CODEWITHSUNDEEP
javascript
Jonathan Clark
Jonathan Clark

Reputation: 20538

Parsing an error message in JSON fails

Titanium SDK version: 1.6.1
iPhone SDK version: 4.2

I get this response back from the API I am consuming and I want a popup to show up on each error. For example: Desc can't be blank. I am using JavaScript.

This is the output in JSON.

{"desc":"can't be blank","value_1":"can't be blank"}

I tried this but it outputs every character, one by one.

for (var thekey = 0; thekey < response.length; thekey++) {

    alert(response[thekey]);

};

How can I output the errors?

Upvotes: 0

Views: 225

Answers (2)

Felix Kling
Felix Kling

Reputation: 816232

You have to first parse JSON into a JavaScript object, using JSON.parse:

response = JSON.parse(response);

The JSON object might not be available in older browsers, you have to include json2.js then.

You cannot use a normal for loop to iterate over an object. You have to use for...in:

for (var thekey in response) {
    if(response.hasOwnProperty(thekey)) {
        alert(response[thekey]);
    }
}

The properties of the object are desc and value_1, you cannot access them with numerical keys.

Upvotes: 1

takteek
takteek

Reputation: 7110

If the response is a string you'll need to decode it to an object before you can do anything with it. Right now you're just looping through a string and printing each character.

You'll also probably want to use

for (var key in responseObject) {
   var value = responseObject[key];
}

since it will be an object and your keys aren't numeric.

Upvotes: 1

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