FTT-JavaScript/aulajs18.html at master · luizgustavo77/FTT-JavaScript · GitHub

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<!DOCTYPE html>
<html>
    <head>
    <title>JavaScript Aula 18</title>
    <script>
        var apiMessage;

        function callApi() {

            var query = document.getElementById("busca").value;

            var xhttp = new XMLHttpRequest();
            xhttp.onreadystatechange = function() {
                if (this.readyState == 4 && this.status == 200) {
                    apiMessage = JSON.parse(this.responseText); //importa o arquivo texto inteiro em um único string
                    document.getElementById("jsonData").innerText = this.responseText;
                    mostraResposta(apiMessage);

                }
            };
            xhttp.open("GET", "https://api.duckduckgo.com/?format=json&pretty=1&q=" + query, true);
            xhttp.send();


        }

        function mostraResposta(resp) {

            var firstText = resp.RelatedTopics[0].Text;
            var pTag = document.createElement("p");

            pTag.innerText = firstText;

            document.getElementById("resposta").appendChild(pTag);

        }

    </script>
    <style>
        pre { background-color: lemonchiffon;
        }
    </style>

</head>

<body>
    <h1>JavaScript Aula 18</h1>
    <h2>JSON, API, AJAX - Asynchronous JavaScript And XML</h2>
    <input type="search" id="busca" placeholder="O que você quer saber?" required></input>
    <button onclick="callApi();">Get data</button>
    <div id="resposta"></div>
    <pre id="jsonData"></pre>
    </body>
</html>