Get the value from Json Array in java script?

Question

I Create the JSON Array like in the name of jarray.

It has id and the corresponding value.

And I have an another variable arr.

Now, how do I get the value of the value from json array using id.

It means if i need to check the jarray by using the var id=04.

If i found 04 i need the value of the particular id like Apple as a out put.

How to use the If condition in Json array?

var jarray=[{"id":"04","value":"Apple"},{"id":"13","value":"orange"}];
var id=04;

possible duplicate of [JSON find in JavaScript](http://stackoverflow.com/questions/1946165/json-find-in-javascript) — T.J. Crowder, Jul 12 '12 at 13:14

Denys Séguret · Answer 1 · 2012-07-12T13:24:09.527

1

This returns an array of all the items whose id is "04" :

var matches = jarray.filter(function(a){return a.id==id;});

If you're sure there is only one, you can take matches[0];.

Note that this works with id provided as "04" or 04.

To ensure compatibility with old browsers (which might not have the filter function) see this.

edited Jul 12 '12 at 13:24

answered Jul 12 '12 at 13:14

Denys Séguret

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in practice, he'd want to check `a.id === id`. @user, note though that your `id` variable is not a string, but a number, you'd need to change it to `var id = '04'` – jackwanders Jul 12 '12 at 13:18
yes, but it's not a best practice to rely on the "flexibility" of the `==` operator. it's better to use '===' and to ensure your values are of the same type – jackwanders Jul 12 '12 at 13:40

score 0 · Answer 2 · edited Jul 12 '12 at 13:20

0

var i=0;
while(i<jarray.length) {
  if(jarray[i].id==id) {
    var val=jarray[i].value;
    break;
  }
}

edited Jul 12 '12 at 13:20

Cecchi

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answered Jul 12 '12 at 13:15

Cecchi · Answer 3 · 2012-07-12T13:21:58.980

0

You can either use something like Underscore's _.find` method, or write your own which might be more specific to your case:

function findId(id, arr, member) {
  for(i in arr) {
    // You could use === here depending on your needs
    if(arr[i]['id'] == id) {
      return member === undefined ? arr[i] : arr[i][member];
    }
  }
  return false;
}
findId('04', jarray, 'value'); // Apple

edited Jul 12 '12 at 13:21

answered Jul 12 '12 at 13:15

Cecchi

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score 0 · Accepted Answer · answered Jul 12 '12 at 13:21

0

like this:

for (i=0;i<jarray.length;i++)
    {
        var tempValue = jarray[i];
        if (tempValue["id"] == id)
            alert( "value is : " + tempValue["value"] );
    }

answered Jul 12 '12 at 13:21

Al-Mothafar

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Get the value from Json Array in java script?

4 Answers4