Question

144

Find value in Json by javascript

rated 0 times [ 151] [ 7] / answers: 1 / hits: 31393 / 15 Years ago, mon, november 9, 2009, 12:00:00

I cant find one way to get this value (comment) into json using javascript.

var myJSONObject = {

    topicos: [{

        comment: {

            commentable_type: Topico, 

            updated_at: 2009-06-21T18:30:31Z, 

            body: Claro, Fernando! Eu acho isso um extremo desrespeito. Com os celulares de hoje que atu00e9 filmam, poderu00edamos achar um jeito de ter postos de denu00fancia que receberiam esses vu00eddeos e recolheriam os motoristas paressadinhos para um treinamento. O que vocu00ea acha?, 

            lft: 1, 

            id: 187, 

            commentable_id: 94, 

            user_id: 9, 

            tipo: ideia, 

            rgt: 2, 

            parent_id: null, 

            created_at: 2009-06-21T18:30:31Z

        }

    }]

};

I'm trying a example like this:

alert(myJSONObject.topicos[0].data[0]);

Some body can help me?

The json is from Ruby On rails application, using render :json => @atividades.to_json

Tks a lot!
Marqueti

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jeniferjaliyahf

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4 Years ago

answered 15 Years ago bobbidayanam · Accepted Answer

~~Your JSON is formatted in such a way that it is very hard to read, but~~ it looks to me like you're looking for:

alert( myJSONObject.topicos[0].comment );

This is because there is no data key in the object given by ...topicos[0], but rather just the key comment. If you want further keys past that just continue like: obj.topicos[0].comment.commentable_type.

Update

To find out what keys are in topicos[0] you can take a couple approaches:

use a switch or if like:

var topic = myJSONObject.topicos[0];

if( topic.hasOwnProperty( 'comment' ) ) {

  // do something with topic.comment

}

You might have issues with cross browser compatibility here, so using a library like jQuery would be helpful, but in general you can map over the properties like so:
```
for( var key in myJSONObject.topicos[0] ) {

  // do something with each `key` here

}
```