Json Question posted in
Our archive of expertly curated questions and answers provides insights and solutions to common problems related to this popular data interchange format. From parsing and manipulating JSON data to integrating it with various programming languages and web services, our archive has got you covered. Start exploring today and take your JSON skills to the next level

Classic ASP and json2.js: how to access keys with special characters?

In this answer: https://stackoverflow.com/a/1021848/5280471 it is suggested to use a "language-wrapping" technique to implement JSON parsing by importing a json2.js JavaScript file like so:

<script language="JScript" runat="server" src='path/to/json2.js'></script>

<%

Dim myJSON
myJSON = Request.Form("myJSON") // "[ 1, 2, 3 ]"
Set myJSON = JSON.parse(myJSON) // [1,2,3]
Response.Write(myJSON)          // 1,2,3
Response.Write(myJSON.[0])      // 1
Response.Write(myJSON.[1])      // 2
Response.Write(myJSON.[2])      // 3
%>

Where json2.js can be found at https://github.com/douglascrockford/JSON-js/blob/master/json2.js .

The problem rose when I was trying to interpret a google recaptcha return JSON, which is:

{"success":false,"error-codes":["invalid-input-response"]}

So, I can access myJSON.success no problem. Yet I don’t know how I could access, from ASP, the error-codes array. Is there any way that could be achieved from ASP, or am I stuck there?

I already tried some random tricks, like calling MyJSON.get("error-codes"), some obvious syntax errors like MyJSON("error-codes"), MyJSON."error-codes" and also hoped for the best, MyJSON.error_codes as well as MyJSON.["error-codes"]. All of them returning their respective exception, code-breaking errors.

Tags:

2

Answers


  1. Chosen as BEST ANSWER
    0

    For now, a less-than-optimal is to write a helper function, in JS itself, to get the key. For instance, I added this section to my local copy of json2.js file:

        if (typeof JSON.getKey !== "function") {
        JSON.getKey = function (obj, key) {
            return obj[key];
        };
    }

    So that I can do:

    ' here, I mangled the array to have several elements
jsonstr = "{""success"":false,""error-codes"":[""invalid-input-response"", ""element2"", ""element3""]}"

jsonobj = JSON.parse(jsonstr)
response.write("Success is: " & jsonobj.success) ' prints 'false'

errors_array = JSON.getKey(jsonobj, "error-codes")
response.write("Error codes array has: " & errors_array) ' prints 'invalid-input-response,element2,element3

    So in the end I needed a JavaScript wrapper to get access to these keys. I'd gladly mark up as answer if somebody suggests a means to elegantly access these keys without wrapping thru javascript.


  2. 0

    I am no longer in an environment where I can test this myself, but if memory servers, classic asp allowed special chars as property names, when they were enclosed in brackets.

    Have you tried the following syntax?

    MyJSON.[error-codes]

    You said that you have tried MyJSON.["error-codes"], but since everything inside the brackets is taken literally, the interpreter would look for a property named "error-codes", but there isn’t – it’s error-codes

    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search