Drag and drop function of tree in EXTJS4 (can be dragged between two trees) simple example _javascript technique

Copy Code code as follows:

As long as you want to configure the Viewconfig in the Treepanel, if it is between two trees, both trees have to be configured
viewconfig:{
Plugins: {
PType: ' Treeviewdragdrop ',
Appendonly:true//can only be dragged with non-leaf nodes
},
listeners:{//Listener
Drop:function (node,data,overmodel,dropposition,options) {
Ajax operations synchronize data to the backend database
Alert ("Put:" +data.records[0].get (' text ') + "move to:" +overmodel.get ("text"));
},
Beforedrop:function (node,data,overmodel,dropposition,dropfunction,options) {
if (Overmodel.get ("leaf")) {//target node
Overmodel.set (' leaf ', false);
//     }
}
}
}