Develop Reference

Reading values from dictionary in Javascript

I am trying to read tags from a selected collection of bibliographic data in ZOTERO with Javascript.
For those who aren't familiar with ZOTERO: it has an in-built "run JS" panel to work directly with items selected / marked in the standalone version.
This is the script I am using to read data from a selected folder and access the tags:
var s = new Zotero.Search();
s.libraryID = ZoteroPane.getSelectedLibraryID();
var itemIDs = await s.search();
for (itemID of itemIDs) {
item = Zotero.Items.get(itemID);
return item;
itemTAG = item.getTags();
return itemTAG;
}
When I call return itemIDs; before the for loop, I get 4943 key:value pairs, which correctly mirrors the number of items in my collection.
The structure looks like this:
[
"0": 21848
"1": 21849
"2": 21850
"3": 21851
"4": 21852
"5": 21853
"6": 21854
"7": 21855
"8": 21856
"9": 21857
"10": 21858
]
What I would actually like to do is iterate through all IDs to get the bibliographic data for each item and return the tags.
This is why I first tried a for/in loop, but this didn't work, supposedly because I wasn't calling the key:value pairs (corresponding to a dictionary in Python?) correctly.
However, the above for/of loop works at least for the first item (item "0") and returns the following data:
{
"key": "BDSIJ5P4",
"version": 1085,
"itemType": "book",
"place": "[Augsburg]",
"publisher": "[Gabriel Bodenehr]",
"date": "[circa 1730]",
"title": "Constantinopel",
"numPages": "1 Karte",
"creators": [
{
"firstName": "Gabriel",
"lastName": "Bodenehr",
"creatorType": "author"
}
],
"tags": [
{
"tag": "Europa"
}
],
"collections": [
"DUW2PJDP"
],
"relations": {
"dc:replaces": [
"http://zotero.org/groups/2289797/items/ZB5J5VZK"
]
},
"dateAdded": "2019-02-13T17:27:29Z",
"dateModified": "2020-03-23T13:13:13Z"
}
So my two questions are:
How can I create a proper for/in loop that retrieves these same data for each item?
How can I return tags only? It seems that item.getTags() [which I used in analogy to the getNotes() examples in the documentation] may not be a valid function. Would that be specific to Zotero or Javascript in general?

Use map() to call a function on every array element and return an array of all the results.
return itemIDs.map(itemID => Zotero.Items.get(itemID).getTags())

How do I loop through a json array, and then display the results in an discord js embed?

Thanks for taking a peek at my question. This is my first question, so hopefully I do all the right stuff.
I am using DiscordJS/NodeJS
I have a large(ish) json file that has a list of maps/links to download the map, and an extra field.
[
{
"name": "2 Evil Eyes",
"link": "http://",
"extra": ""
},
{
"name": "25 To Life",
"link": "http://",
"extra": ""
},
{
"name": "Back To School",
"link": "http://",
"extra": ""
},
I created this file myself from a list that was given to me.
The goal of this file was to be able to display the data (maps, link, extra) in a discord embed. I know that having 70+ .addField(s) is not a great idea, but it is what was requested.
So I thought that I would just have a little loop through and display the data that way, but my issue is that it keeps posting an embed for each result it gets. Here is my code below:
fs.readFile('./maps.json', 'utf-8', function(err, data){
json = JSON.parse(data);
for(let i = 0; i < data.length; i++){
let name = data[i].name;
let link = data[i].link;
let extra = data[i].extra;
}
const mapRot = new Discord.MessageEmbed()
.setTitle("Map Details")
.setAuthor(client.user.username)
.setDescription("These are your maps for the night.")
.addField("Maps", name)
.addField("Link", link)
.addField("Extra", extra);
message.channel.send(mapRot);
Any help would be appreciated!

Welcome to StackOverflow! I'm not too familiar with the Discord API, however, it seems as though you can do something like this, where you pass to addFields a list of arguments.
So I would think you could first map through the array to transform the data, and then pass it in as it should be specified to addFields. Something along the lines of:
fs.readFile('./maps.json', 'utf-8')
.then(JSON.parse)
.then(data => data.map((entry) => {
// here, 'entry' stores an object of the form:
// {
// "name": "2 Evil Eyes",
// "link": "http://",
// "extra": ""
// }
// and per the Discord documentation, needs to return
// an object of the form:
// {
// "name": 'Inline field title',
// "value": 'Some value here'
// }
// for example:
return { name: entry.name, value: entry.value }
}))
.then((parsedEntries) => {
new Discord.MessageEmbed()
.setTitle("Map Details")
.setAuthor(client.user.username)
.setDescription("These are your maps for the night.")
.addFields(...parsedEntries)
// that last .addFields call is expecting parsedEntries to be of the form
// [{name: "field name", value: "field value"}, {name: "field2", value: "field2value"}]
})
Edit: essentially, you have a list of objects with properties that look like this:
{
"name": "2 Evil Eyes",
"link": "http://",
"extra": ""
}
But addFields takes objects with properties that look like this:
{
"name": "Field title"
"value": "Field value"
}
So you can use the JavaScript map function to map over each entry in the list, converting objects from your original format as specified in your maps.json file to the one that the Discord API requires.
Here's an article that might help introduce the essential concept of JavaScript mapping if you aren't previously familiar with it.

