Center a popup window on screen?

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How can we center a popup window opened via javascript window.open function on the center of screen variable to the currently selected screen resolution ?

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温柔的废话

2020-11-22 17:27

.center{
    left: 50%;
    max-width: 350px;
    padding: 15px;
    text-align:center;
    position: relative;
    transform: translateX(-50%);
    -moz-transform: translateX(-50%);
    -webkit-transform: translateX(-50%);
    -ms-transform: translateX(-50%);
    -o-transform: translateX(-50%);   
}

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后悔当初

2020-11-22 17:29

try it like this:

function popupwindow(url, title, w, h) {
  var left = (screen.width/2)-(w/2);
  var top = (screen.height/2)-(h/2);
  return window.open(url, 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);
}

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有刺的猬

2020-11-22 17:32

(this was posted in 2020)

An extension to CrazyTim's answer

You can also set the width to a percentage (or a ratio) for a dynamic size. Absolute size is still accepted.

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}`);
}

usage:

// 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';

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鱼传尺愫

2020-11-22 17:32

This would work out based on your screen size

<html>
<body>
<button onclick="openfunc()">Click here to open window at center</button>
<script>
function openfunc() {
windowWidth = 800;
windowHeight = 720;
 var left = (screen.width - windowWidth) / 2;
            var top = (screen.height - windowHeight) / 4;
            var myWindow = window.open("https://www.google.com",'_blank','width=' + windowWidth + ', height=' + windowHeight + ', top=' + top + ', left=' + left);
}
</script>
</body>
</html>

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温柔的废话

2020-11-22 17:35

Due to the complexity of determining the center of the current screen in a multi-monitor setup, an easier option is to center the pop-up over the parent window. Simply pass the parent window as another parameter:

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}`);
}

Implementation:

popupWindow('google.com', 'test', window, 200, 100);

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时光说笑

2020-11-22 17:35

Source: http://www.nigraphic.com/blog/java-script/how-open-new-window-popup-center-screen

function PopupCenter(pageURL, title,w,h) {
  var left = (screen.width/2)-(w/2);
  var top = (screen.height/2)-(h/2);
  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);
  return targetWin;
}

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