Large Tree How to handle

Submitted by dinobhai on Wed, 03/12/2008 - 11:11.

I have a fairly large tree with around 10,000 nodes.

i want to display this and am building JSOn from a servlet for it. but the time to render this tree is too long
is there a way say i can only render the top level of the tree and then render nodes as they are clicked instead of building the whole tree... can i modify the tree widget somehow or is there some attribute for this functionality please help

Dino

Login or register to post comments
Unsubscribe post

QueryReadStore

Submitted by trutwijd on Wed, 03/12/2008 - 11:46.

If you user a QueryReadStore you can take the approach of loading the top level nodes, then re-query for each child as it's expanded - I describe the approach I took on this forum post (make sure to read all comments):

http://www.dojotoolkit.org/forum/dijit-dijit-0-9/dijit-support/dijit-tre...

Josh

getting into infinite loop

Submitted by fabricas on Wed, 03/19/2008 - 16:28.

I've tried out your code with minor changes but the store/tree object fall into an infinite loop:

-Server X
-C:/Pubblica
-Server X
-C:/Pubblica
-Server X
-C:/Pubblica
...

This is the code:

if (parentItem == null) {
// get top level nodes for this id
foldersStore.fetch({serverQuery:{levels:0},onComplete: onComplete});
} else if (foldersStore.getValue(parentItem, 'type')=='environment'){
foldersStore.fetch({serverQuery:{env: foldersStore.getValue(parentItem, 'name')}, onComplete: onComplete});
} else {
foldersStore.fetch({serverQuery:{levels:1,path: foldersStore.getValue(parentItem, 'path')}, onComplete: onComplete});
}

and these are the JSON contents for the 1^ call (TOP_ITEM) and the 2^ call (FIRST_CHILD) :

TOP_ITEM: {"items":[{"id":"env0","desc":"SVILUPPO","name":"Server X","path":"","children":[{"id":"unknown1","name":"C:/Pubblica","path":"C:/Pubblica","type":"unknown"}],"type":"environment"}],"label":"name","identifier":"id"}
FIRST_CHILD: {"items":[{"id":"folder0","name":"Pubblica","path":"C:/Pubblica","children":[],"type":"folder"}],"label":"name","identifier":"id"}

Any suggestion about this?

Thanks a lot

Bye

Fabrizio

hi fabrizio! i have the same

Submitted by claudette on Mon, 04/28/2008 - 07:50.

hi fabrizio!
i have the same problem! did you solve it already?
would you please give me a hint or something?

thanks a lot!

claudette

limitation

Submitted by dinobhai on Thu, 03/13/2008 - 15:04.

thanks for replying josh, i have a limitation of using only 0.9 build of dojo :-(

I thought of using get children but that does not result in an XHR call ... can u help out as to how to get JSON from server... currently i am using an out.println(myjsonString); the string is autogenerated. but goes upto 1.5 MB thus to load such a string in a single XHR call takes lot of time.

I thought of splitting this by only fetching the parents first and then each child on clicking of the parent but i will have to code a lot of seperate xhr calls for that i think....i dont have much exp of dojo please help out...

do i have to do this manually using dojo.get etc.. or is there a way around...

Thanks in advance dino

Search