PHP Remote File download progress bar implementation

download.php

1<?PHP2 //Current file: download.php3 4 $action= @$_get[' Action '];5 6 //get this information yourself7 $remote _url=Get_remote_file_url ();8 $file _size= Get_remote_file_size ($remote _url);9 $tmp _path=Get_tmp_path ();Ten  One Switch($action) { A      Case' Prepare-download ': -         //Download Cache folder -         $download _cache= __dir__. " /download_cache "; the  -         if(!Is_dir($download _cache)) { -             if(false===mkdir($download _cache)) { -                 Exit(' Failed to create download cache folder, please check directory permissions. ‘); +             } -         } +  A         $tmp _path=$download _cache." /update_ ". Time().". Zip; at  -Save_tmp_path ();//Save temporary file address here -  -         returnJsonCompact(' Remote_url ', ' tmp_path ', ' file_size ')); -  -          Break; in  -      Case' Start-download ': to  +         //here detects if the Tmp_path exists -  the         Try { *             Set_time_limit(0); $ Panax Notoginseng             Touch($tmp _path); -  the             //do some log processing. +  A             if($fp=fopen($remote _url, "RB")) { the  +                 if(!$download _FP=fopen($tmp _path, "WB")) { -                     Exit; $                 } $  -                  while(!feof($fp)) { -  the                     if(!file_exists($tmp _path)) { -                         //Cancel Download If temporary file is deletedWuyi                         fclose($download _FP); the  -                         Exit; Wu                     } -  About                     fwrite($download _FP,fread($fp, 1024 * 8), 1024 * 8); $                 } -  -                 fclose($download _FP); -                 fclose($fp); A  +}Else { the                 Exit; -             } $  the}Catch(Exception $e) { theStorage::remove ($tmp _path); the  the             Exit(' Error occurred: '.$e-getMessage ()); -         } in  the         returnJsonCompact(' Tmp_path ')); the  About          Break; the  the      Case' Get-file-size ': the  +         //here detects if the Tmp_path exists -  the         if(file_exists($tmp _path)) {Bayi             //returns the JSON-formatted response the             returnJSON ([' size ' = =filesize($tmp _path)]); the         } -  -          Break; the  the     default: the         #code ... the          Break; -}

Js

1 //I'm not going to give you an example of how to trigger this function2 functionDownloadFile () {3     varFile_size = 0;4     varProgress = 0;5 6Console.log ("Prepared to download");7 8 $.ajax ({9URL: './download.php?action=prepare-download ',TenType: ' GET ', OneDataType: ' JSON ', ABeforesend:function() { -$ (' #update-button '). html (' <i class= ' fa fa-spinner fa-spin ' ></i> preparing '). Prop (' disabled ', ' disabled '); -         }, the     }) -. Done (function(JSON) { - Console.log (JSON); -  +File_size =json.file_size; -  +$ (' #file-size '). HTML (file_size); A  at         //Show progress bar -  -Console.log ("Started downloading"); - $.ajax ({ -URL: './download.php?action=start-download ', -Type: ' POST ', inDataType: ' JSON ' -         }) to. Done (function(JSON) { +             //set progress to got the response -progress = 100; the  *Console.log ("Downloading finished"); $ Console.log (JSON);Panax Notoginseng         }) - . Fail (showajaxerror); the  +         varinterval_id = Window.setinterval (function() { A  the$ (' #imported-progress '). HTML (progress); +$ ('. Progress-bar '). CSS (' width ', progress+ '% '). attr (' Aria-valuenow '), progress); -  $             if(Progress = = 100) { $ clearinterval (interval_id); -                -                 //until this remote file download is complete, continue with other logic the}Else { - $.ajax ({WuyiURL: './download.php?action=get-file-size ', theType: ' GET ' -                 }) Wu. Done (function(JSON) { -Progress = (Json.size/file_size *). toFixed (2); About                    $ UpdateProgress (progress); -  -Console.log ("Progress:" +progress); -                 }) A . Fail (showajaxerror); +             } the  -}, 300); $  the     }) the . Fail (showajaxerror); the  the}

PHP Remote File download progress bar implementation