CODEWITHSUNDEEP
jsongrailsgsp
chelder
chelder

Reputation: 3897

How retrieve a JSON object in a GSP view from a controller

The controller has the next method (I'm recycling my implementation of the bootstrap-file-upload plugin):

def uploadImage() {     
    String baseName;
    String imageExtension = uploadPhotoService.imagesExtension;
    String thumbnailExtension = uploadPhotoService.thumbnailsExtension;

    switch(request.method){
        case "GET":

            def results = []    
            String imagesDirectoryPath = uploadPhotoService.getImageDirectoryDestinationPath(params.idAlojamiento);
            def dir = new File(imagesDirectoryPath)

            if( dir.exists() ) {
                dir.eachFile { 
                    baseName = uploadPhotoService.removeFileExtension(it.getName());

                    results << [
                            name: baseName,
                            size: it.length(),
                            url: createLink(controller:'alojamiento', action:'picture', params:[imageName: baseName + "." + imageExtension, idAlojamiento: params.idAlojamiento]),
                            thumbnail_url: createLink(controller:'alojamiento', action:'thumbnail', params:[imageName: baseName + "." + thumbnailExtension, idAlojamiento: params.idAlojamiento]),
                            delete_url: createLink(controller:'alojamiento', action:'deleteImage', params:[baseName: baseName, idAlojamiento: params.idAlojamiento]),
                            delete_type: "DELETE"
                    ]
                }
            }               
            render results as JSON
            break;
        case "POST":
            (...)

In the view, there is the next line:

<g:include controller="alojamiento" action="uploadImage" params="[idAlojamiento:alojamientoInstance.id]"/>

So the Internet browser shows a text line with the content of the JSON results variable:

[{"name":"boceto escaleras patio","size":37567,"url":"/AlojamientoPrototipo/alojamiento/picture?imageName=boceto+escaleras+patio.jpg&idAlojamiento=1","thumbnail_url":"/AlojamientoPrototipo/alojamiento/thumbnail?imageName=boceto+escaleras+patio.png&idAlojamiento=1","delete_url":"/AlojamientoPrototipo/alojamiento/deleteImage?baseName=boceto+escaleras+patio&idAlojamiento=1","delete_type":"DELETE"},
(...)

I don't want to show that text line. I want to loop through all images. I think it could work:

<g:each in="${results}">
    <img src="${it.thumbnail_url}"/>
</g:each>

How could I to pass the results JSON variable to the GSP view to loop through it?

Upvotes: 1

Views: 4749

Answers (1)

James Kleeh
James Kleeh

Reputation: 12238

To get a variable like that:

<g:set var="results" value="${g.include(controller: "alojamiento", action: "uploadImage", params: [idAlojamiento:alojamientoInstance.id])}" />  
<g:each in="${JSON.parse(results)}">
    <img src="${it.thumbnail_url}"/>
</g:each>

However I should mention that you should just send this down the initial call. Put the logic in a service to make it reusable.

Edit: Forgot it was a string

Upvotes: 3

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