| Re: Upload not working on adding progress bar script in HTML file [message #184845 is a reply to message #184833] |
Tue, 11 February 2014 13:26   |
Jerry Stuckle
Messages: 2598
Registered: September 2010
Karma:
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Senior Member |
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On 2/11/2014 12:23 AM, Michael Vilain wrote:
> In article <5d8ba92b-6d39-4d51-ad90-eef3bbfdf8f7(at)googlegroups(dot)com>,
> Saikat Saha <saikat(dot)saha5(at)gmail(dot)com> wrote:
>
>> I am creating an app where I need to upload file using HTML input type="file"
>> to a PHP server,when I upload the file to the PHP link without progress bar
>> its working fine but when i add progress bar count script using ajaxform its
>> unable to upload the file to the PHP server while this progress bar code
>> works fine for this online test server, http://posttestserver.com/post.php.
>>
>> I am not getting what is the actual issue as I am not aware of PHP code and
>> my friend is not aware of HTML code,my friend is saying there is nothing to
>> do from his end as it is working fine without progress bar script. I had
>> tried all possible progress bar script available in the web.please help me
>> out how to solve it with progress bar count.
>
> In order to actually track the progress of the download, you're going to
> have to do all the heavy lifting that the browser and server is doing
> for you. Most likely this would be a java applet that you'd have to
> write. If you think about it, the server has to has no knowledge of the
> byte stream being sent to it by the browser. It's my understanding that
> if you send the actual length of the file to be transferred down to the
> browser, it can display a progress bar.
>
> The reverse is not true. If you use the <input> tag, there's no
> provision to tell the server in the tag how long the transfer would be.
> And once it starts sending the file, the server can't communicate with
> the browser until it's complete.
>
No, before the file upload starts, the browser sends the file size to
the server. And they CAN communicate; see the APC PECL extension.
> If this is a *must have*, I'd look at other tools besides php to
> transfer a file with a progress bar. You'll most likely have to code it
> by hand.
>
It can easily be done with the APC extension and some javascript.
> A quick and dirty workaround is to unhide an animated GIF of clock hands
> or rotating dots or whatever but it won't have any correlation to what's
> being transferred. But it will give the user feedback that something is
> happening.
>
--
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Jerry Stuckle
jstucklex(at)attglobal(dot)net
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