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JS native upload large file display progress bar-php upload file

一个新手Original: 2017-10-14 10:30:561407browse

##Modify the required size in php.ini:
upload_max_filesize = 8M
post_max_size = 10M
memory_limit = 20M

<!DOCTYPE html><html><head>
    <title>原生JS大文件显示进度条</title>
    <meta charset="UTF-8">
    <style type="text/css">
        #parent{position: relative;width: 500px;height:20px;border:1px solid #ccc;display: none;border-radius:20px}
        #child{position: absolute;width:0%;height:20px;background: #5FB878;display: none;line-height: 20px;color: #ffffff;font-size: 12px;border-radius:20px}
    </style>
    <script type="text/javascript">
        function $(id){            
        return document.getElementById(id);
        }    </script></head><body>
    <form action="" method="post">
        <p id="parent">
            <p id="child"></p>
        </p>
        <p>上传文件:<input type="file" name="file"></p>    
        <p><input type="submit" value="提交" id="submit"></p>
    </form>
    <script type="text/javascript">
        var oForm = document.getElementsByTagName(&#39;form&#39;)[0];        
        var oSubmit = $(&#39;submit&#39;);        //如果多个人同时提交这个表单的时候，由于是异步的请求，互不影响        
        oSubmit.onclick = function(){            
        try{                
        var xhr = new XMLHttpRequest();
            }catch(e){                
            var xhr = new ActiveXObject("Msxml2.XMLHTTP");
            }
            xhr.upload.onprogress = function(e){                
            var ev = e || window.event;                
            var percent = Math.floor((ev.loaded / ev.total)*100);        
                // console.log(percent);
                //将百分比显示到进度条                
                $(&#39;parent&#39;).style.display = &#39;block&#39;;
                $(&#39;child&#39;).style.display = &#39;block&#39;;                //将上传进度的百分比显示到child里面                $(&#39;child&#39;).style.width = percent+&#39;%&#39;;
                $(&#39;child&#39;).style.textAlign = &#39;center&#39;;
                $(&#39;child&#39;).innerHTML = percent+&#39;%&#39;;                //判断如果百分比到达100%时候，隐藏掉
                if(percent==100){
                    $(&#39;parent&#39;).style.display = &#39;none&#39;;
                    $(&#39;child&#39;).style.display = &#39;none&#39;;
                }
            }
            xhr.open(&#39;post&#39;,&#39;progress.php&#39;,true);            
            var form = new FormData(oForm);
            xhr.send(form);
            xhr.onreadystatechange = function(){                
            if(xhr.readyState==4 && xhr.status==200){
                    eval("var obj ="+xhr.responseText);                    
                    if(obj.status){
                        alert(&#39;上传成功&#39;);
                    }else{
                        alert(&#39;上传失败&#39;);
                    }
                }
            }            //阻止表单提交
            return false;
        }    </script></body></html>

<?php    //开始上传
    //注意：文件是windows系统的文件，采用的gbk编码，php文件使用的是utf-8编码
    //我们不能直接修改文件的编码，只能临时修改一下php的编码
    $dst_file = $_FILES[&#39;file&#39;][&#39;name&#39;];    
    $dst_file = iconv(&#39;utf-8&#39;, &#39;gbk&#39;, $dst_file);    
    if(move_uploaded_file($_FILES[&#39;file&#39;][&#39;tmp_name&#39;],$dst_file)){        
    $data[&#39;status&#39;] = 1;
    }else{        
    $data[&#39;status&#39;] = 0;
    }    echo json_encode($data);

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