javascript - How do we get index of select node in a extjs tree? -

on page have 2 trees. there form on page. 1 tree shown on page , inside form. have create trees below:

 var mytree1 = ext.create('ext.tree.panel', {     store: store,  //where store hardcoded json tree data     .... }); 

similarly mytree2 declared different store. shown inside form. when select on node on mytree2 , click on create button must able add new leaf node inside mytree1 @ same index.

help need are:
1. how index of selected node.
2. how go index in mytree1, should equal selected index mytree2.
3. how add leaf node @ specific index.

for reference:
ext js 4 treepanel documentation
ext js 4 nodeinterface documentation

1. the select event provides both index , record. if need general access it, mytree1.getselectionmodel().getselection() return array of records, can check against store index.

2. i'm assuming want compare selected records on both trees. given sample in #1, try this:

   var tree1rec = mytree1.getselectionmodel().getselection[0],     tree2rec = mytree2.getselectionmodel().getselection[0]; // perform comparison logic here // note if you're using 2 different stores, can't // equality test. you'll have compare // individual store values. 

3. nodes inserted relative existing nodes on tree. if have button click event:

   function onbuttonclick(button, eopts) {     var rec = mytree1.getselectionmodel().getselection[0];     if (rec) {         var childnode = rec.createnode(/* object here */);         rec.appendchild(childnode);     } } 

the details vary depending on actual data, general pattern.