combining javascript object property value and display

Hi I am having difficulty in traversing in javascript object. How can I get scheme_name & NAV from both and store it in variable like "You have 2 schemes linked to your account. scheme_name1 NAV value is "" scheme_name2 NAV value is "" and so forth. Please explain it to me thanx
let data = [{
"CustomerID": 12345,
"NAV": "95.24059718",
"cost_of_purchase": 799900,
"folio_number": 10007060,
"id": 1,
"mutual_fund_house": "AXIS MUTUAL FUND",
"no_of_units": 15000,
"option": "GROWTH",
"plan": "REGULAR",
"resource_uri": "/api/v1/folio/1/",
"scheme_name": "AXIS LONG TERM EQUITY",
"value_of_units": "1428608.9580"
}, {
"CustomerID": 12345,
"NAV": "1053.31517400",
"cost_of_purchase": 1500000,
"folio_number": 5540000567,
"id": 2,
"mutual_fund_house": "SBI Mutual Fund",
"no_of_units": 2750,
"option": "DIVIDEND",
"plan": "DIRECT",
"resource_uri": "/api/v1/folio/2/",
"scheme_name": "SBI Magnum Multicap Fund",
"value_of_units": "2896616.7270"
}]

It looks like you try to map that object to another object.
First, try to read and understand array methods, you can check:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array
And for map method you can check:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map
And as a specific answer you can do:
const mappedData = data.map(function(item) {
return {
scheme_name: item.scheme_name,
NAV: item.NAV
};
});
This will return you an array of a simplified version of yours.
After that, you can convert it to a string like:
let solution = `You have ${mappedData.length} schemes linked to your account. `;
mappedData.forEach(function(mapped) {
solution += mapped.scheme_name + ' is ' + mapped.NAV + ' '
});
Note: I showed map method for giving an insight about what you can do, normally you don't need to simplify, you can directly use for each version.

Imagine each one of your objects (in this case you have provided two (2)) as an associative array inside of an array. Meaning that rather than reference it by it's index position, you can reference it by it's key.
This means to access object 1, you would have to write data[0]. But if you alerted this, this would simply tell you that data[0] is an object. Which is is.
To access an actual value in that array, you would then have to provide the key, which you can do by providing a number, or in your case perhaps more easily, it's associated key, which is "scheme_name".
See the following :
let data = [{
"CustomerID": 12345,
"NAV": "95.24059718",
"cost_of_purchase": 799900,
"folio_number": 10007060,
"id": 1,
"mutual_fund_house": "AXIS MUTUAL FUND",
"no_of_units": 15000,
"option": "GROWTH",
"plan": "REGULAR",
"resource_uri": "/api/v1/folio/1/",
"scheme_name": "AXIS LONG TERM EQUITY",
"value_of_units": "1428608.9580"
}, {
"CustomerID": 12345,
"NAV": "1053.31517400",
"cost_of_purchase": 1500000,
"folio_number": 5540000567,
"id": 2,
"mutual_fund_house": "SBI Mutual Fund",
"no_of_units": 2750,
"option": "DIVIDEND",
"plan": "DIRECT",
"resource_uri": "/api/v1/folio/2/",
"scheme_name": "SBI Magnum Multicap Fund",
"value_of_units": "2896616.7270"
}]
for (let i = 0; i < data.length; i++) {
alert(data[i]["scheme_name"]);
}
So quite simply, for i = 0, with i being less than the number of associative arrays in your array named data, alert the value on that indexed array, by the associated key.

You've got an array of data so firstly you need to iterate through that array.
Pick which properties you want to keep per record, and save them to a results array.
Once you have the results you can iterate through them and print out your individual records.
let data = [{"CustomerID":12345,"NAV":"95.24059718","cost_of_purchase":799900,"folio_number":10007060,"id":1,"mutual_fund_house":"AXIS MUTUAL FUND","no_of_units":15000,"option":"GROWTH","plan":"REGULAR","resource_uri":"/api/v1/folio/1/","scheme_name":"AXIS LONG TERM EQUITY","value_of_units":"1428608.9580"},{"CustomerID":12345,"NAV":"1053.31517400","cost_of_purchase":1500000,"folio_number":5540000567,"id":2,"mutual_fund_house":"SBI Mutual Fund","no_of_units":2750,"option":"DIVIDEND","plan":"DIRECT","resource_uri":"/api/v1/folio/2/","scheme_name":"SBI Magnum Multicap Fund","value_of_units":"2896616.7270"}]
let results = []
data.forEach(datum => {
results.push({
scheme_name: datum.scheme_name,
nav: datum.NAV,
})
})
console.log(`You've got ${results.length} items in your account.`)
results.forEach(result => {
console.log(`${result.scheme_name} - NAV value is: ${result.nav}`)
})

