convert List from JSON element to ArrayList using javascript

Question

I have a JSON object in session :

{ "Zone" : "Bangalore" , "Role" : "1" , "Vehicles" : [ "v123" , "v345" , "v567"]}

I need to get the values of Vehicles in ArrayList and pass to a selectBox with multiple option

Am trying something like this:

 var temp = sessionStorage.getItem('userDetails');
    var viewName = $.parseJSON(temp);
    alert(viewName.Vehicles);
    var v1 = new Array(viewName.Vehicles);
    for (var i=0; i < v1.length;++i){
        alert("");
        addOption(document.myform1.v1, v1[i], v1[i]);
        }

function addOption(selectbox,text,value )
{
    var optn = document.createElement("OPTION");
    optn.text = text;
    optn.value = value;
    selectbox.options.add(optn);
}

I am getting the values of

alert(viewName.Vehicles);

as v123,v234,v345. But I need to convert var veh as ArrayList to pass to the selectbox

The code to convert it to ArrayList is not working.

What you want do actully as v1 is an array already?

Suman Bogati
– Suman Bogati

2014-02-15 13:55:30 +00:00
Commented Feb 15, 2014 at 13:55 — Suman Bogati
– Suman Bogati, Commented Feb 15, 2014 at 13:55

Mehran Hatami · Accepted Answer · 2014-02-15 14:11:39Z

2

When you parse the your json, viewName.Vehicles is already an array.

for (var i=0; i < viewName.Vehicles.length;++i){
    addOption(document.myform1[viewName.Vehicles[i]], viewName.Vehicles[i], viewName.Vehicles[i]);
}

you can check it like:

Object.prototype.toString.call(viewName.Vehicles)

the result is:

"[object Array]"

or try:

viewName.Vehicles instanceof Array

edited Feb 15, 2014 at 14:11

answered Feb 15, 2014 at 13:54

Mehran Hatami

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5 Comments

user2093576 Over a year ago

but when i pass addOption(document.myform1.viewName.Vehicles, viewName.Vehicles[i], viewName.Vehicles[i]); It fails..

Mehran Hatami Over a year ago

@user2093576: I think what you want to do is document.myform1[viewName.Vehicles[i]]

Mehran Hatami Over a year ago

@user2093576: are these your field names "v123" , "v345" , "v567" ?

user2093576 Over a year ago

values of the key - "Vehicles" : [ "v123" , "v345" , "v567"]

user2093576 Over a year ago

You were absolutely right.. addOption(document.myform1.Vehicle_list, viewName.Vehicles[i], viewName.Vehicles[i]); working fine

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