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Nested set tree view data structure using with recursing and traversal techniques in MongoDB or JavaScript

Hey I'm trying to implement nested drag&drop within re-order sequencesin my MERN app. I working to find ideal approach for mongodb data model and implement to Lexicographic order or linked lists for infinite sub folders. I used Model Tree Structures in this link but every node have limitless children for that require recursion and recursive functions or currying. Documentations not clear enough for make do that.
I want show all tree once and not sohuld appear after than click to arrow icon.There is my doodles for front side generation that working with only one depth such like graph nodes. Maybe Modified Preorder Tree Traversal implementation examples you have for this scenario.
const tree = data => { // immutable array
let ascendants = data.filter(d=>d.parent==null)
let descandants = data.filter(d=>d.parent)
**strong text**
let form = []
ascendants.map(a=>{
let node1 = {...a}; /// copying
let node1Children = [];
descandants.map(b=>{
let node2 = {...b};
if(node1._id == b.parent){
node1Children.push(node2)
}
})
node1.children = node1Children;
form.push(node1);
})
return form;
}
I cant take result with using $graphLookup because list format is not what i want.Could you give me some mongodb playground or grouping aggregate solutions? Below json examples shown my expecting results. I can do before but hardcode is unapropriate and performless. Is comparing good way?
[
// mongo database
{_id:123, title:'Books', slug:'books', parent:null },
{_id:124, title:'Programming', slug:'programming', parent:null },
{_id:125, title:'JavaScript', slug:'javascript', parent:'programming' },
{_id:126, title:'C++',slug:'cpp', parent:'programming' },
{_id:127, title:'React', slug:'react', parent:'javascript' },
{_id:128, title:'Redux', slug:'redux', parent:'react' },
{_id:129, title:'Toolkit', parent:'redux' },
{_id:130, title:'Saga', parent:'redux' },
{_id:131, title:'Nodejs', parent:'programming' },
{_id:132, title:'Databases', slug:'databases' },
{_id:133, title:'MongoDB', parent:'databases' },
]
[
// what i want
{ title: "Books"},
{ title: "Programming", parent:"computer-science", children: [
{ title: "JavaScript", children: [
{ title: "React", children: [
{ title: "Redux", children: [
{ title: "Saga" },
{ title: "Thunk" },
{ title: "Mobx" },
{ title: "Observable" },
{ title: "Context" },
{ title: "GraphQL" },
{ title: "Toolkit", children:[
{ title: "typescript" },
{ title: "slices", children:[
{ title: "createAsyncThunk" },
{ title: "createSlice" },
] },
] },
] },
{ title: "Nextjs" },
]},
{ title: "Vue", },
{ title: "angular", },
]},
{ title: "C++", },
{ title: "NodeJS", },
] },
{ title: "MongoDB", parent: "databases"},
]

You could create a Map to key your objects by slug. The values per key will be the result objects for parent objects. Include an entry for null, which will collect the top-level elements.
Then iterate the data again to populate children arrays -- when that property does not exist yet, create it on the fly. Finally output the top-level elements.
function makeTree(data) {
let children = []; // Top-level elements
let map = new Map(data.map(({title, slug}) => [slug, { title }]))
.set(null, {children});
for (let {slug, parent, title} of data) {
(map.get(parent || null).children ??= [])
.push(slug ? map.get(slug) : {title});
}
return children;
}
// Your mongodb data:
const data = [{_id:123, title:'Books', slug:'books', parent:null },{_id:124, title:'Programming', slug:'programming', parent:null },{_id:125, title:'JavaScript', slug:'javascript', parent:'programming' },{_id:126, title:'C++',slug:'cpp', parent:'programming' },{_id:127, title:'React', slug:'react', parent:'javascript' },{_id:128, title:'Redux', slug:'redux', parent:'react' },{_id:129, title:'Toolkit', parent:'redux' },{_id:130, title:'Saga', parent:'redux' },{_id:131, title:'Nodejs', parent:'programming' },{_id:132, title:'Databases', slug:'databases' },{_id:133, title:'MongoDB', parent:'databases' }];
console.log(makeTree(data));

ArcGIS API for Javascript: FeatureLayerCollection doesn't displaye all the features

