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Editorial Team
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Asked: 2026-06-18T04:56:52+00:00

I got this servlet which creates JSON data and I want to pass this

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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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1 Answer

  1. Editorial Team

    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. 🙂

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