zoukankan      html  css  js  c++  java
  • 多图片上传预览效果

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Document</title>
        <script src="jquery-2.1.4.min.js"></script>
    </head>
    <body>
        <script>
    
        //下面用于多图片上传预览功能
        function setImagePreviews(avalue) {
            var docObj = document.getElementById("doc");
            var dd = document.getElementById("dd");
            dd.innerHTML = "";
            var fileList = docObj.files;
            for (var i = 0; i < fileList.length; i++) {            
                dd.innerHTML += "<div style='float:left' > <img id='img" + i + "'  /> </div>";
                var imgObjPreview = document.getElementById("img"+i); 
                if (docObj.files && docObj.files[i]) {
                    //火狐下,直接设img属性
                    imgObjPreview.style.display = 'block';
                    imgObjPreview.style.width = '150px';
                    imgObjPreview.style.height = '180px';
                    //imgObjPreview.src = docObj.files[0].getAsDataURL();
                    //火狐7以上版本不能用上面的getAsDataURL()方式获取,需要一下方式
                    imgObjPreview.src = window.URL.createObjectURL(docObj.files[i]);
                }
                else {
                    //IE下,使用滤镜
                    docObj.select();
                    var imgSrc = document.selection.createRange().text;
                    alert(imgSrc)
                    var localImagId = document.getElementById("img" + i);
                    //必须设置初始大小
                    localImagId.style.width = "150px";
                    localImagId.style.height = "180px";
                    //图片异常的捕捉,防止用户修改后缀来伪造图片
                    try {
                        localImagId.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)";
                        localImagId.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = imgSrc;
                    }
                    catch (e) {
                        alert("您上传的图片格式不正确,请重新选择!");
                        return false;
                    }
                    imgObjPreview.style.display = 'none';
                    document.selection.empty();
                }
            }  
            return true;
        }
        </script>
    
        <input type="file" name="file" id="doc" multiple="multiple" style="150px;" onchange="javascript:setImagePreviews();" accept="image">
    
        <div id="dd" style=" 990px;"></div>
    
    </body>
    </html>
    

      

  • 相关阅读:
    tensorflow2知识总结---3、逻辑回归与交叉熵
    tensorflow2知识总结---2、多层感知器实例
    日常英语---200720(感知器:perceptron)
    日常英语---200720(numpy怎么读)
    日常英语---200720(tensorflow2优化函数:model.compile(optimizer='adam',loss='binary_crossentropy',metrics=['acc']))
    tensorflow2知识总结---1、线性回归实例
    Guid.ToString Method
    Intercept HTTP requests
    Fetch API
    古墓惊魂 关卡奖励的宝藏
  • 原文地址:https://www.cnblogs.com/qhorse/p/5340316.html
Copyright © 2011-2022 走看看