This image shows the result of my implementation.
The problem here is the feaure layer displayed in the map shows only one of the features passed in the code.
How have I done it?
Create a feature layer using new FeatureLayer(featureCollectionObject, options?).
Create a Query and QueryTask to request features from the arcgi server.
var selectQuery: Query = new Query();
selectQuery.returnGeometry = true;
selectQuery.where = "1=1";
selectQuery.outFields = ["NAME", "X", "Y"];
var queryTask_XZQH = new QueryTask(FL_XZQH_URL);
queryTask_XZQH.execute(selectQuery);
Define a event handler for "complete" of queryTask.
function onQueryTask_XZQHComplete(evt: object) {
console.log(evt.featureSet.geometryType);
//console.log(evt.featureSet);
FL_XZQH = new FeatureLayer({
featureSet: evt.featureSet,
layerDefinition: {
geometryType: "esriGeometryPolygon",
className: "xzqh",
objectIdField:"OBJECTID",
fields: [
{
name: "OBJECTID ",
type:"esriFieldTypeOID",
alias:"OBJECTID"
},
{
name: "ID ",
type:"esriFieldTypeInteger ",
alias:"Id"
},
{
name: "Name",
type: "esriFieldTypeString",
length: 50,
alias: "行政区划名称"
},
{
name: "X",
type: "esriFieldTypeDouble",
alias: "经度"
},
{
name: "Y",
type: "esriFieldTypeDouble",
alias: "纬度"
}
]
}
});
map.addLayer(FL_XZQH);
}
The result of QueryTask is fine, and the count of the features is 18.
However, when I use map.addLayer, the map just displays one feature.

The feature layer does not have a valid object ID. Make two changes to fix it:
Change this:
selectQuery.outFields = ["NAME", "X", "Y"];
To this (i.e. include the object ID in your query):
selectQuery.outFields = ["OBJECTID", "NAME", "X", "Y"];
Change this:
{
name: "OBJECTID ",
type:"esriFieldTypeOID",
alias:"OBJECTID"
},
To this (i.e. remove the space at the end of the field name):
{
name: "OBJECTID",
type:"esriFieldTypeOID",
alias:"OBJECTID"
},
Note: this will only work if the feature service actually has a field called OBJECTID.

Adding an item to the top of a Dojo Select dijit, but can't select the second item

I have two Select dijits that are based off the same data store. The first dijit is the required response and the second dijit is an optional response. For the second dijit, I want to add the additional item "None" to the top of the list. However, when I do that, I cannot select the second item in the list. In this JSBin, if you select "General lakebed mapping" in the second dijit, the returned value is the added item "None".
require(["dijit/form/Select",
"dojo/data/ObjectStore",
"dojo/store/Memory",
"dojo/domReady!"
], function (Select, ObjectStore, Memory) {
var data = [
{ id: 0, label: 'General lakebed mapping' },
{ id: 1, label: 'Bathymetry/Digital Elevation Model' },
{ id: 2, label: 'Ferrous object detections/magnetic anomalies' },
{ id: 3, label: 'Ground-truth data' },
{ id: 4, label: 'Lakebed color' },
{ id: 5, label: 'Lakebed surface type, hardness/smoothness/slope' },
{ id: 6, label: 'Sub-bottom geology' }
];
var store = new Memory({
data: data
});
var os = new ObjectStore({ objectStore: store });
var s = new Select({
store: os,
sortByLabel: false
}, "target");
s.startup();
data.unshift({ id: -1, label: 'None' })
store.setData(data);
var s1 = new Select({
store: os,
sortByLabel: false
}, "target1");
s1.startup();
s1.on("change", function () {
console.log("my value: ", this.get("value"))
});
})

Do not use the value 0 as an id. It is a falsey value in JavaScript and I suspect that the Select dijit source treats it somewhere as false and fails. Just use another value in its place.

