Develop Reference

Manipulate Json String Jquery

Supposed that I have this JSON STRING that is stored in a vairable:
{"name":"Joene Floresca"},{"name":"Argel "}
How can I make it
["Joene", "Argel"]

You mention you have a string. Use JSON.parse for that. Also, make sure it is an array. Afterwards, you can manually iterate through each object in the array and push the value
var str = '[{"name": "Joene Floresca"},{ "name": "Argel "}]';
var objA = JSON.parse(str);
var values = [];
for (var i = 0; i < objA.length; i++) {
for (var key in objA[i]) {
values.push(objA[i][key]);
}
}
console.log(values);

Assuming your JSON is an array, you can use map:
// Your JSON string variable
var jsonString = '[{"name":"Joene Floresca"},{"name":"Argel "}]';
// Parse the JSON to a JS Object
var jsObject = $.parseJSON(jsonString);
// Use map to iterate the array
var arr = $.map(jsObject, function(element) {
// Return the name element from each object
return element.name;
});
console.log(arr); // Prints ["Joene Floresca", "Argel "]
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

You can iterate over objects inside array and store the names in a second array.
var data = JSON.parse('[{"name":"Joene Floresca"},{"name":"Argel "}]');
var names = [];
data.forEach(function(model) {
names.push(model.name);
});
// names now contains ["Joene Floresca", "Argel"]
alert(names);

How to convert Javascript array to JSON string

I have an array called values which has this data
var values=new Array();
values.push("english":"http://www.test.in/audio_ivrs/sr_listenglishMSTR001.wav");
values.push("kannada":"http://www.test.in/audio_ivrs/sr_listfrenchMSTR001.wav");
When I do JSON.stringify(values) I get values with square brackets, but I need a JSON string a shown below with urllist appended at the first.
{
"urlList":{
"english":"http://www.test.in/audio_ivrs/sr_listenglishMSTR001.wav",
"kannada":"http://www.test.in/audio_ivrs/sr_listfrenchMSTR001.wav"
}
}

Your code as you've defined it will give you errors. This is not valid JavaScript; you can't create an array element like this.
values.push("english":"http://www.test.in/audio_ivrs/sr_listenglishMSTR001.wav");
If you want the structure you've specified in your question then you'll need to use a nested object rather than an array to contain the key/value pairs.
var values = {
urlList: {}
};
values.urllist.english = "http://www.test.in/audio_ivrs/sr_listenglishMSTR001.wav";
values.urllist.kannada = "http://www.test.in/audio_ivrs/sr_listfrenchMSTR001.wav";
DEMO
HOWEVER...
Let's assume for a moment that what you meant to code was this (note the curly braces):
var values=new Array();
values.push({"english":"http://www.test.in/audio_ivrs/sr_listenglishMSTR001.wav"});
values.push({"kannada":"http://www.test.in/audio_ivrs/sr_listfrenchMSTR001.wav"});
This would tell me that you're pushing objects into an array which is perfectly valid JavaScript.
To get this information from the array into the structure you need you can use something like this loop:
var out = {
urlList: {}
};
for (var i = 0, l = values.length; i < l; i++) {
var el = values[i];
var key = Object.keys(el);
var value = el[key];
out.urlList[key] = value;
}
JSON.stringify(out);
DEMO

Returning only certain properties from an array of objects in Javascript [duplicate]

This question already has answers here:
From an array of objects, extract value of a property as array
(24 answers)
Closed 8 years ago.
If I have an object such that
var object = function(key,text)
{
this.key = key;
this.text = text;
}
And create an array of these objects
var objArray = [];
objArray[0] = new object('key1','blank');
objArray[1] = new object('key2','exampletext');
objArray[2] = new object('key3','moretext');
is there a way that I can retrieve only one of the properties of all of the objects in the array? For example:
var keyArray = objArray["key"];
The above example doesn't return set keyArray to anything, but I was hoping it would be set to something like this:
keyArray = [
'key1',
'key2',
'key3']
Does anyone know of a way to do this without iterating through the objArray and manually copying each key property to the key array?

This is easily done with the Array.prototype.map() function:
var keyArray = objArray.map(function(item) { return item["key"]; });
If you are going to do this often, you could write a function that abstracts away the map:
function pluck(array, key) {
return array.map(function(item) { return item[key]; });
}
In fact, the Underscore library has a built-in function called pluck that does exactly that.

var object = function(key,text) {
this.key = key;
this.text = text;
}
var objArray = [];
objArray[0] = new object('key1','blank');
objArray[1] = new object('key2','exampletext');
objArray[2] = new object('key3','moretext');
var keys = objArray.map(function(o,i) {
return o.key;
});
console.log(keys); // ["key1", "key2", "key3"]
JS Bin Example
http://jsbin.com/vamey/1/edit
Note that older browsers may not support map but you can easily do this with a for loop:
var keys = [];
for (var i = 0; i < objArray.length; i++) {
keys.push(objArray[i].key);
}
JS Bin Example
http://jsbin.com/redis/1/edit

You would want to do something like this:
objArray.map(function (obj) { return obj.key; });
Here is a JSFiddle to demo: http://jsfiddle.net/Q7Cb3/
If you need older browser support, you can use your own method:
JSFiddle demo: http://jsfiddle.net/Q7Cb3/1/
function map (arr, func) {
var i = arr.length;
arr = arr.slice();
while (i--) arr[i] = func(arr[i]);
return arr;
}

Well something has to iterate through the elements of the array. You can use .map() to make it look nice:
var keys = objArray.map(function(o) { return o.key; });
You could make a function to generate a function to retrieve a particular key:
function plucker(prop) {
return function(o) {
return o[prop];
};
}
Then:
var keys = objArray.map(plucker("key"));

Really "objArray" is an array that have 3 objects inside, if you want list of keys, you can try this:
var keys = [];
for(a in objArray) {
keys.push(objArray[a].key);
}
You have in var keys, the three keys.
Hope that helps! :)

How to convert a array containing object string to regular key object pair?

