Firstly, this is my json value i am getting from a php source:
[{"oid":"2","cid":"107"},{"oid":"4","cid":"98"},{"oid":"4","cid":"99"}]
After that, I want to get and oid value along with the corresponding cid value for example, oid=2 and cid=107 at one go, oid=4 and cid=98 at another and so on. I am trying to use jquery, ajax for this.
I have tried many answers for this, like: Javascript: Getting all existing keys in a JSON array and loop and get key/value pair for JSON array using jQuery but they don't solve my problem.
I tried this:
for (var i = 0; i < L; i++) {
var obj = res[i];
for (var j in obj) {
alert(j);
}
but all this did was to return the key name, which again did not work on being used.
So, you have an array of key/value pairs. Loop the array, at each index, log each pair:
var obj = [{"oid":"2","cid":"107"},{"oid":"4","cid":"98"},{"oid":"4","cid":"99"}];
for (var i = 0; i < obj.length; i++) {
console.log("PAIR " + i + ": " + obj[i].oid);
console.log("PAIR " + i + ": " + obj[i].cid);
}
Demo: http://jsfiddle.net/sTSX2/
This is an array that you have //lets call it a:
[{"oid":"2","cid":"107"},{"oid":"4","cid":"98"},{"oid":"4","cid":"99"}]
To get first element :
a[0] // this will give you first object i.e {"oid":"2","cid":"107"}
a[0]["oid"] // this will give you the value of the first object with the key "oid" i.e 2
and so on ...
Hope that helps.
`
Basically what you need is grouping of objects in the array with a property. Here I am giving two functions using which you can do this
// To map a property with other property in each object.
function mapProperties(array, property1, property2) {
var mapping = {};
for (var i = 0; i < data.length; i++) {
var item = data[i];
mapping[item[property1]] = mapping[item[property1]] || [];
mapping[item[property1]].push(item[property2]);
}
return mapping;
}
// To index the items based on one property.
function indexWithProperty(array, property) {
var indexing = {};
for (var i = 0; i < data.length; i++) {
var item = data[i];
indexing[item[property]] = indexing[item[property]] || [];
indexing[item[property]].push(item);
}
return indexing;
}
var data = [{
"oid": "2",
"cid": "107"
}, {
"oid": "4",
"cid": "98"
}, {
"oid": "4",
"cid": "99"
}];
var oidCidMapping = mapProperties(data, "oid", "cid");
console.log(oidCidMapping["2"]); // array of cids with oid "2"
var indexedByProperty = indexWithProperty(data, "oid");
console.log(indexedByProperty["4"]); // array of objects with cid "4"
May not be the exact solution you need, but I hope I am giving you the direction in which you have to proceed.
If you are willing to use other library you can achieve the same with underscorejs
Related
When reading a csv into a javascript dictionary, how can I concatenate values of what would otherwise be duplicate keys? I've seen answers for how to do this with bash, c#, and perl, but I haven't been able to find answers for Javascript. Here's what I have:
var subjects = {};
d3.csv("test.csv", function(data) {
for (var i = 0; i < data.length; i++)
{
subjects[data[i].Id] = data[i].VALUE;
}
console.log(subjects);
});
This, obviously writes over existing keys. Instead, I want the key to be an array of the values. The csv basically looks like:
Id, VALUE
id1, subject1
id2, subject1
id1, subject3
And I want to output as:
{"id1": ["subject1", "subject3"], "id2": ["subject1"]...}
Just check if your output already has the key, if so you add the new value to the array. Else you create an array.
