裁剪图片并上传

程序员文章站 2022-03-02 12:48:36

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转载自: https://blog.csdn.net/weixin_38023551/article/details/78792400


<!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>
        .row{
            margin-bottom: 5px;
        }
        #photo {
            max-width: 100%;
        }
        .img-preview {
            width: 100px;
            height: 100px;
            overflow: hidden;
        }
        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="row">
        <div class="col-sm-6 col-sm-offset-2">
            <img src="" id="photo">
        </div>
        <div class="col-sm-2">
            <div>
                <p>
                    预览(100*100)：
                </p>
                <div class="img-preview">
                </div>
            </div>
            <button class="btn btn-primary" 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: 140/37, // 纵横比
			viewMode: 2,
			restore: true,  //在调整窗口大小后恢复裁剪的区域
			movable: true,  //是否允许可以移动后面的图片
			center: true,   //裁剪框在图片正中心
			scalable: true, //是否允许缩放图像
			zoomable: true, //是否允许放大图像
			cropBoxResizable: false,  //不允许改变裁切框大小
			toggleDragModeOnDblclick: true, //点击两次时可以在“crop”和“move”之间切换拖拽模式
			minCropBoxWidth: 140,   	     //裁剪层的最小宽度
			minCropBoxHeight: 37, 			 //裁剪层的最小gao度
			autoCropArea: 140/37, //定义自动裁剪面积大小(百分比)和图片进行对比
			//dragMode:move,
			preview: '.img-preview' // 预览图的class名
			//crop: function (e) {
			//	console.log("正在调试"+e);
			//}
		};
		$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:140, // 裁剪后的长宽
			height:37
		}).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>

带模态框的第二个:


<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<title>上传头像</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 type="text/css">
    #up_logo_box{
        text-align: center;
    }
    #up_logo_box #user-photo {
        width:300px;
        height:300px;
        margin-top: 10px;
    }
    #up_logo_box #photo {
        max-width:100%;
        max-height:350px;
    }
    #up_logo_box .img-preview-box {
        text-align: center;
    }
    #up_logo_box .img-preview-box > div {
        display: inline-block;;
        margin-right: 10px;
    }
    #up_logo_box .img-preview {
        overflow: hidden;
    }
    #up_logo_box .img-preview-box .img-preview-lg {
        width: 150px;
        height: 150px;
    }
    #up_logo_box .img-preview-box .img-preview-md {
        width: 100px;
        height: 100px;
    }
    #up_logo_box .img-preview-box .img-preview-sm {
        width: 50px;
        height: 50px;
        border-radius: 50%;
    }
</style>
</head>
<body

	<div id="up_logo_box">	
		<button class="btn btn-primary" data-target="#changeModal" data-toggle="modal">打开</button><br/>
		<img id="user-photo" src="">	
	</div>	
	
	
	<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 type="text/javascript">
		var initCropperInModal = function(img, input, modal){
			var $image = img;
			var $inputImage = input;
			var $modal = modal;
			var options = {
				//aspectRatio: 1, // 纵横比
				aspectRatio: 140/37, // 纵横比
				viewMode: 2,
				preview: '.img-preview' // 预览图的class名
			};
			// 模态框隐藏后需要保存的数据对象
			var saveData = {};
			var URL = window.URL || window.webkitURL;
			var blobURL;
			$modal.on('show.bs.modal',function () {
				// 如果打开模态框时没有选择文件就点击“打开图片”按钮
				if(!$inputImage.val()){
					$inputImage.click();
				}
			}).on('shown.bs.modal', function () {
				// 重新创建
				$image.cropper( $.extend(options, {
					ready: function () {
						// 当剪切界面就绪后，恢复数据
						if(saveData.canvasData){
							$image.cropper('setCanvasData', saveData.canvasData);
							$image.cropper('setCropBoxData', saveData.cropBoxData);
						}
					}
				}));
			}).on('hidden.bs.modal', function () {
				// 保存相关数据
				saveData.cropBoxData = $image.cropper('getCropBoxData');
				saveData.canvasData = $image.cropper('getCanvasData');
				// 销毁并将图片保存在img标签
				$image.cropper('destroy').attr('src',blobURL);
			});
			if (URL) {
				$inputImage.change(function() {
					var files = this.files;
					var file;
					if (!$image.data('cropper')) {
						return;
					}
					if (files && files.length) {
						file = files[0];
						if (/^image\/\w+$/.test(file.type)) {
		 
							if(blobURL) {
								URL.revokeObjectURL(blobURL);
							}
							blobURL = URL.createObjectURL(file);
		 
							// 重置cropper，将图像替换
							$image.cropper('reset').cropper('replace', blobURL);
		 
							// 选择文件后，显示和隐藏相关内容
							$('.img-container').removeClass('hidden');
							$('.img-preview-box').removeClass('hidden');
							$('#changeModal .disabled').removeAttr('disabled').removeClass('disabled');
							$('#changeModal .tip-info').addClass('hidden');
		 
						} else {
							window.alert('请选择一个图像文件！');
						}
					}
				});
			} else {
				$inputImage.prop('disabled', true).addClass('disabled');
			}
		}
	 
		var sendPhoto = function(){
			$('#photo').cropper('getCroppedCanvas',{
				width:300,
				height:300
			}).toBlob(function(blob){
				// 转化为blob后更改src属性，隐藏模态框
				$('#user-photo').attr('src',URL.createObjectURL(blob));
				$('#changeModal').modal('hide');
			});
		}
	 
		$(function(){
			initCropperInModal($('#photo'),$('#photoInput'),$('#changeModal'));
		});
	</script>
</body>
</html>

<div class="modal fade" id="changeModal" tabindex="-1" role="dialog" aria-hidden="true">		
	<div class="modal-dialog">
		<div class="modal-content">
			<div class="modal-header">
				<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
				<h4 class="modal-title text-primary">
				<i class="fa fa-pencil"></i>
							更换头像
				</h4>
			</div>
			<div class="modal-body">
				<p class="tip-info text-center">
					未选择图片
				</p>
				<div class="img-container hidden">
					<img src="" alt="" id="photo">
				</div>
				<div class="img-preview-box hidden">
					<hr>
					<span>150*150:</span>
					<div class="img-preview img-preview-lg">
					</div>
					<span>100*100:</span>
					<div class="img-preview img-preview-md">
					</div>
					<span>30*30:</span>
					<div class="img-preview img-preview-sm">
					</div>
				</div>
			</div>
			<div class="modal-footer">
				<label class="btn btn-danger pull-left" for="photoInput">
				<input type="file" class="sr-only" id="photoInput" accept="image/*">
				<span>打开图片</span>
				</label>
				<button class="btn btn-primary disabled" disabled="true" onclick="sendPhoto();">提交</button>
				<button class="btn btn-close" aria-hidden="true" data-dismiss="modal">取消</button>
			</div>
		</div>
	</div>
</div>

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