Getting Rich with PHP 5 |
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2024-11-20 |
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22 |
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Ajax Upload
<?php
if($_SERVER['REQUEST_METHOD']=='POST') {
print_r($_POST); print_r($_FILES); exit;
} ?>
<html><head>
<script type="text/javascript" src="/yui/yahoo.js"></script>
<script type="text/javascript" src="/yui/connection.js"></script>
<script type="text/javascript">
var fN = function callBack(o) {
var result = document.getElementById('result');
result.innerHTML='<pre>'+o.responseText+'</pre>';
}
var callback = { success:fN, upload:fN }
function postForm(target,formName,up) {
YAHOO.util.Connect.setForm(formName,up);
YAHOO.util.Connect.asyncRequest('POST',target,callback);
}
</script>
</head>
<body>
<form enctype="multipart/form-data" id="upload_form" action=""
onsubmit="postForm('/up.php','upload_form',1); return false;"
method="POST">
<input type="hidden" name="APC_UPLOAD_PROGRESS" id="progress_key"
value="<?php echo uniqid()?>"/>
<input type="file" name="file1"/><br/>
<input type="file" name="file2"/><br/>
<input type="text" name="desc"/><br/>
<input type="submit" value="Upload!"/>
</form>
<div id="result"></div>
</body>
</html>
Output
Ok, so we can upload via a backend request, but how do we check the status?
More backend requests of course!
Server-side Piece
<?php
if($_SERVER['REQUEST_METHOD']=='POST') {
$status = apc_fetch('upload_'.$_POST['APC_UPLOAD_PROGRESS']);
$status['msg'] = 'blah';
echo json_encode($status);
exit;
} else if(isset($_GET['progress_key'])) {
$status = apc_fetch('upload_'.$_GET['progress_key']);
echo json_encode($status);
}
?>
Client-side
<script>
var fP = function callBack(o) {
var resp = eval('(' + o.responseText + ')');
if(!resp['done']) {
if(resp['total']) {
var pct = parseInt(100*(resp['current']/resp['total']));
document.getElementById('pbar').style.width = ''+pct+'%';
document.getElementById('ppct').innerHTML = " "+pct+"%";
document.getElementById('ptxt').innerHTML = resp['current']+" of "+resp['total']+" bytes";
}
setTimeout("update_progress()",500);
} else if(resp['cancel_upload']) {
txt="Cancelled after "+resp['current']+" bytes!";
document.getElementById('ptxt').innerHTML = txt;
setTimeout("progress_win.hide();window.location.reload(true);",2000);
}
}
var pcallback = { success:fP }
function update_progress() {
progress_key = document.getElementById('progress_key').value;
YAHOO.util.Connect.asyncRequest('GET','up.php?progress_key='+progress_key, pcallback);
}
var progress_win;
function postForm(target,formName) {
YAHOO.util.Connect.setForm(formName,true);
YAHOO.util.Connect.asyncRequest('POST',target,callback);
progress_win = new YAHOO.widget.Panel(...);
update_progress();
}
</script>
<div id="progress_win">
<div class="hd"></div>
<div class="bd"></div>
<div class="ft"></div>
</div>