Develop Reference

How to get JSON entry from returned objects

I got JSON data, like:
{
"id": 1,
"active": true,
"dependency": [
{ "id": 2 }
{ "id": 3 }
]
},
{
"id": 2,
"active": true
},
{
"id": 3,
"active": true
}
I want to retrieve the "active" value for each dependency in the id 1 object. So far I used a forEach to get those dependency.
thisElement.dependency.forEach(function(id) {
console.log(id)
}
Which returns id 2 and id 3 as objects. Is there a way to use id.active straight away? By using only one loop? Because the result so far are objects without any connection to the related JSON data. Would it require to loop through the whole JSON data to retrieve those values?

The most efficient thing to to is create a hashmap with an Object or Map first so you only need to iterate the array once to find dependency related values.
You could do it by using Array#find() to search whole array each time but that is far more time complexity than the o(1) object lookup
const activeMap = new Map(data.map(obj => [obj.id, obj.active]))
data[0].dependency.forEach(({id}) => console.log(id ,' active: ' , activeMap.get(id)))
<script>
const data =
[
{
"id": 1,
"active": true,
"dependency": [
{"id": 2 },
{"id": 3}
]
},
{
"id": 2,
"active": false
},
{
"id": 3,
"active": true
}
]
</script>

Dynamically add array elements to JSON Object

I'm creating a JSON object from an array and I want to dynamically push data to this JSON object based on the values from array. See my code for a better understanding of my problem...
for(i=0;i<duplicates.length; i++) {
var request = {
"name": duplicates[i].scope,
"id": 3,
"rules":[
{
"name": duplicates[i].scope + " " + "OP SDR Sync",
"tags": [
{
"tagId": 1,
"variables":[
{
"variable": duplicates[i].variable[j],
"matchType": "Regex",
"value": duplicates[i].scopeDef
}
],
"condition": false,
},
{
"tagId": 1,
"condition": false,
}
],
"ruleSetId": 3,
}
]
}
}
I take object properties from the duplicates array that can have the following elements:
[{scopeDef=.*, scope=Global, variable=[trackingcode, v1, v2]}, {scopeDef=^https?://([^/:\?]*\.)?delta.com/products, scope=Products Section, variable=[v3]}]
As you can see, an object contain variable element that can have multiple values. I need to push to the JSON object all those values dynamically (meaning that there could be more than 3 values in an array).
For example, after I push all the values from the duplicates array, my JSON object should look like this:
name=Products Section,
rules=
[
{
name=Products Section OP SDR Sync,
tags=[
{
variables=
[
{
matchType=Regex,
variable=v3,
value=^https?://([^/:\?]*\.)?delta.com/products
},
{
matchType=Regex,
variable=trackingcode,
value=.*
},
{
matchType=Regex,
variable=v1,
value=.*
},
{
matchType=Regex,
variable=v2,
value=.*
}
],
condition=false,
},
{
condition=false,
tagId=1
}
],
ruleSetId=3
}
]
}
I tried the following code but without success:
for(var j in duplicates[i].variable) {
var append = JSON.parse(request);
append['variables'].push({
"variable":duplicates[i].variable[j],
"matchType": "Regex",
"value": duplicates[i].scopeDef
})
}
Please let me know if I need to provide additional information, I just started working with JSON objects.

First of all, you dont need to parse request, you already create an object, parse only when you get JSON as string, like:
var json='{"a":"1", "b":"2"}';
var x = JSON.parse(json);
Next, you have any property of object wrapped in arrays. To correctly work with it you should write:
request.rules[0].tags[0].variables.push({
"variable":duplicates[i].variable[j],
"matchType": "Regex",
"value": duplicates[i].scopeDef
})
If you want to use your code snippet, you need some changes in request:
var request = {
"name": duplicates[i].scope,
"id": 3,
"variables":[
{
"variable": duplicates[i].variable[j],
"matchType": "Regex",
"value": duplicates[i].scopeDef
}
],
"rules":[
{
"name": duplicates[i].scope + " " + "OP SDR Sync",
"tags": [
{
"tagId": 1,
"condition": false,
},
{
"tagId": 1,
"condition": false,
}
],
"ruleSetId": 3,
}
]
}
}
To understand JSON remember basic rule: read JSON backward. It means:
property
object.property
arrayOfObfects['id'].object.property
mainObject.arrayOfObfects['id'].object.property
and so on. Good luck!

How merge two objects array in angularjs?

I want to append following object array with existing one in angulajs for implementing load more feature.
ie,appending AJAX response with existing one each time.
I have one variable, $scope.actions which contains following JSON data,
{
"total": 13,
"per_page": 2,
"current_page": 1,
"last_page": 7,
"next_page_url": "http://invoice.local/activities/?page=2",
"prev_page_url": null,
"from": 1,
"to": 2,
"data": [
{
"id": 2108,
"action_type_id": 202,
"user_id": 1
},
{
"id": 2108,
"action_type_id": 202,
"user_id": 1
}
]
}
I want to append following JSON response each time this variable.
{
"data": [
{
"id": 2108,
"action_type_id": 202,
"user_id": 1
},
{
"id": 2108,
"action_type_id": 202,
"user_id": 1
}
]
}
I have tried with $scope.actions.data.concat(data.data);
but it is not working and getting following error message
$scope.actions.data.concat is not a function

You can use angular.extend(dest, src1, src2,...);
In your case it would be :
angular.extend($scope.actions.data, data);
See documentation here :
https://docs.angularjs.org/api/ng/function/angular.extend
Otherwise, if you only get new values from the server, you can do the following
for (var i=0; i<data.length; i++){
$scope.actions.data.push(data[i]);
}

