I'd like to create a progress bar for uploading files using jquery and ajax. so i wrote following jquery code.
function updateProgress(evt)
{
// evt is an ProgressEvent.
if (evt.lengthComputable)
{
var percentLoaded = Math.round((evt.loaded / evt.total) * 100);
// Increase the progress bar length.
$(".progress > div").css(
{
width: percentLoaded + '%'
});
}
}
$.ajax(
{
url: 'assets/php/upload.php?action=uploadFiles',
type: 'POST',
data: newFormData,
cache: false,
xhr: function ()
{
myXhr = $.ajaxSettings.xhr();
if (myXhr.upload)
{
myXhr.upload.addEventListener('progress', updateProgress, false);
}
return myXhr;
},
contentType: false,
processData: false,
});
But the problem is the progress bar will be 100% in a second while uploading file has not finished yet. what is wrong with my code?
Thank you,
Alireza
Maybe it's something related with your style... don't know since I can't see all your code. Try with the following. It's working, but imperceptible with small files. You can use a breakpoint or upload a really huge file to be able to see it. source: http://www.html5rocks.com/en/tutorials/file/dndfiles/
<style>
#progress_bar {
margin: 10px 0;
padding: 3px;
border: 1px solid #000;
font-size: 14px;
clear: both;
opacity: 1.0;
-moz-transition: opacity 1s linear;
-o-transition: opacity 1s linear;
-webkit-transition: opacity 1s linear;
}
#progress_bar.loading {
opacity: 1.0;
}
#progress_bar .percent {
background-color: #99ccff;
height: auto;
width: 0;
}
</style>
<input type="file" id="files" name="file" />
<button onclick="abortRead();">Cancel read</button>
<div id="progress_bar"><div class="percent">0%</div></div>
<script>
var reader;
var progress = document.querySelector('.percent');
function abortRead() {
reader.abort();
}
function errorHandler(evt) {
switch(evt.target.error.code) {
case evt.target.error.NOT_FOUND_ERR:
alert('File Not Found!');
break;
case evt.target.error.NOT_READABLE_ERR:
alert('File is not readable');
break;
case evt.target.error.ABORT_ERR:
break; // noop
default:
alert('An error occurred reading this file.');
};
}
function updateProgress(evt) {
// evt is an ProgressEvent.
if (evt.lengthComputable) {
var percentLoaded = Math.round((evt.loaded / evt.total) * 100);
// Increase the progress bar length.
if (percentLoaded < 100) {
progress.style.width = percentLoaded + '%';
progress.textContent = percentLoaded + '%';
}
}
}
function handleFileSelect(evt) {
// Reset progress indicator on new file selection.
progress.style.width = '0%';
progress.textContent = '0%';
reader = new FileReader();
reader.onerror = errorHandler;
reader.onprogress = updateProgress;
reader.onabort = function(e) {
alert('File read cancelled');
};
reader.onloadstart = function(e) {
document.getElementById('progress_bar').className = 'loading';
};
reader.onload = function(e) {
// Ensure that the progress bar displays 100% at the end.
progress.style.width = '100%';
progress.textContent = '100%';
setTimeout("document.getElementById('progress_bar').className='';", 2000);
}
// Read in the image file as a binary string.
reader.readAsBinaryString(evt.target.files[0]);
}
document.getElementById('files').addEventListener('change', handleFileSelect, false);
</script>
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.