如何改变fengyuanchen / cropper JS（农作物头像）的纵横比

Question

您好我想在我的系统中使用fengyuanchen / cropper JS（Crop Avatar）。但我无法改变每页的宽高比。因为纵横比是在带有jquery的main.js文件上。

所以我想确定index.html中的apect比率

这是代码

main.js（PS：宽高比在第201行。）

(function (factory) {
  if (typeof define === 'function' && define.amd) {
    // AMD. Register as anonymous module.
    define(['jquery'], factory);
  } else if (typeof exports === 'object') {
    // Node / CommonJS
    factory(require('jquery'));
  } else {
    // Browser globals.
    factory(jQuery);
  }
})(function ($) {

  'use strict';

  var console = window.console || { log: function () {} };

  function CropAvatar($element) {
    this.$container = $element;

    this.$avatarView = this.$container.find('.avatar-view');
    this.$avatar = this.$avatarView.find('img');
    this.$avatarModal = this.$container.find('#avatar-modal');
    this.$loading = this.$container.find('.loading');

    this.$avatarForm = this.$avatarModal.find('.avatar-form');
    this.$avatarUpload = this.$avatarForm.find('.avatar-upload');
    this.$avatarSrc = this.$avatarForm.find('.avatar-src');
    this.$avatarData = this.$avatarForm.find('.avatar-data');
    this.$avatarInput = this.$avatarForm.find('.avatar-input');
    this.$avatarSave = this.$avatarForm.find('.avatar-save');
    this.$avatarBtns = this.$avatarForm.find('.avatar-btns');

    this.$avatarWrapper = this.$avatarModal.find('.avatar-wrapper');
    this.$avatarPreview = this.$avatarModal.find('.avatar-preview');

    this.init();
  }

  CropAvatar.prototype = {
    constructor: CropAvatar,

    support: {
      fileList: !!$('<input type="file">').prop('files'),
      blobURLs: !!window.URL && URL.createObjectURL,
      formData: !!window.FormData
    },

    init: function () {
      this.support.datauri = this.support.fileList && this.support.blobURLs;

      if (!this.support.formData) {
        this.initIframe();
      }

      this.initTooltip();
      this.initModal();
      this.addListener();
    },

    addListener: function () {
      this.$avatarView.on('click', $.proxy(this.click, this));
      this.$avatarInput.on('change', $.proxy(this.change, this));
      this.$avatarForm.on('submit', $.proxy(this.submit, this));
      this.$avatarBtns.on('click', $.proxy(this.rotate, this));
    },

    initTooltip: function () {
      this.$avatarView.tooltip({
        placement: 'bottom'
      });
    },

    initModal: function () {
      this.$avatarModal.modal({
        show: false
      });
    },

    initPreview: function () {
      var url = this.$avatar.attr('src');

      this.$avatarPreview.html('<img src="' + url + '">');
    },

    initIframe: function () {
      var target = 'upload-iframe-' + (new Date()).getTime();
      var $iframe = $('<iframe>').attr({
            name: target,
            src: ''
          });
      var _this = this;

      // Ready ifrmae
      $iframe.one('load', function () {

        // respond response
        $iframe.on('load', function () {
          var data;

          try {
            data = $(this).contents().find('body').text();
          } catch (e) {
            console.log(e.message);
          }

          if (data) {
            try {
              data = $.parseJSON(data);
            } catch (e) {
              console.log(e.message);
            }

            _this.submitDone(data);
          } else {
            _this.submitFail('Image upload failed!');
          }

          _this.submitEnd();

        });
      });

      this.$iframe = $iframe;
      this.$avatarForm.attr('target', target).after($iframe.hide());
    },

    click: function () {
      this.$avatarModal.modal('show');
      this.initPreview();
    },

    change: function () {
      var files;
      var file;

      if (this.support.datauri) {
        files = this.$avatarInput.prop('files');

