
  
      return HttpResponse(json.dumps(response_keyvars), content_type="application/json")
  
subject: Tidy up render_modal_workflow