Javascript function 发布到 Github 时未定义

Question

I create a function that should make my div visible on click. It works fine locally, but when I publish my project on Github pages I get an error " Uncaught ReferenceError: btnClick is not defined at HTMLElement.onclick ((index):51) ". Here's the script code:

document.getElementById('btn-share').onclick = function btnClick() {

  let comma = document.getElementById('comm-share');
  let tri = document.getElementById('trio');

  if (comma.style.visibility === "hidden") {

    comma.style.visibility = 'visible';
    tri.style.visibility = 'visible';
  }
  else {
    comma.style.visibility = 'hidden';
    tri.style.visibility = 'hidden';
  }
};

Image: HTML

Answer 1

What you are doing is assigning the.onclick while making another function called btnClick() . There are a few ways to fix your code:

 document.getElementById('btn-share').onclick = function () { let comma = document.getElementById('comm-share'); let tri = document.getElementById('trio'); if (comma.style.visibility === "hidden") { comma.style.visibility = 'visible'; tri.style.visibility = 'visible'; } else { comma.style.visibility = 'hidden'; tri.style.visibility = 'hidden'; } };

This doesn't make any btnClick() but just assigns a function to onclick . This would be the best choice if you wanted to call btnClick() when you wanted to (well, you can do element.onclick).

 function btnClick() { let comma = document.getElementById('comm-share'); let tri = document.getElementById('trio'); if (comma.style.visibility === "hidden") { comma.style.visibility = 'visible'; tri.style.visibility = 'visible'; } else { comma.style.visibility = 'hidden'; tri.style.visibility = 'hidden'; } }; document.getElementById('btn-share').onclick = btnClick;

The above assigns it to the function.

 document.getElementById('btn-share').addEventListener("click", function() { let comma = document.getElementById('comm-share'); let tri = document.getElementById('trio'); if (comma.style.visibility === "hidden") { comma.style.visibility = 'visible'; tri.style.visibility = 'visible'; } else { comma.style.visibility = 'hidden'; tri.style.visibility = 'hidden'; } });

And the last one uses the .addEventListener() function to assign the function to the onclick .

It's your choice what you want to use.