Re: How to get list of objects from JSON ??

IMHO Overlay types are so much better than this round about solution.

WHy cant your servlet just output JSON data instead of some script?

What you are doing manually, would have been done automatically if u used Overlay types.

Anyways, good you were able to sort this problem out.

Thanks,
Subhro.

On Tue, Oct 26, 2010 at 7:08 PM, Santosh kumar <kopp.sam@gmail.com> wrote:

Hi ,

Moitra and Thomas

Thanks for your reply.. !!
 
Anyways i got a solution..

use this code in the servlet ---
- get the list of products (productList) and use it in the servlet:
- This is JSON format to form a array of objects

        // Open the <script> tag
        writer.append("<script type=\"text/javascript\">");
        writer.append("var product=");
        writer.append("{productList: '[");
       
        Iterator<Product> iter = productList.iterator();
        while (iter.hasNext()) {
            Product product= iter.next();
            writer.append("{productName: \"" + Product .getProductName() +
                    "\", id: " + Product .getId() +
                    ", productDetails: \"" + Product .getProductDetails() +
                       .................................
                       ................................. 
                      "\"}");
            if (iter.hasNext()) {
                writer.append(",");
            }
        }
       
        // End the <script> tag
        writer.append("]'}; </script>");


use this code in the GWT onModule ---
- call the above servlet on onModule

        Dictionary product= Dictionary.getDictionary("product");
        String productListStr = product.get("productList").toString();
        JSONArray productJSONArray = JSONParser.parse(productListStr ).isArray();
        List<Product> ProductList = new ArrayList<Product>();
        for (int i = 0; i < productJSONArray .size(); i++) {
            JSONObject productJSONObject = (JSONObject)productJSONArray .get(i);
            Product product= new Product();
           
            JSONString productNameJSONString = productJSONObject .get("productName").isString();
            product.setProductName(productNameJSONString .stringValue());
           
            product.setId(Long.valueOf(productJSONObject .get("id").toString()));
           
            .........................
            .........................
            
            ProductList .add(product);
        }

finally we will get a list of objects. i.e, ProductList .

Guys its really cool concept .. !! enjoy it !! :-)

On Sat, Oct 23, 2010 at 7:21 PM, Subhrajyoti Moitra <subhrajyotim@gmail.com> wrote:

http://googlewebtoolkit.blogspot.com/2008/08/getting-to-really-know-gwt-part-2.htm

Use overlay types to read JSON arrays and objects.

Thanks,
Subhro.

On Sat, Oct 23, 2010 at 11:08 AM, Santosh kumar <kopp.sam@gmail.com> wrote:

Hi,

Using Dictionary in Gwt onModule load i want to get the list of objects from Json  ???

http://code.google.com/webtoolkit/articles/dynamic_host_page.html

The example in the above link it is shown for string, but i want to get the list of objects form the json ??
And also can you send me the sample code of JSON format for the list of objects(same as shown in the above example)
and also how to retrieve these objects in the gwt using Dictionary ?

please can anyone guide me ?

--
Thanks & Regards

S a n t o s h  k u m a r . k

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