Difference between revisions of "Template:BIT/js/third"

Revision as of 19:36, 17 October 2018

window.onscroll = function () {

   var height = getHeight()
   var menu = document.getElementById("third-menu")
   var h = document.getElementsByTagName("h2");
   var h0 = h[0].offsetTop
   if(height > h0 - 50) {
       var num = height -h0 +50
       menu.style.marginTop = num + "px"
   }
   else
   {
       menu.style.marginTop = 0;
   }
   clear()
   for(var i=h.length-1;i>=0;i--)
   {
       if(height + 111 > h[i].offsetTop)
       {
           var list = document.getElementsByClassName("third-menu-item")
           list[i].style.color = "blue"
           break
       }
   }

}

function setMenu() {

   var height = getHeight()
   var menu = document.getElementById("third-menu")
   var h = document.getElementsByTagName("h2");
   if(height > 100) {
       var num = height -100
       menu.style.marginTop = num + "px"
   }
   else
   {
       menu.style.marginTop = 0;
   }
   clear()
   for(var i=h.length-1;i>=0;i--)
   {
       if(height + 111 > h[i].offsetTop)
       {
           var list = document.getElementsByClassName("third-menu-item")
           list[i].style.color = "blue"
           break
       }
   }

}

function clear() {

   var list = document.getElementsByClassName("third-menu-item")
   for(let i of list){
       i.style.color = "black"
   }

}

function getHeight() {

   var yScroll
   if (self.pageYOffset) {
       yScroll = self.pageYOffset;
   } else if (document.documentElement && document.documentElement.scrollTop) { // Explorer 6 Strict
       yScroll = document.documentElement.scrollTop;
   } else if (document.body) {// all other Explorers
       yScroll = document.body.scrollTop;
   }
   return yScroll;

} function setHeight(top) {

   // if (self.pageYOffset) {
   //     self.pageYOffset = Number(top);
   //     console.log(1)
   //     setMenu()
   // }
   if (document.documentElement) { // Explorer 6 Strict
       document.documentElement.scrollTop = Number(top);
       console.log(document.documentElement.scrollTop)
       setMenu()
   }
   else if (document.body) {// all other Explorers
       document.body.scrollTop = Number(top);
       console.log(3)
       setMenu()
   }

} function jump(num) {

   var h = document.getElementsByTagName("h2");
   for(var i=1;i<=h.length;i++)
   {
       if(i == num)
       {
           setHeight(h[i-1].offsetTop - 110)
           break;
       }
   }

} function toTop() {

   // console.log("aaa")
   setHeight(0);

} function resize(num) {

   var a = document.getElementById("detail")
   var b = document.getElementById("third-box")
   var leftLength = a.offsetLeft
   var sum = leftLength - 50 - num
   console.log(leftLength)
   b.style.display = "block"
   if (sum<0)
   {
       b.style.display = "none"
   }
   else{
       b.style.left = sum + "px"
   }

}