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JavaScript Populating HTML Combobox with Javascript and JSON Files


New Coder
<!DOCTYPE html>
<html lang="en">
<meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" /> <meta http-equiv="Pragma" content="no-cache" /> <meta http-equiv="Expires" content="0" />
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>JSON Test</title>
    <div id="myData">
<p>Reference Documents</p>
    <select name="ComboRefDocs" id="ComboRef">
    <option selected value="">Select Desired Document</option>

<p>Minutes Documents</p>
    <select name="ComboMinsDocs" id="ComboMins">
    <option selected value="">Select Desired Document</option>

<p>Forms Documents</p>
    <select name="ComboFormsDocs" id="ComboForms">
    <option selected value="">Select Desired Document</option>

<p>Financial Documents</p>
    <select name="ComboFinDocs" id="ComboFin">
    <option selected value="">Select Desired Document</option>

let url = "FormsDocs.json";
let comboName = "ComboForms";

url = "ReferenceDocs.json";
comboName = "ComboRef";

url = "FinancialDocs.json";
comboName = "ComboFin";

url = "MinutesDocs.json";
comboName = "ComboMins";

function loademup()
            .then(function (response) {
                return response.json();
        alert('Finished reading input file: ' + url);
            .then(function (data) {
        alert('Finished adding items to combobox for file: ' + url);
            .catch(function (err) {
                console.log('error: ' + err);
        function appendData(data) {

let ele = document.getElementById(comboName);
            for (var i = 0; i < data.length; i++) {
            ele.innerHTML = ele.innerHTML +
                '<option value="' + data[i]['filename'] + '">' + data[i]['itemvalue'] + '</optioin>';


I am attempting to populate four HTML comboboxes using Javascript to read JSON files containing the combobox values. The four files are being read and the values are being populated but they are being populated into one box instead of the four desired. What is strange is that the box being populated is the last one used in the call function within the script. I set a variable with the URL of the JSON file (which it working as all four files are read) and another variable with the name of the combobox to update. This is where the problem is as the last box called has all of the entries from the four files. I am sure it is something simple but I haven't put my finger on it.
An update since I posted. I added a line after "Function loademup() of "Let a = comboName;" and then changed the get.elementById(comboName) to get.elementById(a) and it worked. All combo box items were loaded to the proper combobox. Now the question is why that worked or why the initial way didn't?

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