I am still trying to wrap my head around it.
I can have the user select the file (or even multiple) with the file input:
<form>
<div>
<label>Select file to upload</label>
<input type="file">
</div>
<button type="submit">Convert</button>
</form>
And I can catch the submit event using <fill in your event handler here>. But once I do, how do I send the file using fetch?
fetch('/files', {
method: 'post',
// what goes here? What is the "body" for this? content-type header?
}).then(/* whatever */);
I've done it like this:
var input = document.querySelector('input[type="file"]')
var data = new FormData()
data.append('file', input.files[0])
data.append('user', 'hubot')
fetch('/avatars', {
method: 'POST',
body: data
})
This is a basic example with comments. The upload function is what you are looking for:
// Select your input type file and store it in a variable
const input = document.getElementById('fileinput');
// This will upload the file after having read it
const upload = (file) => {
fetch('http://www.example.net', { // Your POST endpoint
method: 'POST',
headers: {
// Content-Type may need to be completely **omitted**
// or you may need something
"Content-Type": "You will perhaps need to define a content-type here"
},
body: file // This is your file object
}).then(
response => response.json() // if the response is a JSON object
).then(
success => console.log(success) // Handle the success response object
).catch(
error => console.log(error) // Handle the error response object
);
};
// Event handler executed when a file is selected
const onSelectFile = () => upload(input.files[0]);
// Add a listener on your input
// It will be triggered when a file will be selected
input.addEventListener('change', onSelectFile, false);
An important note for sending Files with Fetch API
One needs to omit content-type header for the Fetch request. Then the browser will automatically add the Content type header including the Form Boundary which looks like
Content-Type: multipart/form-data; boundary=—-WebKitFormBoundaryfgtsKTYLsT7PNUVD
Form boundary is the delimiter for the form data
If you want multiple files, you can use this
var input = document.querySelector('input[type="file"]')
var data = new FormData()
for (const file of input.files) {
data.append('files',file,file.name)
}
fetch('/avatars', {
method: 'POST',
body: data
})
To submit a single file, you can simply use the File object from the input's .files array directly as the value of body: in your fetch() initializer:
const myInput = document.getElementById('my-input');
// Later, perhaps in a form 'submit' handler or the input's 'change' handler:
fetch('https://example.com/some_endpoint', {
method: 'POST',
body: myInput.files[0],
});
This works because File inherits from Blob, and Blob is one of the permissible BodyInit types defined in the Fetch Standard.
The accepted answer here is a bit dated. As of April 2020, a recommended approach seen on the MDN website suggests using FormData and also does not ask to set the content type. https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch
I'm quoting the code snippet for convenience:
const formData = new FormData();
const fileField = document.querySelector('input[type="file"]');
formData.append('username', 'abc123');
formData.append('avatar', fileField.files[0]);
fetch('https://example.com/profile/avatar', {
method: 'PUT',
body: formData
})
.then((response) => response.json())
.then((result) => {
console.log('Success:', result);
})
.catch((error) => {
console.error('Error:', error);
});
It would be nice to add php endpoint example.
So that is js:
const uploadinput = document.querySelector('#uploadinputid');
const uploadBtn = document.querySelector('#uploadBtnid');
uploadBtn.addEventListener('click',uploadFile);
async function uploadFile(){
const formData = new FormData();
formData.append('nameusedinFormData',uploadinput.files[0]);
try{
const response = await fetch('server.php',{
method:'POST',
body:formData
} );
const result = await response.json();
console.log(result);
}catch(e){
console.log(e);
}
}
That is php:
$file = $_FILES['nameusedinFormData'];
$temp = $file['tmp_name'];
$target_file = './targetfilename.jpg';
move_uploaded_file($_FILES["image"]["tmp_name"], $target_file);
Jumping off from Alex Montoya's approach for multiple file input elements
const inputFiles = document.querySelectorAll('input[type="file"]');
const formData = new FormData();
for (const file of inputFiles) {
formData.append(file.name, file.files[0]);
}
fetch(url, {
method: 'POST',
body: formData })
The problem for me was that I was using a response.blob() to populate the form data. Apparently you can't do that at least with react native so I ended up using
data.append('fileData', {
uri : pickerResponse.uri,
type: pickerResponse.type,
name: pickerResponse.fileName
});
Fetch seems to recognize that format and send the file where the uri is pointing.
