json.stringify generates "null" value for strings which have "" value in IE8

[drcoelho]

Given a javascript object (returned from a dijit/Form) that contains one or more string values, each of which has an empty value, e.g. "" and each of which is typeof == "string", the stringify method is returning a value of "null".

This occurs only on IE8 (version 8.0.6001.18702).

This seems to be something peculiar to the objects returned by dijit/Form.

Oddly, the following kludge fixes the issue:

var form = registry.byId('my_form').get('value');
// at this point form['mystr'] has a value of ''
// and JSON.stringify(form) returns '{"mystr":"null"}'

// but if we do the following:
for (var key in form) {
  if ( (typeof form[key] == "string") && (form[key] == '') ) {
    form[key] = '';
  }
}

// now it works!!!
// and JSON.stringify(form) returns '{"mystr":""}'

[freddefisk]

I have also experienced this issue with Internet Explorer 8, but without using the dijit/Form. I think I got this weird empty string value when simply calling get("value") on a ValidationTextBox?.

Can you also reproduce this with a simple example without dijit/Form?

[bill]

You didn't attach a test case so I tried dijit/tests/form/test_Form_state.html. It works fine for me:

>>JSON.stringify(dijit.byId("form1").get("value"))
"{"name":"","birth":"2000-01-01T00:00:00Z","notes":""}"

My IE version is also 8.0.6001.18702, and I'm running on Windows XP.