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  1. #1
    Ext User
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    Question Problem getting JSON data in TreeLoader

    Problem getting JSON data in TreeLoader


    ---------------------------------------------
    dependency.js used from example in ExtJs
    --------------------------------------------

    // this is the source code tree
    var stree = new xt.TreePanel('source-files', {
    animate:true,
    loader: new xt.TreeLoader({dataUrl:'/IONSWeb/servlet/TaskManagementServlet'}),
    enableDrag:true,
    containerScroll: true
    });

    var croot = new xt.AsyncTreeNode({
    allowDrag:false,
    allowDrop:true,
    id:'croot',
    text:'Project Components',
    cls:'croot',
    loader:new Ext.tree.TreeLoader({
    dataUrl:'/IONSWeb/servlet/TaskManagementServlet',
    createNode: readNode
    })
    });

    ---------------------------------------------------
    Servlet Code
    -----------------------------------------------------

    logger.info("Creating JSON");

    JSONArray ewr =
    new JSONArray();
    JSONObject er=
    new JSONObject();
    er.put(
    "id " ,"100");
    er.put(
    "text","SITE RESEARCH ");
    er.put(
    "leaf","true");
    ewr.add(er);
    er=
    new JSONObject();
    er.put(
    "id " ,"200");
    er.put(
    "text","EQUIP RESEARCH ");
    er.put(
    "leaf","true");
    ewr.add(er);

    er=
    new JSONObject();
    er.put(
    "id","300");
    er.put(
    "text" ,"SITE CODE");
    er.put(
    "leaf","true");
    ewr.add(er);

    er=
    new JSONObject();
    er.put(
    "id","400");
    er.put(
    "text","EQUIPMENT VERIFICATION ");
    er.put(
    "leaf","true");
    ewr.add(er);
    er=
    new JSONObject();
    er.put(
    "id","500");
    er.put(
    "text","EQUIPMENT ORDER ");
    er.put(
    "leaf","true");
    ewr.add(er);

    responseString.append(ewr.toString());

    logger.info("Created JSON");



    logger.info("RS: "+responseString.toString());
    response.setContentType(
    "text/html");
    response.getWriter().write(responseString.toString());

    -----------------------------------------------------------------
    Servlet Output
    -----------------------------------------------------------------

    [{"text":"SITE RESEARCH ","id ":"100","leaf":"true"},{"text":"EQUIP RESEARCH ","id ":"200","leaf":"true"},{"text":"SITE CODE","leaf":"true","id":"300"},{"text":"EQUIPMENT VERIFICATION ","leaf":"true","id":"400"},{"text":"EQUIPMENT ORDER ","leaf":"true","id":"500"}]

    -----------------------------------------------------------------
    Jsp Code
    -----------------------------------------------------------------

    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
    <title>PROJECT VIEW </title>
    <script type="text/javascript" src="/IONSWeb/adapter/yui/yui-utilities.js"></script>
    <script type="text/javascript" src="/IONSWeb/adapter/yui/ext-yui-adapter.js"></script>
    <script type="text/javascript" src="/IONSWeb/resources/script/ext-all-debug.js"></script>

    <script type="text/javascript" src="/IONSWeb/adapter/ext/ext-base.js"></script>
    <script type="text/javascript" src="/IONSWeb/resources/script/ext-all.js"></script>
    <script type="text/javascript" src="/IONSWeb/resources/script/dependency.js"></script>
    <link rel="stylesheet" type="text/css" href="/IONSWeb/resources/css/ext-all.css">
    <link rel="stylesheet" type="text/css" href="/IONSWeb/resources/css/ytheme-vista.css">

    </head>
    <body>
    <div id="main-ct" style="width:700px;height:500px;"></div>
    <script>
    </script>

    </body>
    </html>

    -----------------------------------------------------------------
    Output of Jsp
    -----------------------------------------------------------------

    Empty tree with no data

    CAN ANYONE SUGGEST WHAT IS WRONG??

    THANKS A LOT


  2. #2
    Sencha - Training Team RWaters's Avatar
    Join Date
    Mar 2007
    Location
    Los Angeles, CA
    Posts
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    Default


    are you setting croot as the root node of your tree?

    Code:
    stree.setRootNode(croot);
    Also please remember Code tags

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