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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..

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..

  • javascript
  • json
  • jsp
  • servlets
Share Improve this question edited Jan 29, 2013 at 19:27 PogoMips asked Jan 29, 2013 at 19:22 PogoMipsPogoMips 3,7778 gold badges30 silver badges35 bronze badges 1
  • 2 Please don't swear on SO. I've removed the relevant for you this time. – T.J. Crowder Commented Jan 29, 2013 at 19:24
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2 Answers 2

Reset to default 7

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. :-)

You don't have to drop the JSON as a string - it's valid JavaScript syntax:

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

When that's rendered by JSP, the end result — the HTML sent to the browser — will be something like:

<body onload='init({"something": "some value", "whatever": "your data looks like"})'>

Now the only thing you may want to do is HTML encode the JSON, since you're dropping it as an HTML attribute value:

<body onload='init(${fn:escapeXml(jsonString)})'>

Then your "init" function can expect a ready-to-use JavaScript object, with no need to call a JSON parser at all.

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