包含键值对javascript的数组

Question

So I have this "story" array:

 story[0]=[{"_ref":"/hierarchicalrequirement/15475417305","FormattedID":"US79832","Owner":"A","EstCP":0}]
 story[1]=[{"_ref":"/hierarchicalrequirement/15790056238","FormattedID":"US81776","Owner":"B","EstCP":0}]
 story[2]=[{"_ref":"/hierarchicalrequirement/15790059145","FormattedID":"US81777","Owner":"C","EstCP":7.5}]

How do I get the "FormattedID" key of story[2]? I tried:

1. story[2].get("FormattedID")
2. story[2].FormattedID
3. story[2]["FormattedID"]
4. story[2][FormattedID]
5. story[2].getCollection("FormattedID")
6. story[2].get(FormattedID)

None of these works. Any help would be appreciated. Thanks.

Answer 1

story[2] is an array with just one entry. You access that entry via [0] . That object has the property, so:

story[2][0].FormattedID

...gives you the value.

This may be clearer with some linebreaks. Here's what you're assigning to story[2] :

story[2]= [ // <== Starts array
    {       // <== Starts object
        "_ref": "/hierarchicalrequirement/15790059145",
        "FormattedID": "US81777",
        "Owner": "C",
        "EstCP": 7.5
    }       // <== Ends object
];          // <== Ends array

So story[2][0] gives us the object:

{
    "_ref": "/hierarchicalrequirement/15790059145",
    "FormattedID": "US81777",
    "Owner": "C",
    "EstCP": 7.5
}

...which has the FormattedID property. You can access that using dot notation and a literal property name ( .FormattedID ), or using bracketed notation and a string property name ( ["FormattedID"] ).

Answer 2

Remove the brackets when you are creating your story objects. Then you can get to it as you expect.

Example:

 story[0]={"_ref":"/hierarchicalrequirement/15475417305","FormattedID":"US79832","Owner":"A","EstCP":0}

story[0].FormattedID

With the brackets you are actually creating an array with one item at each spot in your main array.