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Ceiling BAR + large image loading and scrolling

Source: Internet
Author: User
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<! Doctype HTML>
<HTML>
<Head>
<Meta charset = "UTF-8">
<Title> untitled document </title>
<Style>
* {Margin: 0; padding: 0 ;}
. Box {position: relative; padding: 50px; border-bottom: 1px solid red ;}
. Box IMG {display: block; width: pixel PX; Height: 800px ;}
</Style>
<SCRIPT>
Window. onload = function ()
{
VaR aimg = Document. getelementsbytagname ('img ');


//
// The first screen
VaR winhsf-document.doc umentelement. clientheight;
For (VAR I = 0; I <aimg. length; I ++)
{
Aimg [I]. _ Top = getpos (aimg [I]). Top;
If (aimg [I]. _ top <winh)
{

Aimg [I]. src = aimg [I]. getattribute ('_ src ');
Aimg [I]. B = true; // switched
};
};
VaR obox1 = Document. getelementbyid ('box1 ');
VaR obox2 = Document. getelementbyid ('box2 ');
VaR Top = getpos (obox1). Top;

Window. onscroll = function ()
{Var scrolltop = Document. Body. scrolltop | document.doc umentelement. scrolltop;
VaR winhsf-document.doc umentelement. clientheight;
{For (VAR I = 0; I <aimg. length; I ++)
{

If (aimg [I]. B) continue;

If (aimg [I]. _ top <= winh + scrolltop)
{

// Aimg [I]. src = aimg [I]. getattribute ('_ src ');

(
Function (INDEX ){
VaR oimg = new image ();
Oimg. onload = function ()
{
Aimg [Index]. src = This. SRC;
};
Oimg. src = aimg [I]. getattribute ('_ src ');
}) (I );

Aimg [I]. B = true;
};
If (scrolltop> = top)
{
Obox1.style. Position = 'fixed ';
Obox1.style. Left = 0;
Obox1.style. Top = 0;
Obox2.style. Display = "Block ";
}
Else
{
Obox1.style. Position = "";
Obox2.style. Display = "NONE ";
};

 

};
};
};
};

 

Function getpos (OBJ)
{
VaR L = 0;
VaR T = 0;
While (OBJ)
{
L + = obj. offsetleft;
T + = obj. offsettop;
OBJ = obj. offsetparent;
};

Return {left: l, top: t };
};

</SCRIPT>
</Head>

<Body>
<Div class = "box">

</Div>

<Div class = "box">

</Div>

<Div class = "box">
<P> </P>
</Div>

<Div id = "box1" style = "display: block; Right: 0; width: 100%; padding: 10px; text-align: center; font-weight: bold; Background: # CCC; Z-index: 5555; ">
The body and soul are always on the road... </Div>
<Div style = "height: 120px; display: none;" id = "box2"> </div>
</Div>

<Div class = "box">

</Div>

<Div class = "box">

</Div>

<Div class = "box">

</Div>

<Div class = "box">

</Div>

<Div class = "box">

</Div>
</Body>
</Html>

Ceiling BAR + large image loading and scrolling

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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