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

          if (this.isImageFile(file)) {
            if (this.url) {
              URL.revokeObjectURL(this.url); // Revoke the old one
            }

            this.url = URL.createObjectURL(file);
            this.startCropper();
          }
        }
      } else {
        file = this.$avatarInput.val();

        if (this.isImageFile(file)) {
          this.syncUpload();
        }
      }
    },

    submit: function () {
      if (!this.$avatarSrc.val() && !this.$avatarInput.val()) {
        return false;
      }

      if (this.support.formData) {
        this.ajaxUpload();
        return false;
      }
    },

    rotate: function (e) {
      var data;

      if (this.active) {
        data = $(e.target).data();

        if (data.method) {
          this.$img.cropper(data.method, data.option);
        }
      }
    },

    isImageFile: function (file) {
      if (file.type) {
        return /^image\/\w+$/.test(file.type);
      } else {
        return /\.(jpg|jpeg|png|gif)$/.test(file);
      }
    },

    startCropper: function () {
      var _this = this;

      if (this.active) {
        this.$img.cropper('replace', this.url);
      } else {
        this.$img = $('<img src="' + this.url + '">');
        this.$avatarWrapper.empty().html(this.$img);
        this.$img.cropper({
          aspectRatio: 1,
          preview: this.$avatarPreview.selector,
          crop: function (e) {
            var json = [
                  '{"x":' + e.x,
                  '"y":' + e.y,
                  '"height":' + e.height,
                  '"width":' + e.width,
                  '"rotate":' + e.rotate + '}'
                ].join();

            _this.$avatarData.val(json);
          }
        });

        this.active = true;
      }

      this.$avatarModal.one('hidden.bs.modal', function () {
        _this.$avatarPreview.empty();
        _this.stopCropper();
      });
    },

    stopCropper: function () {
      if (this.active) {
        this.$img.cropper('destroy');
        this.$img.remove();
        this.active = false;
      }
    },

    ajaxUpload: function () {
      var url = this.$avatarForm.attr('action');
      var data = new FormData(this.$avatarForm[0]);
      var _this = this;

      $.ajax(url, {
        type: 'post',
        data: data,
        dataType: 'json',
        processData: false,
        contentType: false,

        beforeSend: function () {
          _this.submitStart();
        },

        success: function (data) {
          _this.submitDone(data);
        },

        error: function (XMLHttpRequest, textStatus, errorThrown) {
          _this.submitFail(textStatus || errorThrown);
        },

        complete: function () {
          _this.submitEnd();
        }
      });
    },

    syncUpload: function () {
      this.$avatarSave.click();
    },

    submitStart: function () {
      this.$loading.fadeIn();
    },

    submitDone: function (data) {
      console.log(data);

      if ($.isPlainObject(data) && data.state === 200) {
        if (data.result) {
          this.url = data.result;

          if (this.support.datauri || this.uploaded) {
            this.uploaded = false;
            this.cropDone();
          } else {
            this.uploaded = true;
            this.$avatarSrc.val(this.url);
            this.startCropper();
          }

          this.$avatarInput.val('');
        } else if (data.message) {
          this.alert(data.message);
        }
      } else {
        this.alert('Failed to response');
      }
    },

    submitFail: function (msg) {
      this.alert(msg);
    },

    submitEnd: function () {
      this.$loading.fadeOut();
    },

    cropDone: function () {
      this.$avatarForm.get(0).reset();
      this.$avatar.attr('src', this.url);
      this.stopCropper();
      this.$avatarModal.modal('hide');
    },

    alert: function (msg) {
      var $alert = [
            '<div class="alert alert-danger avatar-alert alert-dismissable">',
              '<button type="button" class="close" data-dismiss="alert">&times;</button>',
              msg,
            '</div>'
          ].join('');

      this.$avatarUpload.after($alert);
    }
  };

  $(function () {
    return new CropAvatar($('#crop-avatar'));
  });

});

这是index.html

<!doctype html>
<html lang="en">

<head>
  <meta charset="utf-8">
  <meta http-equiv="x-ua-compatible" content="ie=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <meta name="description" content="A complete example of Cropper.">
  <meta name="keywords" content="HTML, CSS, JS, JavaScript, jQuery plugin, image cropping, image crop, image move, image zoom, image rotate, image scale, front-end, frontend, web development">
  <meta name="author" content="Fengyuan Chen">
  <title>Cropper</title>
  <link rel="stylesheet" href="../../assets/css/bootstrap.min.css">
  <link rel="stylesheet" href="../../dist/cropper.min.css">
  <link rel="stylesheet" href="css/main.css">

  <!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
  <!--[if lt IE 9]>
    <script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
    <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
  <![endif]-->
</head>

<body>
  <div class="container" id="crop-avatar">

    <!-- Current avatar -->
    <div class="avatar-view" title="Change the avatar">
      <img src="img/picture.jpg" alt="Avatar">
    </div>

