How to pass Json Code in Java to Javascript

Question

Im trying to pass a Collection of items converted into String with JsonArray to my Javascript but dont work.

This is the code of the class

    InformeAmenazasAGR = manager.preparaInformeRiesgoActivos(idDimension, tipoActivo, idActivo, tipoActivoTexto, nombreActivo, recursos);       

    JSONArray JSonArray = new JSONArray();      
    JSonArray.put(InformeAmenazasAGR);
    String texto = JSonArray.toString();
    //Delete the first and last char.
    texto = texto.substring(1, texto.length()-1);   

    request.setAttribute("InformeAmenazasAGR", texto);
    return mapping.findForward( "informeActivosAGR" );

This returns one String like this:

[
["16","E.1","Errores de los usuarios","7","1128750","1015875"],
["20","E.5","Deficiencias en la organización","7","752500","526750"],
]

My JSP with Javascript (im using ExtJS and follow I tried Passing a Java string to Javascript post but dont work)

var DatosAmenazas = new String("<%request.getAttribute("InformeAmenazasAGR");%>");
var amenazaStore = Ext.create('Ext.data.Store', {
    model: 'Amenazas',
    data: DatosAmenazas     
});

What am i doing wrong? Thank you in advance

EDIT: If i put the raw String that i save in request.setAttribute("InformeAmenazasAGR", texto); it works:

var amenazaStore = Ext.create('Ext.data.Store', {
    model: 'Amenazas',
    data: [
           ["16","E.1","Errores de los usuarios","7","1128750","1015875"],
           ["20","E.5","Deficiencias en la organización","7","752500","526750"],
          ]
    });

VPK · Accepted Answer · 2014-09-18 03:35:05Z

1

I think using the Java scriptlet inside javascript is not good practice,

instead you can use the $(InformeAmenazasAGR) to set the request attribute value to a hidden element and put the hidden element anywhere inside your html <body> like this,

<input type="hidden" id="jsonData" value="${InformeAmenazasAGR}">

then, get the hidden element value like,

var DatosAmenazas = new String($('#jsonData').val());

if you need the request attribute InformeAmenazasAGR to be converted into json data then instead of above you can change your above line as,

var DatosAmenazas = JSON.parse($('#jsonData').val());

FYI: Java scriptlets run on server side while javascript on client side

edited Sep 18, 2014 at 3:35

answered Sep 17, 2014 at 13:17

VPK

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2 Comments

S. Moreno Over a year ago

I dont understand at all (sorry, im new with js). i added the line <input type="hidden" id="jsonData" value="${InformeAmenazasAGR}"> before the <script> and the var DatosAmenazas = new String($('#jsonData').val()); before the amenazaStore but now the page is white without load anything. i added a little description more in the question. Thank you.

VPK Over a year ago

@S. Moreno do not put the hidden element before the '<script>' tag but instead put it anywhere in your html '<body>' tag. Also try printing the value of variable 'DatosAmenazas' using 'alert(DatosAmenazas);' after you initialize it. See the updated answer.

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