jsLessons/autocomplete.html at master · FreeCodeCampHelsinki/jsLessons · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <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>Document</title>

</head>
<body>
    <input id="country" placeholder="" />
    <div id="selections"></div>

    <script>
        function populateInput(name)
        {
            document.getElementById('country').value = name;
            document.getElementById('selections').innerHTML = "";
        }

        window.onload = function()
        {
            var countriesXML = null;
            var countries = null;

            if(window.XMLHttpRequest)
            {
                countriesXML = new XMLHttpRequest();
            }
            else
            {
                countriesXML = new ActiveXObject("Microsoft.XMLHTTP");
            }

            countriesXML.onreadystatechange = function()
            {
                if(countriesXML.readyState === 4)
                {
                    //Do work here
                    countries = JSON.parse(countriesXML.responseText);
                }
            }

            countriesXML.open("POST","countries.js");
            countriesXML.send(null);

            var inputCountry = document.getElementById('country');
            var divSelections = document.getElementById('selections');

            inputCountry.onkeyup = function()
            {
                divSelections.innerHTML = '';
                if(inputCountry.value !== '')
                {
                    divSelections.innerHTML = "<ul>";
                    var strRegex = new RegExp(inputCountry.value,'i');
                    countries.forEach(function(country){
                        if(strRegex.test(country.name))
                            divSelections.innerHTML += "<li onclick=\"populateInput(\'"+country.name+"\')\">" + country.name + "</li>";
                    })
                    divSelections.innerHTML += "</ul>";
                }
            }
        }
    </script>
</body>
</html>