CropperJS and HTML5 Canvas











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1
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I have a testbed for CropperJS - I have included a working sample. It displays your camera, and when you click take a snapshot, it copied the current image to the canvas. However, I cannot get the following to work:




  1. When the image is cropped, I need to put the cropped image in the canvas instead of the image control.


  2. I need to move the upload an image from actually clicking on the image to clicking the upload button.



    <link href="Styles/bootstrap/v4.1.2/bootstrap.min.css" rel="stylesheet" />
    <link href="Styles/cropper.css" rel="stylesheet" />
    <link href="Styles/Site.css" rel="stylesheet" />









    <div class="row">
    <div class="col">
    <video playsinline autoplay></video>
    <canvas id="imageCanvas"></canvas>
    </div>
    </div>

    <div class="row">
    <button>Take snapshot</button>
    <button id="btnUploadImage">Upload Image</button>
    </div>

    <div class="row">

    <label class="label" data-toggle="tooltip" title="Upload A New Image">
    <img class="rounded" id="avatar" src="./Images/Cardholders_72x72.png" alt="avatar">
    <input type="file" class="sr-only" id="input" name="image" accept="image/*">
    </label>

    <!-- Modal -->

    <div class="modal fade" id="modal" tabindex="-1" role="dialog" aria-labelledby="modalLabel" aria-hidden="true">
    <div class="modal-dialog" role="document">
    <div class="modal-content">
    <div class="modal-header">
    <h5 class="modal-title" id="modalLabel">Crop your image.</h5>
    <button type="button" class="close" data-dismiss="modal" aria-label="Close">
    <span aria-hidden="true">&times;</span>
    </button>
    </div>
    <div class="modal-body">
    <div class="img-container">
    <img id="image" src="./Images/Cardholders_72x72.png">
    </div>
    </div>
    <div class="modal-footer">
    <button type="button" class="btn btn-danger" data-dismiss="modal">Cancel</button>
    <button type="button" class="btn btn-primary" id="crop">Crop</button>
    </div>
    </div>
    </div>
    </div>

    </div>




    <script src="Scripts/jquery-3.3.1.min.js"></script>
    <script src="Scripts/bootstrap.bundle.min.js"></script>
    <script src="Scripts/cropper.js"></script>

    <!-- This Script is for the Cropper -->
    <script>
    window.addEventListener('DOMContentLoaded', function ()
    {
    var avatar = document.getElementById('avatar');
    var image = document.getElementById('image');
    var input = document.getElementById('input');

    var $modal = $('#modal');
    var cropper;

    input.addEventListener('change', function (e)
    {
    var files = e.target.files;

    var done = function (url) {
    input.value = '';
    image.src = url;
    $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();

    canvas.toBlob(function (blob)
    {
    var formData = new FormData();

    formData.append('avatar', blob, 'avatar.jpg');

    });
    }
    });
    });
    </script>

    <!-- This script is for the camera and snapshot -->
    <script>

    'use strict';

    // Put variables in global scope to make them available to the browser console.
    const video = document.querySelector('video');
    const canvas = window.canvas = document.querySelector('canvas');
    canvas.width = 480;
    canvas.height = 360;

    const button = document.querySelector('button');

    button.onclick = function ()
    {
    canvas.width = video.videoWidth;
    canvas.height = video.videoHeight;
    canvas.getContext('2d').drawImage(video, 0, 0, canvas.width, canvas.height);
    };

    var constraints = {
    audio: false,
    video: {
    width: { min: 320, ideal: 320, max: 640 },
    height: { min: 400, ideal: 400, max: 480 },
    aspectRatio: { ideal: 1.25 }
    }
    };

    function handleSuccess(stream) {
    window.stream = stream; // make stream available to browser console
    video.srcObject = stream;
    }

    function handleError(error) {
    console.log('navigator.getUserMedia error: ', error);
    }

    navigator.mediaDevices.getUserMedia(constraints).then(handleSuccess).catch(handleError);

