Created
July 1, 2019 15:02
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File Data Read using Javascript (Client Side)
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| <html> | |
| <head> | |
| <meta http-equiv='Content-type' content='text/html;charset=UTF-8' > | |
| <script> | |
| function startRead() | |
| { | |
| // obtain input element through DOM | |
| var file = document.getElementById('file').files[0]; | |
| if(file) | |
| { | |
| getAsText(file); | |
| } | |
| } | |
| function getAsText(readFile) | |
| { | |
| var reader; | |
| try | |
| { | |
| reader = new FileReader(); | |
| }catch(e) | |
| { | |
| document.getElementById('output').innerHTML = | |
| "Error: seems File API is not supported on your browser"; | |
| return; | |
| } | |
| // Read file into memory as UTF-8 | |
| reader.readAsText(readFile, "UTF-8"); | |
| // Handle progress, success, and errors | |
| reader.onprogress = updateProgress; | |
| reader.onload = loaded; | |
| reader.onerror = errorHandler; | |
| } | |
| function updateProgress(evt) | |
| { | |
| if (evt.lengthComputable) | |
| { | |
| // evt.loaded and evt.total are ProgressEvent properties | |
| var loaded = (evt.loaded / evt.total); | |
| if (loaded < 1) | |
| { | |
| // Increase the prog bar length | |
| // style.width = (loaded * 200) + "px"; | |
| document.getElementById("bar").style.width = (loaded*100) + "%"; | |
| } | |
| } | |
| } | |
| function loaded(evt) | |
| { | |
| // Obtain the read file data | |
| var fileString = evt.target.result; | |
| document.getElementById('output').innerHTML = fileString; | |
| document.getElementById("bar").style.width = 100 + "%"; | |
| } | |
| function errorHandler(evt) | |
| { | |
| if(evt.target.error.code == evt.target.error.NOT_READABLE_ERR) | |
| { | |
| // The file could not be read | |
| document.getElementById('output').innerHTML = "Error reading file..." | |
| } | |
| } | |
| </script> | |
| </head> | |
| <body> | |
| <input id="file" type="file" multiple onchange="startRead()"> | |
| <h3>Progress:</h3> | |
| <div style="width:100%;height:20px;border:1px solid black;"> | |
| <div id="bar" style="background-color:#45F;width:0px;height:20px;"></div> | |
| </div> | |
| <h3>File contents:</h3> | |
| <pre> | |
| <code id="output"> | |
| </code> | |
| </pre> | |
| </body> | |
| </html> |
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