Java Script Validation for file uploading

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Hello every one,
I got stuck in java script validation in product adding form.In that page i have file upload control to upload product image.I am not getting how to validate that using java script.If image is not uploaded to that control i want to display "Upload Image" message in Label.How to accomplish this? Please help me.
The script i have written is
"

C#

var fileup = document.getElementById('<%=FileUploadImg.ClientID %>').value;
        if (fileup == "") {
            document.getElementById("lblFileUploadImg").innerHTML = "<font color='red'>Upload Image File</font>";
             document.getElementById('<%=FileUploadImg.ClientID %>').focus();
            return false;
        } else {
            document.getElementById("lblFileUploadImg").innerHTML = "";
        }

"
The control i have used is
" <asp:FileUpload ID="FileUploadImg" runat="server" Width="217px" Height="20px" />
<asp:Label ID="lblFileUploadImg" runat="server" > "

Please help me.Thanks in advance.

Posted 23-Mar-14 22:37pm

Member 10194425

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Comments

shahed.sohail 24-Mar-14 6:27am

With jQuery you could simply do this:

$('#myFile').bind('change', function() {
if(this.files[0].size>...){
alert('File is too big');
};

});

maybe this is what you are looking for:

$("input:file").change(function () {
if ($(this).val() !== "") {
var ul_file = $(this).val();
var extension = ul_file.substr((ul_file.lastIndexOf('.') + 1));
var accepted_file_endings = ["jpg", "jpeg", "bmp", "gif", "tif", "png"];
extension = extension.toLowerCase()
if ($.inArray(extension, accepted_file_endings) !== -1) {
...

3 solutions

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shahed.sohail · Answer 1 · 2014-03-24T00:25:00

You can get validate file uploading using JavaScript like this.

ASP.NET

<script type="text/javascript">
        function validate() {
            var uploadcontrol = document.getElementById('<%=FileUploadImg.ClientID%>').value;

            //Regular Expression for fileupload control.
            var reg = /(.doc|.docx|.pdf)$/i;

            if (uploadcontrol.length > 0)
            {
                //Checks with the control value.
                if (reg.test(uploadcontrol))
                {
                    document.getElementById('<%=lblFileUploadImg.ClientID%>').innerHTML = "<font color="green">Upload Image File</font>";
                    return true;
                }
                else 
                {
                    //If the condition not satisfied shows error message.
                    document.getElementById('<%=lblFileUploadImg.ClientID%>').innerHTML = "Error while upload image";
                    return false;
                }
            }
        } //End of function validate.
    </script>


<asp:fileupload id="FileUploadImg" runat="server" width="217px" height="20px" xmlns:asp="#unknown" />
<asp:label id="lblFileUploadImg" runat="server" xmlns:asp="#unknown" />
<asp:button runat="server" text="Upload" id="btnupload" onclientclick="return validate();" xmlns:asp="#unknown" />

U can try with JQuery as well.

Murali0195 · Answer 2 · 2014-03-24T02:29:00

Solution 2

Hi...
Fileupload control validation in javascript for particular file types.[^]
Thank u.

Posted 24-Mar-14 2:29am

Murali0195

jacobjohn196 · Answer 3 · 2014-03-24T03:21:00

Solution 3

You have an option to use, ASP .Net RequiredFieldValidator control for file upload control. Easy method ;)

Posted 24-Mar-14 3:21am

jacobjohn196