Here is my code:
html:
const upload = (file) => {
console.log(file);
fetch('http://localhost:8080/files/uploadFile', {
method: 'POST',
// headers: {
// //"Content-Disposition": "attachment; name='file'; filename='xml2.txt'",
// "Content-Type": "multipart/form-data; boundary=BbC04y " //"multipart/mixed;boundary=gc0p4Jq0M2Yt08jU534c0p" // ή // multipart/form-data
// },
body: file // This is your file object
}).then(
response => response.json() // if the response is a JSON object
).then(
success => console.log(success) // Handle the success response object
).catch(
error => console.log(error) // Handle the error response object
);
//cvForm.submit();
};
const onSelectFile = () => upload(uploadCvInput.files[0]);
uploadCvInput.addEventListener('change', onSelectFile, false);
<form id="cv_form" style="display: none;"
enctype="multipart/form-data">
<input id="uploadCV" type="file" name="file"/>
<button type="submit" id="upload_btn">upload</button>
</form>
<ul class="dropdown-menu">
<li class="nav-item"><a class="nav-link" href="#" id="upload">UPLOAD CV</a></li>
<li class="nav-item"><a class="nav-link" href="#" id="download">DOWNLOAD CV</a></li>
</ul>
How to upload a single file on select using HTML5 fetch
<label role="button">
Upload a picture
<input accept="image/*" type="file" hidden />
</label>
const input = document.querySelector(`input[type="file"]`);
function upload() {
fetch(uplaodURL, { method: "PUT", body: input.files[0] });
}
input.addEventListener("change", upload);
Related
I am still trying to wrap my head around it.
I can have the user select the file (or even multiple) with the file input:
<form>
<div>
<label>Select file to upload</label>
<input type="file">
</div>
<button type="submit">Convert</button>
</form>
And I can catch the submit event using <fill in your event handler here>. But once I do, how do I send the file using fetch?
fetch('/files', {
method: 'post',
// what goes here? What is the "body" for this? content-type header?
}).then(/* whatever */);
I've done it like this:
var input = document.querySelector('input[type="file"]')
var data = new FormData()
data.append('file', input.files[0])
data.append('user', 'hubot')
fetch('/avatars', {
method: 'POST',
body: data
})
This is a basic example with comments. The upload function is what you are looking for:
// Select your input type file and store it in a variable
const input = document.getElementById('fileinput');
// This will upload the file after having read it
const upload = (file) => {
fetch('http://www.example.net', { // Your POST endpoint
method: 'POST',
headers: {
// Content-Type may need to be completely **omitted**
// or you may need something
"Content-Type": "You will perhaps need to define a content-type here"
},
body: file // This is your file object
}).then(
response => response.json() // if the response is a JSON object
).then(
success => console.log(success) // Handle the success response object
).catch(
error => console.log(error) // Handle the error response object
);
};
// Event handler executed when a file is selected
const onSelectFile = () => upload(input.files[0]);
// Add a listener on your input
// It will be triggered when a file will be selected
input.addEventListener('change', onSelectFile, false);
An important note for sending Files with Fetch API
One needs to omit content-type header for the Fetch request. Then the browser will automatically add the Content type header including the Form Boundary which looks like
Content-Type: multipart/form-data; boundary=—-WebKitFormBoundaryfgtsKTYLsT7PNUVD
Form boundary is the delimiter for the form data
If you want multiple files, you can use this
var input = document.querySelector('input[type="file"]')
var data = new FormData()
for (const file of input.files) {
data.append('files',file,file.name)
}
fetch('/avatars', {
method: 'POST',
body: data
})
To submit a single file, you can simply use the File object from the input's .files array directly as the value of body: in your fetch() initializer:
const myInput = document.getElementById('my-input');
// Later, perhaps in a form 'submit' handler or the input's 'change' handler:
fetch('https://example.com/some_endpoint', {
method: 'POST',
body: myInput.files[0],
});
This works because File inherits from Blob, and Blob is one of the permissible BodyInit types defined in the Fetch Standard.
