File Upload Validation Using JQuery

If in HTML Form, you have a file input, you can validate the extensions as soon as the user upload a file using the JQuery Code given below :

Here’s the HTML Code :


<input id="fileupload" name="fileupload" type="file" />


Here’s the JQuery Code:


var fileTypes = ['jpg', 'jpeg', 'png', 'pdf']; //acceptable file types
function readURL(input) {
if (input.files && input.files[0]) {
var extension = input.files[0].name.split('.').pop().toLowerCase(), //file extension from input file
isSuccess = fileTypes.indexOf(extension) > -1; //is extension in acceptable types
if (isSuccess) {
var reader = new FileReader();
reader.readAsDataURL(input.files[0]);
} else {
alert("File should be in jpg, png, jpeg or pdf format.")
return false;
}
}
}
$("#fileupload").change(function(){ //Dynamically called when a file is uploaded
readURL(this);
});

When the user uploads a file, readURL function is called. In this function it will be checked if the extension of the uploaded file is in the permitted fileTypes array.

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