This works for me :
$scope.array1 = $scope.array1.concat(array2)
In your case it would be :
$scope.actions.data = $scope.actions.data.concat(data)

$scope.actions.data.concat is not a function
same problem with me but i solve the problem by
$scope.actions.data = [].concat($scope.actions.data , data)

Simple
var a=[{a:4}], b=[{b:5}]
angular.merge(a,b) // [{a:4, b:5}]
Tested on angular 1.4.1

Javascript looping through elements and adding to table

I'm having trouble finding a solution that will help me loop through a bunch of elements and putting the chosen values into a table. I've been able to withdraw some values but the method isn't dynamic.
Here is an example:
var Table = {
"credit": {
"link": "site link",
"logoUrl": "logo url",
"message": "message"
},
"groups": [
{
"labels": [
{
"name": "Western Conference",
"type": "conference"
},
{
"name": "Central Division",
"type": "division"
}
],
"standings": [
{
"stats": [
{
"name": "gp",
"value": 20
},
{
"name": "w",
"value": 17
},
{
"name": "l",
"value": 0
},
{
"name": "gf",
"value": 64
},
{
"name": "ga",
"value": 37
},
{
"name": "gd",
"value": 27
},
{
"name": "pts",
"value": 37
}
],
"team": {
"id": 12345,
"link": "team link",
"name": "team name",
"shortName": "team"
}
},
This is the structure of the elements. So far I've used this:
document.getElementById("sGamesPlayed").innerHTML=Table.groups[0].standings[0].stats[0].value;
to withdraw values. However there are more teams, stats and divisions so I would need some kind of loop to go through the elements and put the into a dynamic table.

I would consider you to look at http://underscorejs.org/.
it provides a bunch of utility functions that could help you,
for example, _.each() helps you loop through JSON properties.
for the sample objects you've given (after completing the missing brackets at the end),
_.each(Table.groups[0].standings[0].stats, function(stats){
console.log(stats['name']+","+stats['value'])
})
gives me:
gp,20
w,17
l,0
gf,64
ga,37
gd,27
pts,37
how it works is that you provide the object you want as the first argument and the function that you give as the second argument will be called with each element of the first argument (Assuming it is a list).
I would also urge you to look at underscore templating that you can use to render your table where i put the console.log :
http://net.tutsplus.com/tutorials/javascript-ajax/getting-cozy-with-underscore-js/
http://scriptble.com/2011/01/28/underscore-js-templates/

I guess your question is about filtering the values of the array standings. In order to do that you can use the jQuery grep function (if you want to use jQuery).
For example you can write:
var arr = $.grep(Table.groups[0].standings[0].stats, function(d){return d.value>25})
Which will give
arr = [{"name": "gf","value": 64}, {"name": "ga", "value": 37},{"name": "gd", "value": 27},{"name": "pts", "value": 37}]
If this is not what you meant, can you please create a jsFiddle with a sample of what you want?

Depending on what you want to do with the results, you can go over the object using a scheme like:
var groups, standings, stats, value;
groups = Table.groups;
// Do stuff with groups
for (var i=0, iLen=groups.length; i<iLen; i++) {
standings = groups[i].standings;
// Do stuff with standings
for (var j=0, jLen=standings.length; j<jLen; j++) {
stats = standings[j];
// Do stuff with stats
for (var k=0, kLen=stats.length; k<kLen; k++) {
value = stats[k].value;
// Do stuff with value
}
}
}
Of course I have no idea what the data is for, what the overall structure is or how you want to present it. But if you have deeply nested data, all you can do is dig into it. You might be able to write a recursive function, but it might also become very difficult to maintain if the data structure is complex.

How to retrieve value from json output?

I am new to json. I have json output that looks like this
[
{
"employees": {
"education": "BE\/B.Tech"
},
"0": {
"count": "1"
}
},
{
"employees": {
"education": "MBA"
},
"0": {
"count": "3"
}
}
]
I want to retrieve the employee's education and the count. I have tried but i am not able to retrieve the values.
I appreciate any help.
Thanks.

Assuming your JSON string is in a variable $json, it goes like this:
var employees_list = JSON.parse($json);
Then you can access the information via:
employees_list[0].employees.education // gives you "BE\/B.Tech"
// and
employees_list[0]["0"].count // gives you 1.
You can also loop over the array and access all the different education this way.
Update:
To better demonstrate which expression accesses which information:
[ // employees_list
{ // employees_list[0]
"employees": { // employees_list[0].employees
"education": "BE\/B.Tech" // employees_list[0].employees.education
},
"0": { // employees_list[0]["0"]
"count": "1" // employees_list[0]["0"].count
}
},
{ // employees_list[1]
"employees": { // employees_list[1].employees
"education": "MBA" // employees_list[1].employees.education
},
"0": { // employees_list[1]["0"]
"count": "3" // employees_list[1]["0"].count
}
}
]
Generally employees_list[0].employees is the same as employees_list[0]["employees"] but this does not work for numbers, because properties and variables are not allowed to start with numbers. So you can only use employees_list[0].["0"] and not employees_list[0].0.
The structure of your JSON string looks a bit strange though. You should consider to structure it differently if you can.
For example:
[
{
"education": "BE\/B.Tech",
"count": "1"
},
{
"education": "MBA"
"count": "3"
}
]
The "0" key in your original JSON string seems to serve no purpose and just complicates the access.