Parse a JSON Array in gsp

Question

I have this JSON array eg:filesList which I receive from my groovy controller:

[{"filenameAndPath":"a","description":"bb"},    {"filenameAndPath":"c","description":"d"},{"filenameAndPath":"e","description":"f"}]

In my gsp I want to render this into a format as such:

Filename and Path 
a
Description
bb
Filename and Path 
c
Description
d
Filename and Path 
e
Description
f

How would I parse the JSON into such labels and fields in a gsp page?

Why not do the work in the controller, rather than entrenching this sort of thing in the view? — tim_yates
– tim_yates, Commented Sep 15, 2016 at 19:00
Also, do you mean you send that to the GSP as a String of JSON text? Or are you sending a list of maps? — tim_yates
– tim_yates, Commented Sep 15, 2016 at 19:04
I would need the parameters from these <g:fields> in another controller. Is there a better way to design this ? — shanwar
– shanwar, Commented Sep 15, 2016 at 19:04

Gregor Petrin · Accepted Answer · 2016-09-15 20:19:59Z

4

Parse the JSON string in the controller first using the grails.converters.JSON.parse(jsonString) method, then pass the resulting object into your view and iterate over the arrays and objects using the g:each tag.

When iterating over objects/map entries (like in your {"filenameAndPath":"a","description":"bb"} example), you can use the nice shorthand syntax: <g:each in="${map}" var="key, value">..</g:each>

For the rest ordinary HTML should be enough.

answered Sep 15, 2016 at 20:19

Gregor Petrin

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Comments

V H · Accepted Answer · 2016-09-16 08:22:35Z

To Parse a json string it is as defined by Gregor above. The only thing to watch out for is json null in string which needs to be converted into a real null.

Here is a function to convert a json string to a map

Map parseJSONSelection(String jsonString) {
       def u=[]
       def m=[:]
       if (userSelection) {
           def item=JSON.parse(userSelection)
           item?.each {JSONObject  i->
               // when an element could be null set it to real null
               if (JSONObject.NULL.equals(i.field)) {
                   i.field=null
               }
               u << i
           }
           m.allfilesAndPaths=item?.collect{it.filenameAndPath}
           m.results=u
       }
       return m
   }

now in the map returned it will contain map.results which will be the iteration of the json string that you pass to your gsp.

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