prepareslideshow.js

《JavaScript DOM编程艺术》一书中的配套源代码

function prepareSlideshow() {
// Make sure the browser understands the DOM methods
  if (!document.getElementsByTagName) return false;
  if (!document.getElementById) return false;
// Make sure the elements exist
  if (!document.getElementById("linklist")) return false;
  var slideshow = document.createElement("div");
  slideshow.setAttribute("id","slideshow");
  var preview = document.createElement("img");
  preview.setAttribute("src","topics.gif");
  preview.setAttribute("alt","building blocks of web design");
  preview.setAttribute("id","preview");
  slideshow.appendChild(preview);
  var list = document.getElementById("linklist");
  insertAfter(slideshow,list);
// Get all the links in the list
  var links = list.getElementsByTagName("a");
// Attach the animation behavior to the mouseover event
  links[0].onmouseover = function() {
    moveElement("preview",-100,0,10);
  }
  links[1].onmouseover = function() {
    moveElement("preview",-200,0,10);
  }
  links[2].onmouseover = function() {
    moveElement("preview",-300,0,10);
  }
}
addLoadEvent(prepareSlideshow);