我们如何通过javascript窗口打开一个弹出窗口的中心。打开功能上的屏幕中心变量，以当前选择的屏幕分辨率?
当前回答
你可以使用css来做到这一点，只要给元素下面的属性被放置在弹出窗口的中心
element{
position:fixed;
left: 50%;
top: 50%;
-ms-transform: translate(-50%,-50%);
-moz-transform:translate(-50%,-50%);
-webkit-transform: translate(-50%,-50%);
transform: translate(-50%,-50%);
}
其他回答
由于在多显示器设置中确定当前屏幕中心的复杂性，一个更简单的选择是将弹出窗口置于父窗口的中央。简单地将父窗口作为另一个参数传递:
function popupWindow(url, windowName, win, w, h) {
const y = win.top.outerHeight / 2 + win.top.screenY - ( h / 2);
const x = win.top.outerWidth / 2 + win.top.screenX - ( w / 2);
return win.open(url, windowName, `toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=no, resizable=no, copyhistory=no, width=${w}, height=${h}, top=${y}, left=${x}`);
}
实现:
popupWindow('google.com', 'test', window, 200, 100);
基于Facebook的，但使用媒体查询而不是用户代理正则表达式来计算是否有足够的空间(有一些空间)弹出窗口，否则将全屏。不管怎样，Tbh在移动设备上弹出的窗口会作为新标签打开。
function popupCenter(url, title, w, h) {
const hasSpace = window.matchMedia(`(min-width: ${w + 20}px) and (min-height: ${h + 20}px)`).matches;
const isDef = v => typeof v !== 'undefined';
const screenX = isDef(window.screenX) ? window.screenX : window.screenLeft;
const screenY = isDef(window.screenY) ? window.screenY : window.screenTop;
const outerWidth = isDef(window.outerWidth) ? window.outerWidth : document.documentElement.clientWidth;
const outerHeight = isDef(window.outerHeight) ? window.outerHeight : document.documentElement.clientHeight - 22;
const targetWidth = hasSpace ? w : null;
const targetHeight = hasSpace ? h : null;
const V = screenX < 0 ? window.screen.width + screenX : screenX;
const left = parseInt(V + (outerWidth - targetWidth) / 2, 10);
const right = parseInt(screenY + (outerHeight - targetHeight) / 2.5, 10);
const features = [];
if (targetWidth !== null) {
features.push(`width=${targetWidth}`);
}
if (targetHeight !== null) {
features.push(`height=${targetHeight}`);
}
features.push(`left=${left}`);
features.push(`top=${right}`);
features.push('scrollbars=1');
const newWindow = window.open(url, title, features.join(','));
if (window.focus) {
newWindow.focus();
}
return newWindow;
}
我的建议是将剩余空间的33%或25%用于顶部位置，而不是像这里发布的其他示例那样使用50%， 主要是因为窗口头文件， 看起来更好，更舒适，
完整的代码:
<script language="javascript" type="text/javascript">
function OpenPopupCenter(pageURL, title, w, h) {
var left = (screen.width - w) / 2;
var top = (screen.height - h) / 4; // for 25% - devide by 4 | for 33% - devide by 3
var targetWin = window.open(pageURL, title, 'toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=no, resizable=no, copyhistory=no, width=' + w + ', height=' + h + ', top=' + top + ', left=' + left);
}
</script>
</head>
<body>
<button onclick="OpenPopupCenter('http://www.google.com', 'TEST!?', 800, 600);">click on me</button>
</body>
</html>
看看这句话: Var top =(屏幕。高度- h) / 4;| for 33% -除以3
单/双监视器功能(credit to http://www.xtf.dk -谢谢!)
更新:它也将工作在窗口，没有最大的屏幕的宽度和高度现在感谢@霜!
