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Seamless image scrolling using Javascript

Source: Internet
Author: User
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Seamless image scrolling using Javascript

Effect: move the mouse over the image to stop scrolling. Move the mouse over the image to automatically scroll.

You can adjust to scroll left or right

 

The Code is as follows:


<Style type = "text/css">
*{
Margin: 0;
Padding: 0;
}
# Div1 {
Overflow: hidden;
Width: 712px;
Height: pixel PX;
Margin: 100px auto;
Position: relative;
Background: red;
}
# Div1 ul {
Position: absolute;
Left: 0;
Top: 0;
}
# Div1 ul li {
Float: left;
Width: 178px;
Height: pixel PX;
List-style: none;
}
</Style>

 

 

The Code is as follows:


<Body>
<A href = "javascript:;"> left </a>
<A href = "javascript:;"> right </a>
<Div id = "div1">
<Ul>
<Li>

</Li>
<Li>

</Li>
<Li>

</Li>
<Li>

</Li>
</Ul>
</Div>
</Body>

 

The above is a simple layout, and the following is the main Javascript code

 

The Code is as follows:


<Script type = "text/javascript">
Window. onload = function (){
Var oDiv = document. getElementById ("div1 ");
Var oUl = oDiv. getElementsByTagName ('ul ') [0];
Var aLi = oUl. getElementsByTagName ('lil ');
Var speed = 2;
OUl. innerHTML + = oUl. innerHTML;
OUl. style. width = aLi [0]. offsetWidth * aLi. length + 'px ';
Function move (){
If (oUl. offsetLeft <-oUl. offsetWidth/2 ){
OUl. style. left = '0 ';
}
If (oUl. offsetLeft> 0 ){
OUl. style. left =-oUl. offsetWidth/2 + 'px ';
}
OUl. style. left = oUl. offsetLeft + speed + 'px ';
}
Var timer = setInterval (move, 30 );
ODiv. onmouseover = function (){
ClearInterval (timer );
};
ODiv. onmouseout = function (){
Timer = setInterval (move, 30 );
};
Document. getElementsByTagName ('A') [0]. onclick = function (){
Speed =-2;
};
Document. getElementsByTagName ('A') [1]. onclick = function (){
Speed = 2;
};
}
</Script>

 

Briefly describe the following ideas:

First, set a total of eight oUl. innerHTML + = oUl. innerHTML images in ul;

When calculating the actual width of ul as li x 8

Then, hide the excess content.

Note: oUl. offsetLeft must be a negative value.

Therefore, do not miss the negative number during judgment.

 

The Code is as follows:


If (oUl. offsetLeft <-oUl. offsetWidth/2 ){
OUl. style. left = '0 ';

 

}

 

This section indicates that the image is rolled in half and the image is pulled back quickly. Because the program runs too fast, it is almost invisible to achieve seamless scrolling.

Finally, the variable speed is used to control the scrolling in the left and right directions.

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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