我想要一個基於服務器端請求狀態更新的jQuery進度條。我基於this tutorial的代碼,但它使用文件上傳器作爲其基礎(與this問題相同)。如果沒有文件上傳器,我無法讓它工作。問題是進度條只會在process.php完成後纔會更新。它不是異步地要求更新進展,而是等待整個過程的完成。我只看到數據:數據警報一次。jquery progressbar - 一次加載全部
任何想法?
網頁:
<form id="upload-form" action='process.php' method="post" target="upload-frame">
<input type="hidden" id="uid" name="UPLOAD_IDENTIFIER" value="<?php echo $uid; ?>" >
<input type="submit" value="Submit" />
</form>
<div id="progressbar"></div>
<iframe id="upload-frame" name="upload-frame" style="display:none"></iframe>
Process.php - 由AJAX請求調用 - 當表單提交
<?php
session_start();
$varArray=array(1,2,3,4);
$_SESSION['total']=count($varArray);
foreach($varArray as $val){
$_SESSION['current']=$val;
sleep(2);
}
?>
的javascript
$(document).ready(function() {
var started = false;// This flag determines if the upload has started
$(function() {
// Start progress tracking when the form is submitted
$('#upload-form').submit(function() {
$('#progressbar').progressbar();// Initialize the jQuery UI plugin
// We know the upload is complete when the frame loads
$('#upload-frame').load(function() {
// This is to prevent infinite loop
// in case the upload is too fast
started = true;
// Do whatever you want when upload is complete
alert('Upload Complete!');
});
// Start updating progress after a 1 second delay
setTimeout(function() {
// We pass the upload identifier to our function
updateProgress($('#uid').val());
}, 1000);
});
});
function updateProgress(id) {
var time = new Date().getTime();
// Make a GET request to the server
// Pass our upload identifier as a parameter
// Also pass current time to prevent caching
$.ajax({
url: 'getProgress.php',
type: "GET",
cache: false,
data: {'uid':id},
dataType: 'text',
success: function(data){
alert("data: " + data);
var progress = parseInt(data, 10);
if (progress < 100 || !started) {
// Determine if upload has started
started = progress < 100;
// If we aren't done or started, update again
updateProgress(id);
}
// Update the progress bar percentage
// But only if we have started
started && $('#progressbar').progressbar('value', progress);
}
});
}
}(jQuery));
getProgress.php稱爲:
<?php
session_start();
if (isset($_REQUEST['uid'])) {
if (isset($_SESSION['total']) && isset($_SESSION['current'])) {
// Fetch the upload progress data
$total = $_SESSION['total'];
$current = $_SESSION['current'];
// Calculate the current percentage
$percent_done = round($current/$total*100);
echo $percent_done;
}else{
echo 100;// If there is no data, assume it's done
}
}
?>
真棒。我在process.php中的兩個會話變量定義周圍包裝了'session_start()'和'session_write_close()',它以我期望的方式工作。美麗! – Andrea