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How to load an image locally and display its contents using HTML [duplicate]

I want to be able to preview a file (image) before it is uploaded. The preview action should be executed all in the browser without using Ajax to upload the image.
How can I do this?

imgInp.onchange = evt => {
const [file] = imgInp.files
if (file) {
blah.src = URL.createObjectURL(file)
}
}
<form runat="server">
<input accept="image/*" type='file' id="imgInp" />
<img id="blah" src="#" alt="your image" />
</form>

There are a couple ways you can do this. The most efficient way would be to use URL.createObjectURL() on the File from your <input>. Pass this URL to img.src to tell the browser to load the provided image.
Here's an example:
<input type="file" accept="image/*" onchange="loadFile(event)">
<img id="output"/>
<script>
var loadFile = function(event) {
var output = document.getElementById('output');
output.src = URL.createObjectURL(event.target.files[0]);
output.onload = function() {
URL.revokeObjectURL(output.src) // free memory
}
};
</script>
You can also use FileReader.readAsDataURL() to parse the file from your <input>. This will create a string in memory containing a base64 representation of the image.
<input type="file" accept="image/*" onchange="loadFile(event)">
<img id="output"/>
<script>
var loadFile = function(event) {
var reader = new FileReader();
reader.onload = function(){
var output = document.getElementById('output');
output.src = reader.result;
};
reader.readAsDataURL(event.target.files[0]);
};
</script>

One-liner solution:
The following code uses object URLs, which is much more efficient than data URL for viewing large images (A data URL is a huge string containing all of the file data, whereas an object URL, is just a short string referencing the file data in-memory):
<img id="blah" alt="your image" width="100" height="100" />
<input type="file"
onchange="document.getElementById('blah').src = window.URL.createObjectURL(this.files[0])">
Generated URL will be like:
blob:http%3A//localhost/7514bc74-65d4-4cf0-a0df-3de016824345

Try This
To PREVIEW the image before uploading it to the SERVER from the Browser without using Ajax or any complicated functions.
It needs an "onChange" event to load the image.
function preview() {
frame.src=URL.createObjectURL(event.target.files[0]);
}
<form>
<input type="file" onchange="preview()">
<img id="frame" src="" width="100px" height="100px"/>
</form>
To preview multiple image click here

The answer of LeassTaTT works well in "standard" browsers like FF and Chrome.
The solution for IE exists but looks different. Here description of cross-browser solution:
In HTML we need two preview elements, img for standard browsers and div for IE
HTML:
<img id="preview"
src=""
alt=""
style="display:none; max-width: 160px; max-height: 120px; border: none;"/>
<div id="preview_ie"></div>
In CSS we specify the following IE specific thing:
CSS:
#preview_ie {
FILTER: progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)
}
In HTML we include the standard and the IE-specific Javascripts:
<script type="text/javascript">
{% include "pic_preview.js" %}
</script>
<!--[if gte IE 7]>
<script type="text/javascript">
{% include "pic_preview_ie.js" %}
</script>
The pic_preview.js is the Javascript from the LeassTaTT's answer. Replace the $('#blah') whith the $('#preview') and add the $('#preview').show()
Now the IE specific Javascript (pic_preview_ie.js):
function readURL (imgFile) {
var newPreview = document.getElementById('preview_ie');
newPreview.filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = imgFile.value;
newPreview.style.width = '160px';
newPreview.style.height = '120px';
}
That's is. Works in IE7, IE8, FF and Chrome. Please test in IE9 and report.
The idea of IE preview was found here:
http://forums.asp.net/t/1320559.aspx
http://msdn.microsoft.com/en-us/library/ms532969(v=vs.85).aspx

Short two-liner
This is size improvement of cmlevy answer - try
<input type=file oninput="pic.src=window.URL.createObjectURL(this.files[0])">
<img id="pic" />

I have edited #Ivan's answer to display "No Preview Available" image, if it is not an image:
function readURL(input) {
var url = input.value;
var ext = url.substring(url.lastIndexOf('.') + 1).toLowerCase();
if (input.files && input.files[0]&& (ext == "gif" || ext == "png" || ext == "jpeg" || ext == "jpg")) {
var reader = new FileReader();
reader.onload = function (e) {
$('.imagepreview').attr('src', e.target.result);
}
reader.readAsDataURL(input.files[0]);
}else{
$('.imagepreview').attr('src', '/assets/no_preview.png');
}
}