    </script>














share|improve this question


























    up vote
    1
    down vote

    favorite












    I have a testbed for CropperJS - I have included a working sample. It displays your camera, and when you click take a snapshot, it copied the current image to the canvas. However, I cannot get the following to work:




    1. When the image is cropped, I need to put the cropped image in the canvas instead of the image control.


    2. I need to move the upload an image from actually clicking on the image to clicking the upload button.



      <link href="Styles/bootstrap/v4.1.2/bootstrap.min.css" rel="stylesheet" />
      <link href="Styles/cropper.css" rel="stylesheet" />
      <link href="Styles/Site.css" rel="stylesheet" />









      <div class="row">
      <div class="col">
      <video playsinline autoplay></video>
      <canvas id="imageCanvas"></canvas>
      </div>
      </div>

      <div class="row">
      <button>Take snapshot</button>
      <button id="btnUploadImage">Upload Image</button>
      </div>

      <div class="row">

      <label class="label" data-toggle="tooltip" title="Upload A New Image">
      <img class="rounded" id="avatar" src="./Images/Cardholders_72x72.png" alt="avatar">
      <input type="file" class="sr-only" id="input" name="image" accept="image/*">
      </label>

      <!-- Modal -->

      <div class="modal fade" id="modal" tabindex="-1" role="dialog" aria-labelledby="modalLabel" aria-hidden="true">
      <div class="modal-dialog" role="document">
      <div class="modal-content">
      <div class="modal-header">
      <h5 class="modal-title" id="modalLabel">Crop your image.</h5>
      <button type="button" class="close" data-dismiss="modal" aria-label="Close">
      <span aria-hidden="true">&times;</span>
      </button>
      </div>
      <div class="modal-body">
      <div class="img-container">
      <img id="image" src="./Images/Cardholders_72x72.png">
      </div>
      </div>
      <div class="modal-footer">
      <button type="button" class="btn btn-danger" data-dismiss="modal">Cancel</button>
      <button type="button" class="btn btn-primary" id="crop">Crop</button>
      </div>
      </div>
      </div>
      </div>

      </div>




      <script src="Scripts/jquery-3.3.1.min.js"></script>
      <script src="Scripts/bootstrap.bundle.min.js"></script>
      <script src="Scripts/cropper.js"></script>

      <!-- This Script is for the Cropper -->
      <script>
      window.addEventListener('DOMContentLoaded', function ()
      {
      var avatar = document.getElementById('avatar');
      var image = document.getElementById('image');
      var input = document.getElementById('input');

      var $modal = $('#modal');
      var cropper;

      input.addEventListener('change', function (e)
      {
      var files = e.target.files;

      var done = function (url) {
      input.value = '';
      image.src = url;
      $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();

      canvas.toBlob(function (blob)
      {
      var formData = new FormData();

      formData.append('avatar', blob, 'avatar.jpg');

      });
      }
      });
      });
      </script>

      <!-- This script is for the camera and snapshot -->
      <script>

      'use strict';

      // Put variables in global scope to make them available to the browser console.
      const video = document.querySelector('video');
      const canvas = window.canvas = document.querySelector('canvas');
      canvas.width = 480;
      canvas.height = 360;

      const button = document.querySelector('button');

      button.onclick = function ()
      {
      canvas.width = video.videoWidth;
      canvas.height = video.videoHeight;
      canvas.getContext('2d').drawImage(video, 0, 0, canvas.width, canvas.height);
      };

      var constraints = {
      audio: false,
      video: {
      width: { min: 320, ideal: 320, max: 640 },
      height: { min: 400, ideal: 400, max: 480 },
      aspectRatio: { ideal: 1.25 }
      }
      };

      function handleSuccess(stream) {
      window.stream = stream; // make stream available to browser console
      video.srcObject = stream;
      }

      function handleError(error) {
      console.log('navigator.getUserMedia error: ', error);
      }

      navigator.mediaDevices.getUserMedia(constraints).then(handleSuccess).catch(handleError);

