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Use Html5 to implement asynchronous file upload, support cross-domain, and upload progress bar

高洛峰Original: 2017-03-24 15:27:152540browse

The following editor will bring you an article that uses Html5 to upload files asynchronously, supports cross-domain, and has an upload progress bar. The editor thinks it is quite good, so I will share it with you now and give it as a reference for everyone. Let’s follow the editor and take a look.

Server preparation IIS

You need to set the HTTP response header in IIS, as shown in the figure, add the following settings , add this "Access-Control-Allow-Origin". Only by adding this line can you support cross-domain, otherwise Chrome browser will report an error

Use Html5 to implement asynchronous file upload, support cross-domain, and upload progress bar

Page code:

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<!DOCTYPE html>  
<html>  
<head>  
    <meta http-equiv="content-type" content="text/html;charset=utf-8">  
    <meta name="format-detection" content="telephone=no">  
    <meta name="msapplication-tap-highlight" content="no">  
    <meta name="viewport" content="user-scalable=no, initial-scale=1, maximum-scale=1, minimum-scale=1, width=device-width">  
    <title>Html5上传文件</title>  
</head>  
<body>  
    <p class="app">  
        <h1>Html5上传文件测试，带进度条</h1>  
        <p>  
            <input type="file" value="" id="fileInput" name="files" onchange="fileSelected()" />  
            <p style="margin:30px;">  
                <input type="button" value="上传" onclick="uploadFile()" />  
            </p>  
            <p style="margin:30px;">  
                <p id="fileName"></p>  
                <p id="fileSize"></p>  
                <p id="fileType"></p>  
            </p>  
            <p style="margin:30px;width:500px;height:15px;border:1px solid #aeaeae;">  
                <p id="progress" style="background:#4cff00;height:15px;width:0%;"></p>  
                <p id="percentNumber"></p>  
            </p>  
            <p style="margin:30px;">  
                <p id="msg"></p>  
            </p>  
        </p>  
    </p>  
    <script type="text/javascript">  
        function fileSelected() {   
            //重置状态显示   
            document.getElementById("msg").innerHTML = "";   
            document.getElementById(&#39;percentNumber&#39;).innerHTML = &#39;&#39;;   
            document.getElementById("progress").style.width = "0%";   
            var file = document.getElementById(&#39;fileInput&#39;).files[0];   
            if (file) {   
                var fileSize = 0;   
                if (file.size > 1024 * 1024)   
                    fileSize = (Math.round(file.size * 100 / (1024 * 1024)) / 100).toString() + &#39;MB&#39;;   
                else   
                    fileSize = (Math.round(file.size * 100 / 1024) / 100).toString() + &#39;KB&#39;;   
                document.getElementById(&#39;fileName&#39;).innerHTML = &#39;Name: &#39; + file.name;   
                document.getElementById(&#39;fileSize&#39;).innerHTML = &#39;Size: &#39; + fileSize;   
                document.getElementById(&#39;fileType&#39;).innerHTML = &#39;Type: &#39; + file.type;   
            }   
        }   
  
  
        function uploadFile() {   
            var fd = new FormData();   
            fd.append("fileInput", document.getElementById(&#39;fileInput&#39;).files[0]);   
            var xhr = new XMLHttpRequest();   
            xhr.upload.addEventListener("progress", uploadProgress, false);   
            xhr.addEventListener("load", uploadComplete, false);   
            xhr.addEventListener("error", uploadFailed, false);   
            xhr.addEventListener("abort", uploadCanceled, false);               
            xhr.open("POST", "http://10.0.0.200:9001/Home/Upload");//修改为自己服务器接口地址   
            //xhr.setRequestHeader("Access-Control-Allow-Origin", "*");//需要在IIS里面配置，就可以跨域请求了   
            //xhr.setRequestHeader("Content-Type", "multipart/form-data");   
            xhr.send(fd);   
        }   
        function uploadProgress(evt) {   
            if (evt.lengthComputable) {   
                var percentComplete = Math.round(evt.loaded * 100 / evt.total);   
                document.getElementById(&#39;percentNumber&#39;).innerHTML = percentComplete + &#39;%&#39;;   
                var jindutiao = document.getElementById("progress");   
                jindutiao.style.width = percentComplete + "%";   
            }   
            else {   
                document.getElementById(&#39;percentNumber&#39;).innerHTML = &#39;不支持进度计算&#39;;   
            }   
        }   
        function uploadComplete(evt) {   
            //evt.target.responseText   
            document.getElementById("msg").innerHTML = "上传成功";   
        }   
        function uploadFailed(evt) {   
            document.getElementById("msg").innerHTML = "上传过程中有一个错误";   
        }   
        function uploadCanceled(evt) {   
            document.getElementById("msg").innerHTML = "用户取消了上传或者浏览器删除了连接";   
        }   
    </script>  
</body>  
</html>

The above article uses Html5 to implement asynchronous file upload, supports cross-domain, and has an upload progress bar. This is all the content shared by the editor. I hope it can give you a reference, and I also hope that everyone will support PHP. Chinese website.

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