Hi,
I am using the dhtmlxtree professional version 1.6. I am using the tree in my project and i would like to catch the event when a modification is made on a node. I have read through the documentation and i implemented as follows:
tree.attachEvent(“onEdit”,onNodeEdit); //call onNodeEdit function
function onNodeEdit(state,id,tree,value)
{
switch (state) {
case 0: return true;
break
case 1:
break
case 2: return true;
break
case 3: xmlhttprequest(); //call xmlhttprequest function
break
default:
}
}
function xmlhttprequest()
{
var myXmlStr = tree.serializeTree();
var xmlhttp=false;
/@cc_on @/
/@if (@_jscript_version >= 5)
// JScript gives us Conditional compilation, we can cope with old IE versions.
// and security blocked creation of the objects.
try {
xmlhttp = new ActiveXObject(“Msxml2.XMLHTTP”);
} catch (e) {
try {
xmlhttp = new ActiveXObject(“Microsoft.XMLHTTP”);
} catch (E) {
xmlhttp = false;
}
}
@end @/
if (!xmlhttp && typeof XMLHttpRequest!=‘undefined’) {
try {
xmlhttp = new XMLHttpRequest();
} catch (e) {
xmlhttp=false;
}
}
if (!xmlhttp && window.createRequest) {
try {
xmlhttp = window.createRequest();
} catch (e) {
xmlhttp=false;
}
}
// the following code, redirects to a java class Save which contains the method to save the serialized tree in DB
xmlhttp.open(“POST”, “mainservlet?cl=save.Save&method=saveDhtmlxtree”,true);
xmlhttp.onreadystatechange=function() {
if (xmlhttp.readyState==4) {
}
}
xmlhttp.setRequestHeader(“Content-Type”, “text/xml”)
xmlhttp.send(myXmlStr);
}
The behavior from the above code is not what i was expecting.
What is supposed to do is. when ever the node is edited and not yet closed (case:3), the tree should be serialized into a var and saved to the DB. I have narrowed down the point where the error occurs and it points to the serializer.
var myXmlStr = tree.serializeTree();
what could be wrong with the serializer???
Can any one point out where i am making the mistake or any other way to find when a node is edited so that the DB can be updated with the latest version of the tree.
Thanks in advance
choe 
The problem caused by recursive calls, in moment when you call serializeTree the edit operation not fully finished yet, so
- call serializeTree
- tree code stop edit before serialization
- call of onEdit event
- call serializeTree
… infinite recursive loop…
To resolve issue, just call you code a moment after edit operation
case 2: return true;
break
case 3:
window.setTimeout(xmlhttprequest,1);
break