      </script>














    share|improve this question
























      up vote
      1
      down vote

      favorite









      up vote
      1
      down vote

      favorite











      I have a testbed for CropperJS - I have included a working sample. It displays your camera, and when you click take a snapshot, it copied the current image to the canvas. However, I cannot get the following to work:




      1. When the image is cropped, I need to put the cropped image in the canvas instead of the image control.


      2. I need to move the upload an image from actually clicking on the image to clicking the upload button.



        <link href="Styles/bootstrap/v4.1.2/bootstrap.min.css" rel="stylesheet" />
        <link href="Styles/cropper.css" rel="stylesheet" />
        <link href="Styles/Site.css" rel="stylesheet" />









        <div class="row">
        <div class="col">
        <video playsinline autoplay></video>
        <canvas id="imageCanvas"></canvas>
        </div>
        </div>

        <div class="row">
        <button>Take snapshot</button>
        <button id="btnUploadImage">Upload Image</button>
        </div>

        <div class="row">

        <label class="label" data-toggle="tooltip" title="Upload A New Image">
        <img class="rounded" id="avatar" src="./Images/Cardholders_72x72.png" alt="avatar">
        <input type="file" class="sr-only" id="input" name="image" accept="image/*">
        </label>

        <!-- Modal -->

        <div class="modal fade" id="modal" tabindex="-1" role="dialog" aria-labelledby="modalLabel" aria-hidden="true">
        <div class="modal-dialog" role="document">
        <div class="modal-content">
        <div class="modal-header">
        <h5 class="modal-title" id="modalLabel">Crop your image.</h5>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
        <span aria-hidden="true">&times;</span>
        </button>
        </div>
        <div class="modal-body">
        <div class="img-container">
        <img id="image" src="./Images/Cardholders_72x72.png">
        </div>
        </div>
        <div class="modal-footer">
        <button type="button" class="btn btn-danger" data-dismiss="modal">Cancel</button>
        <button type="button" class="btn btn-primary" id="crop">Crop</button>
        </div>
        </div>
        </div>
        </div>

        </div>




        <script src="Scripts/jquery-3.3.1.min.js"></script>
        <script src="Scripts/bootstrap.bundle.min.js"></script>
        <script src="Scripts/cropper.js"></script>

        <!-- This Script is for the Cropper -->
        <script>
        window.addEventListener('DOMContentLoaded', function ()
        {
        var avatar = document.getElementById('avatar');
        var image = document.getElementById('image');
        var input = document.getElementById('input');

        var $modal = $('#modal');
        var cropper;

        input.addEventListener('change', function (e)
        {
        var files = e.target.files;

        var done = function (url) {
        input.value = '';
        image.src = url;
        $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();

        canvas.toBlob(function (blob)
        {
        var formData = new FormData();

        formData.append('avatar', blob, 'avatar.jpg');

        });
        }
        });
        });
        </script>

        <!-- This script is for the camera and snapshot -->
        <script>

        'use strict';

        // Put variables in global scope to make them available to the browser console.
        const video = document.querySelector('video');
        const canvas = window.canvas = document.querySelector('canvas');
        canvas.width = 480;
        canvas.height = 360;

        const button = document.querySelector('button');

        button.onclick = function ()
        {
        canvas.width = video.videoWidth;
        canvas.height = video.videoHeight;
        canvas.getContext('2d').drawImage(video, 0, 0, canvas.width, canvas.height);
        };

        var constraints = {
        audio: false,
        video: {
        width: { min: 320, ideal: 320, max: 640 },
        height: { min: 400, ideal: 400, max: 480 },
        aspectRatio: { ideal: 1.25 }
        }
        };

        function handleSuccess(stream) {
        window.stream = stream; // make stream available to browser console
        video.srcObject = stream;
        }

        function handleError(error) {
        console.log('navigator.getUserMedia error: ', error);
        }

        navigator.mediaDevices.getUserMedia(constraints).then(handleSuccess).catch(handleError);