The accepted answer here is a bit dated. As of April 2020, a recommended approach seen on the MDN website suggests using FormData and also does not ask to set the content type. https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch
I'm quoting the code snippet for convenience:
const formData = new FormData();
const fileField = document.querySelector('input[type="file"]');
formData.append('username', 'abc123');
formData.append('avatar', fileField.files[0]);
fetch('https://example.com/profile/avatar', {
method: 'PUT',
body: formData
})
.then((response) => response.json())
.then((result) => {
console.log('Success:', result);
})
.catch((error) => {
console.error('Error:', error);
});
It would be nice to add php endpoint example.
So that is js:
const uploadinput = document.querySelector('#uploadinputid');
const uploadBtn = document.querySelector('#uploadBtnid');
uploadBtn.addEventListener('click',uploadFile);
async function uploadFile(){
const formData = new FormData();
formData.append('nameusedinFormData',uploadinput.files[0]);
try{
const response = await fetch('server.php',{
method:'POST',
body:formData
} );
const result = await response.json();
console.log(result);
}catch(e){
console.log(e);
}
}
That is php:
$file = $_FILES['nameusedinFormData'];
$temp = $file['tmp_name'];
$target_file = './targetfilename.jpg';
move_uploaded_file($_FILES["image"]["tmp_name"], $target_file);
Jumping off from Alex Montoya's approach for multiple file input elements
const inputFiles = document.querySelectorAll('input[type="file"]');
const formData = new FormData();
for (const file of inputFiles) {
formData.append(file.name, file.files[0]);
}
fetch(url, {
method: 'POST',
body: formData })
The problem for me was that I was using a response.blob() to populate the form data. Apparently you can't do that at least with react native so I ended up using
data.append('fileData', {
uri : pickerResponse.uri,
type: pickerResponse.type,
name: pickerResponse.fileName
});
Fetch seems to recognize that format and send the file where the uri is pointing.
Here is my code:
html:
const upload = (file) => {
console.log(file);
fetch('http://localhost:8080/files/uploadFile', {
method: 'POST',
// headers: {
// //"Content-Disposition": "attachment; name='file'; filename='xml2.txt'",
// "Content-Type": "multipart/form-data; boundary=BbC04y " //"multipart/mixed;boundary=gc0p4Jq0M2Yt08jU534c0p" // ή // multipart/form-data
// },
body: file // This is your file object
}).then(
response => response.json() // if the response is a JSON object
).then(
success => console.log(success) // Handle the success response object
).catch(
error => console.log(error) // Handle the error response object
);
//cvForm.submit();
};
const onSelectFile = () => upload(uploadCvInput.files[0]);
uploadCvInput.addEventListener('change', onSelectFile, false);
<form id="cv_form" style="display: none;"
enctype="multipart/form-data">
<input id="uploadCV" type="file" name="file"/>
<button type="submit" id="upload_btn">upload</button>
</form>
<ul class="dropdown-menu">
<li class="nav-item"><a class="nav-link" href="#" id="upload">UPLOAD CV</a></li>
<li class="nav-item"><a class="nav-link" href="#" id="download">DOWNLOAD CV</a></li>
</ul>
How to upload a single file on select using HTML5 fetch
<label role="button">
Upload a picture
<input accept="image/*" type="file" hidden />
</label>
const input = document.querySelector(`input[type="file"]`);
function upload() {
fetch(uplaodURL, { method: "PUT", body: input.files[0] });
}
input.addEventListener("change", upload);
I am trying to upload PDF file to S3 Bucket in react js. I have created an API through API gateway to expose put method of S3 objects.
