How to display table records in an HTML variable in a catalog item from the onload catalog script

[peterscaramuzzo]

I want to display the contents of a table filtering on a specific field in an HTML variable on a catalog item. I put the code I found in an onload script but can't seem to get it to work. Is there an out of the box server script include I can use? I assume TableDataLoader is an example of a custom server side script that needs to be created?

function onLoad() {

    var ga = new GlideAjax('TableDataLoader');

    ga.addParam('sysparm_name', 'getMatchingRecords');

    ga.addParam('sysparm_table_name', 'myTable');

    ga.addParam('sysparm_encoded_query', 'tableColumn=xxxx');

    ga.getXML(processResponse);

    g_form.setValue('myHTMLvariable', response);

}

function processResponse(response) {

    alert('function start');

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

    var records = JSON.parse(answer);

    var tableHeaders = ['Column1, 'Column2']; // Headers for your table

    var tableHTML = '<table border="2" style="width: 100%; border-collapse: collapse;"><thead><tr>';

    // Add headers

    for (var i = 0; i < tableHeaders.length; i++) {

        tableHTML += '<th style="padding: 5px;">' + tableHeaders[i] + '</th>';

    }

    tableHTML += '</tr></thead><tbody>';

    // Add rows

    if (records.length > 0) {

        for (var j = 0; j < records.length; j++) {

         tableHTML += '<tr>';

         tableHTML += '<td style="padding: 5px;">' + records[j].u_column1 + '</td>';

         tableHTML += '<td style="padding: 5px;">' + records[j].u_column2 + '</td>';

         tableHTML += '</tr>';

        }

        document.getElementById('no_records').style.display = 'none';

    } else {

        document.getElementById('no_records').style.display = '';

    }

    tableHTML += '</tbody></table>';

    document.getElementById('dvTable').innerHTML = tableHTML;

}