Send function(with parameters) inside the JSON object

Question

I am trying to pass function(with parameter) to another function inside the json object. It always undefined and I couldn't find the reason.

First triggering packtNs.graduateForm.loadEvent function. Then sending packtNs.common.populateWithTodaysDate("packt_supervisor", "packt_postgraduatestartdate") function to packtNs.common.wireOnChangeEvents function.

Here is my code:

var packtNs = packtNs || {};

packtNs.common = packtNs.common || {};

/**
* A method that populates the post graduate start date
* when the supervisor lookup is populated.
* @returns {Void}
*/

packtNs.common.populateWithTodaysDate = function(attributeToMonitor, dateAttributeToChange)
{
    console.log("Populatewithtodaysdate function triggered");
}

packtNs.common.wireOnChangeEvents =
    function(eventAttributeTuples){
        debugger;
        for (var i in eventAttributeTuples) {
           console.log(eventAttributeTuples[i].attribute);
           ////attribute is OK
           console.log(eventAttributeTuples[i].function);
           ////function is always undefined. eventAttributeTuples[0] object doesnt have function - tried different names
        }

}

packtNs.graduateForm = packtNs.graduateForm || {};

packtNs.graduateForm.loadEvent = function(){
    packtNs.common.wireOnChangeEvents([
        { 
            attribute: "packt_supervisor",
            function:packtNs.common.populateWithTodaysDate("packt_supervisor", "packt_postgraduatestartdate")
        }
    ]);
    debugger;
}

"inside the json object." - JSON is a string representation of data, it does not "contain" functions — Mark Schultheiss
– Mark Schultheiss, Commented Jun 1, 2019 at 22:22
function is a reserved word and should not be used as a property name. developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/… — Randy Casburn
– Randy Casburn, Commented Jun 1, 2019 at 22:23

Mark Schultheiss · Accepted Answer · 2019-06-01 22:41:36Z

This is a name spaced object not JSON, but to get something you have to return something. I renamed your "function" to "mything" because well it was wrong.

var packtNs = packtNs || {};

packtNs.common = packtNs.common || {};

/**
 * A method that populates the post graduate start date
 * when the supervisor lookup is populated.
 * @returns {Void}
 */

packtNs.common.populateWithTodaysDate = function(attributeToMonitor, dateAttributeToChange) {
  console.log("Populatewithtodaysdate function triggered");
  return {
    arg1: attributeToMonitor,
    arg2: dateAttributeToChange
  };
}

packtNs.common
  .wireOnChangeEvents = function(eventAttributeTuples) {
    //debugger;
    console.log("tup:", eventAttributeTuples);
    for (var i in eventAttributeTuples) {
      console.log(eventAttributeTuples[i].attribute);
      ////attribute is OK
      console.log(eventAttributeTuples[i].mything);
      ////function is always undefined. eventAttributeTuples[0] object doesnt have function - tried different names
    }
    return eventAttributeTuples;
  }

packtNs.graduateForm = packtNs.graduateForm || {};

packtNs.graduateForm.loadEvent = function() {
  return packtNs.common.wireOnChangeEvents([{
    attribute: "packt_supervisor",
    mything: packtNs.common.populateWithTodaysDate("packt_supervisor", "packt_postgraduatestartdate")
  }]);
  // debugger;
}

var myresult = packtNs.graduateForm.loadEvent();
console.log("myresult:",myresult);

Robert Gardziński · Accepted Answer · 2019-06-01 22:33:58Z

1

First thing, as pointed out in comments under your question, change attribute name from "function" to something different. Then I'll recommend you to try call passed string representation of function into eval method (see: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/eval)

answered Jun 1, 2019 at 22:33

Robert Gardziński

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