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scaling images

Posted on 2011-09-23
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Last Modified: 2012-05-12
Can jQuery scale in image to size of the containing div?
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Question by:knowlton
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Assisted Solution

by:Frosty555
Frosty555 earned 250 total points
ID: 36590088
If your image is in an IMG tag you can set the width and height of the img to the width and height of your DIV. You'd use the jquery "width()" and "height()" functions:

http://api.jquery.com/width/
http://api.jquery.com/height/
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Expert Comment

by:HainKurt
ID: 36590207
no need for jQuery


<img src="http://indianahumanities.net/wp-content/uploads/2011/08/cat2.jpg">

<div style="width:300;height:200">
<img src="http://indianahumanities.net/wp-content/uploads/2011/08/cat2.jpg" style="width:100%;height:100%">
</div>

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Author Comment

by:knowlton
ID: 36590208
Can you give an example?
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LVL 51

Expert Comment

by:HainKurt
ID: 36590222
scale means, preserve the ratio?
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Expert Comment

by:HainKurt
ID: 36590389
I made this sample:

hope you find it useful
<html>
<head>
			<script src="http://code.jquery.com/jquery-latest.min.js" type="text/javascript" ></script>

<script>
$(document).ready(function() {
  $(".divImg img").each(function(index){

  //alert($(this).src + " : " + this.width + " - "+ this.height);

  var d = $(this).parent();
  var i = $(this);

  /*
  alert(d.width() + " - " + d.height() + " --> " + d.attr("w") + " - " + d.attr("h"));
  $(d).width(d.attr("w"));d.height(d.attr("h"));
  alert(d.width() + " - " + d.height());
  */

  var w = d.attr("w");
  var h = d.attr("h");

  var rd = w/h;
  var ri = $(this).width() / $(this).height();

  //alert(rd + " : " + ri);

  if (rd>=ri) {
  	//i.height(i.width()* (ri/rd)); 
  	i.height(h); 
  	}
  if (rd<ri) {
  	//i.width(i.height()* (rd/ri)); 
  	i.width(w);
  	}

	d.width(w);
	d.height(h);

  });
});
</script>
</head>
<body>

<div class="divImg" style="border:1px solid silver" w=600 h=200>
<img src="http://indianahumanities.net/wp-content/uploads/2011/08/cat2.jpg">
</div>

<div class="divImg" style="border:1px solid silver" w=100 h=100>
<img src="http://indianahumanities.net/wp-content/uploads/2011/08/cat2.jpg">
</div>

<div class="divImg" style="border:1px solid silver" w=200 h=300>
<img src="http://indianahumanities.net/wp-content/uploads/2011/08/cat2.jpg">
</div>

</body>
</html>

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Accepted Solution

by:
HainKurt earned 250 total points
ID: 36590396
you add  w & h attributes to div, leave image as is then jQuery scales image to fit into that div and sets divs width & height (maybe we can just use style="width:xxx; height:yyy" on div element and use

  var w = d.attr("w");
  var h = d.attr("h");
-->
  var w = d.width();
  var h = d.height();

result should be same...
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Author Closing Comment

by:knowlton
ID: 36590462
thx
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