剪裁正方形图片cropper

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<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<title>裁剪图片</title>
<link href="https://cdn.bootcss.com/cropper/3.1.3/cropper.min.css" rel="stylesheet">
<!--<link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">-->
<style>
        .cropper-view-box{
          border-radius: 50%;
        }
        #photo {
            max-width: 100%;
        }
        .img-preview {
            width: 100px;
            height: 100px;
            overflow: hidden;border-radius: 50%;
        }
        button {
            margin-top:10px;
        }
        #result {
            width: 150px;
            height: 150px;
        }
</style>
</head>
<body>
<div class="container">
    <div class="row">
        <div class="col-sm-12 text-center">
            <label for="input" class="btn btn-danger" id="">
            <span>选择图片</span>
            <input type="file" id="input" class="sr-only">
            </label>
        </div>
    </div>
    <div class="">
        <div class="" style="width:50%">
            <img src="" id="photo" >
        </div>
        <div class="">
            <div>
                <p>
                    预览(100*100)：
                </p>
                <div class="img-preview">
                </div>
            </div>
            <button class="" onclick="crop()">裁剪图片</button>
            <div>
                <br/>
                <p>
                    结果：
                </p>
                <img src="" alt="裁剪结果" id="result">
            </div>
        </div>
    </div>
</div>
<!-- Scripts -->
<script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
<script src="https://cdn.bootcss.com/cropper/3.1.3/cropper.min.js"></script>
<!--<script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>-->
<script>
        // 修改自官方demo的js
        var initCropper = function (img, input){
            var $image = img;
            var options = {
                aspectRatio: 1, // 纵横比
                viewMode: 2,
                preview: '.img-preview' // 预览图的class名
            };
            $image.cropper(options);
            var $inputImage = input;
            var uploadedImageURL;
            if (URL) {
                // 给input添加监听
                $inputImage.change(function () {
                    var files = this.files;
                    var file;
                    if (!$image.data('cropper')) {
                        return;
                    }
                    if (files && files.length) {
                        file = files[0];
                        // 判断是否是图像文件
                        if (/^image\/\w+$/.test(file.type)) {
                            // 如果URL已存在就先释放
                            if (uploadedImageURL) {
                                URL.revokeObjectURL(uploadedImageURL);
                            }
                            uploadedImageURL = URL.createObjectURL(file);
                            // 销毁cropper后更改src属性再重新创建cropper
                            $image.cropper('destroy').attr('src', uploadedImageURL).cropper(options);
                            $inputImage.val('');
                        } else {
                          window.alert('请选择一个图像文件！');
                      }
                  }
              });
            } else {
                $inputImage.prop('disabled', true).addClass('disabled');
            }
        }
        var crop = function(){
            var $image = $('#photo');
            var $target = $('#result');
            $image.cropper('getCroppedCanvas',{
                width:300, // 裁剪后的长宽
                height:300
            }).toBlob(function(blob){
                // 裁剪后将图片放到指定标签
                $target.attr('src', URL.createObjectURL(blob));
            });
        }
        $(function(){
            initCropper($('#photo'),$('#input'));
        });
    </script>
</body>
</html>

　　

posted @   枫若  阅读(69)  评论(0)  编辑  收藏  举报
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