        </script>














      share|improve this question













      I have a testbed for CropperJS - I have included a working sample. It displays your camera, and when you click take a snapshot, it copied the current image to the canvas. However, I cannot get the following to work:




      1. When the image is cropped, I need to put the cropped image in the canvas instead of the image control.


      2. I need to move the upload an image from actually clicking on the image to clicking the upload button.



        <link href="Styles/bootstrap/v4.1.2/bootstrap.min.css" rel="stylesheet" />
        <link href="Styles/cropper.css" rel="stylesheet" />
        <link href="Styles/Site.css" rel="stylesheet" />









        <div class="row">
        <div class="col">
        <video playsinline autoplay></video>
        <canvas id="imageCanvas"></canvas>
        </div>
        </div>

        <div class="row">
        <button>Take snapshot</button>
        <button id="btnUploadImage">Upload Image</button>
        </div>

        <div class="row">

        <label class="label" data-toggle="tooltip" title="Upload A New Image">
        <img class="rounded" id="avatar" src="./Images/Cardholders_72x72.png" alt="avatar">
        <input type="file" class="sr-only" id="input" name="image" accept="image/*">
        </label>

        <!-- Modal -->

        <div class="modal fade" id="modal" tabindex="-1" role="dialog" aria-labelledby="modalLabel" aria-hidden="true">
        <div class="modal-dialog" role="document">
        <div class="modal-content">
        <div class="modal-header">
        <h5 class="modal-title" id="modalLabel">Crop your image.</h5>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
        <span aria-hidden="true">&times;</span>
        </button>
        </div>
        <div class="modal-body">
        <div class="img-container">
        <img id="image" src="./Images/Cardholders_72x72.png">
        </div>
        </div>
        <div class="modal-footer">
        <button type="button" class="btn btn-danger" data-dismiss="modal">Cancel</button>
        <button type="button" class="btn btn-primary" id="crop">Crop</button>
        </div>
        </div>
        </div>
        </div>

        </div>




        <script src="Scripts/jquery-3.3.1.min.js"></script>
        <script src="Scripts/bootstrap.bundle.min.js"></script>
        <script src="Scripts/cropper.js"></script>

        <!-- This Script is for the Cropper -->
        <script>
        window.addEventListener('DOMContentLoaded', function ()
        {
        var avatar = document.getElementById('avatar');
        var image = document.getElementById('image');
        var input = document.getElementById('input');

        var $modal = $('#modal');
        var cropper;

        input.addEventListener('change', function (e)
        {
        var files = e.target.files;

        var done = function (url) {
        input.value = '';
        image.src = url;
        $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();

        canvas.toBlob(function (blob)
        {
        var formData = new FormData();

        formData.append('avatar', blob, 'avatar.jpg');

        });
        }
        });
        });
        </script>

        <!-- This script is for the camera and snapshot -->
        <script>

        'use strict';

        // Put variables in global scope to make them available to the browser console.
        const video = document.querySelector('video');
        const canvas = window.canvas = document.querySelector('canvas');
        canvas.width = 480;
        canvas.height = 360;

        const button = document.querySelector('button');

        button.onclick = function ()
        {
        canvas.width = video.videoWidth;
        canvas.height = video.videoHeight;
        canvas.getContext('2d').drawImage(video, 0, 0, canvas.width, canvas.height);
        };

        var constraints = {
        audio: false,
        video: {
        width: { min: 320, ideal: 320, max: 640 },
        height: { min: 400, ideal: 400, max: 480 },
        aspectRatio: { ideal: 1.25 }
        }
        };

        function handleSuccess(stream) {
        window.stream = stream; // make stream available to browser console
        video.srcObject = stream;
        }

        function handleError(error) {
        console.log('navigator.getUserMedia error: ', error);
        }

        navigator.mediaDevices.getUserMedia(constraints).then(handleSuccess).catch(handleError);

        </script>











      html5 cropperjs






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      asked Nov 9 at 17:22









      Adamson

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