Question

We have used JSO for our JSON parsing in GWT client side. Now, we need to convert our Java objects to JSON string. I just wanted to understand, how we can achieve this? JSO overlay types was used for JSON parsing. Can it also be used to create a JSON request string or do we have to go by some other means?

Answer 1

Generating a JSON object in JavaScript is pretty simple. You can do it like this:

var obj = { "var1": "hello", "var2": "world" };

this will generate a JSON object with two varibles (“var1” and “var2”) with their values (“hello”, “world”).
The Object can be converted into a String (for sending purposes) with the JSON.stringify(jso); method.

Generating JSON data from the java code isn’t possible (well not with a usefull result) since all varibles are optimzed to single Strings, so applying this method wouldn’t hava a usefull result (if even possible).

If you have already a JSO object (generated with something like safeeval). You can edit your varibles there, like this:

public final native void newValue(String newValue) /*-{
    this.ValueName = newValue;
}-*/;

If you then want the object as string you have to define the following method in your JSO class:

    public final native String returnAsString () /*-{
    return JSON.stringify(this);
}-*/;

or use this in you Java class: String s = (new JSONObject(jso)).toString();.

This way you can edit your original intput data and send the original object back to the server.

BR