It works fine when I try to upload file with "put" method of fetch whereas axios put uploads the file without body.
Here's my Fetch code:
function handleChange(event) {
setFile(event.target.files[0])
}
const handleClick = (e) => {
e.preventDefault();
const formData = new FormData();
formData.append('file', file);
const filename = file.name;
fetch(`${PutEndPoint}/${filename}`,
{
method:'Put',
headers: {
'Content-Type': 'application/pdf',
},
body :formData
//JSON.stringify({ title: 'Fetch PUT Request Example' })
})
.then(response => response.json())
.then(json => console.log(json))
Axios code:
function handleChange(event) {
setFile(event.target.files[0])
}
const handleClick = (e) => {
e.preventDefault();
const formData = new FormData();
const filename = file.name;
console.log(file.name);
formData.append('file', file);
console.log(formData)
axios(`${PutEndPoint}/${filename}`,
{
method:'Put'
headers: {
'Content-Type': 'application/pdf',
},
formData
})
.then(response => response.json())
.then(json => console.log(json))
HTML:
<input type='file' name="file" onChange={handleChange}></input>
<Button onClick= {handleClick}>
Upload
</Button>
I have tried:
Use content-type as multipart/form-data
Remove content-Type from header
Add file name as third argument to append
formData.append('file', file, file.name);
Change content-type of API to accept multipart/form-data
None of this has worked.
As per docs, the syntax has to look like this:
// Send a PUT request
axios({
method: 'put', // the request method to be used when making the request request
url: '`${PutEndPoint}/${filename}`', // the server URL that will be used for the request,
headers: {'Content-Type': 'application/pdf'}, // custom headers to be sent
data: formData // --> the data to be sent as the request body
});
// data is the data to be sent as the request body
// Only applicable for request methods 'PUT', 'POST', 'DELETE , and 'PATCH'
// When no transformRequest is set, must be of one of the following
types:
// - string, plain object, ArrayBuffer, ArrayBufferView,
URLSearchParams
// - Browser only: FormData, File, Blob
// - Node only: Stream, Buffer
See https://github.com/axios/axios#axios-api
I am still trying to wrap my head around it.
I can have the user select the file (or even multiple) with the file input:
<form>
<div>
<label>Select file to upload</label>
<input type="file">
</div>
<button type="submit">Convert</button>
</form>
And I can catch the submit event using <fill in your event handler here>. But once I do, how do I send the file using fetch?
fetch('/files', {
method: 'post',
// what goes here? What is the "body" for this? content-type header?
}).then(/* whatever */);
I've done it like this:
var input = document.querySelector('input[type="file"]')
var data = new FormData()
data.append('file', input.files[0])
data.append('user', 'hubot')
fetch('/avatars', {
method: 'POST',
body: data
})
This is a basic example with comments. The upload function is what you are looking for:
// Select your input type file and store it in a variable
const input = document.getElementById('fileinput');
// This will upload the file after having read it
const upload = (file) => {
fetch('http://www.example.net', { // Your POST endpoint
method: 'POST',
headers: {
// Content-Type may need to be completely **omitted**
// or you may need something
"Content-Type": "You will perhaps need to define a content-type here"
},
body: file // This is your file object
}).then(
response => response.json() // if the response is a JSON object
).then(
success => console.log(success) // Handle the success response object
).catch(
error => console.log(error) // Handle the error response object
);
};
// Event handler executed when a file is selected
const onSelectFile = () => upload(input.files[0]);
// Add a listener on your input
// It will be triggered when a file will be selected
input.addEventListener('change', onSelectFile, false);
An important note for sending Files with Fetch API
One needs to omit content-type header for the Fetch request. Then the browser will automatically add the Content type header including the Form Boundary which looks like
Content-Type: multipart/form-data; boundary=—-WebKitFormBoundaryfgtsKTYLsT7PNUVD
Form boundary is the delimiter for the form data
If you want multiple files, you can use this
var input = document.querySelector('input[type="file"]')
var data = new FormData()
for (const file of input.files) {
data.append('files',file,file.name)
}
fetch('/avatars', {
method: 'POST',
body: data
})
To submit a single file, you can simply use the File object from the input's .files array directly as the value of body: in your fetch() initializer:
const myInput = document.getElementById('my-input');
// Later, perhaps in a form 'submit' handler or the input's 'change' handler:
fetch('https://example.com/some_endpoint', {
method: 'POST',
body: myInput.files[0],
});
This works because File inherits from Blob, and Blob is one of the permissible BodyInit types defined in the Fetch Standard.
