So im trying to upload an image to a canvas background, i have that working with an upload tag but when you use this on mobile it turns the photo on the side.
HTML
<input class="button" type='file' id='getval' name="background-image" />
has anybody ever come accross this before and if so please help.
JAVASCRIPT
document.getElementById('getval').addEventListener('change', readURL, true);
function readURL() {
var file = document.getElementById("getval").files[0];
var reader = new FileReader();
reader.onloadend = function() {
document.getElementById('paint').style.backgroundImage = "url(" + reader.result + ")";
};
if(file) {
reader.readAsDataURL(file);
} else {}
}
Related
Using a JS snippet I found here I am able to preview images prior to upload, here is that code...
function previewImages() {
var preview = document.querySelector('#preview');
if (this.files) {
[].forEach.call(this.files, readAndPreview);
}
function readAndPreview(file) {
// Make sure `file.name` matches our extensions criteria
if (!/\.(jpe?g|png|gif)$/i.test(file.name)) {
return alert(file.name + " is not an image");
} // else...
var reader = new FileReader();
reader.addEventListener("load", function() {
var image = new Image();
image.height = 85;
image.title = file.name;
image.src = this.result;
preview.appendChild(image);
});
reader.readAsDataURL(file);
}
}
document.querySelector('#file-input').addEventListener("change", previewImages);
<input id="file-input" type="file" multiple>
<div id="preview"></div>
My issue is despite the filenames of the images being uploaded being like 1-black, 2-red, 3-blue etc when they are previewed they are in a random order, the desired output would be to show them in alphabetical order.
I have been looking at images.sort(); // use sort function of javascript. but can't figure out how to use it!
I've been trying to add a .mp3 file being loaded by Input on a URL, so i can play it using my player, but i cant load it as URL
I tried using FileReader with readAsDataURL, but i dont get URL for the file
I have this input
<input id="auInput" type="file" accept="audio/*" onChange={e => readURL(e)}/>
and the reader function:
function readURL(input) {
if(input.target.files && input.target.files[0]){
let reader = new FileReader();
reader.onloadend = function(e){
let audio = new Audio(e.target.result);
};
reader.readAsDataURL(input.target.files[0]);
// This is where i need the URL to add it to player:
sourceAux = reader.result;
}
I expect a URL and im just getting an empty string
I've found an answer, by using this
function readURL(input){
sourceAux = URL.createObjectURL(input.target.fles[0]);
console.log(sourceAux);
let audio = new Audio(sourceAux);
}
I'm implementing a check in which I dont want to upload the image which has size greater than 4MB. I'm using file reader and new image(). I've the image size and width. But how can I get the filesize.
function previewImage(element) {
var reader = new FileReader();
reader.onload = function (event) {
seAddArtist.imageSource = event.target.result;
$scope.$apply();
};
// when the file is read it triggers the onload event above.
reader.readAsDataURL(element.files[0]);
}
var img = new Image();
img.onload = function () {
alert(this.width + 'x' + this.height);
}
I am implementing these two combine but how can i check the size of image?
FileReader (FileReader API) itself does not provide the size of an file. You need to use file (file API) instead:
function previewImage(element) {
var reader = new FileReader();
reader.onload = function(event) {
seAddArtist.imageSource = event.target.result;
$scope.$apply();
};
// when the file is read it triggers the onload event above.
reader.readAsDataURL(element.files[0]);
//log / access file size in bytes
console.log(element.files[0].size + ' Bytes');
//log / access file size in Mb
console.log(element.files[0].size/1024/1024 + ' MB');
if (element.files[0].size/1024/1024 > 4) {
console.log('file is bigger than 4MB);
}
}
That might be what you want:
var size = files[0].size;
You can check the file size before submitting:
<!doctype HTML>
<html>
<head>
<script>
function checkFileSize() {
var size = document.getElementById("fileSelector").files[0].size;
alert("file size: " + size);
}
</script>
</head>
<body>
<input id="fileSelector" type="file" onchange="checkFileSize()"/>
<input type="submit" />
</body>
</html>
This is working code to get file size. you will get file size in KB.
<input id="file" type="file">
<img id="filerendered" src="">
and in script tag
document.getElementById('file').onchange = function (event) {
var targetn = event.target || window.event.srcElement,
files = targetn.files;
// FileReader here
if (FileReader && files && files.length) {
var thisReader = new FileReader();
alert("your file size "+ (files[0].size)/1024 + "kb")
thisReader.onload = function () {
document.getElementById("filerendered").src = thisReader.result;
}
thisReader.readAsDataURL(files[0]);
}
// for Not supported case
else {
// not supported
}
}
I want to read a local binary file. So, I do this
var file = new File([""], url);
var reader = new FileReader();
reader.onload = function () {
parse(reader.result);
}
reader.readAsArrayBuffer(file);
where url is a filepath like url="c:\temp\myfile.bin"
I don't have any errors, but something is wrong, because all data from my app disappear. What could be wrong ? Any ideas ?
