Go Premium for a chance to win a PS4. Enter to Win


jQuery Mapster Resize: How to always fill document body + vertical center

Posted on 2014-01-30
Medium Priority
Last Modified: 2014-02-04
Hi experts!

Quiet challenging problem I have.

I'm using this jQuery mapster for custom styled HTML image maps:

Along with this nice tweak that makes it responsive:

The problem:
It works fine, adapts to the window width and height, but I'd like to get it:

1. To always fill the browser window, no matter what width/height ratio is it (currently it leaves grey border if width lower than height value and vice versa)
2. At the same time to be always vertically centered

Here's my JSfiddle: http://jsfiddle.net/Aidam/DHSL8/7/

Any working suggestion would be highly appreciated!

Thank you
Question by:Aidam-11
  • 4
  • 2
LVL 54

Expert Comment

by:Scott Fell, EE MVE
ID: 39820458
>1. To always fill the browser window, no matter what width/height ratio is it (currently it leaves grey border if width lower than height value and vice versa)

The image is staying in proportion.  If the browser is narrowed as far as it can go and the height is the full width of the screen are you saying you want an image that is going to look out of proportion just to fill up the screen?

>2. At the same time to be always vertically centered
It did not seem vertically centered in jsfiddle but it does look fine in jsbin http://jsbin.com/ogEdOmek/1/

Add below code to resize vertically  http://jsbin.com/ogEdOmek/3/
var h = $(this).height();
$( window ).resize(function() {
   h = $(this).height();

Open in new window


Author Comment

ID: 39821753
Thank but this is not working for me.

Basically what I'm trying to achieve is exactly this behaviour:


Any ideas?
LVL 54

Expert Comment

by:Scott Fell, EE MVE
ID: 39822500
I found a fiddle that seems to do it.  The example I gave was very basic.  

var resizeTime = 100;     // total duration of the resize effect, 0 is instant
var resizeDelay = 100;    // time to wait before checking the window size again
                          // the shorter the time, the more reactive it will be.
                          // short or 0 times could cause problems with old browsers.
    mapKey: 'state'

// Resize the map to fit within the boundaries provided

function resize(maxWidth,maxHeight) {
     var image =  $('img'),
        imgWidth = image.width(),
        imgHeight = image.height(),

    if (imgWidth/maxWidth>imgHeight/maxHeight) {
        newWidth = maxWidth;
    } else {
        newHeight = maxHeight;

// Track window resizing events, but only actually call the map resize when the
// window isn't being resized any more

function onWindowResize() {
    var curWidth = $(window).width(),
        curHeight = $(window).height(),
    if (checking) {
    checking = true;
    window.setTimeout(function() {
        var newWidth = $(window).width(),
           newHeight = $(window).height();
        if (newWidth === curWidth &&
            newHeight === curHeight) {
    },resizeDelay );


Open in new window

Concerto's Cloud Advisory Services

Want to avoid the missteps to gaining all the benefits of the cloud? Learn more about the different assessment options from our Cloud Advisory team.


Author Comment

ID: 39822693
This fiddle you gave me it's the code I'm already building on.

Again, I need the image map to behave like this - to always fill the entire body: http://jsfiddle.net/panchroma/gXGcD/
LVL 54

Expert Comment

by:Scott Fell, EE MVE
ID: 39822718
Let's see if somebody else as a better idea.  I have only seen that done as a background image.
LVL 35

Accepted Solution

Robert Schutt earned 2000 total points
ID: 39829951
The trouble with that background image is that instead of the grey bits on the side, you will now be missing parts of the image, but if you want to keep it proportional, that can't be helped. I updated your fiddle: http://jsfiddle.net/DHSL8/8/

The changes are to check for width/height ratio the other way around and set a negative offset for the top/left whichever is not the max.

I'm afraid there is a rather nasty timing problem but I haven't been able to put my finger on it yet. Sometimes the image is shown on a wrong offset after a sudden move it seems.

The changed code:
    // Resize the map to fit within the boundaries provided

// UPDATE: fit map "outside" window and center it
// TODO: resolve timing issues which cause the map to snap out of place after sudden movement

    function resize(maxWidth, maxHeight) {
        var image = $('img'),
            imgWidth = image.width(),
            imgHeight = image.height(),
            newWidth = 0,
            newHeight = 0;

        if (imgWidth / maxWidth < imgHeight / maxHeight) {
            newWidth = maxWidth;
            image.closest('div').delay(resizeTime).animate({ left: 0, top: Math.floor((maxHeight-imgHeight)/2) },resizeTime);
        } else {
            newHeight = maxHeight;
            image.closest('div').delay(resizeTime).animate({ left: Math.floor((maxWidth-imgWidth)/2), top: 0 },resizeTime);
        image.mapster('resize', newWidth, newHeight, resizeTime);

Open in new window

LVL 54

Expert Comment

by:Scott Fell, EE MVE
ID: 39830628
I just had to do something very similar on one  of my own projects.  This seemed to work at least for a background image.
body {
background:url('http://kb.adamhusar.com/wp-content/themes/kp/img/map.jpg') no-repeat center center fixed;
-webkit-background-size: cover;
-moz-background-size: cover;
background-size: cover;

<meta charset=utf-8 />


Open in new window

I don't know how that translates to an image map though.

I wonder if it would be best to just use media queries to size the image and not use js/jquery.  It may still be a bit jerky going from one size to the next, but I think most users open up the browser and view it in one size (especially if phone/tablet) and if on desktop, maybe slide to smaller or larger once.

Featured Post

Vote for the Most Valuable Expert

It’s time to recognize experts that go above and beyond with helpful solutions and engagement on site. Choose from the top experts in the Hall of Fame or on the right rail of your favorite topic page. Look for the blue “Nominate” button on their profile to vote.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Find out what you should include to make the best professional email signature for your organization.
Without even knowing it, most of us are using web applications on a daily basis.  In fact, Gmail and Yahoo email, Twitter, Facebook, and eBay are used by most of us daily—and they are web applications. We generally confuse these web applications to…
Learn how to create flexible layouts using relative units in CSS.  New relative units added in CSS3 include vw(viewports width), vh(viewports height), vmin(minimum of viewports height and width), and vmax (maximum of viewports height and width).
This video shows how to quickly and easily deploy an email signature for all users in Office 365 and prevent it from being added to replies and forwards. (the resulting signature is applied on the server level in Exchange Online) The email signat…
Suggested Courses

885 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question