The accepted answer here is a bit dated. As of April 2020, a recommended approach seen on the MDN website suggests using FormData and also does not ask to set the content type. https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch
I'm quoting the code snippet for convenience:
const formData = new FormData();
const fileField = document.querySelector('input[type="file"]');
formData.append('username', 'abc123');
formData.append('avatar', fileField.files[0]);
fetch('https://example.com/profile/avatar', {
method: 'PUT',
body: formData
})
.then((response) => response.json())
.then((result) => {
console.log('Success:', result);
})
.catch((error) => {
console.error('Error:', error);
});
It would be nice to add php endpoint example.
So that is js:
const uploadinput = document.querySelector('#uploadinputid');
const uploadBtn = document.querySelector('#uploadBtnid');
uploadBtn.addEventListener('click',uploadFile);
async function uploadFile(){
const formData = new FormData();
formData.append('nameusedinFormData',uploadinput.files[0]);
try{
const response = await fetch('server.php',{
method:'POST',
body:formData
} );
const result = await response.json();
console.log(result);
}catch(e){
console.log(e);
}
}
That is php:
$file = $_FILES['nameusedinFormData'];
$temp = $file['tmp_name'];
$target_file = './targetfilename.jpg';
move_uploaded_file($_FILES["image"]["tmp_name"], $target_file);
Jumping off from Alex Montoya's approach for multiple file input elements
const inputFiles = document.querySelectorAll('input[type="file"]');
const formData = new FormData();
for (const file of inputFiles) {
formData.append(file.name, file.files[0]);
}
fetch(url, {
method: 'POST',
body: formData })
The problem for me was that I was using a response.blob() to populate the form data. Apparently you can't do that at least with react native so I ended up using
data.append('fileData', {
uri : pickerResponse.uri,
type: pickerResponse.type,
name: pickerResponse.fileName
});
Fetch seems to recognize that format and send the file where the uri is pointing.
Here is my code:
html:
const upload = (file) => {
console.log(file);
fetch('http://localhost:8080/files/uploadFile', {
method: 'POST',
// headers: {
// //"Content-Disposition": "attachment; name='file'; filename='xml2.txt'",
// "Content-Type": "multipart/form-data; boundary=BbC04y " //"multipart/mixed;boundary=gc0p4Jq0M2Yt08jU534c0p" // ή // multipart/form-data
// },
body: file // This is your file object
}).then(
response => response.json() // if the response is a JSON object
).then(
success => console.log(success) // Handle the success response object
).catch(
error => console.log(error) // Handle the error response object
);
//cvForm.submit();
};
const onSelectFile = () => upload(uploadCvInput.files[0]);
uploadCvInput.addEventListener('change', onSelectFile, false);
<form id="cv_form" style="display: none;"
enctype="multipart/form-data">
<input id="uploadCV" type="file" name="file"/>
<button type="submit" id="upload_btn">upload</button>
</form>
<ul class="dropdown-menu">
<li class="nav-item"><a class="nav-link" href="#" id="upload">UPLOAD CV</a></li>
<li class="nav-item"><a class="nav-link" href="#" id="download">DOWNLOAD CV</a></li>
</ul>
How to upload a single file on select using HTML5 fetch
<label role="button">
Upload a picture
<input accept="image/*" type="file" hidden />
</label>
const input = document.querySelector(`input[type="file"]`);
function upload() {
fetch(uplaodURL, { method: "PUT", body: input.files[0] });
}
input.addEventListener("change", upload);
I am still trying to wrap my head around it.
