从JSON对象检索值

Question

I have an xml file that has been converted to the json listed below. I have been trying to figure out how to retrieve -Name and -Value from each of the Attributes with no luck. I'm guessing I need to create a sub-object that is equal to jsonobj.Media.Attribute[i], but am unable to access -Name or -Value once I do that. Any suggestions?

jsonobj= {
      "Media": {
            "Attribute": [
              {
                "-Name": "Keywords",
                "-Value": "keyword value"
              },
              {
                "-Name": "Title",
                "-Value": "title value"
              },
              {
                "-Name": "Description",
                "-Value": "description value"
              },
              {
                "-Name": "Author",
                "-Value": "author value"
              },
              {
                "-Name": "Copyright",
                "-Value": "copyright value"
              }
            ]
          }
        };

Answer 1

This will alert all the values you're looking for:

var list = jsonobj.Media.Attribute
for(index in list)
{
    var obj = list[index];
    var name = obj["-Name"];
    var value = obj["-Value"];

    alert(name);
    alert(value);
}

Answer 2

Iterate jsonobj.Media.Attribute and use ['-Name'] to retrieve the value

for(var i = 0; i < jsonobj.Media.Attribute.length ; i++)
{
 var attr = jsonobj.Media.Attribute[i]
 alert(attr["-Name"]);
 alert(attr["-Value"]);
}

Answer 3

You can not use - in the code, cause it is an operator, and JS will not recognize it as a method.

To solve your problem you can access the properties using other way.

Otherwise your code: jsonobj.Media.Attribute[i].-Name

You can use: jsonobj.Media.Attribute[i].["-Name"]

What is the same from calling, for an example: jsonobj.["Media"].Attribute[i].["-Name"]

Answer 4

It can not identify key Attribute. Says can not read property 'Attribute' of undefined.