jQuery - INPUT type=File , Image FileType Validation options?

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I have the following:

<input id="user_profile_pic" name="user[profile_pic]" type="file">

On the server I check to make sure it's an image, but I want to check on the clientside first.

How with jQuery can I alert the user if the file input file selected isn't a gif,jpg,png, or bmp?

Thanks

You want to check what the value of the element is, something along the lines of:

$("#user_profile_pic").change(function() {

    var val = $(this).val();

    switch(val.substring(val.lastIndexOf('.') + 1).toLowerCase()){
        case 'gif': case 'jpg': case 'png':
            alert("an image");
            break;
        default:
            $(this).val('');
            // error message here
            alert("not an image");
            break;
    }
});

Edit

Code changed based on comment - now removes the value of the selected file if not an image.

jQuery: validate file types - JSFiddle, You want to check what the value of the element is, something along the lines of: $("#user_profile_pic").change(function() { var val = $(this).val();� Podcast #128: We chat with Kent C Dodds about why he loves React and discuss what life was like in the dark days before Git. Listen now..

It's pretty simple not needed any JavaScript validations . Just write this and it'll accept only image files.

 <input type="file" multiple accept='image/*'> 

File Type Validation while Uploading it using JavaScript , Test your JavaScript, CSS, HTML or CoffeeScript online with JSFiddle code editor. <label for="image">Upload image (JPEG only)</label>. 4 checkFileType = function(options) { extension = file.substring(file. inArray( extension, options. This article describes about “validating file extension using Jquery form validation” We can implement file extension validation by using normal html5 “accept” attribute. But the problem with this approach is when the user selects “All Files” option in the dialog it will show all files and when user select any unrelated file it will

You could use a regular expression:

var val = $("#user_profile_pic").val();
if (!val.match(/(?:gif|jpg|png|bmp)$/)) {
    // inputted file path is not an image of one of the above types
    alert("inputted file path is not an image!");
}

Of course you could add more formats to the regular expression. There are more complex and comprehensive ways to accomplish this, but this method will accomplish the task as long as the image file path inputted ends in a standard image file extension.

How to get file input by selected file name without path using jQuery , In this article, we will learn how to implement file type validation by Using JavaScript, you can easily check the selected file extension with html >. < head >. < title >. File Type Validation while. Uploading it p >Upload an Image</ p > Remove the Chrome's "No file chosen option" from a file input using� A lightweight jQuery plugin that lets you to create multiple image upload with preview and delete feature. The plugin supports drag & drop functionality to upload multiple images. It uses a static HTML form without using AJAX that holds images before upload. Users can drag multiple images in HTML (upload) form and see image thumbnail before upload.

There may be browsers that allow you to create a <img/> of the given path, by that you could check if it's a real image or not(if not the onerror-event should fire on the image and it will have a width/height of 0).

But as this only works in some browsers and is an security-risk(in my mind) I would'nt suggest to do this, so my answer is: you can't validate there anything.

Checking the file-extensions like suggested by Alex may be an option, but the file-extension does not guarantee if it's a image. However, as a simple pre-check(not validation) it could be useful.

How to Get Selected File Name from Input Type File Using jQuery, Example 1: In this example we will display the file name with the extension by using the change() method and the file will be selected by the� <input type="file" accept="image/*" /> But this is not a good way. you have to code on the server side to check the file an image or not. Check if image file is an actual image or fake image

Input type file must allow images only, How to fire event on file select in jQuery � How to customize file input type box using CSS and jQuery � How to get the value of selected option in a select box using� Using type="file" and accept="image/*" (or the format you want), allow the user to chose a file with specific format. But you have to re check it again in client side, because the user can select other type of files. This works for me.

FormValidation • file validator, i must allow only images but here i use coding var fl = document. its validating fine but even after that i clicked some PDF or Excel file it allows to file input has an "accept" attribute that takes mime types and/or can declare image/*, video/* etc I can change the extension, or may not have an extension. Uses the HTML5 file API to look at the type attribute of one or more selected files and validate that each matches the specified mime-type. If nothing is specified, only images are allowed (image/*). You can specify multiple mime-types by separating them with a comma, e.g. "image/x-eps,application/pdf". Works with type="file" inputs.

HTML input accept Attribute, The HTML attributes are used to set the validator options via the Declarative plugin extension, data-fv-file___extension, String, The allowed extensions, separated by a comma only allows to upload JPEG, PNG image and PDF document. This was a very important issue for me in order for my site to be multilingual. So here is my conclusion tested in Firefox and Chrome. jQuery trigger comes in handy.

jQuery File Validator, Example. Specify what file types the user can pick from the file input dialog box: < form action="/action_page.php"> <label for="img">Select image:</label> <input� This is minor, but it was brought to my attention that the validation of input type=&quot;file&quot; behaves differently than others. For example, on the Form validation page, the required field er

Comments
  • Uncaught TypeError: Object #<an Object> has no method 'onchange'
  • .change works. But it's still no good, as while it errors, it still selects and is showing the file on the page.
  • Adding this worked, ".val('');" but I don't know how compliant that is... anyone?
  • .val(''); is a jQuery call, and all it does is set the value attribute of the element to be '' - which is the same is was on page load.
  • For googlers; AFAIK not all browsers allow you to reset a file input's value. The most elegant crossbrowser solution I have found is element.wrap('<form>').closest('form').get(0).reset(); element.unwrap();
  • that's cool but it doesn't work as validation! it's just for easier handling to select an image from a folder with different extension. as you can see here -> imageshack.us/a/img20/8451/switchzz.jpg
  • One defining it in the HTML can be overridden in some browsers by choosing "all files" in the file dialog. Two, even though it in it of itself is not 100% fool proof, validating it with javascript is yet another appended deterrent in the fight against malicious activities. All in all you want to have your backend validate before accepting, and as an added bonus by checking and validating the first few bytes of the file to validate it is a type you really want, since by extension alone is never a fool proof means.
  • What if there are three input files and I want to validate them one by one? var val1=..., var val2=... var val3 =... if (!val.match(/(?:gif|jpg|png|bmp)$/)) {
  • This does not work, change a none image e.g. .a pdf to a .png and it starts with data:image but is not an actual image.
  • none image sources have another mime types. pdf mentioned above, has data:application/pdf, for example
  • @Phil, what browser do you use? My chrome does not use file extension for mime type recognition.