One, with CSS to make the div layer horizontally centered
Add the following properties to the DIV layer that needs to be centered horizontally:
Margin-left:auto;
Margin-right:auto;
This is already centered in FF, but in IE is not centered!
The problem is not in CSS but in the XHTML page itself.
You need to add such a code to make the above settings effective:
<! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">
How do I make a div centered
The main style definitions are as follows:
body {text-align:center;}
#center {Margin-right:auto; Margin-left:auto; }
Description
First, the parent element defines text-align:center, which means that the content within the parent element is centered, and for IE this setting is OK. But you can't center in Mozilla. The solution is to add "Margin-right:auto" when the child element definition is set; Margin-left:auto; ”
What needs to be explained is that if you want to use this method to make the entire page centered, it is recommended not to be nested in a div, you can split out a number of Div, as long as in each split div defined margin-right:auto; Margin-left:auto; It's OK.
How do I get a picture centered vertically in a div
Use the background method. Example:
body{Background:url (background image path) #FFF No-repeat Center;
The key is the final center, which defines the location of the picture. It can also be written as "top left" or "bottom right", or you can write the value "50 30" directly.
How do I align text vertically in a div
The result is the text, you can not use the background method, the way to increase the line spacing to achieve vertical center, complete code as follows:
<style>
body{Text-align:center;}
#center {Margin-right:auto;
Margin-left:auto;
height:200px;
Background: #F00;
width:400px;
Vertical-align:middle;
line-height:200px;
}
</style>
<body>
<div id= "center" ><p>test content</p></div>
</body>
Description
Vertical-align:middle indicates that the line is centered vertically, we increase the spacing to be as high as the entire Div line-height:200px, and then insert the text and center it vertically.
Css+div Control page Elements Vertically center code global and area vertically
<style type= "Text/css" media=screen>
Body
{
Text-align:center;
}
#a
{
width:200px;
height:400px;
Background: #000;
}
#b
{
Margin-top:expression ((A.CLIENTHEIGHT-50)/2);
width:50px;
height:50px;
Background: #FFF;
}
#c
{
Position:absolute;
Left:expression ((BODY.CLIENTWIDTH-50)/2);
Top:expression ((BODY.CLIENTHEIGHT-50)/2);
width:50px;
height:50px;
Background: #F00;
}
</style>
<div id= "a" >
<div id= "B" ></div>
</div>
<div id= "C" ></div>
Another method:
<div style= "Background:blue;position:absolute;left:expression ((BODY.CLIENTWIDTH-50)/2); Top:expression ( BODY.CLIENTHEIGHT-50)/2); width:50;height:50 "></div>
***************************************
Second, use JS to center the layer
Add the following code to the <body> area
<div id=l1 style= "HEIGHT:107PX; left:341px; Position:absolute; top:585px; width:205px; Z-index:1 ">
<table bgcolor= #ffffff border=1 bordercolordark= #ffffff bordercolorlight= #000000 cellpadding=0 cellspacing=0 width = "100%" >
<TR>
<TD height=1 width=178> Web Teaching Network </TD>
<TD Align=middle
Style= "Cursor:hand" width=21>х</td></tr>
<tr valign=top>
<TD colspan=2
Height=91> Welcome to this site!<br><br> site domain name: <br><a href= "http://www.webjx.com" target= "_blank" >http ://www.webjx.com</a>
</TD></TR></TABLE></DIV>
<script language= "JavaScript" >
function Moveit ()//is used to put the layer in the middle of the browser
{
L1.style.left= ((Document.body.offsetwidth-parsefloat (L1.style.width))/2 +document.body.scrollleft;
L1.style.top= ((Document.body.offsetheight-parsefloat (L1.style.height))/2 +document.body.scrolltop;
}
Window.onload=moveit; Perform Moveit () when the network surface is open
Window.onresize=moveit; Perform Moveit when resizing browser ()
Window.onscroll=moveit; Executes Moveit when pulling scroll bars ()
</SCRIPT>
Third, centering with positioning method
<div style= "background: #f00; width:740px; height:340px; left:50%; margin:0px 0 0-370px; Position:absolute; " >
Explanation: This method was only known before, but once a friend asked me the principle of the method, then I did not answer, a few days ago read an article suddenly understand its principle! Before my understanding is first left boundary -370px, then is wants position question, therefore always thinks impassability. In fact, we can go back and try to locate the back border, so it's easy to understand. Position:absolute, it is positioned on the browser, left:50%, right in the middle of the position, that is, the left edge of this div block in the middle of the viewer, in the join style margin-left:-370px, this 370 is calculated, It happens to be half of div740, we let Div go back 370, so the Div line and the center of the browser line coincide so see the div is always in the middle! The disadvantage of this approach is that if your browser is less than width, it is not a pleasant thing for you!
Process please look at the following figure:
Add the difference between left and Margin-left:
Left this property is only available when the object's positioning (position) property is set. Otherwise, this property setting is ignored.
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