I can have the user select the file (or even multiple) with the file input:
<form>
<div>
<label>Select file to upload</label>
<input type="file">
</div>
<button type="submit">Convert</button>
</form>
And I can catch the submit event using <fill in your event handler here>. But once I do, how do I send the file using fetch?
fetch('/files', {
method: 'post',
// what goes here? What is the "body" for this? content-type header?
}).then(/* whatever */);
I've done it like this:
var input = document.querySelector('input[type="file"]')
var data = new FormData()
data.append('file', input.files[0])
data.append('user', 'hubot')
fetch('/avatars', {
method: 'POST',
body: data
})
This is a basic example with comments. The upload function is what you are looking for:
// Select your input type file and store it in a variable
const input = document.getElementById('fileinput');
// This will upload the file after having read it
const upload = (file) => {
fetch('http://www.example.net', { // Your POST endpoint
method: 'POST',
headers: {
// Content-Type may need to be completely **omitted**
// or you may need something
"Content-Type": "You will perhaps need to define a content-type here"
},
body: file // This is your file object
}).then(
response => response.json() // if the response is a JSON object
).then(
success => console.log(success) // Handle the success response object
).catch(
error => console.log(error) // Handle the error response object
);
};
// Event handler executed when a file is selected
const onSelectFile = () => upload(input.files[0]);
// Add a listener on your input
// It will be triggered when a file will be selected
input.addEventListener('change', onSelectFile, false);
An important note for sending Files with Fetch API
One needs to omit content-type header for the Fetch request. Then the browser will automatically add the Content type header including the Form Boundary which looks like
Content-Type: multipart/form-data; boundary=—-WebKitFormBoundaryfgtsKTYLsT7PNUVD
Form boundary is the delimiter for the form data
If you want multiple files, you can use this
var input = document.querySelector('input[type="file"]')
var data = new FormData()
for (const file of input.files) {
data.append('files',file,file.name)
}
fetch('/avatars', {
method: 'POST',
body: data
})
To submit a single file, you can simply use the File object from the input's .files array directly as the value of body: in your fetch() initializer:
const myInput = document.getElementById('my-input');
// Later, perhaps in a form 'submit' handler or the input's 'change' handler:
fetch('https://example.com/some_endpoint', {
method: 'POST',
body: myInput.files[0],
});
This works because File inherits from Blob, and Blob is one of the permissible BodyInit types defined in the Fetch Standard.
The accepted answer here is a bit dated. As of April 2020, a recommended approach seen on the MDN website suggests using FormData and also does not ask to set the content type. https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch
I'm quoting the code snippet for convenience:
const formData = new FormData();
const fileField = document.querySelector('input[type="file"]');
formData.append('username', 'abc123');
formData.append('avatar', fileField.files[0]);
fetch('https://example.com/profile/avatar', {
method: 'PUT',
body: formData
})
.then((response) => response.json())
.then((result) => {
console.log('Success:', result);
})
.catch((error) => {
console.error('Error:', error);
});
It would be nice to add php endpoint example.
So that is js:
const uploadinput = document.querySelector('#uploadinputid');
const uploadBtn = document.querySelector('#uploadBtnid');
uploadBtn.addEventListener('click',uploadFile);
async function uploadFile(){
const formData = new FormData();
formData.append('nameusedinFormData',uploadinput.files[0]);
try{
const response = await fetch('server.php',{
method:'POST',
body:formData
} );
const result = await response.json();
console.log(result);
}catch(e){
console.log(e);
}
}
That is php:
$file = $_FILES['nameusedinFormData'];
$temp = $file['tmp_name'];
$target_file = './targetfilename.jpg';
move_uploaded_file($_FILES["image"]["tmp_name"], $target_file);
Jumping off from Alex Montoya's approach for multiple file input elements
const inputFiles = document.querySelectorAll('input[type="file"]');
const formData = new FormData();
for (const file of inputFiles) {
formData.append(file.name, file.files[0]);
}
fetch(url, {
method: 'POST',
body: formData })
The problem for me was that I was using a response.blob() to populate the form data. Apparently you can't do that at least with react native so I ended up using
data.append('fileData', {
uri : pickerResponse.uri,
type: pickerResponse.type,
name: pickerResponse.fileName
});
Fetch seems to recognize that format and send the file where the uri is pointing.
