check whether json data array is empty or not

Question

This is my ajax code, I need to check whether json data has an array or not? How can I? I have tried this but yet it shows me wrong output.

$.ajax({
        url: url,
        type: 'POST',
        data: {'data': data},
        dataType: "json",
        success: function (data) {
          if(data)
          {
            console.log('data is there');
          }
          else
          {
            console.log('data is not there'); 
          }

This is response I am giving in return to ajax.

<?php
$json_data_array = '[]';
return $json_data_array;
?>

How can I check?

JSON.parse(data).length

Filnor
– Filnor

2017-11-09 07:34:47 +00:00
Commented Nov 9, 2017 at 7:34 — Filnor
– Filnor, Commented Nov 9, 2017 at 7:34

Suren Srapyan · Accepted Answer · 2017-11-09 07:35:06Z

2

You need to check it's length. Array in condition if(array) is true when it has no items.

if([]) {
    console.log('True');
}

Check the length property

if([].length) {
   console.log('True');
}

edited Nov 9, 2017 at 7:35

answered Nov 9, 2017 at 7:34

Suren Srapyan

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2 Comments

Jaymin Over a year ago

Thanks which will be good options length or normal [] this for checking?

Suren Srapyan Over a year ago

Depends on your logic. If empty array is ok (considering to be true) for you, use the first, if not - the second

Faizan Fayaz · Accepted Answer · 2017-11-09 07:45:17Z

1

In javascript you can check the length

  var size= myarray.length;
    if(size>=1) 
    {
       alert("not empty");
    }
    else
    {
        alert("empty");
    }

In php you can check with the following method

if(!empty($myarray))
{
    echo "Not Empty";
}
else
{
    echo "Empty";
}

answered Nov 9, 2017 at 7:45

Faizan Fayaz

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Comments

Bhatia Gaurav · Accepted Answer · 2017-11-09 07:55:17Z

1

First you need to json encode your return value from php like this

<?php
$json_data_array = '[]';
return json_encode($json_data_array);
?>

Then you have to check the length of returned array at javascript side like this

if(data.length > 0){
  console.log('data is there');
}else{
  console.log('data is not there'); 
}

answered Nov 9, 2017 at 7:55

Bhatia Gaurav

113 bronze badges

Comments

Ashish Tiwari · Accepted Answer · 2017-11-09 09:19:32Z

1

You can check by using below method:

if( Object.prototype.toString.call( your_variable ) === '[object Array]' ) {
    alert( 'Array' );
}else{
    alert('Not Array');
}

answered Nov 9, 2017 at 9:19

Ashish Tiwari

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Comments

Reuben Gomes · Accepted Answer · 2017-11-09 07:41:03Z

0

use and echo json_encode($json_data_array);

build a normal array and then convert it to json it will be easier

<?php
$json_data_array = array();
echo json_encode($json_data_array);
?>

in your jquery use

if($.isEmptyObject(data))

edited Nov 9, 2017 at 7:41

answered Nov 9, 2017 at 7:35

Reuben Gomes

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Comments

alexander · Accepted Answer · 2017-11-09 07:35:41Z

-1

In javascript empty array ([]) return true. You should check array.length

answered Nov 9, 2017 at 7:35

alexander

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