d3.csv("test.csv", function(data) {
var subjects = {};
for (var i = 0; i < data.length; i++)
{
// Check if key already exists
if(subjects.hasOwnProperty(data[i].Id)){
// push data to array
subjects[data[i].Id].push(data[i].VALUE);
}else{
// create new key and array
subjects[data[i].Id] = [data[i].VALUE];
}
}
console.log(subjects);
});
You could make it into an array and then push the content into that array
var subjects = {};
d3.csv("test.csv", function(data) {
for (var i = 0; i < data.length; i++)
{
//first time we see this id, turn it into an array
if(typeof subjects[data[i].Id] != "object"){
subjects[data[i].Id] = [];
}
//push content to the array
subjects[data[i].Id].push(data[i].VALUE);
}
console.log(subjects);
});
Try this inside the for loop:
typeof subjects[data[i].Id] == 'undefined' && (subjects[data[i].Id] = []);
subjects[data[i].Id].push(data[i].VALUE);
You can reduce the footprint of your code slightly if you use reduce:
var out = data.reduce((p, c) => {
const id = c.Id;
p[id] = p[id] || [];
p[id].push(c.VALUE);
return p;
}, {});
RESULT
{
"id1": [
"subject1",
"subject3"
],
"id2": [
"subject1"
]
}
DEMO
The following is the data from the source file:
{
"dubbuseqchapter+block#a7a5931f68d0482eaff2b7c9f9684e47": {
"category": "chapter",
"children": [
"dubbuseqsequential+block#968513c8f0cc4249b7cfc2290ac967dc",
"dubbuseqsequential+block#f7f730a478144a74bd127f996d6dc4f5",
"dubbuseqsequential+block#91a0d5d7cd9649a3bdf057400e0a1c96",
"dubbuseqsequential+block#28b2b171b6734b13af29735796c5ad5a",
"dubbuseqsequential+block#192a150c8aab43b9bd236773ba60b414",
"dubbuseqsequential+block#26b3464dad42460ea66f9afe89770065"
],
"metadata": {
"display_name": "Introduction course orientation"
}
},
"dubbuseqchapter+block#b2451e9195c5466db8b66f53ed06c9fd": {
"category": "chapter",
"children": [
"dubbuseqsequential+block#c95826a16f71405ba58319d23d250fc4",
"dubbuseqsequential+block#fe4e3b8b7cdd4fa0b9fe9090223b7125",
"dubbuseqsequential+block#44bbdee625dc465ebe725d2126ed0662",
"dubbuseqsequential+block#8d4daba07d4443f3b2a0b2506280ee2c",
"dubbuseqsequential+block#c68d9d3ba7de45b1b0770085e4f1f286",
"dubbuseqsequential+block#ccdca5b2aca94dbdabb3a57a75adf3fa"
],
"metadata": {
"display_name": "Module closing section"
}
}
}
The following javascript brings the top key values (i.e dubbuseqchapter+block#a7a5931f68d0482eaff2b7c9f9684e47,dubbuseqchapter+block#b2451e9195c5466db8b66f53ed06c9fd )
Javascript code
var obj = JSON.parse(jContent);
var keys = Object.keys(obj);
for (var i = 0; i < keys.length; i++) {
var row = createRowCopy(getOutputRowMeta().size());
var idx = getInputRowMeta().size();
row[idx++] = keys[i];
// Alert (keys.length);
putRow(row);
}
However, I am unable to get the values of the keys..(i.e. Category, Children and metadata) in this example.
I have tried Objects.values() but it returns null or object object in the Alert.
keys is an array of strings, each string being a property name.
You get the value for a property name in the usual way:
object[property_name]
i.e.
var value = obj[keys[i]];
this code shows how to navigate into parsed JsonData
var obj = JSON.parse(textJson);
var keys = Object.keys(obj);
console.log(obj[keys[0]].metadata.display_name);
this will print : Introduction course orientation
Or even this way to retrieve your subProperties
var obj = JSON.parse(textJson);
var keys = Object.keys(obj);
for (var i = 0; i < keys.length; i++){
console.log(keys[i]);
var subKeys = Object.keys(obj[keys[i]]);
for (var j = 0; j < subKeys.length; j++) console.log(subKeys[j] + " --> " + obj[keys[i]][subKeys[j]]);
}
I want to iterate over my 'areasarray' in the array 'areas' dataprovider array,
I have no idea how to loop over an array in an array, I've tried several tries with for-loops but none of it succeeded.
this is amCharts Maps framework.
