Tree Javascript And Menu Add Items

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I am having some difficulty dynamically adding items to a tree javascript and menu.

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Q: I am having some difficulty dynamically adding items to a tree javascript and menu.

I have a menu with one "root" item. I see the use of the "+" symbol within the item name. I do not see any documentation regarding this symbol, only "|". Can you explain?

If I have one menu with this one "root" node, how would I add an subitem to this root node?

Here is my code so far, but the inserted items appear to be at the same level as the root node.

var rootItem = dtreet_ext_getItemIDByIndex ( 0,0 );

var menuItem = new Array(10);
for ( var i = 0; i < producers.length; i++ )
{
var producer = producers[ i ];
menuItem[0] = producer.name;

dtreet_ext_insertItem ( 0, 0, i + 1, menuItem );

A: See dtreet_ext_insertItem () function has the following parameters:

function dtreet_ext_insertItem (menuInd, parentItemID, itemInd, itemParams)

Creates a new item and inserts it into a specified position.
menuInd - index of a javascript and menu on a page, >= 0.
parentItemID - ID property of an item.<, >= 0.
itemInd - index of a new item within the javascript and menu, >= 0.
itemParams - item parameters.

Notice that parentItemID is the Id property of the parent item (not index). If you want to add top items you should set parentItemID=0.

itemInd - you should use this parameter if you want to add item in the specific place, for example set itemInd=5 if you want to add item before the existing item with itemInd=5.
If you set itemInd=null the new item will be added at the end of this submenu and its index will be added automatically.

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