Here's a multiple files version, based on Ivan Baev's answer.
The HTML
<input type="file" multiple id="gallery-photo-add">
<div class="gallery"></div>
JavaScript / jQuery
$(function() {
// Multiple images preview in browser
var imagesPreview = function(input, placeToInsertImagePreview) {
if (input.files) {
var filesAmount = input.files.length;
for (i = 0; i < filesAmount; i++) {
var reader = new FileReader();
reader.onload = function(event) {
$($.parseHTML('<img>')).attr('src', event.target.result).appendTo(placeToInsertImagePreview);
}
reader.readAsDataURL(input.files[i]);
}
}
};
$('#gallery-photo-add').on('change', function() {
imagesPreview(this, 'div.gallery');
});
});
Requires jQuery 1.8 due to the usage of $.parseHTML, which should help with XSS mitigation.
This will work out of the box, and the only dependancy you need is jQuery.

Yes. It is possible.
Html
<input type="file" accept="image/*" onchange="showMyImage(this)" />
<br/>
<img id="thumbnil" style="width:20%; margin-top:10px;" src="" alt="image"/>
JS
function showMyImage(fileInput) {
var files = fileInput.files;
for (var i = 0; i < files.length; i++) {
var file = files[i];
var imageType = /image.*/;
if (!file.type.match(imageType)) {
continue;
}
var img=document.getElementById("thumbnil");
img.file = file;
var reader = new FileReader();
reader.onload = (function(aImg) {
return function(e) {
aImg.src = e.target.result;
};
})(img);
reader.readAsDataURL(file);
}
}
You can get Live Demo from here.

Clean and simple
JSfiddle
This will be useful when you want The event to triggered indirectly from a div or a button.
<img id="image-preview" style="height:100px; width:100px;" src="" >
<input style="display:none" id="input-image-hidden" onchange="document.getElementById('image-preview').src = window.URL.createObjectURL(this.files[0])" type="file" accept="image/jpeg, image/png">
<button onclick="HandleBrowseClick('input-image-hidden');" >UPLOAD IMAGE</button>
<script type="text/javascript">
function HandleBrowseClick(hidden_input_image)
{
var fileinputElement = document.getElementById(hidden_input_image);
fileinputElement.click();
}
</script>

TO PREVIEW MULTIPLE FILES using jquery
$(document).ready(function(){
$('#image').change(function(){
$("#frames").html('');
for (var i = 0; i < $(this)[0].files.length; i++) {
$("#frames").append('<img src="'+window.URL.createObjectURL(this.files[i])+'" width="100px" height="100px"/>');
}
});
});
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
</head>
<body>
<input type="file" id="image" name="image[]" multiple /><br/>
<div id="frames"></div>
</body>

Example with multiple images using JavaScript (jQuery) and HTML5
JavaScript (jQuery)
function readURL(input) {
for(var i =0; i< input.files.length; i++){
if (input.files[i]) {
var reader = new FileReader();
reader.onload = function (e) {
var img = $('<img id="dynamic">');
img.attr('src', e.target.result);
img.appendTo('#form1');
}
reader.readAsDataURL(input.files[i]);
}
}
}
$("#imgUpload").change(function(){
readURL(this);
});
}
Markup (HTML)
<form id="form1" runat="server">
<input type="file" id="imgUpload" multiple/>
</form>

In React, if the file is in your props, you can use:
{props.value instanceof File && (
<img src={URL.createObjectURL(props.value)}/>
)}

How about creating a function that loads the file and fires a custom event. Then attach a listener to the input. This way we have more flexibility to use the file, not just for previewing images.
/**
* #param {domElement} input - The input element
* #param {string} typeData - The type of data to be return in the event object.
*/
function loadFileFromInput(input,typeData) {
var reader,
fileLoadedEvent,
files = input.files;
if (files && files[0]) {
reader = new FileReader();
reader.onload = function (e) {
fileLoadedEvent = new CustomEvent('fileLoaded',{
detail:{
data:reader.result,
file:files[0]
},
bubbles:true,
cancelable:true
});
input.dispatchEvent(fileLoadedEvent);
}
switch(typeData) {
case 'arraybuffer':
reader.readAsArrayBuffer(files[0]);
break;
case 'dataurl':
reader.readAsDataURL(files[0]);
break;
case 'binarystring':
reader.readAsBinaryString(files[0]);
break;
case 'text':
reader.readAsText(files[0]);
break;
}
}
}
function fileHandler (e) {
var data = e.detail.data,
fileInfo = e.detail.file;
img.src = data;
}
var input = document.getElementById('inputId'),
img = document.getElementById('imgId');
input.onchange = function (e) {
loadFileFromInput(e.target,'dataurl');
};
input.addEventListener('fileLoaded',fileHandler)
Probably my code isn't as good as some users but I think you will get the point of it. Here you can see an example

