How to check is an attachment has been added to a request

[Nikkikobako]

Hi I have used a number of suggestions I found online to check if an attachment is attached but most just error. The closest i get is below I check first if a selection is yes then if it is I run the code below: 

This gives me alert 2 msg then alert 3 msg with a value of 0 if attached or not, 

Any help would be very much appreciated, thank you 🙂 

function onSubmit() {
var myFieldValue = g_form.getValue('polygon_details_attached');

//Check if meant to have an attachment
if (myFieldValue == "Yes") {
  var cat_id = 'sysparm_item_guid'.value;
  var gr = new GlideRecord("sys_attachment");
  alert ("its yes 2");
  gr.addQuery("table_name", "sc_cart_item");
  gr.addQuery("table_sys_id", cat_id);
  gr.query();
  alert("its yes3 = " + gr.getRowCount());

  if (!gr.next()) {
     alert("You must attach a file to submit.");
    return false;
  }
}
}

[Mandeep Karan]

is this in Service Portal or native UI?

[Nikkikobako]

Service Portal I have used a catalog client script

[Harsh Vardhan]

try now. 

function onSubmit() {
var myFieldValue = g_form.getValue('polygon_details_attached');

//Check if meant to have an attachment
if (myFieldValue == "Yes") {
  var cat_id = g_form.getUniqueValue();
  var gr = new GlideRecord("sys_attachment");

  gr.addQuery("table_name", "sc_cart_item");
  gr.addQuery("table_sys_id", cat_id);
  gr.query();
  alert("its yes3 = " + gr.getRowCount());

  if (!gr.next()) {
     alert("You must attach a file to submit.");
    return false;
  }
}
}

[Nikkikobako]

no 😞 count is still showing as 0 when i attach a file