Home > Uncategorized > jQuery 1.4.2 upgrade issue when doing json ajax calls

jQuery 1.4.2 upgrade issue when doing json ajax calls

The format requirement for ‘json’ dataType has changed slightly in the new jQuery 1.4.2: Double quotation marks are now a must (for both keys and values) to make ajax calls when specifying dataType: ‘json’ as the return data format. For example, the following json objects are no longer considered to be valid in jQuery 1.4.2:


Attempting to use the above not-strictly-valid json data will result in success option (function) in the ajax() to give up quietly. [ My test result, which is different to what the $.ajax page (http://api.jquery.com/jQuery.ajax/) states:

In jQuery 1.4 the JSON data is parsed in a strict manner; any malformed JSON is rejected and a parse error is thrown. (See json.org for more information on proper JSON formatting.)


It’s worth noting that 1.4.2 does not place a strict requirement on the json data being sent to the server, that is,
data: { userid: ‘Joe’, email: ‘joe@domain.com’ }
can still be used without causing problems.

[ edit: actually I was not correct about the last paragraph above – the “json data” being sent to the server is javascript object whose key should not be quoted. ]

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