Issue with meta viewport on Android devices

Creating a versatile JavaScript dialog class is my current project using JQuery to generate centered div-popups on the screen. So far, implementation across common browsers has been straightforward.

The challenge arises when dealing with mobile platforms due to the discrepancies between the visible viewport (the user's current "viewing window" of the site) and the layout viewport (the CSS viewport representing the underlying page dimensions).

On iPhones, I have managed to address this issue by utilizing DOM properties such as window.innerWidth, window.innerHeight, pageXOffset, and pageYOffset to adjust centering based on scaling and panning.

// Calculating dialog width/height
var dx = $("#dialog").width(); 
var dy = $("#dialog").height();

// Determining window (layout viewport) width/height
var winW = $(window).width();
var winH = $(window).height();

if (window.innerWidth != winW) {
    // Handling zoomed-in or narrow browser windows
    var x = window.pageXOffset + (window.innerWidth - dx)/2;
} else {
    // Dealing with normal view
    var x = window.pageXOffset + (winW - dx)/2;
}

if (window.innerHeight != winH) {
    // Adjusting for zoom or limited height
    var y = window.pageYOffset + (window.innerHeight - dy)/2;
} else {
    // Centering in standard view
    var y = window.pageYOffset + (winH - dy)/2;
}

This positioning technique works effectively on most browsers including iPhones, but unfortunately, it fails on Android devices.

After extensive research using Google, it appears that Android exhibits challenges with the window.innerWidth and window.innerHeight properties (refer to http://www.quirksmode.org/mobile/viewports2.html, search for "Measuring the visible viewport").

An alternative approach could involve detecting Android browsers using the user-agent and consistently positioning the dialog at window.pageXOffset / window.pageYOffset. However, this solution is not ideal for various reasons, particularly the unattractive appearance when zoomed-out.

If anyone has insights on calculating the visible viewport on Android or has discovered a workaround for this issue, I would greatly appreciate your input.

Answer №1

Although this question has been around for a while, I have yet to come across a satisfying answer... Until now. After extensive testing on various Android devices, I believe I have finally discovered a clever workaround for the Android issue. Give this a try:

<!--HTML VERSION -->
<div id="sojernTest" style="position:absolute; top:0;bottom:0;left:0;right:0;display:none;"></div>

OR

// JAVASCRIPT WITH CSS CLASS
var div = document.createElement('div');
div.id = "screenSizeHolder";
div.className = "screen_size_holder";
document.body.insertBefore(div, document.body.firstChild);

$('#screenSizeHolder').html("&nbsp;");

Next, retrieve the size of that element

screenHeight = parseInt($('#screenSizeHolder').css('height').replace('px',''));
screenWidth = parseInt($('#screenSizeHolder').css('width').replace('px',''));

Answer №2

According to my findings, adjusting the viewport width to device-width is essential. This technique has proven effective across various Android versions I have experimented with (2.1, 2.2, and 2.3).

<meta name="viewport" content="width=device-width">

Answer №3

I have shared a significant amount of my findings on the topic of viewport and width problems here, which could be beneficial for you... Android browser WIDTH problem with web applications

Answer №4

My new approach is a unique solution that can be used across different platforms.

Visit this link for more details

This answer was also provided on another related question...

Learn how to set viewport meta for iPhone and handle rotation properly here

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