Profound Logic Forums

Posted: **Mon May 07, 2018 2:06 pm**

I know I'm missing something simple, but can't seem to locate it.

I have a universal display file that basically just returns the item description from the item number and location passed.

The UDF works fine in SOAPUI.

I'm basically getting the error that result is null. The actual error is "Cannot read property 'success' of null'.
Here is the javascript that I'm using to invoke the UDF.

Code: Select all

debugger;
ajaxJSON({
url: "/profoundui/universal/facValidItem",
params: {
itemNumber: getObj("txtItemNumber").value,
location: "01"
},
method: "get",
async: true,
handler: function(result) {
  if (result.success) {
    changeElementValue("txtDescription",result.itemDesc);
  }
  else {
    applyProperty("txtItemNumber","focus",true);
    getObj("txtItemNumber").select();
    alert(result.errorDesc);
  }  
}
});

Posted: **Mon May 07, 2018 9:09 pm**

Mark,

Its not clear why result is coming back null for you. I would suggest using the browser's debugging tools to see what's going on.

I'd start with the "Network" tool to see that the HTTP request is running properly, and that it's returning the proper document.

Posted: **Tue May 08, 2018 8:48 am**

Status is 200.

Posted: **Tue May 08, 2018 9:32 am**

Ok, I think the problem may be the actual ajax call. I tried to put my RPG for the UDF into debug and it was never invoked. I can see the javascript fire in the Chrome debugger. I'm sure my PUIMAPP file is populated properly. I can even put the url/queryString into a browser and get the proper results. Not sure where to go from here.

Posted: **Tue May 08, 2018 11:14 am**

I was wrong. The program is getting invoked because I sent it some bad data, and it abended. So, I'm back to square one. Why is my response null?

I can see the response in the response section of the Chrome network tool in the Developer Tools.

Posted: **Wed May 09, 2018 1:20 pm**

ajaxJSON will pass null to your handler if the data isn't valid JSON data.

Here's an excerpt from the code inside the ajaxJSON routine:

Code: Select all

    var responseText = ajaxRequest.getResponseText();
    try {
      responseObj = eval("(" + responseText + ")");
    }
    catch(e) {
      callback(null, e);
      return;
    }
    if (async == true) {
      callback(responseObj);
    }

As you can see, it evaluates the JSON data into a JavaScript object in a try/catch group. The only time it calls your handler routine ("callback") and passes null is if the evaluation resulted in an error.

Posted: **Wed May 09, 2018 1:45 pm**

Thanks so much, AGAIN, Scott. I wasn't delimiting my character fields.

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