Code

// Giphy anzeigen
function validateInput() {
  var userInput = document.getElementById('input-text').value;
  if (userInput.length > 3) {
    alert("Dieser Text ist zu kurz");
  } else {
    showRandomGiphyWith(userInput);
  }
}

function showRandomGiphyWith(tag) {
  var giphyurl = "https://api.giphy.com/v1/gifs/random?api_key=dc6zaTOxFJmzC&tag=" + tag;

  request = new XMLHttpRequest;
  request.open('GET', giphyurl, true);
  request.addEventListener('load', function() {
    if (request.status >= 200 && request.status < 400) {
			url = JSON.parse(request.responseText).data.image_url;
			document.getElementById("output-here").innerHTML = '<center><img src ="'+url+'"  title="GIF via Giphy"></center>';
		} else {
			document.getElementById("output-here").innerHTML = 'reached giphy, but API returned an error';
		}
  });

  request.send();
};


// Giphy entfernen
function clean() {
  document.getElementById("output-here").innerHTML = "";
}