var areasarray = {};
//get JSON File
$(function getData() {
var url = "../assets/document.json";
$.ajax({
url: url,
dataType: 'json',
success: function (data) {
console.log(data);
for (var i = 0; i < data.fact.length; i++) {
if (inverseCountryCodes[data.fact[i].dims.COUNTRY] != null) {
areasarray[i] = {
"id": inverseCountryCodes[data.fact[i].dims.COUNTRY],
"value": data.fact[i].Value,
"info": "Verkeersdoden per 100 000 inwoners: " + data.fact[i].Value
}
}
}
//console.log(areasarray);
//Map initialiseren
var map;
map = new AmCharts.AmMap();
map.colorSteps = 20;
var dataProvider =
{
mapVar: AmCharts.maps.worldLow
areas: [
{
id: "BE",
value: 10,
info: "Verkeersdoden ..."
}
]
};
console.log(dataProvider);
map.areasSettings = {
autoZoom: true,
selectedColor: "#338DAB"
};
map.dataProvider = dataProvider;
var valueLegend = new AmCharts.ValueLegend();
valueLegend.right = 10;
valueLegend.minValue = "little";
valueLegend.maxValue = "a lot!";
map.valueLegend = valueLegend;
map.addListener("clickMapObject", function (event) {
document.getElementById("info").innerHTML = '<p><b>' + event.mapObject.title + '</b></p><p>' + event.mapObject.info + '</p>';
});
map.mouseWheelZoomEnabled = true;
map.write("mapdiv");
}
});
});
If you want to iterate over areasarray which is actually an object and not an array you should look into using a for...in loop
For iterating over arrays within arrays, one approach would be to nest for loops
for(var i = 0; i < array1.length; i++) {
for(var j = 0; j < array2.length; j++) {
// do something
}
}
It's not clear to me what you mean by "array in an array" in this context and it would help if you provided more information about what exactly you are trying to accomplish
I would try a nested loop. Here is an example of creating an array of arrays and then looping through each.
var matrix = []
matrix[1] = []
matrix[1][1] = "foo"
matrix.forEach(function(column){
column.forEach(function(cell){
console.log(cell);
});
});
var areasarray = {}; means it's an object, not an array.
To iterate through each items in this object, try this.
var keys = Object.keys(areasarray);
keys.forEach(function(k) {
// you can access your item using
// k is the property key
console.log(areasarray[k]);
console.log(areasarray[k].id);
console.log(areasarray[k].value);
console.log(areasarray[k].info);
});
Not sure why you chose to create areasarray as an object.
If you wanted to, you could have defined it as:
var areasarray = [];
Then when adding to the array you use:
areasarray.push({
"id": inverseCountryCodes[data.fact[i].dims.COUNTRY],
"value": data.fact[i].Value,
"info": "Verkeersdoden per 100 000 inwoners: " + data.fact[i].Value
});
So later on, you can simply do:
for (var i = 0; i < areasarray.length; i++) {
console.log(areasarray[i]);
console.log(areasarray[i].id);
console.log(areasarray[i].value);
console.log(areasarray[i].info);
}
Note: in the above code, i is an index, where in the object block code, k is a key to the object.
Use nested loops.
Example:
var a1=["1","2","3","4","5","6","7"];
var a2=["a","b","c","d","e"];
for(var i=0;i<a1.length;i++) //loop1
{
console.log(a1[i]);
for(var j=0;j<a2.length;j++) //loop2
{
console.log(a2[j]);
}
}
Sample Output:
1st iteration of loop1:
1abcde
2nd iteration of loop1:
2abcde
and so on...
For every iteration of loop1,loop2 iterates 4 times(j<5).
Hoping I got your question right...This could be an answer.!
I have a javascript object with 6 key value pairs:
My_Type_1:"Vegetable"
My_Type_2:"Fruit"
My_Type_3:"Dessert"
My_Value_1: "Carrot"
My_Value_2: "Apple"
My_Value_3: "Cake"
I want to construct JSON out of the above object such that it generates the following:
[{"Vegetable":"Carrot"},{"Fruit":"Apple"},{"Dessert":"Cake"}]
EDIT:
for (j=0;j<3;j++)
{
var tvArray = new Array();
var sType = 'My_Type_'+j+1;
var sValue = 'My_Value_'+j+1;
tvArray['Type'] = JSObject[sType];
tvArray['Value'] = JSObject[sValue];
}
The json.stringify doesn't produce the desired output as listed above.