I created sample fiddle for you. You need to iterate over each object in your main object and store all information outside.
data.forEach(function(item) {
console.log(item.scheme_name);
});

Indexing array values in an object in an IndexedDB

For a Chrome app, wich stores data in IndexedDB, i have a object like this:
var simplifiedOrderObject = {
"ordernumber": "123-12345-234",
"name": "Mr. Sample",
"address": "Foostreet 12, 12345 Bar York",
"orderitems": [
{
"item": "brush",
"price": "2.00"
},
{
"item": "phone",
"price": "30.90"
}
],
"parcels": [
{
"service": "DHL",
"track": "12345"
},
{
"service": "UPS",
"track": "3254231514"
}
]
}
If i store the hole object in an objectStore, can i use an index for "track", which can be contained multiple times in each order object?
Or is it needed or possibly better/faster to split each object into multiple objectStores like know from relational DBs:
order
orderitem
parcel
The solution should also work in a fast way with 100.000 or more objects stored.

Answering my own question: I have made some tests now. It looks like it is not possible to do this with that object in only 1 objectStore.
An other example object which would work:
var myObject = {
"ordernumber": "123-12345-234",
"name": "Mr. Sample",
"shipping": {"method": "letter",
"company": "Deutsche Post AG" }
}
Creating an index will be done by:
objectStore.createIndex(objectIndexName, objectKeypath, optionalObjectParameters);
With setting objectKeypath it is possible to address a value in the main object like "name":
objectStore.createIndex("name", "name", {unique: false});
It would also be possible to address a value form a subobject of an object like "shipping.method":
objectStore.createIndex("shipping", "shipping.method", {unique: false});
BUT it is not possible to address values like the ones of "track", which are contained in objects, stored in an array. Even something like "parcels[0].track" to get the first value as index does not work.
Anyhow, it would be possible to index all simple elements of an array (but not objects).
So the following more simple structure would allow to create an index entry for each parcelnumber in the array "trackingNumbers":
var simplifiedOrderObject = {
"ordernumber": "123-12345-234",
"name": "Mr. Sample",
"address": "Foostreet 12, 12345 Bar York",
"orderitems": [
{
"item": "brush",
"price": "2.00"
},
{
"item": "phone",
"price": "30.90"
}
],
"trackingNumbers": ["12345", "3254231514"]
}
when creating the index with multiEntry set to true:
objectStore.createIndex("tracking", "trackingNumbers", {unique: false, multiEntry: true});
Anyhow, the missing of the possibility to index object values in arrays, makes using indexedDB really unneeded complicated. It's a failure in design. This forces the developer to do things like in relational DBs, while lacking all the possibilities of SQL. Really bad :(

Change in array format

I want to create a array structure with child entities like this ->
$scope.groups = [
{
"categories": [
{
"name": "PR",
"sortOrder": 0,
"type": "category"
}
],
"name": "DEPT 1",
"sortOrder": 0,
"type": "group",
"id": "-JY_1unVDQ5XKTK87DjN",
"editing": false
}
];
from an array that dosen't have child entities but all the items are listed in one object like this->
$scope.groups = [
{
"name": "PR",
"sortOrder": 0,
"type": "category"
},
{
"name": "AD",
"sortOrder": 3,
"type": "category"
},
{
"name": "DEPT 2",
"sortOrder": 1,
"type": "group",
"id": "-JYZomQKCVseJmaZoIF9",
"editing": false,
"categories": []
},
];
Is there any possible way?

As #Eagle1 has rightly pointed out. You need to define your data model properly to define a function that does that grouping for you. That said, from what I understand you have a $scope.groups array of objects for a specific department containing some categories which you need to consolidate as a child element.
You could start by defining a function that returns an object like you mention:
var organize = function(arr){
cats = [];
dep = {};
$.each( arr, function( i, val ) {
if(val.type == "category")
cats.push(val);
else
dep = val;
});
dep.categories = cats;
return dep;
}
Ultimately, you'll have to traverse the array and look for objects of type category and dump them in an array and have that array as the categories key of the object that you intend to return. I hope it gets you started in the right direction.

of course it is.
It's doable in javascipt although to help you devise something we would need a relationship between categories.
However, that's sounds like something that should be done in your data model (a relationship between dept - category, classic reflexive relationship parent - children). angular should be receiving from the back end an array already ordered.