Thanks!
I guess you have to use input type="file" for security reasons.
Here's a working example. For convenience it shows the opened file in the same browser window.
<html>
<body>
<script>
function readFile() {
var reader = new FileReader();
file = document.getElementById("uploadText").files[0];
reader.onload = function (ev) {
document.getElementById("obj").data = ev.target.result;
// parse(ev.target.result);
};
reader.readAsDataURL(file);
// reader.readAsArrayBuffer(file);
};
</script>
<div>
<input id="uploadText" type="file" onchange="readFile();" />
</div>
<object id="obj" data="" />
</body>
</html>
I'm trying to get image as Object of javascript on the client side to send it using jQuery
<html>
<body>
<script language="JavaScript">
function checkSize()
{
im = new Image();
im.src = document.Upload.submitfile.value;
if(!im.src)
im.src = document.getElementById('submitfile').value;
alert(im.src);
alert(im.width);
alert(im.height);
alert(im.fileSize);
}
</script>
<form name="Upload" action="#" enctype="multipart/form-data" method="post">
<p>Filename: <input type="file" name="submitfile" id="submitfile" />
<input type="button" value="Send" onClick="checkSize();" />
</form>
</body>
</html>
But in this code only alert(im.src) is displaying src of file but alert(im.width),alert(im.height),alert(im.filesize) are not working properly and alerting 0, 0, undefined respectively. Kindly tell me how I can access image object using javascript?
The reason that im.fileSize is only working in IE is because ".fileSize" is only an IE property. Since you have code that works in IE, I would do a check for the browser and render your current code for IE and try something like this for other browsers.
var imgFile = document.getElementById('submitfile');
if (imgFile.files && imgFile.files[0]) {
var width;
var height;
var fileSize;
var reader = new FileReader();
reader.onload = function(event) {
var dataUri = event.target.result,
img = document.createElement("img");
img.src = dataUri;
width = img.width;
height = img.height;
fileSize = imgFile.files[0].size;
alert(width);
alert(height);
alert(fileSize);
};
reader.onerror = function(event) {
console.error("File could not be read! Code " + event.target.error.code);
};
reader.readAsDataURL(imgFile.files[0]);
}
I haven't tested this code but it should work as long as I don't have some typo. For a better understanding of what I am doing here check out this link.
This is what I use and it works great for me. I save the image as a blob in mysql. When clicked, the file upload dialog appears, that is why i set the file input visibility to hidden and set its type to upload image files. Once the image is selected, it replaces the existing one, then I use the jquery post method to update the image in the database.
<div>
<div><img id="logo" class="img-polaroid" alt="Logo" src="' . $row['logo'] . '" title="Click to change the logo" width="128">
<input style="visibility:hidden;" id="logoupload" type="file" accept="image/* ">
</div>
$('img#logo').click(function(){
$('#logoupload').trigger('click');
$('#logoupload').change(function(e){
var reader = new FileReader(),
files = e.dataTransfer ? e.dataTransfer.files : e.target.files,
i = 0;
reader.onload = onFileLoad;
while (files[i]) reader.readAsDataURL(files[i++]);
});
function onFileLoad(e) {
var data = e.target.result;
$('img#logo').attr("src",data);
//Upload the image to the database
//Save data on keydown
$.post('test.php',{data:$('img#logo').attr("src")},function(){
});
}
});
$('#imagess').change(function(){
var total_images=$('#total_images').val();
var candidateimage=document.getElementById('imagess').value;
formdata = false;
var demo=document.getElementById("imagess").files;
if (window.FormData) {
formdata = new FormData();
}
var i = 0, len = demo.length, img, reader, file;
for ( ; i < len; i++ ) {
file = demo[i];
if (file.type.match(/image.*/)) {
if (formdata) {
formdata.append("images", file);
}
}
}
$('#preview').html('Uploading...');
var url=SITEURL+"users/image_upload/"+total_images;
$.ajax({
url: url,
type: "POST",
data: formdata,
processData: false,
contentType: false,
success: function (res) {
$('#preview').html('');
if (res == "maxlimit") {
alert("You can't upload more than 4 images");
}
else if (res == "error") {
alert("Image can't upload please try again.")
}
else {
$('#user_images').append(res);
}
}
});
});