Here is my code:
html:
const upload = (file) => {
console.log(file);
fetch('http://localhost:8080/files/uploadFile', {
method: 'POST',
// headers: {
// //"Content-Disposition": "attachment; name='file'; filename='xml2.txt'",
// "Content-Type": "multipart/form-data; boundary=BbC04y " //"multipart/mixed;boundary=gc0p4Jq0M2Yt08jU534c0p" // ή // multipart/form-data
// },
body: file // This is your file object
}).then(
response => response.json() // if the response is a JSON object
).then(
success => console.log(success) // Handle the success response object
).catch(
error => console.log(error) // Handle the error response object
);
//cvForm.submit();
};
const onSelectFile = () => upload(uploadCvInput.files[0]);
uploadCvInput.addEventListener('change', onSelectFile, false);
<form id="cv_form" style="display: none;"
enctype="multipart/form-data">
<input id="uploadCV" type="file" name="file"/>
<button type="submit" id="upload_btn">upload</button>
</form>
<ul class="dropdown-menu">
<li class="nav-item"><a class="nav-link" href="#" id="upload">UPLOAD CV</a></li>
<li class="nav-item"><a class="nav-link" href="#" id="download">DOWNLOAD CV</a></li>
</ul>
How to upload a single file on select using HTML5 fetch
<label role="button">
Upload a picture
<input accept="image/*" type="file" hidden />
</label>
const input = document.querySelector(`input[type="file"]`);
function upload() {
fetch(uplaodURL, { method: "PUT", body: input.files[0] });
}
input.addEventListener("change", upload);
I am still trying to wrap my head around it.
I can have the user select the file (or even multiple) with the file input:
<form>
<div>
<label>Select file to upload</label>
<input type="file">
</div>
<button type="submit">Convert</button>
</form>
And I can catch the submit event using <fill in your event handler here>. But once I do, how do I send the file using fetch?
fetch('/files', {
method: 'post',
// what goes here? What is the "body" for this? content-type header?
}).then(/* whatever */);
I've done it like this:
var input = document.querySelector('input[type="file"]')
var data = new FormData()
data.append('file', input.files[0])
data.append('user', 'hubot')
fetch('/avatars', {
method: 'POST',
body: data
})
This is a basic example with comments. The upload function is what you are looking for:
// Select your input type file and store it in a variable
const input = document.getElementById('fileinput');
// This will upload the file after having read it
const upload = (file) => {
fetch('http://www.example.net', { // Your POST endpoint
method: 'POST',
headers: {
// Content-Type may need to be completely **omitted**
// or you may need something
"Content-Type": "You will perhaps need to define a content-type here"
},
body: file // This is your file object
}).then(
response => response.json() // if the response is a JSON object
).then(
success => console.log(success) // Handle the success response object
).catch(
error => console.log(error) // Handle the error response object
);
};
// Event handler executed when a file is selected
const onSelectFile = () => upload(input.files[0]);
// Add a listener on your input
// It will be triggered when a file will be selected
input.addEventListener('change', onSelectFile, false);
An important note for sending Files with Fetch API
One needs to omit content-type header for the Fetch request. Then the browser will automatically add the Content type header including the Form Boundary which looks like
Content-Type: multipart/form-data; boundary=—-WebKitFormBoundaryfgtsKTYLsT7PNUVD
Form boundary is the delimiter for the form data
If you want multiple files, you can use this
var input = document.querySelector('input[type="file"]')
var data = new FormData()
for (const file of input.files) {
data.append('files',file,file.name)
}
fetch('/avatars', {
method: 'POST',
body: data
})
To submit a single file, you can simply use the File object from the input's .files array directly as the value of body: in your fetch() initializer:
const myInput = document.getElementById('my-input');
// Later, perhaps in a form 'submit' handler or the input's 'change' handler:
fetch('https://example.com/some_endpoint', {
method: 'POST',
body: myInput.files[0],
});
This works because File inherits from Blob, and Blob is one of the permissible BodyInit types defined in the Fetch Standard.
