Unhandled Exception in GlideAjax

[appstorm]

Need some help debugging my Client Script/ Script Include.  The Client Script is supposed to call a Script Include to display JSON output from a REST message, in a form select box (drop-down) but it is throwing an Unhandled Exception in GlideAjax in the browser console.

CS:

function onLoad() {
    // Get the control for the 'course_information' field using its field name
    var courseSelect = g_form.getControl('course_information');  // Internal field name

    // Ensure the field exists
    if (courseSelect) {
        // Create GlideAjax instance to call the Script Include
        var ga = new GlideAjax('CourseInformation');  // Name of the Script Include
        ga.addParam('method', 'getCourses');  // The method inside your Script Include that returns courses

        // Fetch course data via GlideAjax and handle it asynchronously
        ga.getXMLAnswer(function(response) {
            var courseData = JSON.parse(response);  // Parse the response to handle course data
            
            // Clear any existing options in the dropdown
            courseSelect.innerHTML = '';

            // Add a default option to the dropdown
            var defaultOption = document.createElement('option');
            defaultOption.value = '';
            defaultOption.text = '-- Select a Course --';
            courseSelect.appendChild(defaultOption);

            // Populate dropdown with course data
            for (var i = 0; i < courseData.length; i++) {
                var course = courseData[i];
                var option = document.createElement('option');
                option.value = course.crn;  // Set CRN as the value
                option.text = course.subject_code + " " + course.course_number;  // Display subject_code + course_number
                courseSelect.appendChild(option);
            }
        });
    } else {
        console.error('Field "course_information" is not found or rendered on the form.');
    }
}

SI:

var CourseInformation = Class.create();
CourseInformation.prototype = {
    initialize: function() {},

    // Method to fetch course data from the LARF Banner Courses REST message
    getCourses: function() {
        var courseData = [];
        
        // Create an instance of the RESTMessageV2 object
        var restMessage = new sn_ws.RESTMessageV2();
        restMessage.setRestMessageName('LARF Banner Courses');  // Your REST message name
        var response = restMessage.execute();
        var responseBody = response.getBody();
        var responseData = JSON.parse(responseBody);  // Assuming JSON response format
        
        // Process and format the response data
        for (var i = 0; i < responseData.length; i++) {
            var course = responseData[i];
            courseData.push({
                crn: course.crn,
                term_code: course.term_code,
                part_of_term: course.part_of_term,
                subject_code: course.subject_code,
                course_number: course.course_number,
                sequence: course.sequence,
                faculty_cnumber: course.faculty_cnumber
            });
        }

        // Return the formatted course data
        return JSON.stringify(courseData);
    },
    
    type: 'CourseInformation'
};

[priyatam_pvp]

Can you check if the script include is client callable?

if yes, the SI first two lines should be like below

var Test = Class.create();

Test.prototype = Object.extendsObject(AbstractAjaxProcessor, {

Please mark it helpful
Regards
Priyatam

[Community Alums]

Hi @appstorm 

Kindly update below line of code in your client script and check.

ga.addParam('sysparm_name, 'getCourses'); // The method inside your Script Include that returns courses

Note: The first call to addParam should be with the parameter sysparm_name and the name of the server-side method you want to call.

https://www.servicenow.com/docs/bundle/yokohama-api-reference/page/app-store/dev_portal/API_referenc...

Mark this helpful/ Accept the solution if it helps you

[appstorm]

Thank you for your reply!  I have made the change.  However, the result remains the same.

[appstorm]

Also getting this response in the console: "1 Uncaught (in promise) Error: A listener indicated an asynchronous response by returning true, but the message channel closed before a response was received"