Following is the working code.
<input type='file' onchange="readURL(this);" />
<img id="ShowImage" src="#" />
Javascript:
function readURL(input) {
if (input.files && input.files[0]) {
var reader = new FileReader();
reader.onload = function (e) {
$('#ShowImage')
.attr('src', e.target.result)
.width(150)
.height(200);
};
reader.readAsDataURL(input.files[0]);
}
}

Try this
window.onload = function() {
if (window.File && window.FileList && window.FileReader) {
var filesInput = document.getElementById("uploadImage");
filesInput.addEventListener("change", function(event) {
var files = event.target.files;
var output = document.getElementById("result");
for (var i = 0; i < files.length; i++) {
var file = files[i];
if (!file.type.match('image'))
continue;
var picReader = new FileReader();
picReader.addEventListener("load", function(event) {
var picFile = event.target;
var div = document.createElement("div");
div.innerHTML = "<img class='thumbnail' src='" + picFile.result + "'" +
"title='" + picFile.name + "'/>";
output.insertBefore(div, null);
});
picReader.readAsDataURL(file);
}
});
}
}
<input type="file" id="uploadImage" name="termek_file" class="file_input" multiple/>
<div id="result" class="uploadPreview">

What about this solution?
Just add the data attribute "data-type=editable" to an image tag like this:
<img data-type="editable" id="companyLogo" src="http://www.coventrywebgraphicdesign.co.uk/wp-content/uploads/logo-here.jpg" height="300px" width="300px" />
And the script to your project off course...
function init() {
$("img[data-type=editable]").each(function (i, e) {
var _inputFile = $('<input/>')
.attr('type', 'file')
.attr('hidden', 'hidden')
.attr('onchange', 'readImage()')
.attr('data-image-placeholder', e.id);
$(e.parentElement).append(_inputFile);
$(e).on("click", _inputFile, triggerClick);
});
}
function triggerClick(e) {
e.data.click();
}
Element.prototype.readImage = function () {
var _inputFile = this;
if (_inputFile && _inputFile.files && _inputFile.files[0]) {
var _fileReader = new FileReader();
_fileReader.onload = function (e) {
var _imagePlaceholder = _inputFile.attributes.getNamedItem("data-image-placeholder").value;
var _img = $("#" + _imagePlaceholder);
_img.attr("src", e.target.result);
};
_fileReader.readAsDataURL(_inputFile.files[0]);
}
};
//
// IIFE - Immediately Invoked Function Expression
// https://stackoverflow.com/questions/18307078/jquery-best-practises-in-case-of-document-ready
(
function (yourcode) {
"use strict";
// The global jQuery object is passed as a parameter
yourcode(window.jQuery, window, document);
}(
function ($, window, document) {
"use strict";
// The $ is now locally scoped
$(function () {
// The DOM is ready!
init();
});
// The rest of your code goes here!
}));
See demo at JSFiddle

Preview multiple images before it is uploaded using jQuery/javascript?
This will preview multiple files as thumbnail images at a time
Html
<input id="ImageMedias" multiple="multiple" name="ImageMedias" type="file"
accept=".jfif,.jpg,.jpeg,.png,.gif" class="custom-file-input" value="">
<div id="divImageMediaPreview"></div>
Script
$("#ImageMedias").change(function () {
if (typeof (FileReader) != "undefined") {
var dvPreview = $("#divImageMediaPreview");
dvPreview.html("");
$($(this)[0].files).each(function () {
var file = $(this);
var reader = new FileReader();
reader.onload = function (e) {
var img = $("<img />");
img.attr("style", "width: 150px; height:100px; padding: 10px");
img.attr("src", e.target.result);
dvPreview.append(img);
}
reader.readAsDataURL(file[0]);
});
} else {
alert("This browser does not support HTML5 FileReader.");
}
});
Working Demo on Codepen
Working Demo on jsfiddle
I hope this will help.