I am trying to convert my uri to object value, as a success level i converted and splited in to array values with colon. But i am not able to onvert those to regular object. any one suggest me a good way. I am suing underscorejs with me.
here is my code :
var ar = ["id:1231", "currency:GBP"];
var outPut = _.map(ar, function(item){
return '{' + item + '}';
})
console.log(outPut); //consoles as ["{id:1231}", "{currency:GBP}"]
how can i get result like this:
var object = {id:1231, currency:GBP}
is underscore has any in build method for this?

There are several ways you could go about this, and Underscore offers helpers for them.
One way would be to use _.reduce to incrementally add key/value pairs to an initially empty "result" object:
var obj = _.reduce(ar, function(result, item) {
var keyAndValue = item.split(":");
result[keyAndValue[0]] = keyAndValue[1];
return result;
}, {});
Note that you can do the same without Underscore unless you have to support IE 8 or earlier.

Without any third part library:
var output = {} ;
var ar = ["id:1231", "currency:GBP"];
ar.forEach(function (item) {
var values = item.split(':') ;
output[values[0]] = values[1] ;
}) ;
Output console.log(output):
Object {id: "1231", currency: "GBP"}

Here is another version using jQuery:
var newObj = {};
$.each( ar, function( i, v ) {
var kv = v.split( ":" );
newObj[ kv[0] ] = kv[ 1 ];
});
// newObj = {id:"1231", currency:"GBP"}

Simple way to import and export and store Arrays

For example I have something like this.
var Ar : Array;
Ar[0] = 'apple';
Ar[3] = 'pineapple';
Ar[12] = 'car';
Ar[33] = 'dog';
Ar[41] = 'cat';
Ar[21] = 'apple';
And I need to store it in simple text file. Like this
ArText : String ;
ArtText = "0-Apple,3-pineapple,12-car,33-dog,41-cat,21-apple"
You got the point.
What is best way to convert Array in to a readable string, and then back? Javascript code will be best, but you can use almost any similiar.

My initial impulse was to convert it directly to JSON, but then I realised that JSON.stringify() would return something like this:
["apple",null,null,"pineapple",null,null,null,null,null,null,null,null,"car",null,null,null,null,null,null,null,null,"apple",null,null,null,null,null,null,null,null,null,null,null,"dog",null,null,null,null,null,null,null,"cat"]
Because your array has a bunch of undefined slots that all become null because JSON doesn't support undefined values. Which would be OK if you just need to store it except then when you convert it back to an array you'd end up with nulls everywhere instead of undefined so you'd have to allow for that (not a big deal) but in any case it sounds like you want it to be human-readable too.
So instead I suggest you convert it to an object and then convert the object to JSON using JSON.stringify(). To convert it back you use JSON.parse() to turn your string into an object, then loop through the object properties to create a sparse array.
What I'm proposing would result in a JSON string like this:
{"0":"apple","3":"pineapple","12":"car","21":"apple","33":"dog","41":"cat"}
The code:
function sparseArrayStringify(arr) {
var obj = {},
i;
for (i=0; i < arr.length; i++)
if (typeof arr[i] != "undefined")
obj[i] = arr[i];
return JSON.stringify(obj);
}
function parseToSparseArray(str) {
var arr = [],
obj = JSON.parse(str),
k;
for (k in obj)
arr[k] = obj[k];
return arr;
}
var stringifiedArray = sparseArrayStringify(Ar); // where Ar is your array
// and change it back
var anArray = parseToSparseArray(stringifiedArray);
Working demo: http://jsfiddle.net/XXqVD/
Note: in my parseToSparseArray() function I didn't bother testing that the properties of the object in the string being parsed actually are non-negative integers, but you can add that if desired.
Newer browsers support the JSON object with associated methods, or for older browsers you can include the json2.js library.
By the way, the code in your question is invalid JavaScript: you can't declare variables with a type in JS. See the examples in my code for how to declare arrays, objects, etc.
EDIT: OK, I don't know why on earth you'd want the non-JSON version when JSON is a well known standard format, but here are some untested functions that read and write exactly the format from the question:
"0-Apple,3-pineapple,12-car,33-dog,41-cat,21-apple"
Note that your proposed format won't work if any of the array elements contain commas or hyphens. Which is why JSON is the way you should go. Anyway:
function serialiseArray(arr) {
var workingArray = [],
i;
for (i=0; i < arr.length; i++)
if (typeof arr[i] != "undefined")
workingArray.push(i + "-" + arr[i]);
return workingArray.join(",");
}
function deserialiseArray(str) {
var arr = [],
items = str.split(","),
item,
i;
for (i=0; i < items.length; i++) {
item = items[i].split("-");
arr[item[0]] = item[1];
}
return arr;
}

If it's just strings in the array, you could use the join() method on the Array object to create a comma separated string, and then use the split() method on the String object to convert the string back to an array.
var Ar = new Array;
Ar[0] = 'apple';
Ar[3] = 'pineapple';
Ar[12] = 'car';
Ar[33] = 'dog';
Ar[41] = 'cat';
Ar[21] = 'apple';
var stringRepresentation = Ar.join(",");
var backToArray = stringRepresentation.split(";");
You can see this working here; http://jsfiddle.net/ykQRX/. Note I've also fixed your invalid JavaScript (var Ar = new Array;).