evalJSON not supported in Service Portal

[Katie A]

Hello, We have several Client Scripts that call a Script Include to process data and send a response.

We use the evalJSON function to transform a JSON string to an object.

However, evalJSON is no longer supported in the Service Portal.

Is there a way to transform a JSON string to an object so that it can be dot-walked easily to retrieve the values?

We are using the technique here: https://fruitionpartners.eu/blog/2015/11/17/glideajax-return-multiple-values-using-json/

Script Include

var MyCustomAjax = Class.create();
MyCustomAjax.prototype = Object.extendsObject(AbstractAjaxProcessor, {
   helloWorld: function() {
   var obj = {};
   obj.var1 = 'Hello';
   obj.var2 = 'World';
   var json = new JSON();
   var data = json.encode(obj);//JSON formatted string
   return data;
   },
   type: 'MyCustomAjax'
});

Client Script

function onLoad() {
   var ga = new GlideAjax('MyCustomAjax');
   ga.addParam('sysparm_name', 'helloWorld');
   ga.getXML(showMessage);
}
function showMessage(response) {
   var answer = response.responseXML.documentElement.getAttribute("answer");
   g_form.addInfoMessage(answer); //JSON String
   answer = answer.evalJSON(); //Transform the JSON string to an object NO LONGER SUPPORTED!
   g_form.addInfoMessage(answer);
   g_form.addInfoMessage(answer.var1); //Display "Hello"
   g_form.addInfoMessage(answer.var2); //Display "World"
}

[Katie A · Accepted solution]

I have resolved this issue by using the native Javascript JSON.parse() method.

JSON.parse() - JavaScript | MDN

answer = JSON.parse(answer);

[Satish Babu]

Hello,

JSON.parse doesn't seem to be working on the Catalog Client Script any help on this.

Thanks

[Katie A]

This works for me... make sure that the UI Type is set to "Both"

[akasharora]

Thank you!

I did something like this so it will work for both the places.

var answer = response.responseXML.documentElement.getAttribute("answer"); //JSON string

try{

  answer = answer.evalJSON();

  }

catch(e){

  answer = JSON.parse(answer);

}