<img id="blah" alt="your image" width="100" height="100" />
<input type="file" name="photo" id="fileinput" />
<script>
$('#fileinput').change(function() {
var url = window.URL.createObjectURL(this.files[0]);
$('#blah').attr('src',url);
});
</script>

To Preview MULTIPLE Files and Single file in single function with reusable approach using Plain JavaScript
function imagePreviewFunc(that, previewerId) {
let files = that.files
previewerId.innerHTML='' // reset image preview element
for (let i = 0; i < files.length; i++) {
let imager = document.createElement("img");
imager.src = URL.createObjectURL(files[i]);
previewerId.append(imager);
}
}
<input accept="image/*" type='file' id="imageInput_1"
onchange="imagePreviewFunc(this, imagePreview_1)" />
<div id="imagePreview_1">This Div for Single Image Preview</div>
<hr />
<input class="form-control" accept="image/*" type='file' id="imageInput_2" multiple="true"
onchange="imagePreviewFunc(this, imagePreview_2)" />
<div id="imagePreview_2">This Div for Multiple Image Preview</div>

I have made a plugin which can generate the preview effect in IE 7+ thanks to the internet, but has few limitations. I put it into a github page so that its easier to get it
$(function () {
$("input[name=file1]").previewimage({
div: ".preview",
imgwidth: 180,
imgheight: 120
});
$("input[name=file2]").previewimage({
div: ".preview2",
imgwidth: 90,
imgheight: 90
});
});
.preview > div {
display: inline-block;
text-align:center;
}
.preview2 > div {
display: inline-block;
text-align:center;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="https://rawgit.com/andrewng330/PreviewImage/master/preview.image.min.js"></script>
Preview
<div class="preview"></div>
Preview2
<div class="preview2"></div>
<form action="#" method="POST" enctype="multipart/form-data">
<input type="file" name="file1">
<input type="file" name="file2">
<input type="submit">
</form>

For Multiple image upload (Modification to the #IvanBaev's Solution)
function readURL(input) {
if (input.files && input.files[0]) {
var i;
for (i = 0; i < input.files.length; ++i) {
var reader = new FileReader();
reader.onload = function (e) {
$('#form1').append('<img src="'+e.target.result+'">');
}
reader.readAsDataURL(input.files[i]);
}
}
}
http://jsfiddle.net/LvsYc/12330/
Hope this helps someone.

It's my code.Support IE[6-9]、chrome 17+、firefox、Opera 11+、Maxthon3
function previewImage(fileObj, imgPreviewId) {
var allowExtention = ".jpg,.bmp,.gif,.png"; //allowed to upload file type
document.getElementById("hfAllowPicSuffix").value;
var extention = fileObj.value.substring(fileObj.value.lastIndexOf(".") + 1).toLowerCase();
var browserVersion = window.navigator.userAgent.toUpperCase();
if (allowExtention.indexOf(extention) > -1) {
if (fileObj.files) {
if (window.FileReader) {
var reader = new FileReader();
reader.onload = function (e) {
document.getElementById(imgPreviewId).setAttribute("src", e.target.result);
};
reader.readAsDataURL(fileObj.files[0]);
} else if (browserVersion.indexOf("SAFARI") > -1) {
alert("don't support Safari6.0 below broswer");
}
} else if (browserVersion.indexOf("MSIE") > -1) {
if (browserVersion.indexOf("MSIE 6") > -1) {//ie6
document.getElementById(imgPreviewId).setAttribute("src", fileObj.value);
} else {//ie[7-9]
fileObj.select();
fileObj.blur();
var newPreview = document.getElementById(imgPreviewId);
newPreview.style.border = "solid 1px #eeeeee";
newPreview.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod='scale',src='" + document.selection.createRange().text + "')";
newPreview.style.display = "block";
}
} else if (browserVersion.indexOf("FIREFOX") > -1) {//firefox
var firefoxVersion = parseFloat(browserVersion.toLowerCase().match(/firefox\/([\d.]+)/)[1]);
if (firefoxVersion < 7) {//firefox7 below
document.getElementById(imgPreviewId).setAttribute("src", fileObj.files[0].getAsDataURL());
} else {//firefox7.0+ 
document.getElementById(imgPreviewId).setAttribute("src", window.URL.createObjectURL(fileObj.files[0]));
}
} else {
document.getElementById(imgPreviewId).setAttribute("src", fileObj.value);
}
} else {
alert("only support" + allowExtention + "suffix");
fileObj.value = ""; //clear Selected file
if (browserVersion.indexOf("MSIE") > -1) {
fileObj.select();
document.selection.clear();
}
}
}
function changeFile(elem) {
//file object , preview img tag id
previewImage(elem,'imagePreview')
}
<input type="file" id="netBarBig" onchange="changeFile(this)" />
<img src="" id="imagePreview" style="width:120px;height:80px;" alt=""/>

