FileReader error parameter 1 is not of type 'Blob'
I've got a problem with a javascript Filereader which returns the error Uncaught TypeError: Failed to execute 'readAsDataURL' on 'FileReader': parameter 1 is not of type 'Blob'. one in two. Sometimes it works, but when i repeat the operation, it fails.
HTML CODE:
<div className="draggable-container">
<input
type="file"
id="file-browser-input"
name="file-browser-input"
ref={input => this.fileInput = input}
onDragOver={(e) => {
e.preventDefault();
e.stopPropagation();
}}
onDrop={this
.onFileLoad
.bind(this)}
onChange={this
.onFileLoad
.bind(this)}/>
JavaScript Code:
onFileLoad(e){
const file = e.target.files[0];
let fileReader = new FileReader()
fileReader.onload = () =>{
console.log('IMAGE LOADED : ', fileReader.result)
const files = {
name: file.name,
size: file.size,
type: file.type,
data: fileReader.result,
isUploading: false
}
this.addLoadedFile(files);
}
fileReader.onabort = () =>{
alert('reading aborted');
}
fileReader.onerror = () =>{
alert('reading ERROR');
}
-> Error -> fileReader.readAsDataURL(e.target.files[0]);
}
javascript node.js reactjs
asked Nov 23 '18 at 18:14
MrEmiiMrEmii
61
add a comment |
I've got a problem with a javascript Filereader which returns the error Uncaught TypeError: Failed to execute 'readAsDataURL' on 'FileReader': parameter 1 is not of type 'Blob'. one in two. Sometimes it works, but when i repeat the operation, it fails.
HTML CODE:
<div className="draggable-container">
<input
type="file"
id="file-browser-input"
name="file-browser-input"
ref={input => this.fileInput = input}
onDragOver={(e) => {
e.preventDefault();
e.stopPropagation();
}}
onDrop={this
.onFileLoad
.bind(this)}
onChange={this
.onFileLoad
.bind(this)}/>
JavaScript Code:
onFileLoad(e){
const file = e.target.files[0];
let fileReader = new FileReader()
fileReader.onload = () =>{
console.log('IMAGE LOADED : ', fileReader.result)
const files = {
name: file.name,
size: file.size,
type: file.type,
data: fileReader.result,
isUploading: false
}
this.addLoadedFile(files);
}
fileReader.onabort = () =>{
alert('reading aborted');
}
fileReader.onerror = () =>{
alert('reading ERROR');
}
-> Error -> fileReader.readAsDataURL(e.target.files[0]);
}
javascript node.js reactjs
asked Nov 23 '18 at 18:14
MrEmiiMrEmii
61
Well, you can avoid the error by simply checking ife.target.filesis defined.if (e.target.files && e.target.files[0]) {fileReader.readAsDataURL(e.target.files[0]);}
– JM-AGMS
Nov 23 '18 at 21:51
add a comment |
I've got a problem with a javascript Filereader which returns the error Uncaught TypeError: Failed to execute 'readAsDataURL' on 'FileReader': parameter 1 is not of type 'Blob'. one in two. Sometimes it works, but when i repeat the operation, it fails.
HTML CODE:
<div className="draggable-container">
<input
type="file"
id="file-browser-input"
name="file-browser-input"
ref={input => this.fileInput = input}
onDragOver={(e) => {
e.preventDefault();
e.stopPropagation();
}}
onDrop={this
.onFileLoad
.bind(this)}
onChange={this
.onFileLoad
.bind(this)}/>
JavaScript Code:
onFileLoad(e){
const file = e.target.files[0];
let fileReader = new FileReader()
fileReader.onload = () =>{
console.log('IMAGE LOADED : ', fileReader.result)
const files = {
name: file.name,
size: file.size,
type: file.type,
data: fileReader.result,
isUploading: false
}
this.addLoadedFile(files);
}
fileReader.onabort = () =>{
alert('reading aborted');
}
fileReader.onerror = () =>{
alert('reading ERROR');
}
-> Error -> fileReader.readAsDataURL(e.target.files[0]);
}
javascript node.js reactjs
asked Nov 23 '18 at 18:14
MrEmiiMrEmii
61
I've got a problem with a javascript Filereader which returns the error Uncaught TypeError: Failed to execute 'readAsDataURL' on 'FileReader': parameter 1 is not of type 'Blob'. one in two. Sometimes it works, but when i repeat the operation, it fails.
