Question

I’m using javascript with backbone and adobe air. In my view model, I have a parse function where it saves the response( Dom object ), later on, when user hits saves, I want to add a couple of nodes to that saved response but I’m getting Dom exception 3, any help? Here are some code for reference.

parse: function(resp, xhr){
       this.treeDoc = xhr.responseXML
       //parse routine
      }

Somewhere down the road, when user wants to save

var xmlTree = createMyXML(); //creates a sub xml tree
this.treeDoc.appendChild(xmlTree ); //DOM Error 3 thrown

Any advice?

Answer 1

You are likely to have to call adoptNode first:

this.treeDoc.adoptNode(newElements);

Then append to a child node like:

this.treeDoc.documentElement.firstChild.appendChild(newElements);

Additionally if newElements is an array of new elements(like the name suggest) you will need to iterate through it.

See https://developer.mozilla.org/en/DOM/document for more info.

An answer to your comment(it was to large to be a comment it self):

Even if I didn’t reproduce the error I think I know why you are getting it. Error 8 is the code for NOT_FOUND_ERR. Guess you save the value of childNodes.length and iterate from 0(zero) to this value, what happens here is that the childNodes array is updated every time a child is added or removed, and then in some point in your loop i is actually greater than childNodes.length(but not greater that the saved value) causing childNodes[i] to return undefined. And because undefined is not a child of the referenced node the NOT_FOUND_ERR (code 8) is throw. To avoid this with minor changes to the code just iterates for the initial value of childNodes.length-1 to 0(zero), or just do:

while(node.childNodes.length > 0) node.removeChild(node.childNodes[0])