Na wat onderzoek op internet te hebben gedaan, heb ik ontdekt dat HTML5 JavaScript File API erg handig is om inhoud van het lokale bestandssysteem te lezen. Ik heb een klein script geschreven en het werkt perfect.
Voor dit voorbeeld heb ik twee bestanden gemaakt -
- index.htm
- service.php
index.htm
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Upload large CSV file</title>
<style>
body{font-size:8pt; color:#333}
#wrap{width:500px; margin:5px auto}
#responce{height:200px; overflow-y:scroll; border:1px solid #ddd;}
</style>
</head>
<body>
<div id="wrap">
<ul id="responce">
</ul><!-- // response -->
<input type="file" id="fileSelected"/>
<button id="btnUpload">Upload</button>
</div><!-- // wrap -->
<script
src="https://code.jquery.com/jquery-3.1.1.min.js"
integrity="sha256-hVVnYaiADRTO2PzUGmuLJr8BLUSjGIZsDYGmIJLv2b8="
crossorigin="anonymous"></script>
<script>
var reader_offset = 0; //current reader offset position
var buffer_size = 1024; //
var pending_content = '';
/**
* Read a chunk of data from current offset.
*/
function readAndSendChunk()
{
var reader = new FileReader();
var file = $('#fileSelected')[0].files[0];
reader.onloadend = function(evt){
//check for end of file
if(evt.loaded == 0) return;
//increse offset value
reader_offset += evt.loaded;
//check for only complete line
var last_line_end = evt.target.result.lastIndexOf('\n');
var content = pending_content + evt.target.result.substring(0, last_line_end);
pending_content = evt.target.result.substring(last_line_end+1, evt.target.result.length);
//upload data
send(content);
};
var blob = file.slice(reader_offset, reader_offset + buffer_size);
reader.readAsText(blob);
}
/**
* Send data to server using AJAX
*/
function send(data_chank)
{
$.ajax({
url: "service.php",
method: 'POST',
data: data_chank
}).done(function(response) {
//show responce message received from server
$( '#responce' ).append( '<li>' + response + '</li>');
//try for next chank
readAndSendChunk();
});
}
/**
* On page load
*/
$(function(){
$('#btnUpload').click(function(){
reader_offset = 0;
pending_content = '';
readAndSendChunk();
});
});
</script>
</body>
</html>service.php
<?php
$content = file_get_contents('php://input');
$lines = explode("\n", $content);
foreach($lines as $line){
$csv_row = str_getcsv($line);
//save data into database
//----
}