Default Iamge
#Html.TextBoxFor(x => x.productModels.DefaultImage, new {#type = "file", #class = "form-control", onchange = "openFile(event)", #name = "DefaultImage", #id = "DefaultImage" })
#Html.ValidationMessageFor(model => model.productModels.DefaultImage, "", new { #class = "text-danger" })
<img src="~/img/ApHandler.png" style="height:125px; width:125px" id="DefaultImagePreview"/>
</div>
<script>
var openFile = function (event) {
var input = event.target;
var reader = new FileReader();
reader.onload = function () {
var dataURL = reader.result;
var output = document.getElementById('DefaultImagePreview');
output.src = dataURL;
};
reader.readAsDataURL(input.files[0]);
};
</script>

Here's a solution if you're using React:
import * as React from 'react'
import { useDropzone } from 'react-dropzone'
function imageDropper() {
const [imageUrl, setImageUrl] = React.useState()
const [imageFile, setImageFile] = React.useState()
const onDrop = React.useCallback(
acceptedFiles => {
const file = acceptedFiles[0]
setImageFile(file)
// convert file to data: url
const reader = new FileReader()
reader.addEventListener('load', () => setImageUrl(String(reader.result)), false)
reader.readAsDataURL(file)
},
[setImageFile, setImageUrl]
)
const { getRootProps, getInputProps, isDragActive } = useDropzone({ onDrop })
return (
<div>
<div {...getRootProps()}>
{imageFile ? imageFile.name : ''}
{isDragActive ? <p>Drop files here...</p> : <p>Select image file...</p>}
<input {...getInputProps()} />
</div>
{imageUrl && (
<div>
Your image: <img src={imageUrl} />
</div>
)}
</div>
)
}

https://stackoverflow.com/a/59985954/8784402
ES2017 Way
// convert file to a base64 url
const readURL = file => {
return new Promise((res, rej) => {
const reader = new FileReader();
reader.onload = e => res(e.target.result);
reader.onerror = e => rej(e);
reader.readAsDataURL(file);
});
};
// for demo
const fileInput = document.createElement('input');
fileInput.type = 'file';
const img = document.createElement('img');
img.attributeStyleMap.set('max-width', '320px');
document.body.appendChild(fileInput);
document.body.appendChild(img);
const preview = async event => {
const file = event.target.files[0];
const url = await readURL(file);
img.src = url;
};
fileInput.addEventListener('change', preview);

Here is a much easy way to preview image before upload using pure javascript;
//profile_change is the id of the input field where we choose an image
document.getElementById("profile_change").addEventListener("change", function() {
//Here we select the first file among the selected files.
const file = this.files[0];
/*here i used a label for the input field which is an image and this image will
represent the photo selected and profile_label is the id of this label */
const profile_label = document.getElementById("profile_label");
//Here we check if a file is selected
if(file) {
//Here we bring in the FileReader which reads the file info.
const reader = new FileReader();
/*After reader loads we change the src attribute of the label to the url of the
new image selected*/
reader.addEventListener("load", function() {
dp_label.setAttribute("src", this.result);
})
/*Here we are reading the file as a url i.e, we try to get the location of the
file to set that as the src of the label which we did above*/
reader.readAsDataURL(file);
}else {
//Here we simply set the src as default, whatever you want if no file is selected.
dp_label.setAttribute("src", "as_you_want")
}
});
And here is the HTML;
<label for="profile_change">
<img title="Change Profile Photo" id="profile_label"
src="as_you_want" alt="DP" style="height: 150px; width: 150px;
border-radius: 50%;" >
</label>
<input style="display: none;" id="profile_change" name="DP" type="file" class="detail form-control">

for my app, with encryped GET url parameters, only this worked. I always got a TypeError: $(...) is null.
Taken from https://developer.mozilla.org/en-US/docs/Web/API/FileReader/readAsDataURL
function previewFile() {
var preview = document.querySelector('img');
var file = document.querySelector('input[type=file]').files[0];
var reader = new FileReader();
reader.addEventListener("load", function () {
preview.src = reader.result;
}, false);
if (file) {
reader.readAsDataURL(file);
}
}
<input type="file" onchange="previewFile()"><br>
<img src="" height="200" alt="Image preview...">

