Drag & Drop of Images with HTML5

This is just a basic code snippet which shows how you can handle Drag & Drop interactions with a web browser and HTML5. If you select multiple images and drag them into the drop target, then the file names of the dropped images will be logged.

<!DOCTYPE html>
<html>
  <head>
    <title>HTML5 - Drag & Drop Images</title>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <style>
      #dropTarget {
        color: #555;
        border: 1px solid rgb(204, 204, 204);
        font-family: Sans-Serif;
 
        width: 200px; 
        height: 200px;
 
        padding: 10px;
      }
    </style>
  </head>
  <body>
    <div id="dropTarget">Drop here</div>
    <script>
      var dropTargetName = 'dropTarget';
      var dropTarget = document.getElementById(dropTargetName);
      dropTarget.addEventListener('dragenter', doNothing, false);
      dropTarget.addEventListener('dragover', doNothing, false);
      dropTarget.addEventListener('drop', dropIt, false);
 
      function doNothing(event) {
        event.preventDefault();
        return false;
      }
 
      function dropIt(event) {
        handleImages(event.dataTransfer.files);
        event.stopPropagation();
        event.preventDefault();
      }
 
      function handleImages(images) {
        for (var i = 0, len = images.length; i < len; i++) {
 
          var imageFile = images[i];
 
          var fileReader = new FileReader();
          fileReader.onload = (function(image) {
            console.log('File name: ' + image.name);
          })(imageFile);
 
        }
      }
    </script>
  </body>
</html>

Here is an example of how the „handleImages“ function can be adjusted in a way that dropped images will be added to the HTML page:

function handleImages(images) {
  for (var i = 0, len = images.length; i < len; i++) {
 
    var imageFile = images[i];
 
    var fileReader = new FileReader();
    fileReader.onload = (function(image) {
 
      return function(event) {
        var img = new Image();
        img.src = event.target.result;
        img.title = image.name;
        document.body.appendChild(img);
      };
 
    })(imageFile);
 
    fileReader.readAsDataURL(imageFile);
 
  }
}

Recommended articles:
Implementing Native Drag and Drop

Schreibe einen Kommentar Antworten abbrechen