javascript - Get element attribute names from JSON - Stack Overflow

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I'm trying to write a generic function that works with JSON arrays containing arbitrary attributes. Given the following:

var propMap = '{"ddColor": "Color","ddSize": "Size", "ddOther": "Other"}'

How can I iterate through the attributes and their values without specifying either? In other words, I want to iterate the elements without specifying "ddColor", "ddSize" or "ddOther". Yet, I want to iterate both the name and its value.

I've looked all over for a solution, but can't find one and also can't make it work on jsFiddle:

var propMap = '{"ddColor": "Color","ddSize": "Size"}'

for(var x in propMap) {
    // Key: x
    // Value: propMap[x]
    alert(x + ': ' + propMap[x]);
}

When I run the above code it seems to iterate character by character. Example:

1: C
2: o
3: l
4: o
5: r

I'm trying to write a generic function that works with JSON arrays containing arbitrary attributes. Given the following:

var propMap = '{"ddColor": "Color","ddSize": "Size", "ddOther": "Other"}'

How can I iterate through the attributes and their values without specifying either? In other words, I want to iterate the elements without specifying "ddColor", "ddSize" or "ddOther". Yet, I want to iterate both the name and its value.

I've looked all over for a solution, but can't find one and also can't make it work on jsFiddle:

var propMap = '{"ddColor": "Color","ddSize": "Size"}'

for(var x in propMap) {
    // Key: x
    // Value: propMap[x]
    alert(x + ': ' + propMap[x]);
}

When I run the above code it seems to iterate character by character. Example:

1: C
2: o
3: l
4: o
5: r

• javascript
• jquery
• json

Share Improve this question Follow edited Jul 1, 2012 at 23:56 rwkiii asked Jul 1, 2012 at 23:43 rwkiiirwkiii 5,8561919 gold badges6969 silver badges118118 bronze badges 3

• Just to be clear, there is no such thing as a JSON array. There are JSON strings, and they can represent arrays or objects. – Jonathan M Commented Jul 1, 2012 at 23:48
• I said you'll need to parse the JSON first if you haven't already, using jQuery.parseJSON. (See the bottom part of my answer, plus the jsFiddle.) – Ry- ♦ Commented Jul 1, 2012 at 23:58
• Thanks Jonathon. Wasn't sure about the right terminology. ;) – rwkiii Commented Jul 2, 2012 at 0:05

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1 Answer 1

Sorted by: Reset to default 5

Just use a for in loop:

for (var x in propMap) {
    if (propMap.hasOwnProperty(x)) {
        // Key: x
        // Value: propMap[x]
    }
}

And if that's actually a string, you'll need to parse the JSON first, of course:

propMap = jQuery.parseJSON(propMap);

Here's a jsFiddle, too.

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