function assignFilePreviews() {
$('input[data-previewable=\"true\"]').change(function() {
var prvCnt = $(this).attr('data-preview-container');
if (prvCnt) {
if (this.files && this.files[0]) {
var reader = new FileReader();
reader.onload = function(e) {
var img = $('<img>');
img.attr('src', e.target.result);
img.error(function() {
$(prvCnt).html('');
});
$(prvCnt).html('');
img.appendTo(prvCnt);
}
reader.readAsDataURL(this.files[0]);
}
}
});
}
$(document).ready(function() {
assignFilePreviews();
});
HTML
<input type="file" data-previewable="true" data-preview-container=".prd-img-prv" />
<div class = "prd-img-prv"></div>
This also handles case when file with invalid type ( ex. pdf ) is choosen

Image preview before upload in angular 5

I have this code to show the image preview before uploading it. However I am working with Angular 5 so I have a .ts file instead of a .js one. How can I do the same in Angular 5? I also want to show the image in all browsers.
My HTML:
<input type='file' onchange="readURL(this);"/>
<img id="blah" src="http://placehold.it/180" alt="your image"/>
My CSS:
img {
max-width:180px;
}
input[type=file] {
padding: 10px;
background: #2d2d2d;
}
My JavaScript:
function readURL(input) {
if (input.files && input.files[0]) {
var reader = new FileReader();
reader.onload = function (e) {
document.getElementById('blah').src=e.target.result
};
reader.readAsDataURL(input.files[0]);
}
}

.html
Update event attr and handler param for input.
And you should use data binding for src attribute. Following will apply src if it's not null or undefined or hardcoded url ('http://placehold.it/180')
<input type='file' (change)="readURL($event);" />
<img id="blah" [src]="imageSrc || 'http://placehold.it/180'" alt="your image" />
.ts
In component ts file (class) you should have property imageSrc which be used in view (html) and your function should be a method of that class
...
imageSrc: string;
...
constructor(...) {...}
...
readURL(event: Event): void {
if (event.target.files && event.target.files[0]) {
const file = event.target.files[0];
const reader = new FileReader();
reader.onload = e => this.imageSrc = reader.result;
reader.readAsDataURL(file);
}
}

I know I'm late but just ran into this problem for both image and audio. The above solutions worked just fine for images but not so well for audio. I eventually got it all working by using a URL object instead of FileReader object that everyone is using.
something like the following
component.ts file ~
imgSrc = 'assets/path/to/default/image.jpeg'
imgFileSelected(event: any) {
if (event.target.files && event.target.files[0]) {
this.imgSrc = URL.createObjectURL(event.target.files[0]);
}
}
My component.html looks like~
<img [src]="imgSrc | sanitizeUrl"> <!-- using a Custom Pipe -->
Finally I created a custom pipe to rid the console of warnings.
my pipe is as follows~
#Pipe({
name: 'sanitizerUrl'
})
export class SanitizerUrlPipe implements PipeTransform {
constructor (
private sanitize: DomSanitizer
) {}
transform(value: string): SafeUrl {
return this.sanitize.bypassSecurityTrustUrl(value);
}
}
To see how I used this for the audio tag you can check out this link. It's only 2 extra lines of self-explanatory code.

I am using the below code to implement the image preview:
onFileChange(event: any) {
this.userFile = event.target.files[0];
this.imageSelected = this.userFile.name;
if (event.target.files && event.target.files[0]) {
const reader = new FileReader();
reader.onload = (e: any) => {
this.imageSrc = e.target.result;
};
reader.readAsDataURL(event.target.files[0]);
}}
Which works just fine and displays the image preview. The problem I originally faced was that I receeived the below error in the chrome developer tools each time an image preview is generated:
Everything worked fine though, there are no other errors.
If I clicked on the null:1 I was directed to the below:
After some fiddling and troubleshooting, I was able to find the solution which I have included in the edit below.
EDIT: Figured it out. I didn't have the || 'http://placehold.it/180'" included in the [src]=" on my component.html. Guess its a timing issue. Sorted now. no more error.

