javascript and json
I'm using javascript with a json library and running into a little trouble. Here's my json output:
{
"artist": {
"username": "myname",
"password": "password",
"portfolioName": "My Portfolio",
"birthday": "2010-07-12 17:24:36.104 EDT",
"firstName": "John",
"lastName": "Smith",
"receiveJunkMail": true,
开发者_如何转开发 "portfolios": [{
"entry": [{
"string": "Photos",
"utils.Portfolio": {
"name": "Photos",
"pics": [""]
}
},
{
"string": "Paintings",
"utils.Portfolio": {
"name": "Paintings",
"pics": [""]
}
}]
}]
}
}
In javascript I'm trying to access the entries in the map like so:
var portfolios = jsonObject.artist.portfolios.entry;
var portfolioCount = portfolios.length;
for ( var index = 0; index < portfolioCount; index++ )
{
var portfolio = portfolios[index];
txt=document.createTextNode("Portfolio Name: " + portfolio['string'] );
div = document.createElement("p");
div.appendChild ( txt );
console.appendChild(div);
}
but portfolios is "undefined". What's the correct way to do this?
Look at your JSON results. portfolios
is a one-element array; portfolios[0]
is an object containing a single key, entry
, which maps to an array of two objects that have both string
and utils.Portfolio
keys. Thus, the syntax jsonObject.artist.portfolios.entry
will not work. Instead, you want jsonObject.artist.portfolios[0].entry
.
If possible, I would suggest changing whatever code generates those JSON results to remove the entry
level of indirection entirely, e.g. like so:
{
"artist": {
/* ... */
"portfolios": [
{
"string": "Photos",
"utils.Portfolio": {
"name": "Photos",
"pics": [""]
}
},
{
"string": "Paintings",
"utils.Portfolio": {
"name": "Paintings",
"pics": [""]
}
}
]
}
}
Then you could access it with
var portfolios = jsonObject.artist.portfolios;
for (var i = 0, portfolio; portfolio = portfolios[i]; ++i)
{
// use portfolio variable here.
}
There is an array in your object. I believe you're looking for this:
var portfolios = jsonObject.artist.portfolios[0].entry;
The portfolios
property is an array, so you need to use an index to get the first element:
var portfolios = jsonObject.artist.portfolios[0].entry;
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