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gui construction - Cloud CDF and HTTPRedirect


Cross posted on community.wolfram.com


Question and requirements


Is it possible to HTTPRedirect from a Cloud CDF via e.g. Button action?




  • I need an interactive cloud cdf around it.




  • The action would not only redirect but evaluate arbitrary code prior to that.





  • If it matters the target page does not need to be any page but an arbitrary CloudObject is enough.




  • No, I don't want to hide old stuff and show new to the user, I really need to redirect.




  • No, open in new tab does not count.





So it would work analogously to this form's submit button:


CloudDeploy[
    FormFunction[{"go on and submit"}
      , Module[{link}
          , link = CloudPut[RandomReal[], Permissions -> "Public"]
          ; HTTPRedirect[link]
        ] &
    ]
  , Permissions -> "Public"

]

Problems


Wasn't able to achieve that, here's why:




  • Form/ApiFunctions where HTTPRedirect works well can't have interative CDFs embedded inside:


     CloudDeploy[
         FormFunction[
             { "this is ok"

             , ExportForm["this is not ok", "CloudCDFElement"]
             }
           , foo
         ]
       , Permissions -> "Public"
     ]


    enter image description here






  • and I can't trigger HTTPRedirect from cloud CDF, nothing happens:


        CloudDeploy[
          ExportForm[
            Button["Submit", Print[1]; HTTPRedirect["http://www.wolfram.com"]], 
            "CloudCDFElement"
          ], Permissions -> "Public"
         ]



    enter image description here






Answer



Here are results of my experiments, so far works:


CloudDeploy[
    ExportForm[
        DynamicModule[{x = 1}, Column[{

            Slider@Dynamic@x,
            Dynamic@x,
            Button["Test redirect",
                Module[{link},
                    link = "https://mathematica.stackexchange.com";
                    Print @ EmbeddedHTML[ StringTemplate[
                       ""
                    ]@link
                ]
            ]

        ]}]]
      , "CloudCDF"]
    , Permissions -> "Public"
  ]

.top. was added because EmbeddedHTML translates to an iframe and we don't want to redirect only that iframe itself. On the other hand your cloud object may be embedded in another page and .top. will redirect the whole page. You may need that or not, depends, at the end I'm using .parent. because I want to redirect only the CloudObject parent iFrame.


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