What about using #HostListner, since Angular doesn’t come with a built-in value accessor for file input.
#HostListener('change', ['$event.target.files'])
emitFiles( event: FileList ) {
const file = event && event.item(0);
this.onChange(file);
const reader = new FileReader();
reader.readAsDataURL(file); // toBase64
reader.onload = () => {
this.imageURL = reader.result as string; // base64 Image src
};
Then in the HTML, you may use something like:
<picture >
<source media='(min-width:0px)' [srcset]="imageURL">
<img src="" [alt]="Your photo">
</picture>

Kindly change like --> this.url = event.target.result;
readURL(event:any) {
if (event.target.files && event.target.files[0]) {
var reader = new FileReader();
reader.onload = (event:any) = > {
this.url = event.target.result;
}
reader.readAsDataURL(event.target.files[0]);
}
}

You might just need to change your javascript function to typescript as below.
readURL(input) {
if (input.files && input.files[0]) {
var reader = new FileReader();
reader.onload = (e:any) => {
(<HTMLImageElement>document.getElementById('blah')).src=e.target.result
//assuming element with id blah will always be an ImageElement
};
reader.readAsDataURL(input.files[0]);
}
}
That should be it.
Update
You can also define a property and bind it to image src and change its value accordingly as below:
In your .ts file before constructor, define a property as url and set its default value to http://placehold.it/180.
url: string = 'http://placehold.it/180';
You can update this property within reader.onload as below:
readURL(event:any) {
if (event.target.files && event.target.files[0]) {
var reader = new FileReader();
reader.onload = (event:any) => {
this.url = event.target.result;
}
reader.readAsDataURL(event.target.files[0]);
}
}
Your html will now look like below:
<input type='file' (change)="readURL(this);" />
<img id="blah" [src]="url" alt="your image" />

to preview the chosen image before uploading this code will help you it,s easy. it,s preview only image if anything else then it,s will give you error
this code is for component.ts
public imagePath;
imgURL: any;
public message: string;
preview(files) {
if (files.length === 0)
return;
var mimeType = files[0].type;
if (mimeType.match(/image\/*/) == null) {
this.message = "Only images are supported.";
return;
}
var reader = new FileReader();
this.imagePath = files;
reader.readAsDataURL(files[0]);
reader.onload = (_event) => {
this.imgURL = reader.result;
}
}
and these lines of code in component view
<span style="color:red;" *ngIf="message">{{message}}</span>
<input #file type="file" accept='image/*' (change)="preview(file.files)" />
<img [src]="imgURL" height="200" *ngIf="imgURL">

First we input the image by upload in choose file (imagedisplay.component.html) :
<input #Image type="file" (change)="handleFileInput($event.target.files)"/>
<img width="100%" *ngIf="imageUrl" [src]="imageUrl" class="image">
Then we use the function for reading and displaying further this is done so (imagedisplay.component.ts):
export class ImageDisplayComponent {
name = 'Angular';
fileToUpload: any;
imageUrl: any;
handleFileInput(file: FileList) {
this.fileToUpload = file.item(0);
//Show image preview
let reader = new FileReader();
reader.onload = (event: any) => {
this.imageUrl = event.target.result;
}
reader.readAsDataURL(this.fileToUpload);
}
}

For those who followed the accepted answer and had type 'string | ArrayBuffer' is not assignable to type 'string'; you need to add as string when affecting render result to your image src as the following
readURL(event: Event): void {
...
reader.onload = e => this.imageSrc = reader.result as string;
...
}
}

Push filepath of dynamically inserted image into array in javascript

I'm trying to make an image slider. I have an array of objects like this:
var slides = [
{
img: 'images/one.jpg',
text: 'First Image'
},
{
img: 'images/two.jpg',
text: 'Second Image'
}
];
I need to have the functionality to add more images into the image slider. Hence I need to obtain the file path of the image I will be uploading and push that file path into this slides array.
I have gone through this SO answer, which effectively teaches how to upload and display an image, but my needs are different.
HTML
<div id="slide-container">
</div>
<div id="panel-container">
<form>
<label>
<span>Image Text</span>
<input type="text" class="form-control" id="image-related-text">
</label>
<label>
<span>Duration</span>
<input type="text" class="form-control" id="time-duration">
</label>
<div id="d">
<input type="file" id="image-upload">
</div>
<button id="add" disabled="true">Add to Container</button>
</form>
</div>
JS
var global_image_url = "";
// add the image and the relevant text in the slider on click of this button
$('#add').click(function(){
var imageRelatedText = $('#image-related-text').val();
var timeDuration = $('#time-duration').val();
// a new object to be pushed inside the 'slides' array
var temp_obj = {
img: 'nothing for now :|', //this should contain the image url
text: imageRelatedText
};
})
$('#image-upload').change(function(){
global_image_url = readUrl(this);
console.log(global_image_url);
});
// this function gets called when an image file is chosen
function readUrl(input){
var img = $('<img>');
var local_image_url = ""; // thought I would store the file path in this variable
if (input.files && input.files[0]) {
var reader = new FileReader();
reader.onload = function (e) {
local_image_url = JSON.stringify(e.target.result);
img.attr('src', e.target.result);
img.attr('height','100%');
img.attr('width','97%');
}
reader.readAsDataURL(input.files[0]);
}
console.log(local_image_url); // chrome developer tools freezes
return local_image_url;
}
I thought e.target.result would give the url but that's not the case. It's just another object (printed in the console once).
So how do I achieve my requirements?
Thanks!