    <!-- Cropping modal -->
    <div class="modal fade" id="avatar-modal" aria-hidden="true" aria-labelledby="avatar-modal-label" role="dialog" tabindex="-1">
      <div class="modal-dialog modal-lg">
        <div class="modal-content">
          <form class="avatar-form" action="crop.php" enctype="multipart/form-data" method="post">
            <div class="modal-header">
              <button type="button" class="close" data-dismiss="modal">&times;</button>
              <h4 class="modal-title" id="avatar-modal-label">Change Avatar</h4>
            </div>
            <div class="modal-body">
              <div class="avatar-body">

                <!-- Upload image and data -->
                <div class="avatar-upload">
                  <input type="hidden" class="avatar-src" name="avatar_src">
                  <input type="hidden" class="avatar-data" name="avatar_data">
                  <label for="avatarInput">Local upload</label>
                  <input type="file" class="avatar-input" id="avatarInput" name="avatar_file">
                </div>

                <!-- Crop and preview -->
                <div class="row">
                  <div class="col-md-9">
                    <div class="avatar-wrapper"></div>
                  </div>
                  <div class="col-md-3">
                    <div class="avatar-preview preview-lg"></div>
                    <div class="avatar-preview preview-md"></div>
                    <div class="avatar-preview preview-sm"></div>
                  </div>
                </div>

                <div class="row avatar-btns">
                  <div class="col-md-9">
                    <div class="btn-group">
                      <button type="button" class="btn btn-primary" data-method="rotate" data-option="-90" title="Rotate -90 degrees">Rotate Left</button>
                      <button type="button" class="btn btn-primary" data-method="rotate" data-option="-15">-15deg</button>
                      <button type="button" class="btn btn-primary" data-method="rotate" data-option="-30">-30deg</button>
                      <button type="button" class="btn btn-primary" data-method="rotate" data-option="-45">-45deg</button>
                    </div>
                    <div class="btn-group">
                      <button type="button" class="btn btn-primary" data-method="rotate" data-option="90" title="Rotate 90 degrees">Rotate Right</button>
                      <button type="button" class="btn btn-primary" data-method="rotate" data-option="15">15deg</button>
                      <button type="button" class="btn btn-primary" data-method="rotate" data-option="30">30deg</button>
                      <button type="button" class="btn btn-primary" data-method="rotate" data-option="45">45deg</button>
                    </div>
                  </div>
                  <div class="col-md-3">
                    <button type="submit" class="btn btn-primary btn-block avatar-save">Done</button>
                  </div>
                </div>
              </div>
            </div>
            <!-- <div class="modal-footer">
              <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
            </div> -->
          </form>
        </div>
      </div>
    </div>
    <!-- /.modal -->

    <!-- Loading state -->
    <div class="loading" aria-label="Loading" role="img" tabindex="-1"></div>
  </div>

  <script src="../../assets/js/jquery.min.js"></script>
  <script src="../../assets/js/bootstrap.min.js"></script>
  <script src="../../dist/cropper.min.js"></script>
  <script src="js/main.js"></script>
</body>

</html>

Answer 1

<script type="text/javascript">

    // initial set up
    var $image = $('.cropper > img');
    var options = {
        aspectRatio: 16/9, // (1.7777)
        etc...,
        etc...
    };

    // initialize
    $image.cropper(options); 

    // toggle aspect ratio after initialization
    $(document).on('click', '#toggle-aspect-ratio .btn', function () {
        options.aspectRatio = $(this).attr('data-value'); 
        $image.cropper('destroy').cropper(options);
    });


</script>

<div id="toggle-aspect-ratio">
    <span class="btn" data-value="NaN">Freeform</span>
    <span class="btn" data-value="1.77777">16/9</span>
    <span class="btn" data-value="1.33333">4/3</span>
</div>

注意： $（此）.attr（＆＃39;数据值＆＃39;）（或其他）必须为数字/小数（例如： 1.33333）和不一个字符串（例如：4/3）或它将读作NaN。

Answer 2

以下代码是更改默认设置 - ＆gt;有关更多详细信息，请参阅Read.me文件@ https://github.com/fengyuanchen/cropper。

    <script type="text/javascript">

     $.fn.cropper.setDefaults(
      {
       aspectRatio: 1, //// or 1.7777777777 (16/9) or any positive nubmer
      });

    </script>