如果你使用双显示器，窗口将水平居中，而不是垂直居中…使用这个函数来解释这一点。
const popupCenter = ({url, title, w, h}) => {
// Fixes dual-screen position Most browsers Firefox
const dualScreenLeft = window.screenLeft !== undefined ? window.screenLeft : window.screenX;
const dualScreenTop = window.screenTop !== undefined ? window.screenTop : window.screenY;
const width = window.innerWidth ? window.innerWidth : document.documentElement.clientWidth ? document.documentElement.clientWidth : screen.width;
const height = window.innerHeight ? window.innerHeight : document.documentElement.clientHeight ? document.documentElement.clientHeight : screen.height;
const systemZoom = width / window.screen.availWidth;
const left = (width - w) / 2 / systemZoom + dualScreenLeft
const top = (height - h) / 2 / systemZoom + dualScreenTop
const newWindow = window.open(url, title,
`
scrollbars=yes,
width=${w / systemZoom},
height=${h / systemZoom},
top=${top},
left=${left}
`
)
if (window.focus) newWindow.focus();
}
使用的例子:
popupCenter({url: 'http://www.xtf.dk', title: 'xtf', w: 900, h: 500});
信用流向:http://www.xtf.dk/2011/08/center-new-popup-window-even-on.html(我想链接到这个页面，但以防这个网站宕机，代码在这里SO。)
(这是在2020年发布的)
这是CrazyTim回答的延伸
还可以将宽度设置为动态大小的百分比(或比率)。 绝对尺寸仍然被接受。
function popupWindow(url, title, w='75%', h='16:9', opts){
// sort options
let options = [];
if(typeof opts === 'object'){
Object.keys(opts).forEach(function(value, key){
if(value === true){value = 'yes';}else if(value === false){value = 'no';}
options.push(`${key}=${value}`);
});
if(options.length){options = ','+options.join(',');}
else{options = '';}
}else if(Array.isArray(opts)){
options = ','+opts.join(',');
}else if(typeof opts === 'string'){
options = ','+opts;
}else{options = '';}
// add most vars to local object (to shorten names)
let size = {w: w, h: h};
let win = {w: {i: window.top.innerWidth, o: window.top.outerWidth}, h: {i: window.top.innerHeight, o: window.top.outerHeight}, x: window.top.screenX || window.top.screenLeft, y: window.top.screenY || window.top.screenTop}
// set window size if percent
if(typeof size.w === 'string' && size.w.endsWith('%')){size.w = Number(size.w.replace(/%$/, ''))*win.w.o/100;}
if(typeof size.h === 'string' && size.h.endsWith('%')){size.h = Number(size.h.replace(/%$/, ''))*win.h.o/100;}
// set window size if ratio
if(typeof size.w === 'string' && size.w.includes(':')){
size.w = size.w.split(':', 2);
if(win.w.o < win.h.o){
// if height is bigger than width, reverse ratio
size.w = Number(size.h)*Number(size.w[1])/Number(size.w[0]);
}else{size.w = Number(size.h)*Number(size.w[0])/Number(size.w[1]);}
}
if(typeof size.h === 'string' && size.h.includes(':')){
size.h = size.h.split(':', 2);
if(win.w.o < win.h.o){
// if height is bigger than width, reverse ratio
size.h = Number(size.w)*Number(size.h[0])/Number(size.h[1]);
}else{size.h = Number(size.w)*Number(size.h[1])/Number(size.h[0]);}
}
// force window size to type number
if(typeof size.w === 'string'){size.w = Number(size.w);}
if(typeof size.h === 'string'){size.h = Number(size.h);}
// keep popup window within padding of window size
if(size.w > win.w.i-50){size.w = win.w.i-50;}
if(size.h > win.h.i-50){size.h = win.h.i-50;}
// do math
const x = win.w.o / 2 + win.x - (size.w / 2);
const y = win.h.o / 2 + win.y - (size.h / 2);
return window.open(url, title, `width=${size.w},height=${size.h},left=${x},top=${y}${options}`);
}
用法:
// width and height are optional (defaults: width = '75%' height = '16:9')
popupWindow('https://www.google.com', 'Title', '75%', '16:9', {/* options (optional) */});
// options can be an object, array, or string
// example: object (only in object, true/false get replaced with 'yes'/'no')
const options = {scrollbars: false, resizable: true};
// example: array
const options = ['scrollbars=no', 'resizable=yes'];
// example: string (same as window.open() string)
const options = 'scrollbars=no,resizable=yes';
