JavaScript validation on image field

Here we are implementing Validation of image extension before uploading file Using JavaScript. Goal of this tutorial to first validate the upload file is an image and if it is an image I will upload it otherwise fail to upload and show the error.

HTML code for image uploading

<input type="file" name="imagefile" id="imagefile" onchange="return ValidateFileUpload()" />

JavaScript validation code for image uploading

<SCRIPT type="text/javascript">
function ValidateFileUpload(){
    var fuData = document.getElementById('imagefile');
    var FileUploadPath = fuData.value;
    //To check if user upload any file
    if (FileUploadPath == '') {
        alert("Please upload an image");
    else {
        var Extension = FileUploadPath.substring(
        FileUploadPath.lastIndexOf('.') + 1).toLowerCase();
        //The file uploaded is an image
        if (Extension == "gif" || Extension == "png" || Extension == "bmp" || Extension == "jpeg" || Extension == "jpg")
            // To Display
            if (fuData.files && fuData.files[0])
                var reader = new FileReader();
                reader.onload = function(e) {
        //The file upload is NOT an image
        else {
            alert("Photo only allows file types of GIF, PNG, JPG, JPEG and BMP. ");

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