HTML5 sessionStorage and XMLDocument

Question

I want to store an XML document in sessionStorage. When I do this it seems to save ok as an XMLDocument. When I try to access it (on a page refresh) the object comes back as [object Object] as opposed to [object XMLDocument].

How do I get the data out of sessionStorage as an XMLDocument (or convert it to one?)

@FelixKling How do I convert from (jQuery) xml to a String and then back again? — Chris, Feb 15 '12 at 13:03

score 4 · Answer 1 · answered Feb 15 '12 at 13:10

4

You may want to serialize XMLDocument before saving it in storage:

var xml = new XMLSerializer().serializeToString(originalDom);
sessionStorage.setItem("myDocument", xml);

and then unserialize after loading data from storage:

var xml = sessionStorage.getItem("myDocument");
var restoredDom = new DOMParser().parseFromString(xml, "text/xml");

answered Feb 15 '12 at 13:10

Sergey Ilinsky

31,255
9
54
56

But new XMLSerializer().serializeToString(originalDom); not completely converting childs into proper string. – Mahesh Jan 02 '20 at 19:08

score 2 · Accepted Answer · edited May 23 '17 at 09:59

2

localStorage and sessionStorage can only hold strings. Have a look at the interface definition:

interface Storage {
  readonly attribute unsigned long length;
  [IndexGetter] DOMString key(in unsigned long index);
  [NameGetter] DOMString getItem(in DOMString key);
  [NameSetter] void setItem(in DOMString key, in DOMString data);
  [NameDeleter] void removeItem(in DOMString key);
  void clear();
};

You cannot store objects unless you serialize them. So in your case, you have to serialize it to XML.

If you received the XML document as text, just store it directly. You can use jQuery.parseXML() to parse it after retrieval.

edited May 23 '17 at 09:59

Community

1
1

answered Feb 15 '12 at 13:02

Felix Kling

795,719
175
1,089
1,143

`JSON.stringify()` is one possible method. – alex Feb 15 '12 at 13:04
How can I serialize my XML (using jQuery) to a String ? – Chris Feb 15 '12 at 13:05
1

@alex: Probably does not work with XMLDocument. I assume it as circular references. But for "plain objects" you are right. – Felix Kling Feb 15 '12 at 13:07
Thanks so far but how do I convert from jQuery XML document to XMLDocument? – Chris Feb 15 '12 at 13:09
for JSON, there is JSON.Stringify. There must be something similar for xml. – unludo Feb 15 '12 at 13:11
1

You should have a look at the documentation. There it states that `jQuery.parseXML()` returns an `XMLDocument`. – Felix Kling Feb 15 '12 at 13:13

HTML5 sessionStorage and XMLDocument

2 Answers2