我如何去设置一个<div>在屏幕的中心使用jQuery?
当前回答
请使用这个:
$(window).resize(function(){
$('.className').css({
position:'absolute',
left: ($(window).width() - $('.className').outerWidth())/2,
top: ($(window).height() - $('.className').outerHeight())/2
});
});
// To initially run the function:
$(window).resize();
其他回答
我喜欢添加函数到jQuery,所以这个函数会有帮助:
jQuery.fn.center = function () {
this.css("position","absolute");
this.css("top", Math.max(0, (($(window).height() - $(this).outerHeight()) / 2) +
$(window).scrollTop()) + "px");
this.css("left", Math.max(0, (($(window).width() - $(this).outerWidth()) / 2) +
$(window).scrollLeft()) + "px");
return this;
}
现在我们可以写成:
$(element).center();
演示:小提琴(添加参数)
通常,我只会用CSS做这个…但是既然你问你一个方法来做这个用jQuery…
下面的代码将一个div在其容器内水平和垂直地居中:
$("#target").addClass("centered-content") .wrap("<div class='center-outer-container'></div>") .wrap("<div class='center-inner-container'></div>"); body { margin : 0; background: #ccc; } .center-outer-container { position : absolute; display: table; width: 100%; height: 100%; } .center-inner-container { display: table-cell; vertical-align: middle; text-align: center; } .centered-content { display: inline-block; text-align: left; background: #fff; padding : 20px; border : 1px solid #000; } <script type="text/javascript" src="https://code.jquery.com/jquery-1.12.1.min.js"></script> <div id="target">Center this!</div>
(也可以参看这把小提琴)
我用这个:
$(function() {
$('#divId').css({
'left' : '50%',
'top' : '50%',
'position' : 'absolute',
'margin-left' : -$('#divId').outerWidth()/2,
'margin-top' : -$('#divId').outerHeight()/2
});
});
你可以使用CSS translate属性:
position: absolute;
transform: translate(-50%, -50%);
阅读这篇文章了解更多细节。
我在扩展@TonyL给出的精彩答案。我添加了Math.abs()来包装值,而且我还考虑到jQuery可能处于“无冲突”模式,例如在WordPress中。
I recommend that you wrap the top and left values with Math.abs() as I have done below. If the window is too small, and your modal dialog has a close box at the top, this will prevent the problem of not seeing the close box. Tony's function would have had potentially negative values. A good example on how you end up with negative values is if you have a large centered dialog but the end user has installed several toolbars and/or increased his default font -- in such a case, the close box on a modal dialog (if at the top) might not be visible and clickable.
我做的另一件事是通过缓存$(window)对象来加快速度,这样我就减少了额外的DOM遍历,并且我使用了集群CSS。
jQuery.fn.center = function ($) {
var w = $(window);
this.css({
'position':'absolute',
'top':Math.abs(((w.height() - this.outerHeight()) / 2) + w.scrollTop()),
'left':Math.abs(((w.width() - this.outerWidth()) / 2) + w.scrollLeft())
});
return this;
}
要使用,你可以这样做:
jQuery(document).ready(function($){
$('#myelem').center();
});