How do I do this?
Thanks
You need to put parenthesis around j + 1. What you have now gives you 'My_Type_01' and so on.
var obj = {
My_Type_1:"Vegetable",
My_Type_2:"Fruit",
My_Type_3:"Dessert",
My_Value_1: "Carrot",
My_Value_2: "Apple",
My_Value_3: "Cake"
};
var pairs = [], pair;
for(var j = 0; j < 3; j++) {
pair = {};
pairs.push(pair);
pair[obj['My_Type_' + (j+1)]] = obj['My_Value_' + (j+1)];
}
console.log(JSON.stringify(pairs));
Help needed.
I have string like ["wt=WLw","V5=9jCs","7W=71X","rZ=HRP9"] (unlimited number of pairs)
I need to make an array with pair like wT (as index) and WLw as value, for the whole string (or simpler wT as index0, WLw as index 1 and so on)
I'm trying to do it in JavaScript but I just cant figure out how to accomplish this task.
Much much appreciate your help!!
You cannot have a string as an index in an array, what you want is an object.
All you need to do is loop over your array, split each value into 2 items (key and value) then add them to an object.
Example:
// output is an object
var output = {};
var source = ["wt=WLw","V5=9jCs","7W=71X","rZ=HRP9"];
for (var index = 0; index < source.length; index++) {
var kvpair = source[index].split("=");
output[kvpair[0]] = kvpair[1];
}
If you wanted an array of arrays, then its much the same process, just pushing each pair to the output object
// output is a multidimensional array
var output = [];
var source = ["wt=WLw","V5=9jCs","7W=71X","rZ=HRP9"];
for (var index = 0; index < source.length; index++) {
output.push(source[index].split("="));
}
Update If your source is actually a string and not an array then you will have to do a little more splitting to get it to work
var output = {};
var sourceText = "[\"wt=WLw\",\"V5=9jCs\",\"7W=71X\",\"rZ=HRP9\"]";
// i have escaped the quotes in the above line purely to make my example work!
var source = sourceText.replace(/[\[\]]/g,"").split(",");
for (var index = 0; index < source.length; index++) {
var kvpair = source[index].split("=");
output[kvpair[0]] = kvpair[1];
}
Update 2
If your desired output is an array of arrays instead of an object containing key-value pairs then you will need to do something like #limelights answer.
Object with Key-Value pairs: var myObject = { "key1": "value1", "key2": "value2" };
with the above code you can access "value1" like this myObject["key1"] or myObject.key1
Array of Arrays: var myArray = [ [ "key1", "value1"] ,[ "key2", "value2" ] ];
with this code, you cannot access the data by "key" (without looping through the whole lot to find it first). in this form both "key1" and "value1" are actually values.
to get "value1" you would do myArray[0][1] or you could use an intermediary array to access the pair:
var pair = myArray[0];
> pair == ["key1", "value1"]
> pair[0] == "key1"
> pair[1] == "value1"
You can use a for each loop on both types of result
// array of arrays
var data = [ [ "hello", "world"], ["goodbye", "world"]];
data.forEach(function(item) {
console.log(item[0]+" "+item[1]);
});
> Hello World
> Goodbye World
// object (this one might not work very well though)
var data = { "hello": "world", "goodbye": "world" };
Object.keys(data).forEach(function(key) {
console.log(key+" "+data[key]);
});
> Hello World
> Goodbye World
The normal for loop would do perfectly here!
var list = ["wt=WLw","V5=9jCs","7W=71X","rZ=HRP9"];
var pairs = [];
for(var i = 0; i < list.length; i++){
pairs.push(list[i].split('='));
}
This would give you an array of pairs, which I assume you want.
Otherwise just get rid of the outer Array and do list[i].split('=');
If you want it put into an object ie. not an Array
var pairObject = {};
for(var i = 0; i < list.length; i++){
var pair = list[i].split('=');
pairObject[pair[0]] = pair[1];
}