Filter Json in Code AngularJS

Hello I have the following JSONs
$scope.Facilities=
[
{
Name: "-Select-",
Value: 0,
RegionNumber: 0
},
{
Name: "Facility1",
Value: 1,
RegionNumber: 1
},
{
Name: "Facility2",
Value: 2,
RegionNumber: 1
},
{
Name: "Facility3",
Value: 3,
RegionNumber: 2
}
];
$scope.Regions=
[
{
Name: "-Select-",
RegionNumber: 0
},
{
Name: "USA",
RegionNumber: 1
},
{
Name: "Mexico",
RegionNumber: 2
}
];
I would have two DropdownLists in my app which will have one of these Jsons assigned to it.
Whenever you select a Region, a ng-change would be triggered. What I want, is to make the Facility DDL to update it's values. It would only show the Facilities which have a RegionNumber equivalent to the selected Region's RegionNumber.
How could I achieve this? I'm using Angular JS, MVC...
Note: The -Select- Value must always appear, even if it's value is zero and is not equivalent to the selected Region.

While a data structure, like greengrassbluesky may simplify the result, you can accomplish the same thing with an onchange that leverages javascript filtering
$scope.Facilities = masterFacilities.filter(function (el) {
return regionNumber = el.RegionNumber == $scope.SelectedRegion || el.RegionNumber == 0;
});
Here's a fiddle with an example using your lists.

I think you need a data structure like below:
$scope.Regions=
[
{
Name: "-Select-",
facilities : {
facilityId: 1,
facilityName: "facility1"
},
{
facilityId: 2,
facilityName: "facility2"
}
},
{
Name: "USA",
facilities : [{
facilityId: 1,
facilityName: "facility1"
},
{
facilityId: 2,
facilityName: "facility2"
}]
},
];
So, you could reference them like below:
For the dropdown of Regions, you can iterate through above Data structure.
Store the selectedRegion in selectedRegion
Then use that for the dropdown for facilities.

Tree is not displayed propery in DOJO

I am new to DOJO 1.6
I trying to display tree with sub folders.
dojo.require("dojo.data.ItemFileWriteStore");
dojo.require("dijit.form.Button");
dojo.require("dijit.tree.TreeStoreModel");
dojo.require("dojo.store.Memory");
dojo.require("dijit.Tree");
dojo.addOnLoad(function() {
// Create test store, adding the getChildren() method required by ObjectStoreModel
var data = [ { id: 1, name: "answerTypeLabel", type:'scenario', children:[{_reference: 2}]},
{ id: 2, name: "acceptRequestLabel", type:'paragraph', data: "acceptRequestLabel"},
{ id: 3, name: "rejectRequestLabel", type:'scenario', children:[{_reference: 5},{_reference: 6}]},
{ id: 4, name: "MoreInformationLabel", type:'scenario', children:[{_reference: 7},{_reference: 8}]},
{ id: 5, name: "rejectRequestStatusLabel", type:'paragraph', data: "rejectRequestStatusLabel"},
{ id: 6, name: "rejectRequestNotCoveredLabel", type:'paragraph', data: "rejectRequestNotCoveredLabel" },
{ id: 7, name: "MoreInformationDocumentLabel", type:'paragraph', data: "MoreInformationDocumentLabel"},
{ id: 8, name: "MoreInformationDataLabel", type:'paragraph', data: "MoreInformationDataLabel"}
];
// Building the store object
var sortableStore = new dojo.data.ItemFileWriteStore({
data: {
identifier: 'id',
label: 'name',
items: data
},
});
// building the model
var model = new dijit.tree.ForestStoreModel({
store: sortableStore,
query: {
id: "*"
},
rootId: "root",
rootLabel: "sorting of tree"
});
// Building the tree
var tree = new dijit.Tree({
model:model,
'class': "tundra"
},
"resourceTree");
});
.
Here Id 2 in a child of Id 1 , so while displaying Id 2 must be inside Id 1.
But here Id 2 appears inside id 1 and also on the same level of id 1.(There is a duplication of all the all the child ids ).
This is case with id 2,5,6,7,8.
I want to remove the duplication.
Ouptput should be like

Reason is that you apply a non-hierachial store onto a tree which is not supposed to display items that has parents as a sibling to the root.
To 'fix' this, the referenced id's needs to not get matched by the model query.
In your case of data, it looks like the type:'paragraph' is supposed to be leaves. Therefore set the query to match type:'scenario' as opposed to your current ' id: "*" '
var model = new dijit.tree.ForestStoreModel({
store: sortableStore,
query: {
type:'scenario'
},
rootId: "root",
rootLabel: "sorting of tree"
});