通过javascript在Json中找到价值 [英] Find value in Json by javascript

问题描述

我找不到一种方法可以使用javascript将此值（注释）转换为json。

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 at\u00e9 filmam, poder\u00edamos achar um jeito de ter postos de den\u00fancia que receberiam esses v\u00eddeos e recolheriam os motoristas paressadinhos para um treinamento. O que voc\u00ea 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"
        }
    }]
};

我正在尝试这样的例子：

I'm trying a example like this:

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

有些机构可以帮助我吗？

Some body can help me?

json来自Ruby On rails应用程序，使用 render：json => @ atividades.to_json

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

很多！
Marqueti

Tks a lot! Marqueti

推荐答案

您的JSON格式化方式非常难以阅读，但是它看起来像你在寻找：

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 );

这是因为没有数据键在 ... topicos [0] 给出的对象中，而只是键注释。如果你想要更多的密钥，只需继续： obj.topicos [0] .comment.commentable_type 。

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.

更新

查找 c>主题中的键[0] 你可以采取几种方法：

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

1. 使用开关或如果：

1. use a switch or if like:

var topic = myJSONObject.topicos[0];
if( topic.hasOwnProperty( 'comment' ) ) {
  // do something with topic.comment
}

此处可能存在跨浏览器兼容性问题，因此请使用 jQuery等库会有所帮助，但一般情况下你可以像这样映射属性：

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
}

这篇关于通过javascript在Json中找到价值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！