CODEWITHSUNDEEP
javascriptjqueryhtmlcssjquery-ui
chemitaxis
chemitaxis

Reputation: 14927

jQuery Drag with CSS Transform with jQuery UI

I am trying to scale an element and drag this element to do a WorkSpace that can work in all screen resolutions.

The problem I have it that I can't do it works fine. If you try the Fiddle Code you can see that the elements that is being resized doesn't going to the final corner. I have read a lot of post like this (jQuery Drag/Resize with CSS Transform Scale) but the problem is when you reference a containment.

The fiddle code with the error example:

http://jsfiddle.net/yeD4b/4/

Updated: added text too

HTML

<div id="containerDragable">
<img id="img_messi" style="display: inline; position: absolute; z-index: 101; " src="http://www.elconfidencial.com/fotos/noticias_2011/2012090245messi_dentro.jpg" />

<div id="text_example">hi!</div>

CSS

  #containerDragable {
    width: 80vw; 
    height: 45vw;
    background-color: rgb(227, 227, 227);
    margin: auto;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    position:absolute;
}

#img_messi
{
    -webkit-transform-origin: 0 0;
    -moz-transform-origin: 0 0;
    -ms-transform-origin: 0 0;
    -o-transform-origin: 0 0;
    transform-origin: 0 0;   
    -webkit-transform: scale(0.5);
    position:absolute;
}
#text_example
{
    font: normal 36px arial,sans-serif;
    position:absolute;
    -webkit-transform-origin: 0 0;
    -moz-transform-origin: 0 0;
    -ms-transform-origin: 0 0;
    -o-transform-origin: 0 0;
    transform-origin: 0 0;   
    -webkit-transform: scale(0.5);
}

JavaScript

$(function () {
        $('#img_messi').draggable({
            containment: "#containerDragable", cursor: "move", scroll: false

        });
    });

$(function () {
        $('#text_example').draggable({
            containment: "#containerDragable", cursor: "move", scroll: false

        });
    });

Thanks!!

Upvotes: 0

Views: 1034

Answers (1)

Brewal
Brewal

Reputation: 8199

Don't use CSS to scale your image. Use jQuery instead :

Demo jsFiddle

$('#img_messi').width($('#img_messi').width()/2);

Edit :

To fit better to your needs, if you have to use the scale css property, you should use this simple workaround with negatives margins :

Demo jsFiddle

$(this).css('margin', '0 -'+($(this).width()/2)+'px -'+($(this).height()/2)+'px 0');

That's quite ugly yet it works...

Edit : with dynamic ratio

Ok this is a tough one... The main trick here is to set the margin to top, right, bottom and left.

The demo

See this : 

var verticalOffset = ($(this).height() - $(this).height()*ratio)*0.5;
var horizontalOffset = ($(this).width() - $(this).width()*ratio)*0.5;

Here $(this).height() is the original height of the DOM (same for width). You substract to this itself times the ratio, and then divide the whole by 2 (*0.5) because the margins are on top and bottom (same for left and right).

Upvotes: 2

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