iterate over json returned by success function

first off the error i get is "Uncaught TypeError: Cannot read property 'length' of undefined"
            i am using the following method to make a get request to a url
            now just for testing lets say vurl = "test.cfc?method=xyz&lnk=1&lnk2=abc"
            on success when i alert data i get: {"LNK2":"abc","_":1.332177382469E12,"LNK":1.0}
            so what am i doing wrong here?            
            $.ajax( {
                        type: "get",                        
                        url: vurl,                  
                        datatype: "json",
                        success: function(data) {
                              i've tried a variety of things here to loop through the json but get the error      

thanks ...
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Gurvinder Pal SinghCommented:
try this way

for ( key in data )
   alert( date[ key ] );
dgrafxAuthor Commented:
the code you posted loops over each character as in:



Gurvinder Pal SinghCommented:
first, tell me the output of


and then]

alert( typeof data );
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dgrafxAuthor Commented:
data = {"LNK2":"abc","_":1.332177382469E12,"LNK":1.0}
typeof = string

so how do i convert to json? i imagine thats the issue ...
the url does have returnformat=json
Gurvinder Pal SinghCommented:
got it!

before you run that for loop on this JSON, call this

data = eval (data);
dgrafxAuthor Commented:
i get Uncaught SyntaxError: Unexpected token :
Gurvinder Pal SinghCommented:
dgrafxAuthor Commented:
i ended up using:
$.each(data,function(ii,jj){ ..........

this works as expected (i believe)

is there code that says if the returned var is not an object to turn it into one?
thanks for your time
Greetings dgrafx,

First of all, eval is evil and should not be used in a real javascript application; there are many tricks that can allow you to have the same functionality without the security issues eval provides.

Second, alert is a bad way to debug an application. Use console.log instead, assuming you are using a modern browser it should be enough.

For instance:

success: function(data) {

Open in new window

If you already know the object and are $.each 'ing over it, then just do whatever you want for each element. For instance,

var o = [{name: 'jjperezaguinaga'}, {name: 'dgrafx'}, {name: 'john'}]

$.each(o, function(index, value) { // Use meaningful variable names ;)
    // $(this) can be used too...
    /* Your code here */
} );

Open in new window

For your question about the object, here's a nice trick to help you out

var name = || {}

Open in new window

This means that if we have a name in our object data, assign it, other wise, create an empty object. This a common javascript pattern that you get to see around many libraries :)

Last but not least, EE has a Code tag to help review code. Use it! :)

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