Databases
StackOverflow2013
Postsdbo
POXPath/Javascript - INVALID_STATE_ERR when creating new nodes tree
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POXPath/Javascript - INVALID_STATE_ERR when creating new nodes tree
    primarykey
    data
    text
    <p>I'm currently playing arround with JS and the embedded XPath. I'm trying to create a little test script and found an interesting error which I'd like to understand. I'm calling the evaluate function like this:</p> <pre><code>var result = document.evaluate( xpath, document, null, XPathResult.ANY_TYPE); </code></pre> <p>In this case I get mixed results. The string, boolean and number types are no problem to handle but the UNORDERED_NODE_ITERATOR_TYPE is somehow tricky.</p> <p>My function to handle the result looks like that:</p> <pre><code> function nodes(iterator, parentNode) { var cur = iterator.iterateNext(); // do not touch! altering this object causes a INVALID_STATE_ERR Exception var myObj = cur == null || cur == undefined ? undefined : cur.cloneNode(true); var count = 0; while(myObj) { parentNode.appendChild(myObj); var = iterator.iterateNext().cloneNode(true); } } </code></pre> <p>But when I try to run this function I get an INVALID_STATE_ERR exception. But why? I do clone the objects and my parent node is a new created element node. (document.createElement('body') which should replace the original body node at the end.</p> <p>Do I need to create the new-body element in another way? Is this exception threwn because the new body element is attached to the current document tree? How could I do it if I can't use createElement?</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USschlingel
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POXPath/Javascript - INVALID_STATE_ERR when creating new nodes tree
      1. This table or related slice is empty.
      1. VTUpMod
    1. COConsider to post enough sample code allowing us to reproduce the problem, perhaps using a site like http://jsfiddle.net/. I am afraid a line like `var = iterator.iterateNext().cloneNode(true);` is not even syntactically correct. As for the XPath DOM API, consider to first iterate over the result to collect the nodes found, for instance in an array, then to manipulate the DOM tree. On the other hand a HTML document has exactly one `body` element, so why do you need to use an iterator? Shouldn't selecting a single node suffice?
      singulars
      1. POXPath/Javascript - INVALID_STATE_ERR when creating new nodes tree
      1. USMartin Honnen
    2. COI tried to morph your snippets into a test case to reproduce the issue, here it is: http://jsfiddle.net/pe95g/2/. I think that example should work fine and it indeed does so in Mozilla and Opera, yet in Chrome and Safari I get an "INVALID_STATE_ERR: DOM Exception 11". In my understanding that is a bug in WebKit's DOM implementation although the DOM Level 3 XPath note is not particularly detailed as to what is a "document modification" that "invalidates the iteration". If I change the code to use a snapshot (http://jsfiddle.net/WT5Uk/1/) it works fine with Mozilla, Opera, Safari, Chrome.
      singulars
      1. POXPath/Javascript - INVALID_STATE_ERR when creating new nodes tree
      1. USMartin Honnen
    3. COYou're right. I also tried this with snapshot but there I found another strange failure. When I use the evaluate function I use the definied function "evaluate( xpathExpression, contextNode, namespaceResolver, resultType, result );" in firefox but the same calling style leads to errors in chrome (15.0.874.106). There I have to call like that: "document.evaluate( xpath, document, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE)" Strange! But you're right the very same code from above runs in Firefox 7. (If you add your comment as answer I'll accept it because it helped me a lot)
      singulars
      1. POXPath/Javascript - INVALID_STATE_ERR when creating new nodes tree
      1. USschlingel
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload