Question

119

passing json data from servlet to jsp to js file

rated 0 times [ 122] [ 3] / answers: 1 / hits: 18703 / 12 Years ago, tue, january 29, 2013, 12:00:00

I got this servlet which creates JSON data and I want to pass this data on to a jsp page which is supposed to display the data via the InfoVis toolkit.

servlet.java

JSONObject json = new JSONObject();

    JSONArray toplevel = new JSONArray();

    JSONObject sublevel;



    try{



        json.put(id, node + 0);

        json.put(name, name + 0);



        int count = 5;

        for(int i=1; i < count; i++){

            sublevel = new JSONObject();

            sublevel.put(id, node + i);

            sublevel.put(name, name + i);

            toplevel.put(sublevel);

        }

        json.put(children, toplevel);

    } catch (JSONException jse) {



    }



    request.setAttribute(jsonString, json.toString());

    RequestDispatcher dispatcher = request.getRequestDispatcher(graph.jsp);

    dispatcher.forward(request, response);

The following Code is provided by the InfoVis Toolkit and I'm not sure if it can be changed. Or at least I don't have enough experience in JS to change it.

graph.jsp

<body onload=init('${jsonString}');>

spacetree.js

function init(jsonString){



    var json = jsonString;

Originally the function call is only

<body onload=init()>

but the init() function has the JSON variable hardcoded, which is of course not useful at all. So I'm looking for a way to make that dynamic. But since theres quotations inside the string it now totally messes up the onload=init() function call..

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kalli

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2 Years ago

answered 12 Years ago tobyl · Accepted Answer

The cheap and easy way is to modify the JSP so it outputs this:

<script>

var theData = ${jsonString};

</script>

<body onload=init(theData);>

The downside to that is that it creates a global variable, but if you're calling init in that way, init is already a global, so that ship has sailed. :-)