simple JS file type check by extension [solved]
Posted: Fri Mar 09, 2007 2:00 pm
So this piece of code is inside of one of my functions. I just want to make sure that the file being uploaded ends in .jpg, .jpeg, .gif, .png... before I do server side validation of course. It's just a little convenience to the end-user.
snippet:
I get the error: "Object doesn't support this property or method".
snippet:
Code: Select all
var docform = document.forms[0];
if(
!docform.ep_image.value.toLowerCase.match(/.+\.jpg$/) &&
!docform.ep_image.value.toLowerCase.match(/.+\.jpeg$/) &&
!docform.ep_image.value.toLowerCase.match(/.+\.gif$/) &&
!docform.ep_image.value.toLowerCase.match(/.+\.png$/)
)
{
alert('Invalid Image Type. Valid file types are: JPEG, JPG, PNG, GIF');
docform.submit.disabled = false;
docform.submit.value = 'Upload Image';
return false;
}