I’m not going to parse through your syntax errors. Use a code linter yourself to do that. They are built into even free IDE’s these days and you can even paste your code into online syntax checkers
You don’t set innerHTML for an input
you set it’s value
Change
document.getElementById("WgetID").innerHTML = "Link added to wget"
To
document.getElementById("WgetID").value = "Link added to wget"
3
solved Javascript won’t work in PHP.