I'm getting json_encode data from controller. The resulting array is like:

[
  { "name": "aaa" },
  { "name": "bbb" },
  { "name": "ccc" }
]

How to get the number of elements in this array using JavaScript?

I'm getting json_encode data from controller. The resulting array is like:

[
  { "name": "aaa" },
  { "name": "bbb" },
  { "name": "ccc" }
]

How to get the number of elements in this array using JavaScript?

• javascript
• jquery
• arrays
• json
• encode

• possible duplicate of Access / process (nested) objects, arrays or JSON – Qantas 94 Heavy Commented Feb 19, 2015 at 4:46
• 1 The newly-selected answer has nothing whatsoever to do with json. Please amend your question/title to remove all references to json if you wish to remain with that answer. Thank you. jsfiddle/wxbvbwtp/1 – cssyphus Commented Mar 12, 2015 at 15:15

5 Answers 5

You can always get array length by length property of an array.

Here is the reference from w3school:
http://www.w3schools./jsref/jsref_length_array.asp

Code:

function myFunction() {
  var fruits = ["Banana", "Orange", "Apple", "Mango"];
  document.getElementById("demo").innerHTML = fruits.length;
}

<p>Click the button to create an array, then display its length.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>

Try the working code in fiddle:
http://jsfiddle/5arrc15d/

You will have to use .length property of array to get number of items in array.

var arr=[{"name":"aaa"},{"name":"bbb"},{"name":"ccc"}];
alert(arr.length)

Here in alert you will get number of items in array arr.

You can get the number of elements in an array using yourArray.length.

You can use .length property in order to get no of elements in an array.

var x = '[{"name":"aaa"},{"name":"bbb"},{"name":"ccc"}]';
var y = $.parseJSON(x);

alert( y.length );

jsFiddle Demo

Best references:

https://developer.mozilla/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array

https://developer.mozilla/en/docs/Web/JavaScript/Reference/Global_Objects/JSON/parse

http://www.w3fools./

Notes:

1. Var x is not an array, it is a string -- a json string. Alerting x.length will return the length of the string, not the length of the array.

2. Var y has been parsed into a javascript array. y.length will return the number of items in the array.

3. You specifically asked about the length of a json array, so first you must parse the json into a javascript array.

jsFiddle parison