yes e.target.result will the url, but remember FileReader reader the file content as asynchronous, if you want to output the value, you need to add some callback like :
$('#image-upload').change(function(){
readUrl(this,function(){
console.log(global_image_url);
});
});
// this function gets called when an image file is chosen
function readUrl(input,callback){
var img = $('<img>');
var local_image_url = ""; // thought I would store the file path in this variable
if (input.files && input.files[0]) {
var reader = new FileReader();
reader.onload = function (e) {
typeof callback == 'function' && callback(e.target.result);
local_image_url = JSON.stringify(e.target.result);
img.attr('src', e.target.result);
img.attr('height','100%');
img.attr('width','97%');
}
reader.readAsDataURL(input.files[0]);
}
}

JQUERY adding image attribute

I have the following jquery code which i want to add the styling to the image uploaded. Does any know how i can add style after the src in the jquery.
Link
<div id="container">
<input id="fileUpload" type="file" />
<br />
<div id="image-container"> </div>
</div>
$("#fileUpload").on('change', function() {
if (typeof(FileReader) == "undefined") {
alert("Your browser doesn't support HTML5, Please upgrade your browser");
} else {
var container = $("#image-container");
//remove all previous selected files
container.empty();
//create instance of FileReader
var reader = new FileReader();
reader.onload = function(e) {
$("<img />", {
// I want to add the syle here
"src": e.target.result
}).appendTo(container);
}
reader.readAsDataURL($(this)[0].files[0]);
}
});

// I want to add the syle here
You can simply add the style like:
"style": "width:100px;height:100px",
$("#fileUpload").on('change', function() {
if (typeof(FileReader) == "undefined") {
alert("Your browser doesn't support HTML5, Please upgrade your browser");
} else {
var container = $("#image-container");
//remove all previous selected files
container.empty();
//create instance of FileReader
var reader = new FileReader();
reader.onload = function(e) {
$("<img />", {
"style": "width:100px;height:100px",
"src": e.target.result
}).appendTo(container);
}
reader.readAsDataURL($(this)[0].files[0]);
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="container">
<input id="fileUpload" type="file" />
<br />
<div id="image-container"> </div>
</div>

This is one way to do it.
let imageStyle = "width:150px";
$("#image-container").append("<img id='theImg' src='" + e.target.result +"' style='"+ imageStyle +"'/>");
This can also be done as
var img = $('<img>');
img.attr('src', e.target.result);
img.attr('style', imageStyle);
img.appendTo('#image-container');

jQuery image preview on change

I'm using the function below to display an image preview after selecting the file.
If the file extension eq the fileTypes it should display the image preview, but it doesn't.
Wat i'm doing wrong ?
var previewImage = function(input, block){
var fileTypes = ['jpg', 'jpeg', 'png'];
var extension = input.files[0].name.split('.').pop().toLowerCase(); /*se preia extensia*/
var isSuccess = fileTypes.indexOf(extension) > -1; /*se verifica extensia*/
if(isSuccess){
var reader = new FileReader();
reader.onload = function (e) {
block.attr('src', e.target.result);
};
}else{
alert('Fisierul selectat nu este acceptat!');
}
};
$s(document).on('change', '#image', function(){
previewImage(this, $s('.imagePreview'));
});
And here is my input.
<div class="control-group form-group">
<label for="image">Imaginea</label>
<div id="imagePreview">
<img src="/admin/mmadmin/template/assets/img-upload-150_150.png" class="imagePreview thumbnail" style="max-width:150px; max-height:150px;" />
</div>
<input type="file" name="imageFile" id="image" />
</div>

Working fiddle: http://jsfiddle.net/8ns1s0zn/1/
Ok so there's a couple of issues:
first of all, that s after jQuery's $.
$(document).on('change', '#image', function(){
previewImage(this, $('.imagePreview'));
});
Then, you forgot to tell the reader to read the data:
reader.readAsDataURL(input.files[0]);