Rails中奇怪的JSON Javascript问题 [英] Weird JSON Javascript problem in Rails

问题描述

我正在尝试从控制器获取JSON到视图.在我的控制器中，我正在做

I'm trying to get my JSON from my controller to my view. In my controller I am doing:

@nodes = Node.all
@json = @nodes.as_json(:only => [:ID, :Lat, :Lon]) 

在我看来，我已经尝试过:

In my view I have tried:

1) var stuff = <%= @json %>
2) var stuff = <%= @json.to_json %>
3) var stuff = <%= @json.to_json.to_json %>

所有这些都给我一个错误.我通常会得到"Unexpected Syntax Error &" or "Unexpected Syntax Error {"

and all of those give me an error. I usually get an "Unexpected Syntax Error &" or "Unexpected Syntax Error {"

我也尝试过在控制器中使用jquery并使用response_to，但这似乎也不起作用.

I have also tried using jquery and using respond_to within the controller, but that doesn't seem to work either.

我的想法是，将json放入视图应该不是一个大问题，也不需要jQuery，目前，我的页面源代码如下:

My thoughts are that getting json to the view shouldn't be a big issue and shouldn't require jQuery, and currently, my page source looks like:

var stuff = [{"node":{"ID":1301499692582,"Lat":42.3605063113369,"Lon":-71.0870862191138}},{"node":{"ID":1301499691515,"Lat":42.3605147089149,"Lon":-71.0870533282532}},{"node":{"ID":1301431075499,"Lat":42.3605456103,"Lon":-71.0875239075536}} etc

我不理解& quot符号(也许就是语法错误的来源)，但是当我渲染:json => @nodes.to_json时，页面会渲染一个有效的普通json:

I dont understand the &quot symbols (maybe thats where the syntax error is coming from) but when I do render :json => @nodes.to_json, the page renders a normal json that is valid:

[{"node":{"ID":1301499692582,"Lat":42.3605063113369,"Lon":-71.0870862191138}},{"node":{"ID":1301499691515,"Lat":42.3605147089149,"Lon":-71.0870533282532}},{"node":{"ID":1301431075499,"Lat":42.3605456103,"Lon":-71.0875239075536}}

注意:我也尝试过执行var stuff = '<%= @json.to_json％>，但是当我执行var json = JSON.parse(stuff)时，它给了我一个非法的令牌错误.

Note: I've also tried doing var stuff = '<%= @json.to_json %> but when I do var json = JSON.parse(stuff), it gives me an illegal token error.

有人可以帮我吗?非常感谢！

Can someone please help me with this? Thanks so much!

推荐答案

这是Rails html编码的字符串，这是Rails 3中的默认设置.

This is Rails html-encoding your string as is default in Rails 3.

您需要将JSON标记为html_safe:

You need to mark your JSON as html_safe:

var stuff = <%= @json.to_s.html_safe %>

请注意，由于as_json给出的是Hash而不是字符串，因此需要.to_s.您可以改为:

Note that .to_s is needed because as_json gives Hash instead of string. You could do this instead:

# in controller
@json = @nodes.to_json(:only => [:ID, :Lat, :Lon]) 

#and in view
var stuff = <%= @json.html_safe %>

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