Javascript在Internet Explorer 8中不起作用

Question

I have a javascript to ask the user to confirm that they want to leave my website. This is how it looks:

  function confirmLeave()
  {
    if(confirm("Do you want to leave my webpage?")) {
      return true;
    } else {
      if(window.event) {
        window.event.returnValue = false;
      } else {
        e.preventDefault();
      }
      return false;
    }
  }

function initiate ()
{
    var links = document.getElementsByClassName("external-link");
    for (var i = 0; i < links.length; i++) {
        links[i].onclick = confirmLeave;
    }   

}
window.onload = initiate;

It works good in Firefox and Chrome but not in IE8. I know that document.getElementsByClassName doesn't work and I tried to remake my code using document.getElementsbyTakeName but haven't got it to work. This is what I came up with:

function confirmLeave()
      {
        if(confirm("Do you want to leave my webpage?")) {
          return true;
        } else {
          if(window.event) {
            window.event.returnValue = false;
          } else {
            e.preventDefault();
          }
          return false;
        }
      }

funciton initiate ()
{
    if(document.getElementsByClassName)
    {   
    var links = document.getElementsByClassName("external-link");
    for (var i = 0; i < links.length; i++) {
        links[i].onclick = confirmLeave;
    } 
    } else {
     var links = document.getElementsByTagName("external-link");
    for (var i = 0; i < links.length; i++) {
        links[i].onclick = confirmLeave;
    }
    }
}
window.onload = initiate;

The external-link is the class I'm using for the links that are to leave my webpage.

Answer 1

Try using document.querySelectorAll(".external-link")

source

Answer 2

consider including jQuery library if that's a viable option for you. then you may write something like this:

$('.external-link').click(function() { confirmLeave() });

Answer 3

The problem here is that document.getElementsByTagName() takes an element as it's input, eg div , span or a . external-link is not an element, so it'll never return anything.

For IE8, you can use document.querySelectorAll(".external-link") . It takes a CSS selector as it's input.

If you need to support older browsers too, you could try using https://gist.github.com/2397759 which is a polyfill to make getElementsByClassName work on browsers that don't support it natively.