check file extension and file existence with javascript

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hi Currently I've made a check if file exist or not in JavaScript,can anyone tell me how to check for certain extensions in the same function.

JavaScript

function validateUploadW9(source, e) {
    var fileName = FSObject.$("[id$=fupUploadW9]")[0].value;
    if (fileName == "") {
        var length = FSObject.$("[id$=lblUploadW9FileName]").length;
        if (FSObject.$("[id$=lblUploadW9FileName]")[length - 1].innerHTML == "") {
            e.IsValid = false;
        }
        else {
            e.IsValid = true;
        }
    }
    else {
        e.IsValid = true;
    }
}

Please post your answers ASAP.

Posted 6-Dec-12 0:16am

pree_kh

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pree_kh · Accepted Answer · 2012-12-06T01:06:00

C#

var fileExtension = fileName.substring(fileName.lastIndexOf('.') + 1);
    if (fileName == "")
    {
       var length = FSObject.$("[id$=lblUploadW9FileName]").length;
       if (FSObject.$("[id$=lblUploadW9FileName]")[length - 1].innerHTML == "")
        {
           e.IsValid = false;
       }
       else
       {
           if (fileExtension != ".doc" || ".DOC " || ".txt" || ".docx" || ".DOCX" || ".TXT" || ".xls" || ".xlsx" || ".XLS" || ".XLSX" || ".pdf" || ".PDF")
            {
                FSObject.$("[id$=cusUploadW9]")[0].innerHTML = "Invalid extension, only .doc, .docx, .txt, .xls, .xlsx, .pdf and .jpg extensions are supported";
                e.IsValid = false;
            }
            else
           {
               e.IsValid = true;
           }
       }
   }
   else {
       if (fileExtension != ".doc" || ".DOC " || ".txt" || ".docx" || ".DOCX" || ".TXT" || ".xls" || ".xlsx" || ".XLS" || ".XLSX" || ".pdf" || ".PDF")
       {
           FSObject.$("[id$=cusUploadW9]")[0].innerHTML = "Invalid extension, only .doc, .docx, .txt, .xls, .xlsx, .pdf and .jpg extensions are supported";
           e.IsValid = false;
       }
       else
       {
           e.IsValid = true;
       }
     }

}