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Js simple click to return the top effect implementation method

Source: Internet
Author: User
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Js simple click to return the top effect implementation method

When the page is particularly long, you must scroll back to the top of the page several times before returning to the top. If there is a "Back to Top" button in the bottom right corner of the page, click, you can return to the top, which is a good experience for users.

Implementation principle: When the page is loaded, the element is located in the lower-right corner of the page. When the page is rolling, the element remains in the lower-right corner. When the user clicks, the page returns to the top.

Key Aspect 1: document.doc umentElement. clientWidth | document. body. clientWidth; obtain the width of the visible area. Chrome compatibility is followed by compatibility with other browsers.

Key Aspect 2: oTop. style. left = screenw-oTop. offsetWidth + "px"; when loading a page, place the element on the rightmost side of the page, and subtract the width of the element from the visible area.

Key Aspect 3: oTop. style. top = screenh-oTop. offsetHeight + scrolltop + "px"; when the page is rolling, the Y coordinate position of the element is equal to the height of the visible area minus the height of the element, plus the scroll distance.

Key Aspect 4: document.doc umentElement. scrollTop = document. body. scrollTop = 0. When you click an element, set the page scroll distance to 0. Write the two to ensure compatibility.

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<! DOCTYPE html>

<Html>

<Head>

<Meta charset = "UTF-8"/>

<Title> untitled document </title>

<Style>

Body {margin: 0; padding: 0}

# To_top {width: 30px; height: 40px; padding: 20px; font: 14px/20px arial; text-align: center; background: # 06c; position: absolute; cursor: pointer; color: # fff}

</Style>

<Script>

Window. onload = function (){

Var oTop = document. getElementById ("to_top ");

Var screenw = document.doc umentElement. clientWidth | document. body. clientWidth;

Var screenh = document.doc umentElement. clientHeight | document. body. clientHeight;

OTop. style. left = screenw-oTop. offsetWidth + "px ";

OTop. style. top = screenh-oTop. offsetHeight + "px ";

Window. onscroll = function (){

Var scrolltop = document.doc umentElement. scrollTop | document. body. scrollTop;

OTop. style. top = screenh-oTop. offsetHeight + scrolltop + "px ";

}

OTop. onclick = function (){

Document.doc umentElement. scrollTop = document. body. scrollTop = 0;

}

}

</Script>

</Head>

<Body style = "height: 1000px;">

<H1> Back to Top

<Div id = "to_top"> return to the top </div>

</Body>

</Html>

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