Question

I have a file that has an extention either:

.doc or .docx

I wanted to link it this way:

document.getElementById("file").innerHTML = "View file sent <a href='../folder/filename" +
(what syntax do I need to add here if I wanted to print which extention file is exist on that folder)

In PHP we can do this

var1 = ".doc";
var2 = ".docx";

var1 ? var1 : var2;

What is the equivalent of this in JavaScript?

Answer 1

I’m not sure what you’re doing here:

var1=".doc";
var2=".docx";

var1? var1 : var2;

This will always return “.doc” because var1 will always evaluate to true, regardless of whether you’re using PHP or Javascript.

---

It sounds like you might be after something like this instead:

// this function is from http://stackoverflow.com/a/3646923/1188942
function UrlExists(url)
{
    var http = new XMLHttpRequest();
    http.open('HEAD', url, false);
    http.send();
    return http.status!=404;
}

var ext;
if (UrlExists("http://www.mywebsite.com/folder/file.doc"))
    ext = ".doc";
else
    ext = ".docx";