HTML CODE:
<div className="draggable-container">
<input
type="file"
id="file-browser-input"
name="file-browser-input"
ref={input => this.fileInput = input}
onDragOver={(e) => {
e.preventDefault();
e.stopPropagation();
}}
onDrop={this
.onFileLoad
.bind(this)}
onChange={this
.onFileLoad
.bind(this)}/>
JavaScript Code:
onFileLoad(e){
const file = e.target.files[0];
let fileReader = new FileReader()
fileReader.onload = () =>{
console.log('IMAGE LOADED : ', fileReader.result)
const files = {
name: file.name,
size: file.size,
type: file.type,
data: fileReader.result,
isUploading: false
}
this.addLoadedFile(files);
}
fileReader.onabort = () =>{
alert('reading aborted');
}
fileReader.onerror = () =>{
alert('reading ERROR');
}
-> Error -> fileReader.readAsDataURL(e.target.files[0]);
}
javascript node.js reactjs
javascript node.js reactjs
asked Nov 23 '18 at 18:14
MrEmiiMrEmii
61
asked Nov 23 '18 at 18:14
MrEmiiMrEmii
61
asked Nov 23 '18 at 18:14
MrEmiiMrEmii
61
asked Nov 23 '18 at 18:14
MrEmiiMrEmii
61
asked Nov 23 '18 at 18:14
MrEmiiMrEmii
61
61
Well, you can avoid the error by simply checking ife.target.filesis defined.if (e.target.files && e.target.files[0]) {fileReader.readAsDataURL(e.target.files[0]);}
– JM-AGMS
Nov 23 '18 at 21:51
add a comment |
Well, you can avoid the error by simply checking ife.target.filesis defined.if (e.target.files && e.target.files[0]) {fileReader.readAsDataURL(e.target.files[0]);}
– JM-AGMS
Nov 23 '18 at 21:51
Well, you can avoid the error by simply checking if
e.target.files is defined. if (e.target.files && e.target.files[0]) {fileReader.readAsDataURL(e.target.files[0]);}– JM-AGMS
Nov 23 '18 at 21:51
Well, you can avoid the error by simply checking if
e.target.files is defined. if (e.target.files && e.target.files[0]) {fileReader.readAsDataURL(e.target.files[0]);}– JM-AGMS
Nov 23 '18 at 21:51
add a comment |
1 Answer
1
active
oldest
votes
The drop event contains the files in the DataTransfer object. So, instead of
const file = e.target.files[0]
you'll need to do:
const file = e.target.files[0] || e.dataTransfer.files[0]
to handle both events.
That's probably why some of attempts worked, and some didn't - you've just uploaded the file by 2 different ways and only one was working.
answered Nov 23 '18 at 21:55
Vladislav LogvinenkoVladislav Logvinenko
565
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53451330%2ffilereader-error-parameter-1-is-not-of-type-blob%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
The drop event contains the files in the DataTransfer object. So, instead of
const file = e.target.files[0]
you'll need to do:
const file = e.target.files[0] || e.dataTransfer.files[0]
to handle both events.
That's probably why some of attempts worked, and some didn't - you've just uploaded the file by 2 different ways and only one was working.
answered Nov 23 '18 at 21:55
Vladislav LogvinenkoVladislav Logvinenko
565
add a comment |
The drop event contains the files in the DataTransfer object. So, instead of
const file = e.target.files[0]
you'll need to do:
const file = e.target.files[0] || e.dataTransfer.files[0]
to handle both events.
That's probably why some of attempts worked, and some didn't - you've just uploaded the file by 2 different ways and only one was working.
answered Nov 23 '18 at 21:55
Vladislav LogvinenkoVladislav Logvinenko
565
add a comment |
The drop event contains the files in the DataTransfer object. So, instead of
const file = e.target.files[0]
you'll need to do:
const file = e.target.files[0] || e.dataTransfer.files[0]
to handle both events.
That's probably why some of attempts worked, and some didn't - you've just uploaded the file by 2 different ways and only one was working.
answered Nov 23 '18 at 21:55
Vladislav LogvinenkoVladislav Logvinenko
565
The drop event contains the files in the DataTransfer object. So, instead of
const file = e.target.files[0]
you'll need to do:
const file = e.target.files[0] || e.dataTransfer.files[0]
to handle both events.
That's probably why some of attempts worked, and some didn't - you've just uploaded the file by 2 different ways and only one was working.
answered Nov 23 '18 at 21:55
Vladislav LogvinenkoVladislav Logvinenko
565
answered Nov 23 '18 at 21:55
Vladislav LogvinenkoVladislav Logvinenko
565
answered Nov 23 '18 at 21:55
Vladislav LogvinenkoVladislav Logvinenko
565
answered Nov 23 '18 at 21:55
Vladislav LogvinenkoVladislav Logvinenko
565
565
add a comment |
add a comment |
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53451330%2ffilereader-error-parameter-1-is-not-of-type-blob%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Well, you can avoid the error by simply checking if
e.target.filesis defined.if (e.target.files && e.target.files[0]) {fileReader.readAsDataURL(e.target.files[0]);}– JM-AGMS
Nov 23 '18 at 21:51