Cropper js with modal image preview

770 06 October 2019

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Abhishek Singh

~ onex

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Cropperjs is a feature-rich pure javascript library for cropping image. using this you can able to able to provide image cropping to the client-side.

client-side image cropping by

onex


    window.addEventListener('DOMContentLoaded', function () {
      var avatar = document.getElementById('avatar');
      var image = document.getElementById('image');
      var input = document.getElementById('uploadImage');
      var $progress = $('.progress');
      var $progressBar = $('.progress-bar');
      var $alert = $('.alert');
      var $modal = $('#modal');
      var cropper;

      $('[data-toggle="tooltip"]').tooltip();

      input.addEventListener('change', function (e) {
        var files = e.target.files;
        var done = function (url) {
          input.value = '';
          image.src = url;
          $alert.hide();
          $modal.modal('show');
        };
        var reader;
        var file;
        var url;

        if (files && files.length > 0) {
          file = files[0];

          if (URL) {
            done(URL.createObjectURL(file));
          } else if (FileReader) {
            reader = new FileReader();
            reader.onload = function (e) {
              done(reader.result);
            };
            reader.readAsDataURL(file);
          }
        }
      });

      $modal.on('shown.bs.modal', function () {
        cropper = new Cropper(image, {
          aspectRatio: 1,
          viewMode: 3,
        });
      }).on('hidden.bs.modal', function () {
        cropper.destroy();
        cropper = null;
      });

      document.getElementById('crop').addEventListener('click', function () {
        var initialAvatarURL;
        var canvas;

        $modal.modal('hide');

        if (cropper) {
          canvas = cropper.getCroppedCanvas({
            width: 160,
            height: 160,
          });
          initialAvatarURL = avatar.src;
          avatar.src = canvas.toDataURL();
          $progress.show();
          $alert.removeClass('alert-success alert-warning');
          canvas.toBlob(function (blob) {
            var formData = new FormData();

            formData.append('avatar', blob, 'avatar.jpg');
            // console.log(canvas.toDataURL());
            $('.adp').html('<img src="'+canvas.toDataURL()+'">');
            $.ajax('https://www.adminspress.com', {
              method: 'POST',
              data: formData,
              processData: false,
              contentType: false,

              xhr: function () {
                var xhr = new XMLHttpRequest();

                xhr.upload.onprogress = function (e) {
                  var percent = '0';
                  var percentage = '0%';

                  if (e.lengthComputable) {
                    percent = Math.round((e.loaded / e.total) * 100);
                    percentage = percent + '%';
                    $progressBar.width(percentage).attr('aria-valuenow', percent).text(percentage);
                  }
                };

                return xhr;
              },

              success: function () {
                $alert.show().addClass('alert-success').text('Upload success');
              },

              error: function () {
                avatar.src = initialAvatarURL;
                $alert.show().addClass('alert-warning').text('Upload error');
              },

              complete: function () {
                $progress.hide();
              },
            });
          });
        }
      });
    });

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Cropper js with modal image preview

Abhishek Singh

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