The accepted answer here is a bit dated. As of April 2020, a recommended approach seen on the MDN website suggests using FormData and also does not ask to set the content type. https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch
I'm quoting the code snippet for convenience:
const formData = new FormData();
const fileField = document.querySelector('input[type="file"]');
formData.append('username', 'abc123');
formData.append('avatar', fileField.files[0]);
fetch('https://example.com/profile/avatar', {
method: 'PUT',
body: formData
})
.then((response) => response.json())
.then((result) => {
console.log('Success:', result);
})
.catch((error) => {
console.error('Error:', error);
});
It would be nice to add php endpoint example.
So that is js:
const uploadinput = document.querySelector('#uploadinputid');
const uploadBtn = document.querySelector('#uploadBtnid');
uploadBtn.addEventListener('click',uploadFile);
async function uploadFile(){
const formData = new FormData();
formData.append('nameusedinFormData',uploadinput.files[0]);
try{
const response = await fetch('server.php',{
method:'POST',
body:formData
} );
const result = await response.json();
console.log(result);
}catch(e){
console.log(e);
}
}
That is php:
$file = $_FILES['nameusedinFormData'];
$temp = $file['tmp_name'];
$target_file = './targetfilename.jpg';
move_uploaded_file($_FILES["image"]["tmp_name"], $target_file);
Jumping off from Alex Montoya's approach for multiple file input elements
const inputFiles = document.querySelectorAll('input[type="file"]');
const formData = new FormData();
for (const file of inputFiles) {
formData.append(file.name, file.files[0]);
}
fetch(url, {
method: 'POST',
body: formData })
The problem for me was that I was using a response.blob() to populate the form data. Apparently you can't do that at least with react native so I ended up using
data.append('fileData', {
uri : pickerResponse.uri,
type: pickerResponse.type,
name: pickerResponse.fileName
});
Fetch seems to recognize that format and send the file where the uri is pointing.
Here is my code:
html:
const upload = (file) => {
console.log(file);
fetch('http://localhost:8080/files/uploadFile', {
method: 'POST',
// headers: {
// //"Content-Disposition": "attachment; name='file'; filename='xml2.txt'",
// "Content-Type": "multipart/form-data; boundary=BbC04y " //"multipart/mixed;boundary=gc0p4Jq0M2Yt08jU534c0p" // ή // multipart/form-data
// },
body: file // This is your file object
}).then(
response => response.json() // if the response is a JSON object
).then(
success => console.log(success) // Handle the success response object
).catch(
error => console.log(error) // Handle the error response object
);
//cvForm.submit();
};
const onSelectFile = () => upload(uploadCvInput.files[0]);
uploadCvInput.addEventListener('change', onSelectFile, false);
<form id="cv_form" style="display: none;"
enctype="multipart/form-data">
<input id="uploadCV" type="file" name="file"/>
<button type="submit" id="upload_btn">upload</button>
</form>
<ul class="dropdown-menu">
<li class="nav-item"><a class="nav-link" href="#" id="upload">UPLOAD CV</a></li>
<li class="nav-item"><a class="nav-link" href="#" id="download">DOWNLOAD CV</a></li>
</ul>
How to upload a single file on select using HTML5 fetch
<label role="button">
Upload a picture
<input accept="image/*" type="file" hidden />
</label>
const input = document.querySelector(`input[type="file"]`);
function upload() {
fetch(uplaodURL, { method: "PUT", body: input.files[0] });
}
input.addEventListener("change", upload);