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?
228 Answers
imgInp.onchange = evt => { const [file] = imgInp.files if (file) { blah.src = URL.createObjectURL(file) } }<form runat="server"> <input accept="image/*" type='file' /> <img 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/> <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/> <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 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 THIS IS THE SIMPLEST METHOD
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 src="" width="100px" height="100px"/> </form>To preview multiple image click here
1The 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 src="" alt=""/> <div></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:
0Short two-liner
This is size improvement of cmlevy answer - try
<input type=file oninput="pic.src=window.URL.createObjectURL(this.files[0])"> <img />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> <div></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.
3Yes. It is possible.
Html
<input type="file" accept="image/*" onchange="showMyImage(this)" /> <br/> <img 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.
0Clean and simple JSfiddle
This will be useful when you want The event to triggered indirectly from a div or a button.
<img src="" > <input 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> 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>'); img.attr('src', e.target.result); img.appendTo('#form1'); } reader.readAsDataURL(input.files[i]); } } } $("#imgUpload").change(function(){ readURL(this); }); } Markup (HTML)
<form runat="server"> <input type="file" multiple/> </form> 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=""></script> </head> <body> <input type="file" name="image[]" multiple /><br/> <div></div> </body>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 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" name="termek_file" multiple/> <div>What about this solution?
Just add the data attribute "data-type=editable" to an image tag like this:
<img src="" 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 = $("#" + _imagePlaceholder); _img.attr("src", e.target.result); }; _fileReader.readAsDataURL(_inputFile.files[0]); } }; // // IIFE - Immediately Invoked Function Expression // ( function (yourcode) { "use strict"; // The global jQuery object is passed as a parameter yourcode(window.jQuery, window, document); }( function ($, window, document) { "use strict"; // The $ is now locally scoped $(function () { // The DOM is ready! init(); }); // The rest of your code goes here! })); Preview multiple images before it is uploaded using jQuery/javascript?
This will preview multiple files as thumbnail images at a time
Html
<input multiple="multiple" name="ImageMedias" type="file" accept=".jfif,.jpg,.jpeg,.png,.gif" value=""> <div></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."); } }); I hope this will help.
1I 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=""></script> <script src=""></script> Preview <div></div> Preview2 <div></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]); } } } 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" onchange="changeFile(this)" /> <img src="" 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"/> </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> ) } <img alt="your image" width="100" height="100" /> <input type="file" name="photo" /> <script> $('#fileinput').change(function() { var url = window.URL.createObjectURL(this.files[0]); $('#blah').attr('src',url); }); </script> 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" src="as_you_want" alt="DP" > </label> <input name="DP" type="file"> for my app, with encryped GET url parameters, only this worked. I always got a TypeError: $(...) is null. Taken from
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" /> <div class = "prd-img-prv"></div> This also handles case when file with invalid type ( ex. pdf ) is choosen
