Im trying to check an input files extension with JavaScript, using:
if(extension != 'jpeg, JPEG, JPG, jpg'){}
I want the statement to read logically :'if variable extension doesn't equal jpeg, or JPEG, or..' and so on
but this doesn't work, how do I code this properly?
If you don't want to use regex you can do something like:
extension = extension.toLowerCase();
if(extension != 'jpeg' && extension != 'jpg')
This will also filter file extensions like JpEg.
if(extension != 'jpeg'|| extension != 'JPEG' || extension != 'JPG' || extension !='jpg'){
// would do the magic for you ;-)
}
It's simple javascript not jquery!
true. Use and instead of or.This is a little cleaner since you can define the array of acceptable extensions elsewhere.
if ($.inArray(extension.toLowerCase(), ["jpeg", "jpg"]) !== -1) {
// do something
}
Using a regular expression here will make your life easier:
if (!extension.match(/^jpe?g$/i)) {
alert("Bad extension");
}