File Upload not leaving file path

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I am using file upload for storing image in database. I am using javascript for validation of valid file type and size. when my validation is false it gives alert but not leaving the file path i choose.

JavaScript

function fileCheck(obj) 
        {
            var fileUploadPath = obj.value;
            var fileSize = obj.files[0].size;
            var extension = fileUploadPath.substring(fileUploadPath.lastIndexOf('.') + 1).toLowerCase();
            if (extension == "gif" || extension == "png" || extension == "bmp" || extension == "jpeg" || extension == "jpg") 
            {
                
            }
            else 
            {
                alert("Photo only allows file types of GIF, PNG, JPG, JPEG and BMP.");
                
            }
            if (fileSize > 1024) 
            {
                alert("Photo size should not exceeds 1 MB");
                return false;
            }

<asp:FileUpload ID="FileUpload1" runat="server" onchange="fileCheck(this);"/>

Posted 9-Apr-14 1:01am

Raj Negi

Updated 9-Apr-14 1:04am

v2

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2 solutions

Solution 1

See the changes code

C#

function fileCheck(obj)
        {
            var fileUploadPath = obj.value;
            var fileSize = obj.files[0].size;
            var extension = fileUploadPath.substring(fileUploadPath.lastIndexOf('.') + 1).toLowerCase();
            if (extension == "gif" || extension == "png" || extension == "bmp" || extension == "jpeg" || extension == "jpg")
            {

            }
            else
            {
                alert("Photo only allows file types of GIF, PNG, JPG, JPEG and BMP.");
       Clear();return false;
            }
            if (fileSize > 1024)
            {
                alert("Photo size should not exceeds 1 MB");
          Clear();
                return false;
            }

Declare Clear function

C#

function Clear()
 {
 var clrFile = document.getElementById("FileUpload1");
 clrFile.select();
 var clr=clrFile.createTextRange();
 clr.execCommand('delete');
 clrFile.focus();

 }

Posted 9-Apr-14 1:58am

sankarsan parida

Comments

Raj Negi 19-Apr-14 4:45am

There is one problem, i am using 5 file uploads and at run time i detect which file upload is taking file path, your clear() function is only for one file upload...can you write one clear function for every file upload. I dont want 5 clear function for each file upload. Thanks

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Raj Negi · Accepted Answer · 2014-04-25T10:52:00

Solution 2

There is a simple way to do it, when validation fails and else part is executing...put
obj.value = ""; after the alert part and before return.

else
{
alert("Photo only allows file types of GIF, PNG, JPG, JPEG and BMP.");
obj.value = "";
return false;
}

Posted 25-Apr-14 10:52am

Raj Negi