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Ajax file upload
Is it possible to write an ajax request with JQuery that "submits" a form with a file field? I want to do it because in this way i can make the user upload a file without leaving the current page.
How should i write the $.ajax() call? and in particular how should i set into the ajax call the file field?
EDIT: I'd like to use only core JQuery functions, without plugins.
Thanks.
To maintain compatibility with the widest range of browsers this needs to be done through a hidden iframe.
Here is some sample code to demonstrate what I mean:
<iframe name="my_iframe" id="my_iframe" style="display: none;"></iframe>
<form action="/next_step.php" method="post" target="my_iframe" entype="multipart/form-data">
<input type="file" name="file_upload" />
<input type="button" id="upload_btn" value="Upload file" />
<label for="name">Name</label>
<input type="text" name="name" id="name" />
<input type="submit" value="Next step" />
</form>
<script type="text/javascript">
var btn = document.getElementById('upload_btn');
btn.onclick = function(){
var form_elem = document.forms[0];
// direct file uploads through the hidden iframe
form_elem.action = '/test_file.php';
form_elem.target = 'my_iframe';
// submit the form
form_elem.submit();
};
</script>
There are projects out there that make this easier such as Plupload
It's hard. You're much better to use a service that already exists.
I did this recently on a site because I needed the whole form to submit without reloading the page, and uploadify was the best AJAX file uploader I found.
Related
I have multiple file upload boxes in a single HTML form and in each file box there is an associated upload button and a div container. Clicking the upload button should upload the respective file via AJAX (jQuery). I revered various questions and blogs where there is always a one file upload with one submit button. But my question here is how to upload the selected file on a click event on a button without submitting the entire form. Is that possible?
I put a mock HTML code and the corresponding jsfiddle also
<form id='parent-form' action='complete.php'>
<div>
<input type='file' name='img1'/>
<input type='button' value='upload' name='btnimg1' />
</div>
<div>
<input type='file' name='img2'/>
<input type='button' value='upload' name='btnimg2' />
</div>
<div>
<input type='file' name='img3'/>
<input type='button' value='upload' name='btnimg3' />
</div>
<br/>
<input type='submit' value='Complete' />
</form>
http://jsfiddle.net/z1bj4v9t/
Uploading files via AJAX is not support in all browsers, but in modern browsers it is possible. You'll need to attach a listener to the buttons next to the file fields, or you can upload multiple images at once.
Take a look at this answer: https://stackoverflow.com/a/20462576/1997303
Well this is a thing:
<form>
<input type="file" multiple>
</form>
In HTML5 compatible browsers, add the "multiple" property to the <input type="file">. A similar question was asked here.
I believe the fallback option is to actually use a Flash (of all things) plugin to force your input to be able to grab multiple files. At least this was how Facebook and others were doing it a couple years ago when I looked it up.
Edit to address your comment:
I might do something like:
$('[name^="btnimg"]').click(function(){
/* AJAX sexiness here */
return false; // IMPORTANT... keeps the main form from submitting
}
Then when submitting the main form, grab the data passed from AJAX uploads.
For my php file, I need to grab the unique form name.
The php file is executed when a user clicks the submit button. However, there are multiple submit button each with the same id, but they all have unique names. I need the name when they click on the submit button.
you dont want elements in html with the same id - bad practice in general. Your page will likely load normally but an html validator will notice it as an error.
html validator: http://validator.w3.org/
without seeing your code, its difficult to give you a definitive answer. if you have miltuple forms you can use hidden inputs. e.g.
<input type="hidden" name="form_name" />
Otherwise you can use javascript to put data in the form when the button is clicked. example javascript using jquery
html:
<form id="formid" >
<button type="button" id="someid" onclick="submitForm('btn1')" />
<button type="button" id="someid" onclick="submitForm('btn2')" />
<input type="hidden" id="btnsubmitid" value="" />
</form>
js:
function submitForm(btnID){
$("#btnsubmitid").val(btnID);
$("#formid").submit();
}
1 way is to put a hidden input inside of your form.
<input type="hidden" name="formName" value="[name of form]" />
then in your php, you can get it using
$form-name = $_POST['formName'];
pretty sure there are other ways, but this came to mind first.
I want to make a simple site that would let you browse for an mp3 and upload it automatically.
here is my code
<?php
if(isset($_POST['submit'])){
$file = $_FILES['mp3']['name'];
$tmp = $_FILES['mp3']['tmp_name'];
echo "$file";
move_uploaded_file($tmp, "member/mp3/".$file);
echo"Success";
}
?>
<html>
<form enctype="multipart/form-data" method="POST" action="upload.php">
<input type="file" name="mp3" /><br />
<input type="submit" name="submit" value="Upload" />
</form>
</html>
This code here is my original attempt however this still uses a manual form.
