2017-01-03 113 views
0

我正在學習JavaScript,因此我決定在整個過程中創建一個頁面網站。我想在頁面中實現平滑滾動,但即使代碼顯得乾淨而正確,它也不起作用。我需要幫助解決這個問題。使用JavaScript平滑滾動問題

基本上發生了什麼事情是,當我點擊導航欄中的鏈接將我拉下目標頁面時,它根本不滾動,甚至無法執行任何操作。而且,當我點擊一個鏈接後試圖正常滾動它時,滾動抖動並且不讓我繼續滾動。

我已經檢查了調試器的錯誤,並且根據調試器沒有錯誤(至少沒有語法錯誤)。

我該如何找到問題以及如何解決?

下面是JavaScript代碼:

var targetDistance = 0; 
var distanceScrolled = 0; 
var bodyHeight = 0; 
var Ydistance = 0; 
var marginY = 0; 
var speed = 55; 
var tempDist = 24; 


function smoothScroll(el) { 
targetDistance = document.getElementsByClassName(el).offsetTop; //Target distance to scroll from current element 
distanceScrolled = window.pageYOffset;        //Distance scrolled from current element to target element 
bodyHeight = document.body.offsetHeight;       //Maximum distance of the body to scroll from the current element 
Ydistance = distanceScrolled + window.innerHeight;     //Total distance scrolled from the current element to the bottom 

var setScroll = setTimeout(function(){ 
    smoothScroll(el); 
}, 1); 


//Stop Scrolling when it hits bottom of the page 
if (Ydistance >=bodyHeight) { 
    clearTimeout(setScroll); 
} 

//Scroll if the distance scrolled is less than the target distance 
else if(distanceScrolled < targetDistance - 24) { 
    var distToScroll = distanceScrolled + 24; 
    window.scroll(0, distToScroll); 

} 

//stop when the distance scrolled equals or is greater than the target distance 
else { 
window.scroll(0, distToScroll); 
} 
} 

,如果你們需要的HTML5代碼,那就是:

<!doctype html> 
<html lang="en"> 
<head> 
    <title>Smooth Scrolling</title> 
    <meta charset="UTF-8"> 
    <meta name="viewport" content="width=device-width, initial-scale=1.0" > 
    <link type="text/css" rel="stylesheet" href="style.css"> 
</head> 

<body> 

    <div id="allPages" class="Page1"> 
     <div class="navBar"> 
     <nav> 
      <ul> 
       <li><a href="#" onclick="smoothScroll('Page4'); return false;">Contacts</a></li> 
       <li><a href="#" onclick="smoothScroll('Page3'); return false;">Portfolio</a></li> 
       <li><a href="#" onclick="smoothScroll('Page2'); return false;">About Me</a></li> 
       <li><a href="#" onclick="smoothScroll('Page1'); return false;">Home</a></li> 
      </ul> 
     </nav> 
     </div> 
    </div> 

    <div id="allPages" class="Page2"> 

    </div> 

    <div id="allPages" class="Page3"> 

    </div> 

    <div id="allPages" class="Page4"> 

    </div> 


    <script type="text/javascript" src="script.js"></script> 
</body> 

如果您還需要CSS代碼,在這裏它是:

*{ 
box-sizing: border-box; 
margin: 0; 
padding: 0; 
font-family: monospace; 
font-size: 18px; 
} 



.body { 
height: 100%; 
} 

.navBar { 
margin-top: 2%; 
} 
.Page1 { 
height: 100vh; 
} 

.Page1 ul { 
list-style: none; 
margin-right: 10%; 
margin-left: 65%; 
} 

.Page1 ul a { 
float: right; 
text-decoration: none; 
padding: 15px; 
color: black; 
font-weight: bold; 
} 

.Page1 ul a:hover { 
background-color: #D91E18; 
color: white; 
} 



.Page2 { 
height: 100vh; 
background-color: #DADFE1; 
} 

.Page3 { 
height: 100vh; 
background-color: #DADFE1; 
} 

.Page4 { 
height: 100vh; 
background-color: #DADFE1; 
} 
+0

嗨,我解決了getElementByClassname問題,但它只解決了部分問題。當我點擊按鈕向下滾動時,它會無限滾動。所以,我認爲getElementByClassName不是唯一的問題。你可以請,重新打開這個問題,並幫助我解決這個問題。在此先感謝 – einacio

+0

沒關係,我解決了其他問題 – einacio

回答

0

你需要修改你的代碼一點點:

targetDistance = document.getElementsByClassName(el).offsetTop; 

變爲:

targetDistance = document.getElementsByClassName(el)[0].offsetTop; 

getElementsByClassName方法返回一個數組。

+0

好吧,我做到了,但現在它滾動了一下,但滾動無限地上下滾動。對此也有幫助嗎?謝謝 – einacio

+0

沒關係,我解決了另一個問題。謝謝 – einacio