How can I make this upload automatically?
Maybe use something like this:
<input type="file" name="mp3" onchange="this.form.submit();" />
Although I don't condone inline event handlers, it's just an example to make sure it works for you. The point is to catch the onchange event of the file input and then submit its form. Instead of using this.form or whatever, you can grab the form by ID (after giving it one) and call submit() on it.
UPDATE:
To keep your existing PHP code working, give your submit button an id attribute (something other than "submit") and try using this:
<input type="file" name="mp3" onchange="document.getElementById('submit_button_id').click();" />
Again, this could be more maintainable/readable if you made it a function call, like:
<input type="file" name="mp3" onchange="submitForm();" />
<input type="submit" name="submit" id="submit_button_id" value="Upload" />
<script type="text/javascript">
function submitForm() {
// However you need to submit the form
document.getElementById("submit_button_id").click(); // Or whatever
}
</script>
If you would rather change the PHP, you can use the original this.form.submit(); (or just use .submit() on the form element in whatever way). In the PHP, what you really care for is to check if $_FILES['mp3'] is set, so it's up to you if you need to check for the submit button's presence. I forget exactly how isset() works, so I don't want to assume and tell you something wrong. You might be able to use other logic, but the real thing you care about is if the file was sent in the submission, even though it might make it "better" if you make sure a button was used to submit it (though not necessary).
Simple, attach a onchange() JS event to it.
<input type="file" name="mp3" onchange="call .submit() on a form"/><br />
This will submit the form when the user chooses a file. It's safer and more efficient to create these handlers in Jquery or a separate JS script. But for this example, it doesn't matter.
For more information, view this question: HTML <input type='file'> File Selection Event
The structure looks like this:
<form>
...
some stuff
...
file select
...
some stuff
...
</form>
I need to send the input data from "file select" while not sending "some stuff" and as far as i've tried I couldn't get a form inside another form so that's not an option.
The way it works is like this: the file select control isn't displayed at first, clicking a button makes it show the control and some other stuff. I need a button to submit that file to be checked for different things (naming, size, etc) and uploaded to the server, without changing or reloading the rest of the window.
I could change the layout a bit and get the file select stuff out of the form but the boss doesn't want to change the design of the window and removing the outer-most form will be a lot of work as it's a very complicated part of the web site.
So, as the question says: Can I do it? Can I get the file trough javascript and send it to another php file for processing?
The most browser compatible way to achieve this is to use a hidden iframe that you submit the form into. For example:
<iframe name="my_iframe" id="my_iframe" style="display: none;"></iframe>
<form action="/next_step.php" method="post" target="my_iframe" entype="multipart/form-data">
<input type="file" name="file_upload" />
<input type="button" id="upload_btn" value="Upload file" />
<label for="name">Name</label>
<input type="text" name="name" id="name" />
<input type="submit" value="Next step" />
</form>
<script type="text/javascript">
var btn = document.getElementById('upload_btn');
btn.onclick = function(){
var form_elem = document.forms[0];
// direct file uploads through the hidden iframe
form_elem.action = '/test_file.php';
form_elem.target = 'my_iframe';
// submit the form
form_elem.submit();
// now reset for next step in the form
form_elem.action = '/next_step.php';
form_elem.target = null;
};
</script>
I try to create an upload progress bar with PHP and jQuery. However, I have a problem when I bring it to the form data. The code is similar like this:
<form method="post" action="upload.php" enctype="multipart/form-data" id="upload-form" target="upload-frame">
Suburb:<input type="text" name="txtSuburb" id="txtSuburb">
Picture:
<input type="hidden" id="uid" name="UPLOAD_IDENTIFIER" value="<?php echo $uid; ?>">
<input type="file" name="file">
<input type="button" name="submit" value="Upload!">
<iframe id="upload-frame" name="upload-frame">
</iframe>
<input type="submit" name="DataSubmit" value="Submit Data"/>
</form>
As you can see, I got 2 submit buttons. If I keep the form like this then the form can't submit data to server. It just submits the file to iFrame. If I change the action and target of the form then the upload progress function will not work.
Could anyone please help me to find the solution for this?
I want the user can click on upload button to upload their file. Then they can take the rest to fill the form. When everything is done, they can click on another submit data button to submit their data (included the file) to the server.
Make sure that you have only one input element of type submit within your form.
If you want the first button to trigger some Javascript, use a regular input element or even a styled link and attach a Javascript event to it's onclick event, then prevent it's default behavior, e.g. by returning false.
Like this only the second button will actually submit your form which should do what you're describing.
In general I'd second #Treffynnon's suggestion to use a existing library for this purpose. These hacks have a tendency to get pretty nasty, especially when it comes to crossbrowser compatibility.